Question 1

According to Dalton's Atomic Theory, which statement best explains why the mass of substances remains constant before and after a chemical reaction?

Accepted Answer

Atoms are neither created nor destroyed in chemical reactions.

Question 2

Which group in the periodic table contains elements that are all gases at room temperature and are chemically inert?

Accepted Answer

Group 8A: Noble gases

Question 3

What is the correct formula for a compound formed between Mg$$^{2+}$$ and N$$^{3-}$$ ions?

Accepted Answer

$$	ext{Mg}_3	ext{N}_2$$

Question 4

Which of the following statements about isotopes is correct?

Accepted Answer

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

Question 5

Which particle has the smallest mass according to the comparison table?

Accepted Answer

Electron

Question 6

What is the correct name for the compound $$	ext{NO}_2$$?

Accepted Answer

Nitrogen dioxide

Question 7

Which prefix is used to indicate four atoms in a binary compound formed between nonmetals?

Accepted Answer

Tetra-

Question 8

Which of the following best describes the structure of the atom according to Rutherford's model?

Accepted Answer

Electrons orbit a small, dense nucleus containing protons and neutrons.

Question 9

What is the correct name for $$	ext{HClO}_4$$ according to acid naming rules?

Accepted Answer

Perchloric acid

Question 10

Which element is represented by the atomic symbol 'K' and has an atomic number of 19?

Accepted Answer

Potassium

Question 11

Which of the following is the correct structural formula for ethane?

Accepted Answer

$$	ext{CH}_3	ext{CH}_3$$

Question 12

Which group contains elements that form salts when combined with metals?

Accepted Answer

Halogens

Question 13

What is the correct name for the compound $$	ext{SO}_3$$^{2-}$$?

Accepted Answer

Sulfite

Question 14

Which of the following best describes the charge and mass of a neutron?

Accepted Answer

No charge, mass 1.0087 amu

Question 15

Which compound is an alcohol based on its structure and naming?

Accepted Answer

Methanol

Question 16

Which of the following is a correct application of the law of multiple proportions?

Accepted Answer

The masses of oxygen that combine with a fixed mass of nitrogen in different compounds are in the ratio of small whole numbers.

Question 17

What is the correct name for $$	ext{HClO}_2$$ according to acid naming rules?

Accepted Answer

Chlorous acid

Question 18

Which model of the atom is depicted by a sphere with electrons embedded throughout, representing positive charge spread evenly?

Accepted Answer

Thomson's 'plum pudding' model

Question 19

Which radioactive emission is deflected toward the positive plate in an electric field?

Accepted Answer

Beta ($$\beta) $$rays

Question 20

If a neutral atom has 19 protons, how many electrons does it have?

Accepted Answer

19

Atoms, Molecules, and Ions: Foundations of Chemical Structure and Nomenclature

Study Guide - Practice Questions