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Collision Theory and Reaction Rates
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Collision Theory and Reaction Rates
Part 1: Check Your Understanding
1. According to collision theory, a reaction occurs when particles:
Move slowly and are close together
Collide with enough energy and the correct orientation
Have the same mass
Stop moving completely
2. Which change usually increases the rate of a reaction between a solid and a solution?
Decreasing the temperature
Using larger pieces of the solid
Increasing the concentration of the solution
Removing the reactants
3. Select all factors that can affect the rate of a reaction.
Temperature
Concentration
Surface area
The colour of the reactants
A catalyst
4. What is the role of a catalyst?
It increases the amount of product made
It provides an alternative pathway with lower activation energy
It is used up during the reaction
It prevents particles from colliding
Part 2: Apply Collision Theory
5. Explain why increasing the temperature generally increases the rate of a reaction.
6. A student reacts marble chips with hydrochloric acid. Explain why powdered marble reacts faster than large marble chips.
7. Complete the sentences.
For a collision to be successful, particles must collide with enough __________ energy and the correct __________.
A faster reaction has more successful collisions per __________.
8. A reaction produces 60 mL of gas in 30 seconds. Calculate its average rate of gas production in mL/s.
9. Design a fair test to investigate how temperature affects the rate of a reaction. State the independent variable, dependent variable and one controlled variable.
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