National 5 Chemistry - Collision Theory

What happens to particles when the temperature increases?

• They move faster

• They disappear

• They stop moving

• They move slower

What effect does increasing concentration have on a reaction?

• Slows down the reaction

• Speeds up the reaction

• Stops the reaction

• No effect on the reaction

What happens to the reaction rate when particle size decreases?

• It stops

• It stays the same

• It increases

• It decreases

What is a catalyst?

• A substance that slows down a reaction

• A substance that changes color during a reaction

• A substance that stops a reaction

• A substance that speeds up a reaction without being used up

What is the role of enzymes in the body?

• They are structural proteins

• They are used for transporting oxygen

• They are used for energy storage

• They are biological catalysts

How is reaction rate calculated?

• Rate = change in volume / change in mass

• Rate = change in mass / change in volume

• Rate = change in quantity / change in time

• Rate = change in time / change in quantity

What does a larger surface area of reactants lead to?

• More collisions

• No change in collisions

• Collisions stop

• Fewer collisions

What is the effect of adding a catalyst to a reaction?

• It has no effect on the reaction

• It slows down the reaction

• It speeds up the reaction

• It stops the reaction

What is the effect of increasing temperature on reaction rate?

• No effect on reaction rate

• Stops the reaction

• Increases reaction rate

• Decreases reaction rate

What is the result of more frequent collisions in a reaction?

• No change in reaction

• Reaction stops

• Slower reaction

• Faster reaction