Question 1

Which of the following statements about isotopes is correct?

Accepted Answer

Isotopes of an element have the same number of protons but different numbers of neutrons.

Question 2

Calculate the number of neutrons in $$^{26}_{12}\mathrm{Mg}.$$

Accepted Answer

$$14$$

Question 3

Which of the following is the correct empirical formula for hydrogen peroxide?

Accepted Answer

$$\mathrm{HO}$$

Question 4

A neutral atom of $$^{197}\mathrm{Au}$$ has how many protons, neutrons, and electrons?

Accepted Answer

79 protons, 118 neutrons, 79 electrons

Question 5

Which of the following elements is NOT a diatomic molecule in its natural state?

Accepted Answer

Argon

Question 6

What is the correct name for $$\mathrm{$$FeCl_3$$}$$?

Accepted Answer

Iron(III) chloride

Question 7

Which of the following ions is a polyatomic ion?

Accepted Answer

$$\mathrm{NO_3$^-}$$

Question 8

What is the formula for magnesium nitride, given that magnesium forms $$\mathrm{Mg$$^{2+}$$}$$ and nitrogen forms $$\mathrm{N$$^{3-}$$}$$?

Accepted Answer

$$\mathrm{Mg_3N_2}$$

Question 9

Which of the following best describes the difference between molecular and empirical formulas?

Accepted Answer

The empirical formula shows the lowest whole-number ratio of atoms, while the molecular formula shows the actual number of atoms in a molecule.

Question 10

What is the correct name for $$\mathrm{K_2SO_4}$$?

Accepted Answer

Potassium sulfate

Question 11

Which of the following is the correct name for $$\mathrm{$$HNO_2$$}$$?

Accepted Answer

Nitrous acid

Question 12

Which of the following compounds is an example of a binary molecular compound?

Accepted Answer

$$\mathrm{CO_2$}$$

Question 13

What is the correct formula for dinitrogen tetroxide?

Accepted Answer

$$\mathrm{N_2O_4}$$

Question 14

Which of the following is the correct formula for the acetate ion?

Accepted Answer

$$\mathrm{CH_3COO^-}$$

Question 15

Which of the following is the correct name for $$\mathrm{Ba(OH)_2}$$?

Accepted Answer

Barium hydroxide

Question 16

A sample of chlorine contains 75.78% $$^{35}\mathrm{Cl} ($$atomic mass = 34.969 amu) and 24.22% $$^{37}\mathrm{Cl} ($$atomic mass = 36.966 amu). What is the atomic weight of chlorine?

Accepted Answer

$$35.45$$ amu

Question 17

Which of the following is the correct name for $$\mathrm{H_2SO_4}$$?

Accepted Answer

Sulfuric acid

Question 18

Which of the following ions is isoelectronic with neon ($$\mathrm{Ne}$$)?

Accepted Answer

$$\mathrm{Na^+}$$

Question 19

What is the correct name for $$\mathrm{$$CuSO_4$$}$$?

Accepted Answer

Copper(II) sulfate

Question 20

Which of the following best explains why ionic compounds are electrically neutral?

Accepted Answer

The total positive charge of the cations equals the total negative charge of the anions.

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

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