S3 chemistry unit 1 topic 1

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  • Created by: Robert
  • Created on: 08-11-14 15:33
4 factors that can affect the rate of a chemical rection
Particle size, Concentration, Temperature and Catalyst
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Describe the collision theory
Before substances can react the particles must collide with each other
2 of 18
What affect does decreasing the particle size have on rate of reaction
The substance area will be much greater and there will be a greater chance that particles can collide and react. Therefore more collisions per second
3 of 18
Give an example reaction when changing the particle size can affect the rate of reaction
Marble chips and acid experiment
4 of 18
Describe why increasing the concentration results in an increasing in reaction rate
There is more particles of solute (solid) particles in a given volume of solvent (liquid). The more particles the higher the concentracion
5 of 18
How does temperature affect reaction rate
As the temperature increases, the time taken for the reaction decreases and the rate of reaction increases
6 of 18
What is a catalyst
A catalyst is a substance that speeds up a reaction without being changed or used up
7 of 18
What happens to the rate if the time taken for a reaction decreases
The rate increases
8 of 18
What is the relationship between time and rate in a chemical reaction
the quicker the rate the shorter the reaction time
9 of 18
Name 4 ways that a chemical reaction could be followed to work out how fast the reaction is proceeding
volume of gas produce, the Ph solution, the concentration, the colour
10 of 18
What is the formula used to calculate average rate of reaction
Average rate = Quantity ÷ time
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What is the rate if 5g is lost in 10 seconds
Average rate = Quantity ÷ time, 5 ÷ 10 = 0.5gs-1
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How can you tell from looking at a graph that the reaction is faster at the beginning
Because there has been more collisions at the start the curve/line will go up a higher slope than at the end
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How would you recognise the point on a graph when the reaction has just finished
the line will go in a straight line
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What is the units for a change in mass
g
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What is the units for a change in volume
cm3
16 of 18
What thing do you need to remember when drawing a scatter/line graph
Labels, scale, best fit line, use a ruler
17 of 18
What is the rate if 59-49cm3 is lost in 10-20s seconds
Average rate = Quantity ÷ time, 59-45÷20-10, 14÷10 = 1.4cm3s-1
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Other cards in this set

Card 2

Front

Describe the collision theory

Back

Before substances can react the particles must collide with each other

Card 3

Front

What affect does decreasing the particle size have on rate of reaction

Back

Preview of the front of card 3

Card 4

Front

Give an example reaction when changing the particle size can affect the rate of reaction

Back

Preview of the front of card 4

Card 5

Front

Describe why increasing the concentration results in an increasing in reaction rate

Back

Preview of the front of card 5
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