Rate of Reaction

Question 1

Factors that effect rate of reaction

Answer 1

Temperature
Concentration (pressure)
Surface Area
Catalyst

Question 2

How does temperature effect rate of reaction? (3 points)

Answer 2

-Kinetic energy in particles increases
-More frequent collisions
- More successful collisions

Question 3

How does concentration effect rate of reaction? (2 points)

Answer 3

More particles in the same volume
More frequent collisions

Question 4

How does surface area effect rate of reaction? (2 points)

Answer 4

More particles exposed to react
More (frequent) collisions

Question 5

How does catalyst effect rate of reaction? (1 point)

Answer 5

Lowers activation energy by providing an alternative reaction pathway

Question 6

Chemical reaction

Answer 6

Chemical properties are altered
Compounds are broken up or formed
At least one substance is created
Measurable energy change

Question 7

Physical reaction

Answer 7

Chemical properties do not change
No new substances are formed

Question 8

Particle collisions

Answer 8

Particles must collide for a reaction to take place
They must have a minimum amount of energy for the reaction to take place (activation energy)

Question 9

Activation energy

Answer 9

The minimum energy with which particles must collide in order to cause a chemical reaction.

Question 10

Why are flour mills at risk of large explosions?

Answer 10

Flour particles have a large surface area.
When there are a lot of flour particles in the air, a small spark from an operating machine can cause a reaction between the flour and the spark.
This can result in a dangerous explosion.

Question 11

Why are coal mines at risk of a large explosion?

Answer 11

There many flammable gases in the atmosphere of a coal mine (e.g. methane).
At the correct concentration, these gases produce an explosive mixture with air.
This mixture could cause an explosion, and has caused the death of many miners.