Question 1

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 2

Calculate the number of neutrons in an atom of $$^{197}_{79}\mathrm{Au} ($$gold).

Accepted Answer

$$197 - 79 = 118$$ neutrons

Question 3

Which of the following pairs of elements would you expect to have the most similar chemical properties?

Accepted Answer

Mg and Ca

Question 4

What is the empirical formula for a compound with the molecular formula $$C_6H_{12}O_6$?

Accepted Answer

$$CH_2O$$

Question 5

Which of the following ions is isoelectronic with Ne ($$Z=10$$)?

Accepted Answer

$$F^-$$

Question 6

What is the correct name for $$FeCl_2$$?

Accepted Answer

Iron(II) chloride

Question 7

Which of the following compounds is ionic?

Accepted Answer

$$CaCl_2$$

Question 8

What is the formula for ammonium sulfate?

Accepted Answer

$$(NH_4$)_2SO_4$$

Question 9

Which of the following is the correct name for $$H_2SO_3$$?

Accepted Answer

Sulfurous acid

Question 10

A sample of carbon contains 98.93% $$^{12}C (12.0000 $$amu) and 1.07% $$^{13}C (13.00335 $$amu). What is the average atomic mass of carbon?

Accepted Answer

$$12.01$$ amu

Question 11

Which of the following is a diatomic molecule?

Accepted Answer

$$O_2$$

Question 12

What is the charge on the ion formed by an atom of sulfur when it achieves a noble gas configuration?

Accepted Answer

$$2-$$

Question 13

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

Accepted Answer

$$Mg_3N_2$$

Question 14

Which of the following best describes a cation?

Accepted Answer

A positively charged ion formed when an atom loses electrons.

Question 15

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

Accepted Answer

Dinitrogen pentoxide

Question 16

Which of the following is the correct formula for perchloric acid?

Accepted Answer

$$HClO_4$$

Question 17

Which of the following best describes the difference between a molecular and an empirical formula?

Accepted Answer

A molecular formula gives the exact number of atoms of each element, while an empirical formula gives the simplest whole-number ratio.

Question 18

Which of the following is the correct name for $$K_2S$$?

Accepted Answer

Potassium sulfide

Question 19

What is the correct formula for cobalt(II) oxide?

Accepted Answer

$$CoO$$

Question 20

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

Accepted Answer

Elements in the same group have similar chemical properties.

Atomic Structure, Periodic Table, and Chemical Nomenclature: General Chemistry Study Notes

Study Guide - Practice Questions