C2.4 Rates and Energy Flashcards
What is activation energy?
The minimum energy required to start a chemical reaction
Describe how using smaller marble chips affect the rate of reaction?
Increases surface area
Increases rate of reaction
Explain how using smaller marble chips affect the rate of reaction?
Increases the amount of marble chips exposed
so there are more frequent collisions
Explain how increasing temperature affects the rate of reaction?
Particles move faster
so collide more frequently
increasing the rate of reaction
Explain how increasing concentration affects the rate of reaction?
Particles are more crowded
so collide more frequently
increasing the rate of reaction
How do catalysts affect the rate of reaction?
Lower the activation energy
increasing the rate of reaction
what is an advantage of using a catalyst to speed up a chemical reaction?
Uses less energy
so costs less
produces less carbon dioxide reducing global warming
What is an exothermic reaction?
Transfers energy to the surroundings
What is an endothermic reaction?
Absorbs energy from the surroundings
In a reversible reaction, if the forwards reaction is exothermic, the backwards reaction is….
endothermic.