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Chemistry Revision > Rate Of Reaction > Flashcards

Flashcards in Rate Of Reaction Deck (11):
1

What is a fair experiment?

To insure that your experiment is a fair test, you must change only one factor at a time while keeping all other conditions the same.

2

What does the collision theory state?

The collision theory states that for a reaction to occur, the reacting particles need to collide with each other with sufficient (enough) energy. The required energy is called activation energy.

3

What happens to the rate of reaction as the temperature gets hotter (increases)?

The rate of reaction increases.

4

When a gas is given off during a reaction, It is quite easy to record the progress of the reaction. How can this be done?

You can record the progress of the reaction by measuring the change in mass or by the volume of gas given off.

5

How can you change the rate of reaction?

Temperature, Particle size, concentration, catalysts.

6

When is a reaction at its fastest?

A reaction is always fastest at the start of the reaction. As the reactants concentration decreases, the rate will slow down.

7

Explain how particle size can affect the rate of reaction.

-The smaller the particle size, the higher the surface area.
-The higher the surface area, the greater the number of collisions that can occur.
-The greater the number of collisions, the faster the reaction.
-Therefore the smaller the particle size, the faster the reaction rate.

8

Explain how concentration can affect the rate of reaction.

When there are only a few molecules, there are only a few collisions and the rate of reaction is low.
When there are many molecules, there are more collisions and the rate of reaction is greater.

9

Explain how temperature can affect the rate of reaction.

The higher the temperature the faster the particles will move because its creating energy. This means that they will collide more often with the other particles so the reaction will be quicker.

10

Explain rate of reaction graphs.

When a reaction gives off gas, the rate of reaction can be worked out. This can be done by either recording the volume of gas given off every minute (or 30 seconds), or by recording the remaining mass of the remaining mixture. As a reaction proceeds, the rate of reaction will decrease (slows down) and can be shown on a graph.

11

What is the average rate of reaction formula.

Rate = delta quantity / delta time