Reference no: EM13586395

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.