Chemistry Chegg Worksheet

3. Classify each of these as an acid or a base. Which are strong and which are weak? What ions are produced when each is dissolved in water?

a. KOH

b. Mg(OH)2

c. HClO

d. HBr

e. LiOH

f. H2SO3

4. Balance the following equations and then write the net ionic equation.

a. (NH4)2CO3(aq)+Cu(NO3)2(aq)→CuCO3(s)+NH4NO3(aq)

b. Pb(OH)2(s)+HCl(aq)→PbCl2(s)+H2O(l)

c. BaCO3(s)+HCl(aq)→BaCl2(aq)+H2O(l)+CO2(g)

d. CH3CO2H(aq)+Ni(OH)2(s)→Ni(CH3CO2)2(aq)+H2O(l)

5. Balance the following equations, and then write the net ionic equation.

a. Zn(s)+HCl(aq)→H2(g)+ZnCl2(aq)

b. Mg(OH)2(s)+HCl(aq)→MgCl2(aq)+H2O(l)

c. HNO3(aq)+CaCO3(s)→Ca(NO3)2(aq)+H2O(l)+CO2(g)

d. (NH4)2S(aq)+FeCl3(aq)→NH4Cl(aq)+Fe2S3(s)

6. How many entities are present in each of the following?

a. 3.21 mol argon atoms

b. 1.3×10-12 mol marbles

c. 3×106 mol water molecules

d. 7.63×10-18 mol basketballs

7. Calculate the molar mass of each of the following compounds.

a. Fe2O3, iron(III) oxide

b. BCl3, boron trichloride

c. C6H8O6, ascorbic acid (vitamin C)

8. Calculate the molar masses (in grams per mole) of each of the following.

a. cane sugar, C12H22O11

b. laughing gas, N2O

c. vitamin A, C20H30O

9. Calculate the molar mass of each these compounds and the mass percentage of each element.

a. PbS, lead(II) sulfide, galena

b. C2H6, ethane, a hydrocarbon fuel

c. CH3COOH, acetic acid, an important ingredient in vinegar

d. NH4NO3, ammonium nitrate, a fertilizer

10. When an automobile air bag deploys, solid sodium azide decomposes rapidly to produce nitrogen gas, and this gas inflates the bag. What is the molar mass of sodium azide (NaN3)?