Chemistry High School

please help for a brainlist

Answers

Answer 1

Answer:

Is D

Explanation:

hope this is helpful

Related Questions

What mass will 33.6 L of chlorine gas (Cl2) have at STP?

A.) 35 g
B.) 53 g
C.) 71 g
D.) 106 g

Answers

I think it's should be the answer: D

Rock candy is composed of large sugar crystals, which are made of sugar molecules. Growing the crystals in water with food dyes makes colored crystals. A friend has a plan to make jewelry using rock candy and claims that the jewelry will look like and last as long as jewelry made from gemstones. Use evidence about the bonding in ionic and molecular compounds to evaluate this claim.

Answers

It is possible to form jewelry from rock candy that will look like and last as long as jewelry made from gemstones since the both materials contains a crystalline lattice.

Ionic bonding comprises of units cells of oppositely charged ions that come together to form a crystal lattice. Molecular compounds such as gemstones are also composed of unit cells which also give a well defined crystal lattice.

We must note that the strength of these materials come from the fact that all have a well defined crystal lattice in which particles are well ordered. It is possible to form jewelry from rock candy that will look like and last as long as jewelry made from gemstones since the both materials contains a crystalline lattice.

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What types of bonds, and how many bonds, do you predict arsenic form with other elements?

Answers

Answer:

The outer-shell similarity of the two elements suggests that arsenic, like phosphorus, can form three covalent bonds per atom, with an additional lone pair of electrons left unbonded.

Atomic number: 96

Oxidation states: +3, +4

Arsenic atom can form either three or five bonds in arsenic compounds.

The number of bonds that an element will form to other elements depends on the number of electrons on the valence shell of that element. Arsenic has five valence electrons on its valence shell.

We know that there is one lone pair on the valence shell of arsenic hence, the arsenic atom can form either three or five bonds in arsenic compounds.

In conclusion, arsenic is an element that could form three or five bonds in its compounds.

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What makes a charged object attract an uncharged object?

A. The charge in both objects move around.
B. The charged object is positively charged.
C The charges move in the uncharged object.
D The uncharged object becomes negatively charged

Answers

Answer:

Explanation:

When we put a charged object near an uncharged object, it produces opposite charges in the near end of the uncharged object by electric induction. ... If we bring it near an uncharged sphere, the sphere forms negative charge near the glass rod, and positive charged on the end away from glass rod

If you tum out all of the lights in a room and shine a green flashlight on to a red apple, what color will you see?

Answers

Answer:

black

Explanation:

In white light, a red apple absorbs all the colors (including green) of the spectrum except red, which it reflects.

A green filter absorbs all the colors of the spectrum except green, which is transmitted through the filter (and comes through as green light).

When the green light shines on a red apple, the red apple absorbs the green light.

Since there is no red light shining on the apple, there is no red light to reflect, so the apple appears black.

Hope this helps!

When white light falls on an object the body absorbs all colors of light and reflects some colors of light which we see the object to be. For eg. A red ball reflects red color and absorbs the rest colors.So,if I throw green light on a red ball the ball will absorb that green light.

Which of the following shows a valid combustion reaction?

Answers

Answer:

May be third one because of the formation of H2(hydrogen)on the product side.

The equation that shows the valued combustion reaction is [tex]C_2H_4 + 3O_2 \rightarrow 2CO_2 + 2H_2O[/tex]

The following information should be considered:

For [tex]2Al + 2O_2 \rightarrow 2AlO + O_2[/tex] it should not Balanced Properly [tex]2Al + O_2 = 2AlO[/tex] For [tex]2CH_4 + O_2 \rightarrow 2CO + 4H_2[/tex] as CO should be [tex]CO_2[/tex] For [tex]Ca + O_2 \rightarrow CaOH[/tex] it should Not Balanced and No source for the H.

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which choice is an element? Air, oxygen, water, or sodium cholride

Answers

Answer:

Oxygen is an element.

Explanation:

Out of the choices listed, oxygen is the only element. The other choices are incorrect because air is a mixture of nitrogen, oxygen, carbon dioxide, water vapors, and some other gases; water is a compound of hydrogen and oxygen; and sodium chloride is a compound of sodium and chloride ions; meanwhile, oxygen is a pure element.

what happens when phosphorus forms an ion?

Answers

Answer:

Phosphorus would form a -3 charge

Explanation:

Phosphorus has five outer electrons that can bind atoms. As a result, Phosphorus forms a ion has a charge of -3.

In the chloroplast, energy in sunlight is passed around different chlorophyll molecules until it reaches a specific chlorophyll molecule that can transfer energy in sunlight to an energized electron. This chlorophyll molecule is called the accessory pigment. electron-carrier molecule. nucleus. photoelectric point. reaction center.

Answers

Answer:In the chloroplast, energy in sunlight is passed around different chlorophyll molecules until it reaches a specific chlorophyll molecule

Explanation:

Answer: In the chloroplast, energy in sunlight is passed around different chlorophyll molecules until it reaches a specific chlorophyll molecule

(Total for Question 3-5 marks)
Q4. Carbon monoxide and hydrogen are used in the manufacture of methanol (CH3OH)
The reaction is reversible and can reach a position of dynamic equilibrium.
CO(g) + 2H, (g) = CH OHg) AH = -91 kJ/mol
The reaction is carried out at a pressure of about 100 atmospheres and a temperature of 250°C.
(a) State two features of a reaction that is in dynamic equilibrium.
1
2
Page 9 of 11

Answers

Answer:

1. Forward and Backward reaction rate are equal

2. Concentration of reactants and products are the same.

What will the final temperature of the a block of brass with a mass of 30.6 g is at 87.4°C
after it's added to 62.3 g of water at 28.3°C. The specific heat of aluminum is 0.380
J/gºC.

Answers

The final temperature of the block of brass with a mass of 30.6 g at 87.4°C is 30.82°C.

SPECIFIC HEAT CAPACITY:

The amount of heat absorbed or released by a substance can be calculated using the following formula:

Q = m × c × ∆T

Q(water) = - Q(metal)

(m × c × ∆T) water = - (m × c × ∆T) metal

According to this question;

METAL:

m = 30.6gc = 0.380 J/g°C∆T = T - 87.4°C

WATER:

m = 62.3gc = 4.184J/g°C∆T = T - 28.3°C

62.3 × 4.184 × (T - 28.3) = - {30.6 × 0.380 × (T - 87.4)}

260.7T - 7376.8 = - {11.63T - 1016.3}

260.7T - 7376.8 = -11.63T + 1016.3

260.7T + 11.63T = 1016.3 + 7376.8

272.33T = 8393.1

T = 8393.1 ÷ 272.33

T = 30.82°C

Therefore, the final temperature of the block of brass with a mass of 30.6 g at 87.4°C is 30.82°C.

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what is the maximum wavelength of light that can ionize hydrogen in its ground state?

Answers

Answer: 123×10−7m.

Explanation:

An increase in which property would cause an electromagnetic wave's energy
to increase?
A. Wavelength
B. Mass
C. Frequency
D. Speed
SUBMIT

Answers

C. Answer correct I think…

rutherford and JJ thompson both contributed to what we know about the structure of the atom. What experiments did they perform and how did it change what we know about the structure of the atom? Furthermore describe the structure of an atom using only two words

Answers

Answer:

J.J. Thomson's experiments with cathode-ray tubes showed that all atoms contain tiny negatively charged subatomic particles or electrons. Rutherford's gold foil experiment showed that the atom is mostly empty space with a tiny, dense, positively-charged nucleus. I would describe the structure of an atom as the plum pudding model.

What's the Matter?
Which statements correctly describe matter? Select all that apply.
A. Matter is made up of atoms.
B. Matter is a measure of the amount of material in an object.
C. Matter may exist as a solid, liquid, or gas.
D. Matter forms when particles chemically bond together.
E. Matter includes both elements and compounds.

Answers

The answer is C for matter is made up of atoms that can turn into those three stages

Answer:

Matter is anything that takes up space and has mass. Mass is the stu that matter is made of, or the amount of particles in a substance or object. Matter has physical and chemical properties and can undergo physical and chemical changes

C. Matter may exist as a solid, liquid, or gas.

Explanation:

Find the pOH for the following:

A 1.34 x 10^-4 M solution of hydrochloric acid.

A) 10.13

B) 3.87

C) 4

D) 10

Answers

Answer:

A) 10.13 is the answer

Explanation:

Since HCl is a strong acid, its pH can be found by simply plugging it into the equation:

pH = -log[H+]

*H+ is just the concentration you were given*

Now that you have the pH, you just subtract it from 14 to find the pOH

I have attatched my work below. Hope this helps! :^)

To find the pOH of a solution, you can use the formula: pOH = -log10[OH-]

What is pOH?

pOH is a measure of the concentration of hydroxide ions (OH-) in a solution. It is the negative logarithm (base 10) of the hydroxide ion concentration.

In this case, since we have hydrochloric acid (HCl), we need to consider the concentration of hydroxide ions (OH-) produced when HCl dissociates in water.

HCl is a strong acid and completely dissociates, meaning it produces an equal concentration of hydrogen ions (H+) and chloride ions (Cl-) in water. Since there are no hydroxide ions produced, the concentration of hydroxide ions is 0.

Therefore, the pOH of a hydrochloric acid solution is 0, and none of the options provided (A, B, C, D) is the correct answer.

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Can anyone help meee

calculate the solubility product for the following solutions:
a) a saturated solution of cadmium sulfide, CdS (solubility = 1.46 • 10 ^ -11 mol / l
b) a saturated solution of calcium fluoride, CaF2, containing 0.0168g / l CaF2

Answers

Answer:

what is total amount of saturated solution

- Explain the relationship between electronic structure and the chemical
properties of an element.

Answers

Answer: There is a relationship between the electron configuration of an element and its resulting chemical/physical properties. Atoms of an element like to have a full octet of electrons in their valence shells. ... Other elements need to lose or gain electrons to obtain an octet.

Convert –26 degree Celsius temperature into kelvin .

Answers

Just add 273 to turn it into Kelvin

How many molecules are in 0.79 moles of NH4?

Answers

Answer:

Explanation:

how many valence electrons are there in an argon atom?

Answers

Answer:

There are 8 valence electrons in an argon atom.

A car travels 76 km/hr for 11 hours. How far did the car travel in this time period (in kilometers)?

Answers

Answer:

836 km

Explanation:

76*11=836

Answer:

836km

Explanation:

76km/hr = 76×1000÷3600= 190/9 m/s

11hours =39600 s

Distance=speed×time

Distance=190/9 × 39600= 836,000m

So distance is 836,000m or 836 km.

This method is possible only if body is moving linearly and the velocity is constant.

If there is uniform acceleration use Newton's laws of motion.

If is acceleration is varying then use calculus methods.

Which of the following elements is the smallest?
A. Strontium (Sr)
B. Beryllium (Be)
C. Calcium (Ca)
D. Magnesium (Mg)

Answers

The answer is Beryllium (Be)

for which elements are outer electrons and valence electrons the same?

Answers

Answer:

The number of electrons in the outermost shell of a particular atom determines its reactivity, or tendency to form chemical bonds with other atoms. This outermost shell is known as the valence shell, and the electrons found in it are called valence electrons.

Explanation:

Elements of same group have same number of valence electrons and similar physical and chemical properties.

What are groups in periodic table ?

A periodic table is classified into different columns and rows. The vertical columns in the table are called groups and the horizontal rows are called periods.

From left to right, the atomic number of elements increases by one and atomic size increases. Down a group, the number of electrons and atomic size as well increases.

Elements of same groups have same number of outer electrons or valence electrons. They show similarities in chemical and physical properties.

For example, lithium and sodium are in the first group. They both have one valence electron.

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are diamonds and graphite made from the same element

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Answer:

Graphite and diamond are two of the most interesting minerals. They are identical chemically – both are composed of carbon (C), but physically, they are very different. Minerals that have the same chemistry but different crystal structures are called polymorphs.

Short definition of inclined plane

Answers

what is an inclined plane?

an inclined plane is a surface that is at an angle against a horizontal surface. one of the simple machines; a slopping surface such as ramp, such that an object can be raised with less effort than being lifted vertically.

hope it helps:) and mark me as brainliest please:)

Answer:

inclined plane, a simple machine consisting of a sloping surface, used for raising heavy bodies. The force required to move an object up the incline is less than the weight being raised, discounting friction

Explanation:

The steeper the slope, or incline, the more nearly the required force approaches the actual weight. The steeper the slope, or incline, the more nearly the required force approaches the actual weight.

Are crystals of different soluble solids similar?

Answers

Crystals of different soluble solids are not similar because they are amorphous and therefore do not have definite crystals.

What are crystal solids?

A crystalline solid is a homogeneous solid in which the constituent particles, atoms, ions or molecules are arranged in a definite repeating pattern.

Most of the solid substances are crystalline in nature. The arrangement of particles in a crystalline solid is such that the total intermolecular force of attraction is at maximum.

Factors in which solubility depends are temperature, pH, and ionic strength.

Crystals of different soluble solids are not similar as they do not have definite crystals.

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HELP PLEASE GIVING OUT BRAINLIEST AND A LOT OF POINTS!!

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The sun!! It’s the sun lovely! Don’t worry!

HELP ITS TIMED!!!
Refer to the pic

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Answer:

Explanation:

We have to cancel out the electrons so multipy ionic reaction of Ag by 3 and add it to ionic reaction of Al.

True or false? Simple molecular substances contain delocalised electrons.

Answers

Answer:false

Explanation:

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