Question 1

Which of the following statements best describes the Law of Multiple Proportions?

Accepted Answer

If two elements form more than one compound, the masses of one element that combine with a fixed mass of the other are in the ratio of small whole numbers.

Question 2

Which experiment led to the discovery of the electron and its charge-to-mass ratio?

Accepted Answer

Thomson's cathode ray tube experiment

Question 3

A neutral atom of sulfur has an atomic number of 16 and a mass number of 32. How many neutrons does it contain?

Accepted Answer

$$16$$ neutrons$$ = 32 - 16$$

Question 4

Which of the following is NOT a postulate of Dalton’s Atomic Theory?

Accepted Answer

Atoms can be converted into energy in chemical reactions.

Question 5

Which of the following best explains why the atomic mass of chlorine is not a whole number?

Accepted Answer

Chlorine exists as a mixture of isotopes with different masses.

Question 6

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

Accepted Answer

Noble gases

Question 7

What is the empirical formula for glucose, whose molecular formula is $$C_6H_{12}O_6$?

Accepted Answer

$$CH_2O$$

Question 8

Which of the following ions is a polyatomic cation?

Accepted Answer

$$NH_4$$^+$$

Question 9

A compound is found to contain 40.0% carbon, 6.7% hydrogen, and 53.3% oxygen by mass. What is its empirical formula?

Accepted Answer

$$CH_2O$$

Question 10

Which of the following correctly names the compound $$FeCl_3$$?

Accepted Answer

Iron(III) chloride

Question 11

Which of the following is a diatomic molecule that is a liquid at room temperature?

Accepted Answer

$$Br_2$$

Question 12

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

Accepted Answer

Sulfuric acid

Question 13

Which of the following best describes the difference between a cation and an anion?

Accepted Answer

A cation is formed by losing electrons, and an anion is formed by gaining electrons.

Question 14

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

Accepted Answer

$$Mg(NO_3$)_2$$

Question 15

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 16

Which of the following best explains why metals are good conductors of electricity?

Accepted Answer

Metals have loosely bound electrons that can move freely.

Question 17

What is the correct name for $$N_2O_5$$?

Accepted Answer

Dinitrogen pentoxide

Question 18

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

Accepted Answer

$$(NH_4$)_2SO_4$$

Question 19

Which of the following is a property of nonmetals?

Accepted Answer

They can exist as solids, liquids, or gases at room temperature.

Question 20

Which of the following is the correct name for $$K_2Cr_2O_7$$?

Accepted Answer

Potassium dichromate

Atoms, Molecules, and Ions: Foundations of Modern Chemistry

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