Practice Problems for CHE 117

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Limiting Reagent Practice Problems

Consider the following reaction. Given 10.0 grams of methane (CH4) and 10.0 grams of oxygen (O2), how much carbon dioxide (CO2) can form?
CH4      +      2 O2      reaction arrow       2 H2O      +      CO2

Consider the following reaction. Given 150 g of chlorine (Cl2) and 100 grams of sodium (Na), how much sodium chloride (NaCl) can form?
2 Na      +      Cl2      reaction arrow       2 NaCl

Related problems in your textbook, Chapter 8: 7, 8, 42, 43, 44, 45, 46

Neutralization Practice Problems

Predict the products for each of the following reactions. Be careful to get the correct formula for each product.

KOH      +      H2SO4      reaction arrow

H3PO4      +      NaOH      reaction arrow

HNO3      +      Mg(OH)2      reaction arrow

HCl      +      Ca(OH)2      reaction arrow

Similar problems in Chapter 9 of your textbook: 15, 16, 17, 26

Oxidation Reduction Practice Problems

Identify what is oxidized and what is reduced.
Identify the oxidizing agent and the reducing agent.

CH4      +      2 O2      reaction arrow       2 H2O      +      CO2

2 Al2O3      +      3 C      reaction arrow       4 Al      +      3 CO2

4 Fe      +      3 O2      reaction arrow       2 Fe2O3

2 Zn      +      O2      reaction arrow       2 ZnO

FeCl2      +      Zn      reaction arrow       ZnCl2      +      Fe

2 Cu      +      O2      reaction arrow 2 CuO

Related problems in Chapter 10 of your textbook: 3, 8, 9, 12, 13, 14

pH Problems

Determine the pH for each of the following solutions.

1.0 x 10-5 M HNO3

0.0342 M NaOH

1.52 x 10-4 M HCl

acetic acid with [H3O+] = 3.62 x 10-3

ammonia solution with [-OH] = 4.6 x 10-5

Related problems in Chapter 9 of your textbook: 34, 35, 36

Determine the [H3O+] for solutions with the following pH values.

2.43

8.65

11.74

3.68

7.52

Related Problems in Chapter 9 of your textbook: Concept Check 9B problems 7 and 8

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