Question 1

Which statement from Dalton's Atomic Theory is still accepted as correct today?

Accepted Answer

Atoms of different elements combine to form compounds in small whole number ratios.

Question 2

A certain isotope of element X has 17 protons and 20 neutrons. What is the correct nuclear symbol for this isotope?

Accepted Answer

$$\displaystyle \frac{37}{17}Cl$$

Question 3

Which experiment led to the discovery that the atom is mostly empty space with a dense, positively charged nucleus?

Accepted Answer

Rutherford's gold foil experiment

Question 4

Which of the following ions has 16 protons, 18 electrons, and 16 neutrons?

Accepted Answer

$$\displaystyle \mathrm{S}^{2-}$$

Question 5

Which of the following best describes a cation?

Accepted Answer

An atom that has lost electrons and has a positive charge

Question 6

What is the correct name for the compound $$\displaystyle \mathrm{Fe}_2\mathrm{O}_3$$?

Accepted Answer

Iron(III) oxide

Question 7

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

Accepted Answer

$$\displaystyle (NH_4$)_2SO_4$$

Question 8

A sample of an element contains atoms with 12 protons, 12 neutrons, and 10 electrons. What is the identity and charge of this species?

Accepted Answer

Magnesium ion, $$\displaystyle \mathrm{Mg}^{2+}$$

Question 9

Which of the following compounds is a binary molecular compound?

Accepted Answer

Carbon dioxide

Question 10

What is the correct name for $$\displaystyle \mathrm{N}_2\mathrm{O}_5$$?

Accepted Answer

Dinitrogen pentoxide

Question 11

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

Accepted Answer

$$\displaystyle \mathrm{Ca(NO_3$)_2}$$

Question 12

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 13

Which of the following is the correct name for $$\displaystyle \mathrm{$$HNO_2$$} (aq$$)?

Accepted Answer

Nitrous acid

Question 14

A neutral atom of phosphorus has 15 electrons. What is the electron configuration of the $$\displaystyle \mathrm{P}^{3-}$$ ion?

Accepted Answer

$$\displaystyle 1s^2$\ 2s^2$\ 2p^6$\ 3s^2$\ 3p^6$

Question 15

Which of the following best explains why Group 1 metals form $$\displaystyle 1^+$$ ions?

Accepted Answer

They have one valence electron that is easily lost to achieve a stable noble gas configuration.

Question 16

Which of the following is the correct formula for aluminum carbonate?

Accepted Answer

$$\displaystyle \mathrm{Al_2$(CO_3$)_3}$$

Question 17

Which of the following is a correct example of a ternary oxyacid and its corresponding anion?

Accepted Answer

Sulfuric acid ($$\displaystyle \mathrm{H_2SO_4}) $$and sulfate ion ($$\displaystyle \mathrm{SO_4$^{2-}})$$

Question 18

Which of the following best describes the difference between a binary ionic compound and a binary molecular compound?

Accepted Answer

A binary ionic compound consists of a metal and a nonmetal, while a binary molecular compound consists of two nonmetals.

Question 19

Which of the following is the correct name for $$\displaystyle \mathrm{HCl} (aq$$)?

Accepted Answer

Hydrochloric acid

Question 20

A sample of a compound contains 40.0 g of calcium and 60.0 g of oxygen. If the atomic masses are $$\displaystyle 40.0\ \mathrm{g/mol}$$ for Ca and $$\displaystyle 16.0\ \mathrm{g/mol}$$ for O, what is the empirical formula of the compound?

Accepted Answer

$$\displaystyle \mathrm{CaO}$$

Atoms, Molecules, and Ions: Foundations of Atomic Theory and Chemical Nomenclature

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