G3 Science (Chemistry) Rate of Reactions · question set

Try K326/K328 Rate of Reactions exam-style questions. Covers rate measurement and data plus concentration, gas pressure, particle size and temperature through particle collisions. Catalyst and activation-energy questions are not selected.

SEC G3 Combined Science Chemistry component 2027

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Which definition of rate (speed) of reaction is mark-scheme correct?

How quickly a reaction finishes
Change in amount of reactant used up or product formed per unit time
How much product is made in total
The time taken for a reaction to start

A reaction produces 48 cm³ of gas in 60 s. What is the average rate in cm³/s?

0.80
1.25
8.0
2880

A reaction produces 24 cm³ of gas in 2.0 minutes. What is the average rate in cm³/s?

0.20
0.12
12
48

Two experiments produce the same total volume of gas. Which has the higher initial rate?

The one with the steeper initial gradient on the volume–time graph
The one with the higher final volume of gas
The one that uses more water as solvent
Cannot be determined from a graph

A gas syringe reading increases from 10 cm³ at 20 s to 34 cm³ at 50 s. What is the average rate between 20 s and 50 s?

0.80 cm³/s
1.25 cm³/s
24 cm³/s
44 cm³/s

A gas syringe reading increases from 12 cm³ at 20 s to 42 cm³ at 50 s. What is the average rate between 20 s and 50 s?

0.50 cm³/s
1.0 cm³/s
1.5 cm³/s
30 cm³/s

A student calculates gradient using two points very close together on the tangent line. Why is this a poor method?

It makes the gradient always too large
It increases percentage uncertainty from reading errors on the graph
It changes the units of gradient
It forces the tangent to become curved

When comparing the effect of concentration on rate, which control variables are most important?

Keep temperature and the surface area/mass of solid (if present) the same
Keep the beaker colour the same
Keep the stopwatch brand the same only
Keep the final volume of gas the same

A reaction involves a solid reactant. Which keyword is the correct factor for rate questions?

Particle size
Surface area
Mass
Density

Which change would increase the rate of a reaction between two solutions (no gases involved)?

Decrease pressure
Increase pressure
Increase concentration of one solution
Use a smaller beaker

Which factor normally leaves the rate of a solid–solution reaction unchanged when no gas is involved?

Surface area
Concentration
Temperature
Pressure

Which factor most directly increases rate for reactions between gases (at constant temperature)?

Increase pressure
Decrease surface area
Decrease concentration
Use a larger beaker

G3 Science (Chemistry) Rate of Reactions · question set

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