Question 1

Which statement best describes a major insight from Rutherford's gold foil experiment?

Accepted Answer

Atoms are mostly empty space with a dense, positively charged nucleus.

Question 2

Which of the following is the correct formula for barium nitride?

Accepted Answer

$$\mathrm{Ba_3N_2}$$

Question 3

A neutral atom of chlorine has 17 protons and 18 neutrons. What is its mass number and how is it represented in isotope notation?

Accepted Answer

$$^{35}\mathrm{Cl}$$

Question 4

Which of the following statements about ions is correct?

Accepted Answer

Anions are formed when nonmetals gain electrons.

Question 5

Which of the following best explains why the mass of an atom is concentrated in its nucleus?

Accepted Answer

Protons and neutrons, which are much heavier than electrons, are located in the nucleus.

Question 6

Which of the following is the correct name for $$\mathrm{Fe_2O_3}$$?

Accepted Answer

Iron(III) oxide

Question 7

A sample of neon contains 90.4% $$^{20}\mathrm{Ne}$$, 0.2% $$^{21}\mathrm{Ne}$$, and 9.4% $$^{22}\mathrm{Ne}. $$Which isotope is most abundant and what does this imply about the atomic weight of neon?

Accepted Answer

$$^{20}\mathrm{Ne} is $$most abundant; the atomic weight will be closest to 20.

Question 8

Which of the following is the empirical formula for glucose ($$\mathrm{C_6H_{12}O_6$}$$)?

Accepted Answer

$$\mathrm{CH_2O}$$

Question 9

Which of the following is the correct name for $$\mathrm{$$KClO_4$$}$$?

Accepted Answer

Potassium perchlorate

Question 10

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

Accepted Answer

A molecular formula shows the exact number of atoms of each element, while an empirical formula shows the simplest whole-number ratio.

Question 11

Which of the following is the correct formula for magnesium nitride?

Accepted Answer

$$\mathrm{Mg_3N_2}$$

Question 12

Which of the following is a correct statement about isotopes?

Accepted Answer

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

Question 13

Which of the following is the correct name for $$\mathrm{N_2O_4}$$?

Accepted Answer

Dinitrogen tetroxide

Question 14

A neutral atom has 15 protons, 16 neutrons, and 18 electrons. What is the correct symbol for this species?

Accepted Answer

$$^{31}\mathrm{P}^{3-}$$

Question 15

Which of the following acids is correctly named?

Accepted Answer

$$\mathrm{H_2SO_4}$$: sulfuric acid

Question 16

Which of the following statements about the periodic table is correct?

Accepted Answer

Elements in the same group have similar chemical properties.

Question 17

Which of the following is the correct formula for ammonium sulfate?

Accepted Answer

$$\mathrm{(NH_4$)_2SO_4}$$

Question 18

Which of the following is the correct name for $$\mathrm{CO_2$}$$?

Accepted Answer

Carbon dioxide

Question 19

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.

Question 20

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

Accepted Answer

Nitrous acid

Atoms, Molecules, and Ions: Foundations of General Chemistry

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