Question 1

Which law states that the total mass of substances present after a chemical reaction is the same as the mass before the reaction?

Accepted Answer

Law of Conservation of Mass

Question 2

Which experiment led to the discovery of the electron?

Accepted Answer

Cathode ray tube experiment

Question 3

A sample contains 12 grams of carbon and 32 grams of oxygen. Which compound is this most likely to be?

Accepted Answer

Carbon dioxide (CO$$_2)$$

Question 4

Which subatomic particle has a relative mass close to zero?

Accepted Answer

Electron

Question 5

What is the correct formula for magnesium nitride, formed from Mg$$^{2+}$$ and N$$^{3-}$$ ions?

Accepted Answer

$$\mathrm{Mg_3N_2}$$

Question 6

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

Accepted Answer

Ne$$_2$$

Question 7

A neutral atom of $$^{14}C $$has how many protons, neutrons, and electrons?

Accepted Answer

6 protons, 8 neutrons, 6 electrons

Question 8

Which statement best describes the result of Rutherford’s gold foil experiment?

Accepted Answer

Atoms have a small, dense, positively charged nucleus.

Question 9

Which of the following ions is a polyatomic ion?

Accepted Answer

NO$$_3^-$$

Question 10

What is the empirical formula for glucose, C$$_6H$_{12}O$_6$$?

Accepted Answer

$$\mathrm{CH_2O}$$

Question 11

Which of the following is the correct name for the compound SO$$_3$$?

Accepted Answer

Sulfur trioxide

Question 12

Which group on the periodic table contains the noble gases?

Accepted Answer

Group 8A

Question 13

What is the correct formula for the acetate ion?

Accepted Answer

$$\mathrm{CH_3COO^-}$$

Question 14

Which of the following best describes a metalloid?

Accepted Answer

An element with properties intermediate between metals and nonmetals

Question 15

Which of the following is the correct name for HClO$$_2$$?

Accepted Answer

Chlorous acid

Question 16

If the natural abundances of $$^{35}Cl $$and $$^{37}Cl $$are 75% and 25% respectively, what is the atomic weight of chlorine? ($$^{35}Cl = 34.97 $$amu, $$^{37}Cl = 36.97 $$amu)

Accepted Answer

$$35.47$$ amu

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 a correct statement about isotopes?

Accepted Answer

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

Question 19

Which of the following is the correct name for N$$_2O$_5$$?

Accepted Answer

Dinitrogen pentoxide

Question 20

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

Accepted Answer

$$\mathrm{$$ClO_4$$^-}$$

Atoms, Molecules, and Ions: Foundations of Modern Atomic Theory

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