Answer:
4Fe(s)+3O2(g) ----> 2Fe2O3(s)
MULTIPLE CHOICE
What is the molality (m) of 3.5 mol of sugar in 2.5 kg of water?
The molality of the solution is 1.4 moles per kilogram (molal).
The molality of the solution is equal to the number of moles of sugar (solute) divided by the number of kilograms of water (solvent). Hence, the molality is determined below:
[tex]m = \frac{3.5\,mol}{2.5\,kg}[/tex]
[tex]m = 1.4\,\frac{mol}{kg}[/tex]
The molality of the solution is 1.4 moles per kilogram (molal).
We kindly invite to check this question on molality: https://brainly.com/question/4580605
What was the effect of increasing the water's mass?
Vocabulary crossword puzzle properties of minerals
Answer:
? no image
Explanation:
Which solution has the greatest number of hydrogen ions? blood, pH = 7. 2 lemon juice, pH = 2 soda, pH = 3. 5 bleach, pH = 13. 5.
Answer:
pH=2 soda
Explanation:
There are more H+ ions in more acidic (lower on the pH scale) solutions. There are more H3O+ ions in more basic (higher on the pH scale) solutions.
Hope this helps!
Answer:
b. lemon juice pH=2
Explanation:
A chemical reaction resulting in the transfer of electrons or hydrogen atoms from one molecule to another is called a(n) _______ reaction.
Answer:
Explanation:
Oxidation reaction
The kind of reaction involving the transfer of electrons or hydrogen away from a molecule is called oxidation.
In the same vein, the molecule that receives the electron or the hydrogen atom is said to be reduced. This means that oxidation cannot exist in isolation without reduction.
In other words, oxidation is defined as:
Loss of electronsLoss of hydrogen atomsGain of oxygen atomsGain in oxidation numberWhile reduction is defined as:
Gain of electronsGain of hydrogen atomLoss of oxygen atomReduction in oxidation numberMore on oxidation/reduction reactions can be found here: https://brainly.com/question/3867774
An element has 3 electrons, 3 protons and 4 neutrons. What will be its atomic number and mass number? (
Answer:
its atomic number will be 3 and it's mass number will be 7. it is lithium
What property determines whether an acid is a strong acid or a weak acid?
The dissociation of the ions
The total number of molecules
The pH of the acid
Answer:
the pH of the acid is the property that determines whether an acid is a strong acid or a weak acid
Fill in blank.
Normal force is always ____
to the surface you object is resting on.
perpendicular
parallel
opposite
skewed
pls help me pls cuz i need a good grade
14. Which of the following is true of the nucleus?
(a) The nucleus is considered the control center of the cell.
(b) The nucleus contains all the cell’s DNA.
(c) All cells have a nucleus.
(d) all of the above
C. A - ion (negative ion, one with extra negative charge)?
Answer:
Negative ion with one extra electron.
BRAINLIST Pls
Anions are the name for ions that have a negative charge. The body contains several common chemicals as ions. Sodium, potassium, calcium, chloride, and bicarbonate are typical examples.
What are anions ?Negatively charged electrons are called anion. When non-metals gain electrons, they are produced. They absorb one or more electrons. They have a negative charge overall as a result. The ion concentration iodide ( I- ), chloride ( Cl- ), and hydroxide are among examples ( OH– ).
The electrode where reduction takes place in any electrochemical cell is characterized as the cathode. On the other extreme, the positive electrode will draw anions, or negative ions, to itself.
Thus, when an atom obtains electrons, it transforms into the negatively-charged ion known as an anion.
To learn more about anions follow the link below;
https://brainly.com/question/15578817
#SPJ2
Please help!! I don’t know what to do.
Answer:
C
Explanation:
No reaction because not enough moles of silver are present for the reaction to occur.
PLZ HELP i need it now
2. Which of the following statements is true about covalent bonding?
A It is the attraction of atoms for an electron
B it involves the losing and gaining of electrons
Cit involves the sharing of electrons
Dit involves the moving of electrons between energy levels
Answer:
C. it involves the sharing of electrons
Explanation:
A covalent bond consists of the mutual sharing of one or more pairs of electrons between two atoms. These electrons are attracted by the two atomic nuclei. A covalent bond forms when the difference between the electronegativities of two atoms is too small for an electron transfer to occur to form ions.
hope this helps :)
which would best be categorized as heat transfer by conduction?
a.) wearing a white shirt to stay cool on a summer day
b.) warming your body under the sun in summer
c.) feeling the heat from a lightbulb with your hand when touching the bulb
d.) feeling the heat from a light bulb while holding your hand from 6 inches away
Answer:
c.) feeling the heat from a lightbulb with your hand when touching the bulb
Explanation:
In heat transfer by conduction, feeling the heat from a lightbulb with your hand when touching the bulb will be categorised as the best condition.
(6) Predict the number of valence electrons for each of the following elements (4 pts)
(a) P
(b) Ar
(c) c
(d) Ni
Answer:
P = 5, Ar = 8, C = 4, Ni = 2
Explanation:
All these answers can be based off which column of the periodic table each element is in. This does exclude the transition medals in between the 2nd and 13th columns. Column 1 = 1, Column 2 = 2, Column 3 = 3 and so on. Transition metals can be determined based on their electron configuration, which in this case, Ni has 2 electrons in its outer most shell.
A chemist has dissolved a certain substance in water. The chemist knows that more of the substance could be dissolved into the water before it stops dissolving. Therefore, the current solution is
.
Answer is: the current solution is unsaturated.
Unsaturated solution means that more of a substance can be dissolve.
For example:
Solubility of potassium chlorate (KClO₃) at 100 grams of water at 80°C is 37.5 g, that means that all 37.5 g is completely dissolves, this is the saturated solution.
If we add 20 grams of potassium chlorate in 100 grams of water, there is less solute than the saturated solution, so this is unsaturated solution.
A sample of SO2 gas occupies 45.6 L at 373 K and 3.45 atm. How many moles of oxygen atoms?
Answer:
10.3
Explanation: i have this as a assignment rn sooo here you go :)
How long does it take far Uranus to complete one revolution (orbit) around the sun?
What is the empirical formula of a compound that is 27.3% carbon, 9.10% hydrogen and 63.6% nitrogen by mass?
Explanation:
Mass ratio C : H : N = 27.3 : 9.10 : 63.6
Mole ratio C : H : N = 27.3/12: 9.10/1 : 63.6/14
( Divide the mass ratio by their molar masses to find the ratio between moles)
Mole ratio = 2.275 : 9.10 : 4.54
= 2.275/2.275 : 9.10/2.275 : 4.54/2.275
= 1 : 4 : 2
Answer is CH4N2
The empirical formula of a compound is [tex]CH_4N_2[/tex]
What is an Empirical Formula?The empirical formula of a chemical compound is defined as the simplest whole number ratio of the atoms present in a compound.
The empirical formula of a compound defines the simplest ratio of the number of different atoms present. The molecular formula gives the actual number of each different atom present in a molecule. The molecular formula is mainly used which is a multiple of the empirical formula.
Molecular Formula = n × Empirical Formula
For above given example,
Mass ratio C : H : N = 27.3 : 9.10 : 63.6
Mole ratio C : H : N = 27.3/12: 9.10/1 : 63.6/14
( We divide the mass ratio by their molar masses to find the ratio between moles)
Mole ratio = 2.275 : 9.10 : 4.54 = 2.275/2.275 : 9.10/2.275 : 4.54/2.275
= 1 : 4 : 2
Thus, the empirical formula of a compound is [tex]CH_4N_2[/tex]
Learn more about Empirical Formula, here:
https://brainly.com/question/14044066
#SPJ5
"Solution is a homogeneous mixture" explain
Answer:
solution is equal distribution of a solute and liquid
Explanation:
for example water and sugar make a solution
Solutions with a uniform composition are homogeneous solutions. A homogeneous solution, then, has an equal concentration of the constituent substances throughout the entire solution.
Similar to how water molecules are evenly distributed among the Na+ and Cl- ions when sodium chloride dissolves in it. The mixture's composition is constant throughout, and it is difficult to separate the components from one another. Solutions are homogeneous mixtures, which can contain substances in either state (solid, liquid, or gas).
Even if the components were evenly dispersed, they could still be separated at some point in a homogeneous mixture. The components may need to be separated using a procedure like evaporation, distillation, or chromatography, but this is still possible.
Learn more about Homogeneous solutions;
https://brainly.com/question/24898889
In the malate-aspartate shuttle, _____ is reduced to _____ in the cytosol. oxaloacetate; malate aspartate; malate malate; aspartate malate; oxaloacetate aspartate; oxaloacetate
The malate-aspartate shuttle enables oxidative phosphorylation by allowing electrons to be moved across the inner membrane in the mitochondrion during glycolysis in eukaryotes.
In this malate-aspartate shuttle, oxaloacetate is reduced to malate in the cytosol.
During this biochemical system process, the cytosolic malate dehydrogenase which is the primary enzyme present in this shuttle system catalyzes the reaction of oxaloacetate and NADH to produce malate and NAD in the cytosol. This system enables oxidative phosphorylation in eukaryotes.Learn more: https://brainly.com/question/17216910
In Valence Shell Electron Pair Repulsion Theory (VSEPR),
A Bonded electron pairs cancel each other out and do not repel other electrons
B Bonded electron pairs are more repulsive than lone pairs on the central atom
C Bonded electron pairs are less repulsive than lone pairs on the central atom
D Bonded electron pairs are equally as repulsive as lone pairs on the central atom
Answer: look at the close because that is the answer
Explanation:
. What were the factors responsible for the change of dead organic matter into fossil fuels?
Which physical adaptation increases an organism's chances of finding a suitable habitat?
the long legs of wading birds
the croak of frogs
the quills of a porcupine
the venom of snakes
The physical adaptation among the option that increases an organisms
chances of finding a suitable habitat is the long legs of wading birds
An adaptation is a characteristic that helps an animal survive in its habitat.
Any animal who successfully survives on land or water must have behavioural
and physical trait or attributes or adaptation that assist it to achieve those
goals.
This physical adaptation might be body growth, body covering during
weather change, body functioning or even body parts.
The physical adaptation among the option that increases an organisms
chances of finding a suitable habitat is the long legs of wading birds.
The long legs of wading birds assist them to find a suitable habitat. The long
legs can move through shallow water without wetting their feathers.
There long leg give them better eye sight to search for food and suitable
habitats.
read more:https://brainly.com/question/23404495?referrer=searchResults
How does collision theory relate temperature to the rate of a reaction?
Answer:
Explanation:
The collision theory explains why reactions occur between atoms, ions, and molecules. With the increase in temperature, there is an increase in the number of collisions. Increasing the concentration of a reactant increases the frequency of collisions between reactants and will, therefore, increase the reaction rate.
Segments of DNA found in chromosomes are called ——— ?
Answer:
Physically, a gene is a segment (or segments) of a chromosome. Functionally, a gene can play many different roles within a cell.
Explanation:
How can air pollution affect plants
A. Air pollution can block sun light from reaching plants
B. Air pollution can affect the water plants need.
C. Air pollution absorbs carbon dioxide.
D. Air pollution can change normal temperatures of a region.
Answer:
A
Explanation:
B) pollution doesn't affect water
C) Air pollution makes carbon dioxide
D) air pollution does not affect temperature
Put the substance in a 25 mL beaker.
Now, observe and record the following:
state of matter:
appearance and texture:
crystalline structure:
Answer:
liquid no not a solid
Explanation:
When you put the substance in a 25 mL beaker. then the state of matter is solid, appearance and texture are powdered and crystalline structure is not solid(powder).
What are crystalline structures and states of matter?The term "crystalline structure" refers to the arrangement of atoms, ions, or molecules in a crystalline solid. A crystalline solid is a type of material where the constituent particles are arranged in a regular, repeating pattern. This regular arrangement results in a characteristic geometric shape for the crystals. Examples of crystalline solids include salt, sugar, and diamond.
On the other hand, the term "state of matter" refers to the physical form in which matter exists. There are three primary states of matter: solid, liquid, and gas.
Solids have a definite shape and volume and their constituent particles are held tightly together by strong intermolecular forces.
Liquids have a definite volume but no definite shape, and their constituent particles are held together by weaker intermolecular forces.
Gases have no definite shape or volume, and their constituent particles are far apart and move freely.
Other states of matter, such as plasma and Bose-Einstein condensate, also exist but they are less common in everyday life.
Therefore, the state of matter: is solid, its appearance and texture: are powdered, and the crystalline structure: is not solid.
To learn more about states of matter click:
https://brainly.com/question/9402776
#SPJ7
Cómo se clasifica el aire?
Answer:
Not me
Explanation: