Activation energy (AQA GCSE Chemistry Combined Science): Quizzes
📚Quizzes
Practise the questions
12 questions from this quiz
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Practise the questions
12 questions from this quiz
What is activation energy?
What is activation energy?
Min. energy needed to start a reaction
What symbol represents activation energy?
What symbol represents activation energy?
Ea
What must particles have when they collide for a reaction to occur?
What must particles have when they collide for a reaction to occur?
At least the activation energy
Why don't all collisions between particles result in a reaction?
Why don't all collisions between particles result in a reaction?
Particles may lack sufficient energy
In an exothermic reaction, how does product energy compare to reactant energy?
In an exothermic reaction, how does product energy compare to reactant energy?
Products have less energy
What happens to energy in an endothermic reaction?
What happens to energy in an endothermic reaction?
Energy is absorbed from surroundings
Do endothermic reactions need activation energy?
Do endothermic reactions need activation energy?
Yes, all reactions need it
What do catalysts do to reactions?
What do catalysts do to reactions?
Speed them up without being used up
How do catalysts make reactions faster?
How do catalysts make reactions faster?
By lowering the activation energy
Do catalysts change what products are formed in a reaction?
Do catalysts change what products are formed in a reaction?
No, same products are formed
On an energy level diagram, what does the peak of the curve show?
On an energy level diagram, what does the peak of the curve show?
The activation energy
On an energy diagram, what shows the overall energy change?
On an energy diagram, what shows the overall energy change?
Difference between start and end