Question 1: A 5.45g combustible sample is burned in a calorimeter. The heat generated changes the temperature of 555g water from 20.5 C to 39.5 C. How much energy is released by the burning? The specific heat of water is 4.18 J/(C g).
- 564 J
- 2500 J
- 44100 J
- 138000 J
Question 2: How can a sample of uranium-235 that has critical mass be induced to react?
- It must be spilt with a laser.
- It must be fused to a helium nucleus.
- It must be bombarded it with neutrons.
- It must be shot with light speed electrons.
Question 3: What happens when an acid reacts with an active metal?
- A neutralization reaction occurs.
- Hydronium ion concentration is increased.
- Oxygen gas is produced.
- Hydrogen gas is produced.
Question 4: According to the collision theory and model created to explain the collision theory, what is the best explanation for why a higher temperature makes a reaction go faster?
- There are more collisions per minute.
- It increases the distance between the particles.
- It increases the average kinetic energy of the particles.
- It increases the average kinetic energy and there are more collisions per minute.
Question 5: Which answer describes a chemical reaction in equilibrium?
- The reactants are all used up.
- All the product is formed.
- The forward and reverse reactions have ceased.
- The forward and reverse reaction rates are the same.