Exam 1

1. At constant pressure, the combustion of 15.0 g of C ₂H ₆( g) releases 777 kJ of heat. What is Δ H for the reaction given below?
2 C ₂H ₆( g) + 7 O ₂( g) → 4 CO ₂( g) + 6 H ₂O( l).

1. -129 kJ
2. -1560 kJ
3. -3120 kJ
4. -779 kJ

2.  Which of the following statements is FALSE?

1. Metals tend to form cations.
2. Nonmetals tend to gain electrons.
3. Atoms are usually larger than their corresponding cation
4. Anions are usually larger than their corresponding atom
5. The halogens tend to form 1+ ions

3.   What is the molarity of a NaOH solution if 28.2 mL of a 0.355 M H ₂SO ₄ solution is required to neutralize a 25.0-mL sample of the NaOH solution?

1. 0.400
2. 0.315
3. 0.801
4. 125
5. 0.629

4. In an acid-base neutralization reaction 38.74 mL of 0.500 M potassium hydroxide reacts with 50.00 mL of sulfuric acid solution. What is the concentration of the H ₂SO ₄ solution?

1. 1.29 M
2. 0.194 M
3. 0.775 M
4. 0.387 M

5.  An alligator is 152.4 cm long. How long is he in feet

1. 720.0 ft
2. 5.00 ft
3. 32.2 ft
4. 12.7 ft
5. 60.0 ft