Question 1

How many of each type of atom are present in the formula $\mathrm{(NH_4)_2HPO_4}$?

Accepted Answer

N: 2, H: 9, P: 1, O: 4

Question 2

What is the correct formula for a compound that has ten oxygen atoms and four phosphorus atoms?

Accepted Answer

$\mathrm{P_4O_{10}}$

Question 3

Which of the following is the correct formula for an ionic compound made of aluminum and oxygen?

Accepted Answer

$\mathrm{Al_2O_3}$

Question 4

What is the correct name for the formula $\mathrm{CaCO_3}$?

Accepted Answer

Calcium carbonate

Question 5

Which of the following pairs of names and formulas does NOT match?

Accepted Answer

Copper(I) nitrate: CuNO$_3$

Question 6

What is the name of the molecular compound $\mathrm{SO_3}$?

Accepted Answer

Sulfur trioxide

Question 7

What is the correct formula for the molecular compound heptaphosphorus octafluoride?

Accepted Answer

$\mathrm{P_7F_8}$

Question 8

What is the oxygen-to-hydrogen mass ratio for $\mathrm{H_2O_2}$?

Accepted Answer

8:1

Question 9

Which of the following is a molecular compound?

Accepted Answer

Nitrogen monoxide

Question 10

Calculate the formula mass for potassium nitrate ($\mathrm{KNO_3}$). Use atomic masses: K = 39.10, N = 14.01, O = 16.00.

Accepted Answer

101.11 g/mol

Question 11

How many mercury atoms are in 5.8 mol of mercury?

Accepted Answer

$3.49 	imes 10^{24}$ atoms

Question 12

A 0.45 g sample of children's aspirin is decomposed to 0.27 g of carbon. What is the mass percent of carbon in the aspirin?

Accepted Answer

60.0%

Question 13

A compound has N and O. On decomposition, it produces 1.78 g of N and 4.05 g of O. What is the empirical formula?

Accepted Answer

$\mathrm{NO_2}$

Question 14

Which of the following is evidence of a chemical reaction?

Accepted Answer

All of the above: color change, solid formation, gas formation, emission of light

Question 15

Which ion would NOT be a spectator ion in the precipitation reaction: $\mathrm{Pb(NO_3)_2(aq) + 2KCl(aq) \rightarrow PbCl_2(s) + 2KNO_3(aq)}$?

Accepted Answer

$\mathrm{Pb^{2+}}$

Question 16

What type of reaction is represented by the generic equation $\mathrm{AB + CD \rightarrow AD + CB}$?

Accepted Answer

Double displacement reaction

Question 17

Which of the following reactions is a double displacement reaction?

Accepted Answer

$\mathrm{KCl(aq) + AgNO_3(aq) \rightarrow AgCl(s) + KNO_3(aq)}$

Question 18

What are the coefficients for the balanced equation: $\mathrm{Na_3PO_4 + Ba(NO_3)_2 \rightarrow NaNO_3 + Ba_3(PO_4)_2}$?

Accepted Answer

2, 3, 6, 1

Question 19

Which of the following compounds is soluble in water and will dissociate into ions?

Accepted Answer

$\mathrm{Na_2SO_4}$

Introduction to Chemistry: Study Guide for Chapters 5–7 (Atoms, Compounds, Chemical Reactions, and Stoichiometry)

Study Guide - Practice Questions