The amount of nitrogen in moles (n) is [n=166.8.028.0] = 5.95714286 moles. every mole of CH4 is consumed results in the production of one mole of CO2. In 100 g of water, there are about eleven moles of hydrogen atoms.
when 100 moles of water are present?Under a consistent pressure of 1 atm, a mole of water heated to 100°C turns into steam. [Heat of vaporisation liquid water at 100°C= 540cal/gm] is the change in entropy.
How many mole of CH4 must be burned in order to produce 44g of CO2?Since 1 mole or methane can completely burn to make 1 mole of carbon dioxide, we may say that mole ratio of methane can fully burn to produce 44 grammes of carbon dioxide.
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Balance the chemical reaction
using an atom inventory.
What is the correct whole
number coefficient for iron(III)
bromide?
[?] FeBr3+ [ ]Na₂S →
]Fe₂S3 + [ ]NaBr
Please help!!
Answer:
Explanation:Balance equation:
2 FeBr3 + 3 Na2S → Fe2S3 + 6 NaBr
When 10grams of Chlorine reacts with mercury under varying conditions, the reaction consumes either 28,3grams or 56,6grams of mercury. No other combinations occur. Explain these observation in terms of the Law of Multiple proportions.
The observation that only 28.3 grams or 56.6 grams of mercury are consumed in the reactions is consistent with the Law of Multiple Proportions, which predicts that the masses of the elements that combine are in small whole number ratios.
According to the Law of Multiple Proportions, when two elements form more than one compound, the masses of one element that combine with a fixed mass of the other element are in the ratio of small whole numbers.
In this case, chlorine is reacting with mercury to form different compounds, and the masses of mercury consumed in the two reactions are in the ratio of 1:2, which is a small whole number ratio.
If we assume that the fixed amount of chlorine used in both reactions is 10 grams, then we can calculate the expected mass of mercury consumed based on the law of multiple proportions.
If the first reaction consumes 28.3 grams of mercury, then the ratio of mercury to chlorine is 2.83:1. If the second reaction consumes 56.6 grams of mercury, then the ratio of mercury to chlorine is 5.66:1.
We can see that the ratios of mercury to chlorine in the two reactions are in the ratio of 2:1, which is a small whole number ratio, consistent with the Law of Multiple Proportions.
This suggests that chlorine is reacting with mercury to form two different compounds with a fixed ratio of chlorine to mercury, and that the mass ratios of the compounds are related by small whole numbers.
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if a gas displays a solubility of 0.00290m at a partial pressure of 125 kpa, what is the proportionality constant for this gas in this solvent and at this temperature? your answer should have three significant figures.
The proportionality constant for this gas in this solvent and at this temperature is approximately 0.0000233 M/kPa.
To find the proportionality constant for the gas in the solvent and at the given temperature, we need to use Henry's Law, which states that the solubility of a gas in a liquid is directly proportional to the partial pressure of the gas above the liquid. Mathematically, it is expressed as:
C = k * P
where C is the solubility of the gas (in this case, 0.00290 M), P is the partial pressure of the gas (125 kPa), and k is the proportionality constant that we need to find.
To find the value of k, we can rearrange the equation:
k = C / P
Now, plug in the given values for C and P:
k = 0.00290 M / 125 kPa
Next, divide the solubility by the partial pressure to find the proportionality constant:
k ≈ 0.0000232 M/kPa
Finally, to express the answer with three significant figures, round the value:
k ≈ 0.0000233 M/kPa
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100.0ml solution of 0.30m cu(no3)2 is mixed with 100.0ml of 6.0 m ammonia solution what is cu in the resulting mixture
100.0ml solution of 0.30m cu(no3)2 is mixed with 100.0ml of 6.0 m ammonia solution, the concentration cu in the resulting mixture is: 0.15 M.
To find the concentration of Cu in the resulting mixture, follow these steps:
1. Calculate the moles of Cu(NO3)2 in the initial solution: moles = Molarity × Volume
moles of Cu(NO3)2 = 0.30 M × 0.100 L = 0.030 mol
2. Determine the moles of Cu in the Cu(NO3)2 solution (1:1 ratio between Cu and Cu(NO3)2)
moles of Cu = 0.030 mol
3. Calculate the total volume of the resulting mixture:
Total volume = Volume of Cu(NO3)2 solution + Volume of ammonia solution
Total volume = 0.100 L + 0.100 L = 0.200 L
4. Calculate the new concentration of Cu in the resulting mixture: Molarity = moles / Volume
Molarity of Cu = 0.030 mol / 0.200 L = 0.15 M
So, the concentration of Cu in the resulting mixture is 0.15 M.
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Question
How many moles of HCI would be dissolved in
1.0 L of a 0.74 M solution of HCI?
The amount of moles is therefore 0.23 mol 0.23 m o l.
molarity x number of litres = 0.2 x (75/1000) = 0.015 mol.
In 1 L of solution, how many moles are dissolved?Molarity (M) is the most often used unit of solution concentration and is defined as the amount of solute in moles divided by the volume of solution in litres: M is the mole of solute per litre of solution. A 1.00 molar solution (written 1.00 M) contains 1.00 mole of solute per litre of solution.
The hydrochloric acid solution has a molarity of 3 M. This indicates that 1 L of solution contains exactly 3 moles of HCl. Our sample has a capacity of 50 mL.
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in the synthesis of meso-hydrobenzoin that you carried out, what initial expected observation would you not observe had all the nabh4 you added to the reaction mixture decomposed prior to reacting with benzil?
When carrying out the synthesis of meso-hydrobenzoin, the initially expected observation that would not be observed had all the NaBH₄ added to the reaction mixture decomposed before reacting with benzil is a reduction in the solution volume.
What is the Synthesis of Meso-Hydrobenzoin, The synthesis of meso-hydrobenzoin involves the reduction of benzil using NaBH₄, which produces hydrobenzoin. In order to obtain meso-hydrobenzoin, hydrobenzoin must be dissolved in hot ethanol, followed by adding a seed crystal.
This mixture is allowed to cool, causing the formation of meso-hydrobenzoin crystals. Initially, if all of the NaBH₄ added to the reaction mixture decomposed before reacting with benzil, there would be no observable reduction in the volume of the solution. This is because the reduction of benzil using NaBH₄ is an exothermic reaction that produces hydrogen gas. As a result, the volume of the solution would decrease over time.
Therefore, if there was no reduction in the solution volume, it would be an indication that the NaBH₄ did not react with the benzil.
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a 5.00 ml sample of vinegar contains 0.2568 g of acetic acid. if the density of vinegar is 1.00 g/ml, calculate the % acetic acid by mass. your answer: question 3 options: answer
The % acetic acid by mass in the vinegar sample is 5.14%.
The first step is to calculate the mass of the vinegar sample using its density:
Mass of vinegar = Volume of vinegar x Density of vinegar
Mass of vinegar = 5.00 ml x 1.00 g/ml = 5.00 g
Next, we can use the mass of acetic acid in the sample to calculate the percentage of acetic acid by mass:
% Acetic Acid = (Mass of acetic acid / Mass of vinegar) x 100%
% Acetic Acid = (0.2568 g / 5.00 g) x 100%
% Acetic Acid = 5.14%
To solve the problem, we first need to know the mass of the vinegar sample. We are given its volume and density, so we can use the density formula (density = mass / volume) to calculate the mass. Once we have the mass of the vinegar, we can use the mass of acetic acid in the sample (also given) to calculate the percentage of acetic acid by mass using the formula % Acetic Acid = (Mass of acetic acid / Mass of vinegar) x 100%.
This formula calculates the proportion of the mass of the sample that is due to acetic acid. Finally, we multiply the result by 100% to express the answer as a percentage. Therefore, the percentage of acetic acid by mass is 5.14%.
The complete question is
A 5.00 ml sample of vinegar contains 0.2568 g of acetic acid. if the density of vinegar is 1.00 g/ml, calculate the % acetic acid by mass.
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what will happen if 50.00 ml of 2.0x10-4 m pb(no3)2 is mixed with 50.00 ml of 2.0x10-4 m nh4f? ksp for pbbr2 is 4.0x10-5
Since Q < Ksp (4.0x10-5), PbF2 will not precipitate out of solution. The solution will contain Pb2+, F-, NH4+, and NO3- ions in equilibrium.
When lead nitrate (Pb(NO3)2) and ammonium fluoride (NH4F) are mixed, they will react to form lead fluoride (PbF2) and ammonium nitrate (NH4NO3) according to the following balanced chemical equation:
Pb(NO3)2 + 2 NH4F → PbF2 + 2 NH4NO3
To determine whether or not PbF2 will precipitate out of solution, we need to calculate the ion product (Q) and compare it to the solubility product constant (Ksp) for PbF2. The ion product is calculated by multiplying the concentrations of the lead ion (Pb2+) and the fluoride ion (F-) in solution.
First, we need to calculate the concentration of Pb2+ and F- in solution after the reaction has occurred. Since the initial concentrations of Pb(NO3)2 and NH4F are both 2.0x10-4 M, the total volume of the solution is 100.00 mL. Therefore, the concentration of Pb2+ and F- after the reaction will be:
[Pb2+] = (50.00 mL / 100.00 mL) × 2.0x10-4 M = 1.0x10-4 M
[F-] = (50.00 mL / 100.00 mL) × 2.0x10-4 M = 1.0x10-4 M
Now we can calculate the ion product:
Q = [Pb2+][F-] = (1.0x10-4 M)(1.0x10-4 M) = 1.0x10-8
Since Q < Ksp (4.0x10-5), PbF2 will not precipitate out of solution. The solution will contain Pb2+, F-, NH4+, and NO3- ions in equilibrium.
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Which of the following is most likely to produce a loud echo? Explain your answer. (Use science terminology)
A) talking in a furnished, carpeted room
B) singing in a tiled shower
C) yelling across an open field
[tex] \: [/tex]
Option B, singing in a tiled shower, is most likely to produce a loud echo. This is because sound waves reflect more easily off hard and smooth surfaces, which are found in a tiled shower. This means that sound waves will bounce back and forth between the walls, floor, and ceiling of the shower, creating a series of reflections that can produce a perceptible echo. In comparison, a furnished, carpeted room (option A) would have more sound-absorbing materials, such as furniture and carpet, which would dampen the sound waves and reduce the likelihood of an echo. Option C, yelling across an open field, would also not produce a loud echo, as it requires a reflective surface to bounce off of. In an open field, there are no nearby surfaces for the sound waves to reflect off of, so they will simply dissipate into the air.
How many atoms are in 2 H2SO4?
Answer:
14
Explanation:
There are 14 atoms in 2H2SO4. Given - Chemical formula. Solution - The atom and number of atoms are - 2*2 Hydrogen + 1*2 Sulphur + 4*2 Oxygen.Aug 11, 2020
g an element conducts electricity to some extent and tends to form molecular compounds. which is the most likely identity of the element?
The element that conducts electricity to some extent and tends to form molecular compounds is most likely a nonmetal
Nonmetals have high electronegativity and tend to gain or share electrons to form molecular compounds. Some examples of nonmetals include hydrogen, carbon, nitrogen, oxygen, fluorine, and chlorine. However, some nonmetals such as carbon and graphite can conduct electricity to some extent, making them useful in electronic devices.
Non-metals can be classified as insulators or semiconductors when it comes to electricity. Insulators are materials that do not conduct electricity well, while semiconductors are materials that conduct electricity better than insulators, but not as well as conductors.
Examples of non-metal insulators include rubber, glass, and plastic. These materials have high resistance to the flow of electric current and are used as electrical insulation in wiring and electronic components.
Semiconductor non-metals include materials such as silicon, germanium, and carbon. They have electrical conductivity that is intermediate between that of a conductor and an insulator. These materials are used in electronic devices such as transistors, integrated circuits, and solar cells
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suppose a metal oxide of formula m2o were soluble in water. what would be the major product or products of dissolving the substance in water?
The meta oxides when dissolved in water they gives us there ions as the major products of the dissolving substance.
When M₂O is mixed with water, it dissociates into ions because it is water soluble.
M2O → 2M⁺ + O⁻
The process of dissolving a gaseous, liquid, or solid solute in a solvent to form a solution is called dissolution. The maximum concentration of a solute that can be dissolved in a solvent at a given temperature is called solubility. A solution is said to be saturated when it contains the maximum amount of solute.
Ionic compounds dissolve in water if the energy released when the ions interact with water molecules offsets the energy needed to break ionic bonds in the solid and separate the water molecules, so that the ions can be dissolved.
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substance a has molecules that attract with london dispersion attraction, and substance b has molecules that attract with dipole-dipole attraction. which one will have the higher boiling point?
The substance B will have a higher boiling point.
When we talk about substances, they have different physical and chemical properties, such as melting point, boiling point, density, etc. These properties depend on different factors such as intermolecular forces, molecular mass, etc. The given question is asking about the boiling point of two different substances, one that has molecules that attract with London Dispersion attraction and the other with Dipole-Dipole attraction.
London Dispersion Attraction: London Dispersion force is a temporary attractive force that occurs between the atoms or molecules of nonpolar compounds. It is a type of Van der Waals force that arises due to instantaneous dipoles that arise in the electron clouds of the molecules. These forces are very weak and short-range.
Dipole-Dipole Attraction: Dipole-dipole attraction is an attractive force that occurs between the oppositely charged ends of polar molecules. This force is stronger than London dispersion forces because it involves two dipoles, and it is a long-range force.Now, to answer the question, we need to see which of these forces is stronger. We know that London Dispersion forces are weaker than Dipole-Dipole forces.
Therefore, substance B, which has molecules that attract with Dipole-Dipole attraction, will have a higher boiling point than substance A, which has molecules that attract with London Dispersion attraction. Thus, the boiling point of a substance depends on the type of intermolecular force it has.
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what is the carbon concentration of an iron–carbon alloy for which the fraction of total ferrite is 0.94 at the temperature of about 700℃ (at which the field extends to 0.022 wt% c)?
The carbon concentration of an iron–carbon alloy for which the fraction of total ferrite is 0.94 at the temperature of about 700℃ (at which the field extends to 0.022 wt% c) is 0.06 wt% c.
An iron-carbon alloy is an alloy of iron and carbon that is commonly used in the manufacture of industrial goods. Steel, wrought iron, and cast iron are all examples of iron-carbon alloys. Iron-carbon alloys' properties are determined by their carbon content. Carbon content in the alloys may range from 0.008 to 2.14 percent by weight.
The amount of carbon in an iron-carbon alloy is referred to as its carbon concentration. When the iron-carbon alloy is melted or worked, carbon is added to it, and the carbon concentration is calculated by dividing the amount of carbon by the alloy's weight.
Therefore, the carbon concentration of an iron–carbon alloy for which the fraction of total ferrite is 0.94 at the temperature of about 700℃ (at which the field extends to 0.022 wt% c) is 0.06 wt% c.
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if the molar enthalpy of solution for calcium carbonate is -25.3 kj/mol, what mass of calcium carbonate would you need to have the same effect on the temperature of water as the 5g of calcium chloride
You would need 4.504g of calcium carbonate to have the same effect on the temperature of the water as 5g of calcium chloride.
To determine the mass of calcium carbonate needed to have the same effect on the temperature of the water as 5g of calcium chloride, we'll follow these steps:
1. Calculate the moles of calcium chloride.
2. Determine the energy change caused by 5g of calcium chloride.
3. Calculate the moles of calcium carbonate needed to cause the same energy change.
4. Determine the mass of calcium carbonate.
Step 1: Calculate the moles of calcium chloride.
Moles = mass / molar mass
The molar mass of calcium chloride (CaCl2) is 40.08 (Ca) + 2 * 35.45 (Cl) = 110.98 g/mol.
Moles of CaCl2 = 5g / 110.98 g/mol = 0.0450 mol
Step 2: Determine the energy change caused by 5g of calcium chloride.
Energy change = moles * molar enthalpy of solution
Energy change = 0.0450 mol * -25.3 kJ/mol = -1.1385 kJ
Step 3: Calculate the moles of calcium carbonate needed to cause the same energy change.
Moles of CaCO3 = Energy change / molar enthalpy of solution
Moles of CaCO3 = -1.1385 kJ / -25.3 kJ/mol = 0.0450 mol
Step 4: Determine the mass of calcium carbonate.
Mass = moles * molar mass
The molar mass of calcium carbonate (CaCO3) is 40.08 (Ca) + 12.01 (C) + 3 * 16.00 (O) = 100.09 g/mol.
Mass of CaCO3 = 0.0450 mol * 100.09 g/mol = 4.504 g
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arrange the following elements in order of increasing metallic character: fr, sn, in, ba, se. note: 1 = most ; 6 = least ba 2 se 5 fr 1 in
The correct order is: Fr 1, Ba 2, In 3, Sn 4, Se 5
To arrange the following elements in order of increasing metallic character (1 = most, 6 = least): Fr, Sn, In, Ba, Se, you should consider their positions in the periodic table. As you move down a group, metallic character increases; as you move left across a period, metallic character also increases.
Step 1: Locate the elements in the periodic table:
Fr (Francium): Group 1, Period 7
Sn (Tin): Group 14, Period 5
In (Indium): Group 13, Period 5
Ba (Barium): Group 2, Period 6
Se (Selenium): Group 16, Period 4
Step 2: Order the elements according to the trends in metallic character:
1. Fr (most metallic character)
2. Ba
3. In
4. Sn
5. Se (least metallic character)
So the correct order is: Fr 1, Ba 2, In 3, Sn 4, Se 5.
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There are several ways to optimize metal extraction. Which way also optimizes environmental impact? (1 point)
O using enormous trucks to carry larger loads
O sifting ore at the site before transporting
O crushing only the best quality ore
O dumping waste rock near the plant
C. "Sifting ore at the site before transporting" is the way that optimizes environmental impact.
This method can help to reduce the amount of waste material that needs to be transported and processed, which in turn reduces the environmental impact associated with mining operations, such as land degradation, soil erosion, and water pollution. By removing unwanted materials from the ore at the site, the amount of waste material generated can be reduced, which can also save energy and lower greenhouse gas emissions associated with transportation and processing.
What is an ore?
An ore is a naturally occurring mineral or rock that contains a valuable substance that can be extracted at a profit. Ores typically contain metals, such as copper, iron, gold, silver, and aluminum, or non-metallic minerals, such as phosphate, limestone, and sulfur.
The valuable substance in an ore is usually present in relatively high concentrations compared to other minerals in the rock or mineral deposit, and can be extracted through mining and processing using various methods, such as smelting, leaching, and refining. The identification and extraction of ores have been a vital part of human civilization for thousands of years, and the discovery of new ores and improved extraction methods have played an important role in shaping the development of technology, industry, and society.
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Complete question is: C. "Sifting ore at the site before transporting" is the way that optimizes environmental impact.
According to the law of entropy, when hot and cold objects meet, heat flows from hotter to colder. What would be the end result of mixing hot water and cold water?
Responses
A.The molecules in the cold water would slow down.The molecules in the cold water would slow down.
B.The cold water would continue to heat up.The cold water would continue to heat up.
C.All the water would reach an equilibrium temperature and heat would stop flowing.All the water would reach an equilibrium temperature and heat would stop flowing.
D.The two volumes of water would balance out but the temperature of the two would keep fluctuating.The two volumes of water would balance out but the temperature of the two would keep fluctuating.
E.The warm water would continue to cool down.
C. All the water would reach an equilibrium temperature and heat would stop flowing.
When hot and cold water are mixed together, heat flows from hotter to colder until both reach a common temperature. This is because the molecules in the hotter water have more kinetic energy than those in the colder water, and so they transfer some of their energy to the colder water until both have the same amount of energy. Eventually, all the water in the mixture will reach the same temperature, and heat transfer will stop. Therefore, the end result of mixing hot and cold water would be that all the water would reach an equilibrium temperature and heat would stop flowing.
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g for elements in the periodic table, electronegativity increases from left to right and decreases from top to bottom.bond polarity increases with electronegativity difference between the atoms in the bond.which combination of elements will be most likely to form an ionic compound?
The combination of elements that will be most likely to form an ionic compound is one where there is a large difference in electronegativity between the two atoms. This is because ionic bonds are formed when there is a transfer of electrons from one atom to another, resulting in the formation of cations and anions.
In general, metal atoms tend to have low electronegativities, while nonmetal atoms tend to have high electronegativities. Therefore, a combination of a metal and a nonmetal is most likely to form an ionic compound.
For example, sodium (Na) is a metal with low electronegativity, while chlorine (Cl) is a non-metal with high electronegativity. When sodium and chlorine react, sodium donates its outer electron to chlorine, forming the ionic compound sodium chloride (NaCl).
Other examples of metal-nonmetal combinations that are likely to form ionic compounds include magnesium (Mg) and oxygen (O) (forming MgO), and aluminium (Al) and fluorine (F) (forming AlF3).
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identify the relationship in the following pair. do the drawings represent constitutional isomers or stereoisomers, or are they just different ways of drawing the same compound? if they are stereoisomers, are they enantiomers or diastereomers?
The following drawings depict enantiomers or diastereomers:
A Diastereomers
B. Enantiomers
C. Diastereomers
D. Diastereomers
E. Enantiomers
F. Diastereomers
G. Enantiomers
H. Diastereomers
I. Enantiomers
J. Enantiomers
Enantiomers and diastereomers are two types of stereoisomers, which are molecules that have the same molecular formula and connectivity but differ in their three-dimensional arrangement of atoms in space. Enantiomers are mirror images of each other and cannot be superimposed on each other, like a left and right hand. They have identical physical and chemical properties, except for the way they interact with polarized light.
Enantiomers rotate plane-polarized light in opposite directions and are therefore called optical isomers. Diastereomers, on the other hand, are stereoisomers that are not mirror images of each other and can be distinguished by their physical and chemical properties. Unlike enantiomers, diastereomers do not rotate plane-polarized light in opposite directions. They have different melting and boiling points, solubilities, and reactivities.
The complete question
Identify the relationship in each of the following pairs. Do the drawings(image attached) represent constitutional isomers or stereoisomers, or are they just different ways of drawing the same compound? If they are stereoisomers, are they enantiomers or diastereomers?
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how will increasing the surface area of one or more reactants affect the reaction rate of a system? responses
Increasing the surface area of one or more reactants generally increases the reaction rate of a system. This is because the rate of a chemical reaction is dependent on the frequency of successful collisions between reactant particles, which is in turn dependent on the surface area available for those collisions to occur.
When the surface area of a reactant is increased, the number of reactive sites available for collisions with other particles also increases. This results in a greater number of successful collisions and a higher reaction rate.
For example, consider the reaction of a solid metal with a gaseous reactant. If the metal is initially in the form of a solid block, the surface area available for reaction is limited to the exposed surface area of the block.
However, if the metal is ground into a powder, the surface area available for reaction increases significantly, allowing for a much greater number of successful collisions and a higher reaction rate.
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--The given question is incorrect, the correct question is
"How will increasing the surface area of one or more reactants affect the reaction rate of a system?"--
graphite is made up of layers of graphene. each layer of graphene is about 200 picometers, or meters, thick. how many layers of graphene are there in a 1.6-mm-thick piece of graphite? express your answer in scientific notation.
As a result, a 1.6-mm-thick slice of graphite has 8 106 layers of graphene. The solution is 8.0 1006. We can use unit conversions to solve this problem.
1 picometer (pm) = 1 × 10^-12 meters (m)
Therefore, 200 picometers (200 pm) = 200 × 10^-12 meters (m)
To find the number of layers of graphene in a 1.6-mm-thick piece of graphite, we need to divide the thickness of the graphite by the thickness of one layer of graphene:
1.6 mm = 1.6 × 10^-3 meters (m)
Number of layers of graphene = thickness of graphite / thickness of one layer of graphene
= (1.6 × 10^-3 m) / (200 × 10^-12 m)
= 8 × 10^6
Therefore, there are 8 × 10^6 layers of graphene in a 1.6-mm-thick piece of graphite. Expressed in scientific notation, the answer is 8.0 × 10^6.
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in the muscovite crystal, it was determined from potassium-40 and argon-40 that 2.2 half-lives had passed. what is the age of the muscovite crystal in billions of years(rounded to one decimal place)?
The age of the muscovite crystal is 0.86 billion years.
We can use the half-life formula to determine the age of the muscovite crystal. The half-life formula is given as:
N = N₀ (1/2)^t/T
Where N is the remaining quantity of a substance, N₀ is the original quantity, t is the time that has passed, and T is the half-life of the substance.
Substituting the given values, we get:
N/N₀ = (1/2)^(2.2)T (N₀/2^2.2) = N
The age of the muscovite crystal is given by t, which we can calculate using the following formula:
t = T * log (N₀/N)
Substituting the values of N₀ and N, we get:
t = 1.3 * 10^9 * log (1/2^2.2)t = 1.3 * 10^9 * log (1/4.59479342)
t = 1.3 * 10^9 * 0.662t = 860.6 million years
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which one of the following general characteristics is shared by all catalysts? a) they induce more collisions among reactant molecules. b) they transfer kinetic energy to the reactant molecules. c) they increase the reaction rate but do not change the keq of a reversible reaction.
When answering questions, a question-answering bot on the platform Brainly should always be factually accurate, professional, and friendly. It should be concise and should not provide extraneous amounts of detail. It should not ignore any typos or irrelevant parts of the question.What is a catalyst?A catalyst is a substance that increases the rate of a chemical reaction without undergoing any permanent chemical change itself. This means that the catalyst is neither consumed nor produced in the reaction. In other words, the catalyst does not participate in the reaction itself, but it speeds up the reaction. There are many different types of catalysts, including enzymes, metals, acids, and bases.Which one of the following general characteristics is shared by all catalysts?A catalyst increases the rate of a chemical reaction, but it does not change the key of a reversible reaction. Therefore, the correct answer is c) they increase the reaction rate but do not change the key of a reversible reaction.
All catalysts share the general characteristic (c): they increase the reaction rate but do not change the equilibrium of a reversible reaction. Catalysts work by providing an alternative reaction pathway with a lower activation energy, allowing reactant molecules to convert into products more easily. However, they do not affect the overall energy balance of the reaction or its reversibility.
a metal crystallizes with a face-centered cubic lattice. the edge of the unit cell is 434 pm. what is the diameter of the metal atom?
In a face-centered cubic (FCC) lattice, each unit cell contains atoms at each of its eight corners and one atom at the center of each of its six faces.
To calculate the diameter of the metal atom, we need to know the relationship between the edge length of the unit cell and the diameter of the atom. In an FCC lattice, the atoms are arranged in a close-packed arrangement, where the atoms touch along the face diagonal of the unit cell.
The face diagonal of an FCC unit cell can be calculated using the Pythagorean theorem:
face diagonal = sqrt(2) x edge length
Substituting the given value for the edge length of the unit cell:
face diagonal = sqrt(2) x 434 pm = 614 pm
The diameter of the metal atom is equal to the distance between the centers of two adjacent atoms along the face diagonal of the unit cell. In an FCC lattice, the atoms touch along the face diagonal, so the distance between the centers of two adjacent atoms is equal to the length of the face diagonal minus the diameter of the atom:
diameter of atom = face diagonal - atomic radius
where atomic radius is half of the diameter of the atom.
Rearranging this equation to solve for the diameter of the atom, we get:
diameter of atom = face diagonal - 2 x atomic radius
Substituting the given value for the face diagonal and solving for the atomic radius:
atomic radius = (face diagonal - diameter of atom)/2
diameter of atom = face diagonal - 2 x atomic radius
diameter of atom = 614 pm - 2 x atomic radius
We are given the edge length of the unit cell, but we need to find the diameter of the atom. Therefore, we need to rearrange the above equations to solve for the diameter of the atom:
atomic radius = edge length/2
diameter of atom = face diagonal - 2 x atomic radius
diameter of atom = 614 pm - 2 x (edge length/2)
diameter of atom = 614 pm - 2 x 434 pm
diameter of atom = 614 pm - 868 pm
diameter of atom = -254 pm (This answer is negative, which is not physically meaningful.)
Therefore, we cannot calculate the diameter of the metal atom with the given information. There might be some mistake in the calculation or the given value for the edge length of the unit cell.
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Which variable is accepted as constant when using the Gibbs free energy equation, ΔH − TΔS
energy
entropy
enthalpy
pressure
Pressure is accepted as constant when using the Gibbs free energy equation, ΔH − TΔS.
What is the Gibbs free energy equation?The Gibbs free energy equation is a thermodynamic equation used to determine whether a chemical reaction is spontaneous or non-spontaneous under certain conditions. The equation is:
ΔG = ΔH - TΔS
where:
ΔG is the variation in Gibbs free energy
ΔH is the change in enthalpy
T is the temperature in Kelvin
ΔS is the change in entropy
If ΔG is negative, the reaction is spontaneous (i.e., it will occur without an external input of energy). If ΔG is positive, the given reaction is not spontaneous, and thus it will not occur without an external input of energy. If ΔG is zero, then it means that the reaction is at equilibrium.
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-If the experimental (actual yield) is 17.0 grams what is the yield
If the theoretical yield is 20 grams and the actual yield is 17 grams, the percent yield would be 85%.
How are yields in grams calculated?To get the mass per mole, divide the reactant's mass by its molecular weight. As an alternative, we can multiply the millilitres of the reactant solution by the grams per millilitre of the liquid solution.
Once you have the theoretical yield, you can use the following formula to calculate the percent yield:
percent yield = (actual yield / theoretical yield) x 100%
For example, if the theoretical yield is 20 grams and the actual yield is 17 grams, the percent yield would be:
percent yield = (17 grams / 20 grams) x 100% = 85%
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early formations of the medium used a smaller amount of carbohydrates and occasionally false (pink/alkaline) results after 48 hours. this phenomenon is call a reversion. why do you think this happened, and what are two steps you could use to prevent this?
The phenomenon is called reversion. It is caused when the medium used has a lower amount of carbohydrates and occasionally produces false (pink/alkaline) results after 48 hours. Two steps that can be taken to prevent reversion are increase the amount of carbohydrates in the medium used and reducing the incubation period of the medium used,
The phenomenon known as reversion occurs when the test results turn out to be pink/alkaline despite the presence of lactose and glucose, indicating the absence of a positive reaction. This occurs as a result of glucose exhaustion after 24 hours, and lactose is then broken down into galactose and glucose, both of which may be utilised by the microorganisms.
As the microorganisms consume these sugars, the medium's pH rises, causing a shift from acid to alkaline. The pH increase results in the formation of an alkaline pH that turns the pH indicator pink, this phenomenon is referred to as reversion. The factors contributing to the phenomenon are a minimal amount of carbohydrates in the medium and reduced incubation time. Two steps that can be taken to prevent reversion are increase the amount of carbohydrates in the medium used and reducing the incubation period of the medium used.
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what will be the ph of a buffer solution containing an acid of pka8.1, with an acid concentration equivalent to that of its conjugate base?
The pH of the buffer solution will be 8.1. containing an acid of pka8.1, with an acid concentration equivalent to that of its conjugate base
The pH of a buffer solution can be determined using the Henderson-Hasselbalch equation, which is:
pH = pKa + log([A-]/[HA])
In this case, the buffer solution contains an acid with a pKa of 8.1 and has an acid concentration ([HA]) equal to the concentration of its conjugate base ([A-]). Therefore, the ratio [A-]/[HA] is equal to 1.
Now, let's plug in the values into the equation:
pH = 8.1 + log(1)
Since the log of 1 is 0, the equation simplifies to
pH = 8.1
So the pH of the buffer solution will be 8.1. This is because the acid and its conjugate base are present in equal concentrations, maintaining a balanced pH close to the pKa value of the acid. The buffer's ability to resist changes in pH comes from the presence of both the weak acid and its conjugate base, which can neutralize any added acids or bases and keep the pH stable.
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which of the following examples from the living world exhibit well-designed structures supporting well-designed functions? group of answer choices a squirrel stripping open a sun flower seed an otter breaking into a mussel shell with a pebble a molecule of the correct dimensions storing information an enzyme breaks a specific covalent bond to generate a specific molecular product. all of the above.
All of the examples listed could be considered to exhibit well-designed structures supporting well-designed functions, but the level at which they are designed may differ.
A squirrel's teeth and jaws are well-designed structures that allow them to strip open sunflower seeds, which is a well-designed function for obtaining food. Similarly, an otter's use of a pebble as a tool to break into a mussel shell is also an example of well-designed structures supporting well-designed functions.
A molecule of the correct dimensions storing information is an example of a well-designed structure at the molecular level that supports the well-designed function of storing genetic information. Likewise, enzymes are also well-designed structures that catalyze specific chemical reactions, and the breaking of a specific covalent bond to generate a specific molecular product is an example of a well-designed function.
Therefore, the correct answer is: all of the above.
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