$6.02 \times 10^{23}$ molecules

Question 1

Which of the following best describes the type of bond formed between sodium (Na) and chlorine (Cl) in sodium chloride (NaCl)?

Accepted Answer

An ionic bond formed by the transfer of electrons

Question 2

Which of the following compounds is classified as a molecular compound?

Accepted Answer

CO$_2$

Question 3

What is the correct name for the compound Fe$_2$(SO$_4$)$_3$?

Accepted Answer

Iron(III) sulfate

Question 4

What is the chemical formula for dinitrogen pentoxide?

Accepted Answer

N$_2$O$_5$

Question 5

Calculate the molar mass of calcium nitrate, Ca(NO$_3$)$_2$.

Accepted Answer

$164.10\ \mathrm{g/mol}$

Question 6

How many molecules are present in 18.0 g of water (H$_2$O)? (Molar mass = 18.0 g/mol)

Accepted Answer

$6.02 	imes 10^{23}$ molecules

Question 7

A sample contains 40.0 g of NaOH (molar mass = 40.0 g/mol). What is the mass percent of Na in NaOH?

Accepted Answer

$60.0\%$

Question 8

Which of the following is the empirical formula for a compound with a molecular formula of C$_6$H$_{12}$O$_6$?

Accepted Answer

CH$_2$O

Question 9

A hydrocarbon is combusted and produces 44.0 g of CO$_2$ and 18.0 g of H$_2$O. What is the empirical formula of the hydrocarbon?

Accepted Answer

CH$_3$

Question 10

Balance the following chemical equation: $ \mathrm{C_2H_6} + \mathrm{O_2} \rightarrow \mathrm{CO_2} + \mathrm{H_2O} $

Accepted Answer

$2\ \mathrm{C_2H_6} + 7\ \mathrm{O_2} \rightarrow 4\ \mathrm{CO_2} + 6\ \mathrm{H_2O}$

Question 11

If 5.0 g of H$_2$ reacts with 30.0 g of O$_2$ to form water, what is the limiting reactant?

Accepted Answer

H$_2$

Question 12

A reaction has a theoretical yield of 10.0 g, but only 7.5 g of product is collected. What is the percent yield?

Accepted Answer

$75\%$

Question 13

Which of the following is the correct molecular equation for the reaction between aqueous solutions of Na$_2$SO$_4$ and BaCl$_2$?

Accepted Answer

$\mathrm{Na_2SO_4(aq) + BaCl_2(aq) \rightarrow 2NaCl(aq) + BaSO_4(s)}$

Question 14

Which of the following compounds is insoluble in water?

Accepted Answer

BaSO$_4$

Question 15

What is the molarity of a solution prepared by dissolving 10.0 g of NaCl (molar mass = 58.44 g/mol) in enough water to make 500.0 mL of solution?

Accepted Answer

$0.342\ \mathrm{M}$

Question 16

Which of the following is a strong electrolyte?

Accepted Answer

NaCl

Question 17

Write the net ionic equation for the reaction between HCl(aq) and NaOH(aq).

Accepted Answer

$\mathrm{H^+(aq) + OH^-(aq) \rightarrow H_2O(l)}$

Question 18

What is the oxidation state of sulfur in H$_2$SO$_4$?

Accepted Answer

$+6$

Question 19

Which species is the oxidizing agent in the reaction: $\mathrm{Zn(s) + Cu^{2+}(aq) \rightarrow Zn^{2+}(aq) + Cu(s)}$?

Accepted Answer

Cu$^{2+}$(aq)

Exam 2 Study Guide: Bonding, Chemical Reactions, and Aqueous Chemistry

Study Guide - Practice Questions