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Course: Edexcel Linear – OL (Chemistry)
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Edexcel Linear – OL (Chemistry)

1. Principles of Chemistry

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2. Inorganic Chemistry

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3. Physical Chemistry

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4. Organic Chemistry

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Quiz

3b Rates of reaction – Exam questions

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  • Questions count: 10
  • Passing grade: B+
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1.
In the reaction A → B, the concentration of A decreases from 0.80 M to 0.40 M in 20 s. What is the average reaction rate?
-0.02 M/s
0.04 M/s
0.02 M/s
0.4 M/s
2.
A student designs an experiment to study the effect of surface area on the rate of reaction of marble (CaCO3) with HCl, using large chips once and powder once. Which must be kept constant (controlled variables)?
Acid concentration, temperature and mass of marble
Volume of CO2 released per minute
Particle size of the marble
Time for the reaction to finish
3.
When lighting a campfire, people start with small thin twigs rather than a large log. Which factor affecting reaction rate explains this?
Increased concentration
Adding a catalyst
Raising the temperature only
Increased surface area exposed to oxygen
4.
Which of the following actions differs from the others in its effect on reaction rate?
Lowering the temperature
Grinding the solid reactant
Increasing the reactant concentration
Adding a suitable catalyst
5.

Which change increases the rate of reaction?

Increasing the temperature
Using larger lumps of solid
Diluting the solution
Lowering the pressure of gases
6.

The rate of a reaction producing a gas can be followed by measuring

the volume of gas produced over time
the colour of the gas
the mass of catalyst
the pH only
7.
Increasing temperature increases reaction rate mainly because:
activation energy decreases
more particles have energy at least equal to Ea
ΔH becomes more negative
the reaction becomes exothermic
8.
What are the units of rate of reaction?
mol dm−3
s−1
mol dm−3 s−1
dm3 mol−1 s−1
9.
Which statement best describes Rate of reaction?
A curve showing the spread of molecular energies in a gas sample at a given temperature.
The change in concentration of a reactant or product per unit time, usually in mol dm−3 s−1.
A substance that increases the rate of reaction by providing an alternative pathway with lower activation energy, and is regenerated at the end.
The rate at the very start of a reaction, found from the gradient of the tangent to a concentration–time graph at t = 0.
10.
Which statement best describes Reaction rate?
Speeds a reaction by providing a lower-Ea pathway; not consumed.
The slowest step in a mechanism.
Change in concentration per unit time.
Minimum energy needed for a reaction.
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Part of 3. Physical Chemistry — see every lesson and quiz in this unit.
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