rate of reaction part 1
TRANSCRIPT
7/27/2019 Rate of Reaction Part 1
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Fast or Slow
• Put the following into order, fastest to
slowest:
– Magnesium reaction with acid
– Neutralisation
– Firework
– Cooking an egg
– Sodium reacting with water
– Rusting
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Rates of Reaction
How can we find out the rate of a reaction?WAL:
C
B
A
Identify factors that affect the rate of reaction
Describe how the rate of a reaction can bemeasured
Analyse data on the rate of a
reaction
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Fast or Slow
• Put the following into order, fastest to
slowest:
– Magnesium reaction with acid
– Neutralisation
– Firework
– Cooking an egg
– Sodium reacting with water
– Rusting
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Fast or Slow
• Put the following into order, fastest to
slowest:
– Rusting
– Cooking an egg
– Neutralisation
– Firework
– Magnesium reaction with acid
– Sodium reacting with water
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What do we mean by ‘rate’?
The rate of a reaction is ‘the timetaken for a product to form, orreactants to be used up’
Q. What do you understandby the term ‘rate of reaction’?
Rate = amount of product produced (reactants used up) / time taken
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REVIEW
Measuring the rate at which _______ are used up or ______ aremade are two ways of measuring the
______ of a chemical reaction. Anexample of a reaction that happensquickly is a ___________ . A
reaction that happens slowly is __________ .
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REVIEW
+magnesiumhydrochloric
acid+
magnesium
chloridehydrogen
Q. How could you measure the rate of thereaction? Include the units you would use?
The amount of hydrochloric acid used up
(cm3/min).
The amount of magnesium chloride produced
(g/min).
The amount of hydrogen product (cm
3
/min).
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Measuring Rate
How could you measure the rate ofthese reactions? Use your definition tohelp you.
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Measuring the decreasing mass of
a reaction
We can measure the
rate at which the
mass of a reaction
mixture changes ifthe reaction gives off
a gas.
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Measuring the increasing volume of
gas produced
If the reaction
produces a gas we
can measure the
volume of gas anduse that information
to find out the rate of
reaction.
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Measuring the decreasing light
passing through a solution
Some reactions
produce an insoluble
precipitate. This
makes the solutiongo cloudy and we can
therefore measure
the rate at which thesolid appears.
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h y d r o g e n p r o d u
c e d ( c m 3 )
time (seconds)
10 20 30 40 50
10
2030
40
50
6070
0
0
Calculating rate of reaction from
graphs
Total volume is 65cm
3
Total time is 38seconds
What is the total volume produced?
What is the time for the reaction to complete?
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Measuring the decreasing light
passing through a solution
Some reactions
produce an insoluble
precipitate. This
makes the solutiongo cloudy and we can
therefore measure
the rate at which thesolid appears.
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Measuring the decreasing mass of
a reaction
We can measure the
rate at which the
mass of a reaction
mixture changes ifthe reaction gives off
a gas.
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h y d r o g e n p r o d u
c e d ( c m 3 )
time (seconds)
10 20 30 40 50
10
2030
40
50
6070
0
0
x
y
Calculating rate of reaction from
graphs
rate of reaction =
x
y
rate of reaction = 20 s
45 cm3 =2.25 cm3 /s
The gradient of the graph is equal to the initial
rate of reaction at that time
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Graphs tell a story.
Sketch these two graphs and write a sentence to
explain what the graph shows you. ( Hint: 2 markerstyles question)
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Question:
Rate = amount of product produce / times takes
= 5 / 25
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Rates of Reaction
How can we fond out the rate of a reaction?WAL:
C
B
A
Identify factors that affect the rate of reaction
Describe how the rate of a reaction can bemeasured
Analyse data on the rate of a
reaction