CHEMISTRY HIGH SCHOOL

Is this molecule a polar or non polar?

Answers

Answer 1

Answer:

Answer:

This is polar

Explanation:

If the arrows are of different lengths, and if they do not balance each other, the molecule is polar.

If the arrangement is asymmetrical, the molecule is polar.

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What is the percent by mass of chlorine in NaCl?

Answers

The percent by mass of chlorine in NaCl is 60.68 % of chlorine

calculation

mass % of chlorine =mass of chlorine /mass of NaCl x 100

from periodic table the mass of cl= 35.5 g/mol

that of of Na = 23 g/mol

The mass of NaCl is therefore = 35.5 g/mol + 23 g/mol =58.5 g/mol

mass % is therefore= (35.5 / 58.5 x 100) =60.68 %

In the given question, 60.66% is the percent by mass of chlorine in NaCl.

Mass is a physical property of matter that measures the amount of substance in an object. It is typically measured in grams (g) or kilograms (kg).

The molar mass of NaCl is 58.44 g/mol. The molar mass of chlorine is 35.45 g/mol. The formula of NaCl indicates that there is one chlorine atom for every sodium atom. Therefore, the mass of chlorine in NaCl is 35.45 g/mol.

To calculate the percent by mass of chlorine in NaCl, we need to divide the mass of chlorine by the total mass of NaCl and multiply by 100. This can be expressed as follows:

Percent by mass of chlorine = (mass of chlorine/mass of NaCl) × 100

Substituting the values, we get:

Percent by mass of chlorine = (35.45 g/mol/58.44 g/mol) × 100

= 60.66%

Therefore, the percent by mass of chlorine in NaCl is 60.66%.

Learn more about mass here:

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An article about half-lives describes a parent isotope. What is a parent isotope?

Answers

A parent isotope plays an important role in the decay chain process. The parent isotope is the one who undergoes the decay process in the nuclear reaction in order to form its daughter isotope. The daughter isotope may decay on its own and may have its own daughter isotope as well.

Answer:

A. The isotope that forms from the radioactive decay of a less stable isotope

Explanation:

Edge 2021

An increase in the average kinetic energy of a sample of copper atomsoccurs with an increase in(1) concentration (3) pressure(2) temperature (4) volume

Answers

I think the correct answer is in option 2. An increase in the average kinetic energy of a sample of copper atoms occurs with an increase in temperature because temperature is said to be directly proportional to the kinetic energy of the molecules. Therefore, increasing the temperature increases the kinetic energy of the molecules.

How reactive is the element iodine.

Answers

Answer:

Not too reactive

Explanation:

Iodine is a halogen and is reactive, but it is significantly less reactive than other halogens like chlorine, bromine, and fluorine.

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What is involved in redox reactions
A.the transfer of electrons between reactants
B.the bonding of ions to form chemical compounds
C.the addition of water to break down food macromolecules
D.the breaking down of water into hydrogen and oxygen atoms

Answers

Answer:

Explanation:

Redox reactions are comprised of two parts, a reduced half and an oxidized half, that always occur together. The reduced half gains electrons and the oxidation number decreases, while the oxidized half loses electrons and the oxidation number increases.

Answer:

Explanation:

Is crumpling a sheet of paper a physical or chemical change? Why?

Answers

I believe it is a physical change. Crumpling a sheet of paper does not change any properties of the paper and it does not form a new substance it must be a physical change. It is only the shape or form of the paper that is being changed. Hope this answers the question.

It's a physical change. You're not changing the chemical make up of the piece of paper. Only the appearance.

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