FACTORS AFFECTING RATE OF REACTION

1. Which of the following is NOT TRUE about catalysts?

• A catalyst is a substance that can be added to a reaction to increase the reaction rate without getting consumed in the process.

• Catalysts typically speed up a reaction by reducing the activation energy     or changing the reaction mechanism.

• Enzymes are proteins that act as catalysts in biochemical reactions.

• None of these

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In which temperature will the rate of reaction between Sodium chloride and water likely to be greatest?

• 10°C                  

• 20°C                 

• 30°C               

• 40°C

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It refers to the minimum energy required for reactions to start.

• Activation energy

• Kinetic energy

• Potential energy

• Stored energy

Marble reacts with hydrochloric acid to produce calcium chloride, water and

carbon dioxide. In which of these mixtures is the rate of reaction likely to be

the greatest?

• 1g of marble chips in 100cm3 of HCl at 20°C

• 1g powdered marble in 100cm3 of HCl at 30°C

• 1g powdered marble in 100cm3 of HCl at 20°C

• 1g marble chips in 100cm3 of HCl at 30°C

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Which of the following is NOT A FACTOR that affects the reaction rates?

• Reactant concentration

• Catalysts

• Particle size

• Shape of particles

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How does increasing the concentration affect a reaction rate?

• makes it go faster (increases rate)

• makes it go slower (decreases rate)

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Which of the following increases a reaction rate without being used up?

• Product

• Reactant

• Catalyst

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Increasing the temperature will increase the kinetic energy of particles, therefore increasing the frequency of the collisions among particles.

• TRUE

• FALSE

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If solution A is put into an ice water bath before being combined with solution B, how would the reaction rate be altered?

• it would be faster (rate increases)

• it would be slower (rate decreases)

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Which of the following best describes the Collision Theory?

• reactants must collide, collide with proper orientation, and enough activation energy

• products must collide, collide with proper orientation, and enough activation energy

• the activated complex must collide, collide with proper orientation, and enough activation energy

• reactants and products together must collide, collide with proper orientation, and enough activation energy

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