Chemistry 2 Unit 4
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How can the rate of a chemical reaction be found?
Amount of reactant used➗time
amount of product formed➗time
What's the only way chemical reactions take place?
Chemical reactions can only occur when reacting particles collide with each other with the sufficient energy
What is meant by activation energy?
This is the minimum amount of energy particles need to react
What factors can increase the chance of collision (rate of reaction)? (TCPSC)
Concentration of solutions
Pressure of gasses
Surface area of solids
How does increasing the surface area increase the rate of reactions?
Increasing the surface area of solid reactants increases the frequency of collisions
How does increasing the temperature increase the rate of reactions?
Increasing the temperature increases the speed of the reacting particles so they collide more frequently and energetically
How does increasing the pressure increase the rate of reactions?
Increasing the pressure of reacting gasses increase the frequency of collisions
How does increasing the concentration increase the rate of reactions?
Increasing the concentration of reactants in solutions increase the frequency of collisions
How does using a catalyst increase the rate of reactions?
Catalysts change the rate of chemical reactions but are not used up during the reaction
Why are catalysts important in industrial processes?
To reduce the cost
What is meant by an exothermic reaction?
This is when heat energy is release and the surroundings become hotter and the temperature rises
What is meant by an endothermic reaction?
This is when heat energy is taken from the surroundings and the surroundings become colder the temperature decreases
Give an example of an exothermic reaction and everyday uses?
Give an example of an endothermic reaction and an everyday use?
How does Exo/endothermic reactions relate to reversible reactions?
One way is exothermic the other is endothermic the amount of energy is exactly the same for each one
Chemistry 2 Unit 4
Rates and energy