C7 Rates of Reaction and Energy Changes
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What is activation energy?
The minimum energy that particles need to react when they collide
What happens to the rate if you increase the temperature?
• Particles have more kinetic energy • Frequency of collisions increases • Frequency of successful collisions increases
What happens to the rate if you use smaller solid particles?
• Larger surface area to volume ratio so more particles available to collide • Frequency of collisions increases • Frequency of successful collisions increases
What happens to the rate if you increase the concentration/pressure?
• More particles per unit volume • Frequency of collisions increases • Frequency of successful collisions increases
What is a catalyst?
A substance which increases the rate of reaction by lowering the activation energy without being used up in the reaction
What is an exothermic reaction?
A reaction that gives out energy to the surroundings
What is an endothermic reaction?
A reaction which takes in energy from surroundings