Question 1

Which statement best describes the difference between a molecular formula and an empirical formula?

Accepted Answer

A molecular formula gives the exact number of atoms of each element in a compound, while an empirical formula gives the lowest whole-number ratio of atoms.

Question 2

What is the empirical formula for hydrogen peroxide ($$H_2O_2$$)?

Accepted Answer

$$HO$$

Question 3

A neutral atom of potassium ($$K) $$has an atomic number of 19 and an atomic weight of approximately 39. How many protons, neutrons, and electrons does a $$K^+$$ ion have?

Accepted Answer

19 protons, 20 neutrons, 18 electrons

Question 4

Which of the following ions is a polyatomic cation?

Accepted Answer

$$NH_4$$^+$$

Question 5

What is the correct formula for the ionic compound formed between $$Mg^{2+}$$ and $$NO_3$$^-$$?

Accepted Answer

$$Mg(NO_3$)_2$$

Question 6

Which of the following is the correct name for $$Fe^{3+}$$?

Accepted Answer

Iron(III) ion

Question 7

What is the charge on the ion formed by a Group 1A element?

Accepted Answer

$$+1$$

Question 8

Which of the following is a diatomic molecule?

Accepted Answer

$$H_2$$

Question 9

What is the correct name for $$ClO_4$$^-$$?

Accepted Answer

Perchlorate ion

Question 10

Which of the following acids is formed when $$NO_3$$^-$$ is dissolved in water?

Accepted Answer

Nitric acid ($$HNO_3)$$

Question 11

What is the correct formula for aluminum oxide?

Accepted Answer

$$Al_2O_3$$

Question 12

Which of the following is the correct name for $$CO_2$$?

Accepted Answer

Carbon dioxide

Question 13

What is the correct formula for sodium phosphate?

Accepted Answer

$$Na_3PO_4$$

Question 14

Which of the following is the correct empirical formula for ethylene ($$C_2H_4$$)?

Accepted Answer

$$CH_2$$

Question 15

Which of the following is the correct name for $$CCl_4$$?

Accepted Answer

Carbon tetrachloride

Question 16

What is the correct formula for magnesium nitrate?

Accepted Answer

$$Mg(NO_3$)_2$$

Question 17

Which of the following is the correct name for $$CH_3CH_2OH$$?

Accepted Answer

Ethanol

Question 18

If an atom loses two electrons, what is the resulting charge?

Accepted Answer

$$+2$$

Question 19

Which of the following is the correct name for $$SO_4$$^{2-}$$?

Accepted Answer

Sulfate ion

Question 20

What is the correct name for $$H_2SO_4$$?

Accepted Answer

Sulfuric acid

Atoms, Molecules, and Ions: Structure, Formulas, and Nomenclature

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