S3 Chemistry - Rate of Reaction

Which of these happens in ALL chemical reactions?

• colour change

• a gas is released

• a new substance is formed

• a solid forms

Which of these is what is meant by 'effervescence'

• colour change

• a gas is released

• a new substance is formed

• a solid forms

What name is given to a reaction where 2 solutions form a solid?

• precipitation

• it doesn't have a specific name

• exothermic

• endothermic

What name is given to a reaction that releases heat?

• precipitation

• it doesn't have a specific name

• exothermic

• endothermic

What name is given to a reaction that absorbs heat?

• precipitation

• it doesn't have a specific name

• exothermic

• endothermic

What happens during an exothermic reaction?

• Temperature decreases

• Temperature increases

• Temperature stays the same

• Temperature increases but then rapidly decreases

Which of these is NOT an example of a chemical reaction?

• burning toast

• cooking a steak

• freezing water

• baking a cake

What is meant by the rate of a reaction?

• the time it finishes

• the speed of a reaction

• the type of reaction that takes place

• none of these

Which of these would NOT speed up a chemical reaction?

• increasing surface area

• increasing particle size

• increasing concentration

• increasing temperature

Why is a reaction the fastest at the start?

• there are the most products at this point

• there are the least mass of reactants at this point

• there are the most reactants at this point

• there is the most time available