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chemistry paper 2
rates of reaction and energy changes
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grace kennedy
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Cards (25)
What is one way to follow a reaction?
By looking at the
loss of mass
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What happens to mass when a gas is produced in a reaction?
The mass will
decrease
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How can gas be collected during a reaction?
Using a
syringe
or
inverted measuring cylinder
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What are the units for measuring the rate of reaction when using volume and time?
Centimeters cubed per minute
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What is the second unit for measuring the rate of reaction?
Grams
per second
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How do you find the rate of reaction at a specific point on a graph?
By drawing a
tangent
at that point
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What does a steep tangent indicate about the rate of reaction?
It
indicates
a
fast
rate
of
reaction
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What color change indicates a reaction between sodium thiosulfate and hydrochloric acid?
From
clear colorless
to
opaque
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What is a major health concern when conducting the sodium thiosulfate reaction?
It
can
irritate
your
hands
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Why should the same person measure the rate of reaction in the color change experiment?
To avoid differences in
perception
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What is a potential error when collecting gas in a measuring cylinder?
Gas
already
present
in the
cylinder
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How does the rate of reaction change with powdered calcium carbonate compared to large marble chips?
It reacts much faster with powdered form
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How does temperature affect the rate of reaction?
Higher
temperature
increases
the rate
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What happens to particles at higher temperatures during a reaction?
They
move
faster
and
collide
more
often
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How does surface area affect the rate of reaction?
Larger
surface area
increases
the rate
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What is the effect of high pressure or concentration on the rate of reaction?
It increases the rate of reaction
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What is the role of a catalyst in a reaction?
It lowers the
activation energy
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What is the difference between endothermic and exothermic reactions?
Endothermic absorbs
energy
; exothermic releases energy
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How does a catalyst affect the activation energy of a reaction?
It
lowers
the
activation
energy
required
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What is the energy change in an endothermic reaction?
Energy
is taken in
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What is the energy change in an exothermic reaction?
Energy is
given out
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How do you calculate the energy change during a reaction?
By considering
bond energies
of
reactants
and
products
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What is the balanced equation for burning hydrogen in oxygen?
2H₂
+ O₂ →
2H₂O
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What is the significance of a negative energy change in a reaction?
It indicates an
exothermic
reaction
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What should you practice for the exam regarding calculations?
Energy change
calculations
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