Chemical Reaction Rates Quiz

What is the rate of a chemical reaction?

• The temperature at which a reaction occurs

• The speed at which a reaction occurs

• The amount of product formed in a reaction

• The energy required to start a reaction

According to collision theory, what is one of the necessary conditions for a reaction to occur between two reactant particles?

• The particles must be of the same size.

• The particles must collide with each other.

• The particles must be in a liquid state.

• The particles must have the same charge.

What is required for reactants to bring about a reaction according to collision theory?

• Sufficient kinetic energy.

• Identical chemical composition.

• High pressure.

• Low temperature.

Why does the reaction slow down as it progresses?

• The temperature decreases.

• The frequency of collisions between particles increases.

• The concentration of reactants decreases.

• The pressure increases.

Which factor increases the rate of a chemical reaction by increasing the number of successful collisions between reactant particles?

• Decreased temperature

• Increased temperature

• Decreased concentration

• Decreased surface area

How does increasing the concentration of dissolved reactants affect the rate of a reaction?

• It decreases the rate

• It has no effect

• It increases the rate

• It stops the reaction

What is the effect of using a suitable catalyst on the rate of a reaction?

• It decreases the rate

• It increases the rate

• It has no effect

• It reverses the reaction

Which of the following will increase the surface area of solid reactants?

• Increasing particle size

• Decreasing particle size

• Keeping particle size constant

• Changing the shape of particles

What happens to the rate of a reaction when the temperature increases by 10°C?

• It decreases by half.

• It remains the same.

• It approximately doubles.

• It triples.

Why do particles move faster at higher temperatures?

• They have less energy.

• They have more energy.

• They are smaller in size.

• They are more numerous.