CHEMISTRY HIGH SCHOOL

How many moles are in 22 grams of argon

Answers

Answer 1

Answer:

Explanation:

It is known that number of moles equal mass divided by molar mass.

Mathematically, Number of moles = $(mass given)/(molar mass)$

Since, it is given that mass is 22 grams and molar mass of argon is 40 g/mol.

Therefore, Number of moles = $(mass given)/(molar mass)$

= $(22 g)/(40 g/mol)$

= 0.55 mol

Thus, we can conclude that there are 0.55 moles in 22 grams of argon.

Answer 2

Answer: number of moles are the amount of substance of an element .
number of moles can be calculated as follows;
number of moles = mass present / molar mass of element
molar mass of Ar - 40 g/mol
number of moles of Ar = 22 g / 40 g/mol = 0.55 mol .
there are 0.55 mol of Ar

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How did Moseley establish a more accurate periodic table?

Answers

Moseley established a more accurate periodic table by closer determination of atomic numbers. Through the results of his measurements of the wavelengths of the X-ray spectral lines of a number of elements which showed that the ordering of the elements by atomic number.

Answer:

B. by arranging the elements according to atomic number instead of atomic mass

Explanation:

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Which of the following atoms would have the smallest atomic radius?

Answers

Answer:

Lithuim is the smallest

Explanation:

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The molecule that functions as the reducing agent (electron donor) in a redox or oxidation-reduction reaction _____. a)loses electrons and loses potential energy
b)gains electrons and gains potential
c)energy gains electrons and loses potential energy
d)loses electrons and gains potential energy

Answers

Answer : The correct option is a) Loses electrons and loses potential energy.

Explanation :

Reducing agent : In a redox reaction, it is oxidized by the loss of electrons and by the loses of potential energy. It is also called as electron donor.

Reducing agent reduces others by loss of electron and its oxidation state increases.

For example : Sodium is a reducing agent and itself oxidized as follows,

$Na\rightarrow Na^++e^-$

Therefore, the molecule that function as a reducing agent in a redox reaction is loses electrons and loses potential energy.

Final answer:

In a redox reaction, the reducing agent loses both electrons and potential energy. This process results in oxidation of the reducing agent as the oxidation state of the reducing agent increases.

Explanation:

Oxidation-Reduction Reaction

In a redox or oxidation-reduction reaction, the molecule acting as the reducing agent (or electron donor) loses electrons and loses potential energy. Hence, the correct option is a). The reducing agent donates electrons to another substance or molecule and, in this process, is itself oxidized. The oxidation state of the reducing agent increases. The reduction process involves a gain of electrons, but this gain happens to the substance that receives the electrons, not the one who donates them (the reducing agent).

Learn more about Oxidation-Reduction Reaction here:

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Creates clouds, snow, sleet, rain and hail

Answers

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Answer:

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Explanation:

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which statement describes all chemical changes but not all physical changes a bubbles are produced b a new substance forms c phase changes occur D a color change occurs

Answers

The correct answer is:

B; A new substance forms.

Explanation:

A physical change, such as a state change or dissolving, does not produce a new substance, but an abundant change does. In a chemical reaction, the atoms and molecules that connect with each other are described as reactants. Chemical reactions happen when chemical bonds are broken and formed. If the molecules in a substance crash into each other with enough energy, some of the bonds in the molecules can break. The atoms can make new bonds with different atoms. A new substance forms.

B; A new substance forms.

Which two statements are true for both compounds and mixtures?A. Their particles are held together by chemical bonds.

B. They are made up of more than one type of atom.

O C. They can be separated into two or more elements.

O D. Their particles all have the same chemical formula.