GCSE Chemistry rates of reaction - catalysts
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Last updated 5 months ago
19 questions
1
Reactions occur when particles ____________ and that rates of reaction are increased when the ______________ and / or energy of collisions is increased.
Other Answer Choices:
frequency
collide
3
Increasing concentration means that there are __________ particles in a given ___________ . This means that the collision ______________ increases so the rate of reaction increases.
Other Answer Choices:
volume
frequency
more
3
Increasing pressure means that there are __________ particles in a given ___________ . This means that the collision ______________ increases so the rate of reaction increases.
Other Answer Choices:
volume
more
frequency
2
Decreasing the size of solid samples e.g. from granule to powder means that the surface _________to volume ratio ______________ , therefore there are more particles of the solid that are available for collisions so collision ______________increases and the rate of reaction increases.
Other Answer Choices:
area
increases
frequency
4
Increasing temperature means that there the particles move more ____________ so they collide more _______________they also have more kinetic energy so they collide more _______________both of these factors _____________ so the rate of reaction.
Other Answer Choices:
forcefully
quickly
frequently
increase
3
A catalyst as a substance that ___________ up the rate of a reaction without altering the products of the reaction, being itself ______________ chemically and in mass at the end of the reaction
Other Answer Choices:
unchanged
speeds
1
Explain how the addition of a catalyst increases the rate of a reaction by providing an ________________ reaction route of __________ activation energy.
Other Answer Choices:
alternative
lower
5
Increases collision frequency | Increases the proportion of the collisions that exceed the activation energy | |
|---|---|---|
Concentration increase | ||
Temperature increase | ||
Adding a catalyst | ||
Making solids finer grained |
1
Recall that enzymes are _______________ catalysts and that enzymes such as __________ are used in the production of alcoholic drinks.
Note enzymes work best at moderate temperatures as ___________ temperatures denature the ___________while __________ temperatures would cause the collision frequency to be decreased and mean that fewer collisions can exceed the activation energy.
Other Answer Choices:
lower
yeast
higher
biological
enzyme
3
Recall the conditions for the Haber process as:
a temperature ________ °C
b pressure ________ atmospheres
c _________ catalyst
Other Answer Choices:
450
200
iron
1
1
1
1
1
1
_______
1
What is the rate of reaction at 3 minutes
_______ cm3 / s
1
What is the rate of reaction at 8 minutes
_______ cm3 / s
1
What is the rate of reaction at 4 minutes
Rate = _______ cm3/s