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c5-monitoring and controlling reactions
controlling reactions
rate of reaction practicals
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Created by
Amelia Archibald
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Cards (21)
What is the independent variable in the gas production experiment?
Surface area
of marble chips
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How does changing the surface area affect the rate of reaction?
It alters the amount of
gas produced
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What should be done with the measuring cylinder before starting the experiment?
Fill it with
water
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What is the dependent variable in the gas production experiment?
Volume of gas produced
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What is the purpose of starting the timer in the experiment?
To measure the time for
gas production
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How often should the volume of gas produced be recorded?
Every
5 seconds
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What should be plotted on the graph after recording data?
Time
against
volume of gas
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What is the next step after plotting the graph?
Draw a
curve of best fit
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How can the rate of reaction be determined from the graph?
By calculating the
gradient
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What is the procedure for measuring gas production in the reaction?
Set up equipment with a full measuring cylinder.
Place a known mass of
marble chips
.
Pour in a known
concentration
and excess volume of
acid
.
Start the
timer
.
Record
gas volume
every 5 seconds.
Plot time against gas volume.
Draw a
curve of best fit
.
Calculate the
gradient
for
rate
.
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What reaction is observed to study the rate of reaction?
Reaction between
sodium thiosulfate
and
hydrochloric acid
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How does changing concentration affect the rate of reaction?
It affects the rate by changing the
colour
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What is the procedure for observing a colour change in this experiment?
Set up
equipment
with an 'x' visible.
Place solutions (except
acid
) in beakers.
Pour in acid (
independent variable
) and start the stop clock.
Stop the clock when the cross is not visible (dependent variable).
Repeat with different acid
concentrations
.
Plot a graph of time against acid concentration.
Draw a line of best fit.
Calculate the
gradient
for rate changes.
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What is the independent variable in this experiment?
Concentration
of
hydrochloric acid
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What is the dependent variable in this experiment?
Time taken
for the cross to disappear
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What should be done after repeating the experiment with different concentrations?
Plot a
graph
of
time
against concentration
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What does calculating the gradient of the graph indicate?
How the rate changes per increase in
concentration
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What should be visible under the reaction vessel during the experiment?
An
'x' on
a
sheet
of
paper
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What is the first step in the experimental setup?
Set
up
equipment
with
an
'x'
visible
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Why is it important to repeat the experiment with different concentrations?
To observe how concentration affects the
rate
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What is the significance of drawing a line of best fit on the graph?
It helps visualize the relationship between
variables
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