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 fluorine has 9 protons. If it gains one electron, what is the resulting ion called?

Accepted Answer

Fluoride ion, $$\mathrm{F^-}$$

Question 4

Which of the following is the correct empirical formula for hydrogen peroxide, $$\mathrm{H_2O_2}$$?

Accepted Answer

$$\mathrm{HO}$$

Question 5

Which of the following best explains why the atomic mass of chlorine is approximately 35.5 amu?

Accepted Answer

Chlorine exists as a mixture of two isotopes, $$^{35}\mathrm{Cl}$$ and $$^{37}\mathrm{Cl}$$, with different natural abundances.

Question 6

Which of the following is a property of metals as described in the periodic table?

Accepted Answer

They have a shiny luster and are good conductors of electricity.

Question 7

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

Accepted Answer

Iron(III) chloride

Question 8

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

Accepted Answer

$$\mathrm{Br_2$}$$

Question 9

A sample contains $$100.0\ \mathrm{g} of $$water. How many molecules of water are present in the sample? (Molar mass of water = $$18.02\ \mathrm{g/mol}$$, Avogadro's number $$= 6.022 	imes 10$$^{23}$$)

Accepted Answer

$$3.34 	imes 10$$^{24}$$

Question 10

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

Accepted Answer

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

Question 11

Which of the following acids is correctly named?

Accepted Answer

$$\mathrm{$$HNO_2$$}$$: nitrous acid

Question 12

Which of the following statements about isotopes is correct?

Accepted Answer

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

Question 13

Which of the following is the correct name for $$\mathrm{N_2O_5}$$?

Accepted Answer

Dinitrogen pentoxide

Question 14

Which of the following ions is a polyatomic cation?

Accepted Answer

$$\mathrm{NH_4$^+}$$

Question 15

Which of the following best describes the result of Rutherford's gold foil experiment?

Accepted Answer

It demonstrated that most of the atom is empty space with a small, dense nucleus.

Question 16

What is the correct formula for the compound formed between aluminum and sulfate ions?

Accepted Answer

$$\mathrm{Al_2$(SO_4$)_3}$$

Question 17

Which of the following is the correct name for $$\mathrm{K_2Cr_2O_7}$$?

Accepted Answer

Potassium dichromate

Question 18

Which of the following is a correct statement about the periodic table?

Accepted Answer

Elements in the same group have similar chemical properties.

Question 19

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

Accepted Answer

$$\mathrm{Mg(NO_3$)_2}$$

Question 20

Which of the following is the correct name for $$\mathrm{CH_3CH_2OH}$$?

Accepted Answer

Ethanol

Atoms, Molecules, and Ions: Foundations of Modern Chemistry

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