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Alhussan Chemistry — Stage 9

Chapter 10: Structure, Bonding, and Properties

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Chapter 11: Patterns in the Periodic Table

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Chapter 12: Chemical Reactions 3 and Rates

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Chapter 13: Planet Earth and Continental Drift

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Chemistry 12.10 Concentration and reaction rate — Quiz

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  • Questions count: 50
  • Passing grade: B+
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1.
Which term matches this definition? “Collision that leads to reaction.”
Kinetic energy
Effective collision
Powder
Salt
2.
Magnesium in 2 M acid fizzes ____ than in 1 M acid.
not at all
the same
faster
slower
3.
Time for magnesium to dissolve at different acid concentrations. At what value of "Concentration (mol/dm³)" is "Time (s)" greatest?
Dr Dabour Hub Academy - figure 1
1.5
0.5
2.0
1.0
4.
Collisions per second at different concentrations (relative). Which graph shows these results correctly?
Dr Dabour Hub Academy - figure 2
A
B
C
D
5.
More frequent effective collisions give a ____ rate.
faster
equal
zero
slower
6.
True or false? Doubling the volume of the same acid does not change the rate.
True
False
7.
Particles need enough ____ to break bonds.
mass
charge
colour
energy
8.
Rate is 0.5 cm³/s at 0.5 mol/dm³. Predict the rate at 1.5 mol/dm³ if rate ∝ concentration.
0.17 cm³/s
2.00 cm³/s
0.50 cm³/s
1.50 cm³/s
9.
The minimum energy needed is the ____.
potential energy
kinetic energy
activation energy
nuclear energy
10.
True or false? Particles need enough energy to break bonds.
True
False
11.
Which statement is correct?
Dilute acid reacts faster.
The concentrated acid graph is flatter.
Concentration has no effect on collisions.
Higher pressure makes gas reactions faster.
12.
Rate is 1.0 cm³/s at 1.0 mol/dm³. Predict the rate at 1.5 mol/dm³ if rate ∝ concentration.
2.50 cm³/s
0.67 cm³/s
1.50 cm³/s
1.00 cm³/s
13.
Gas volume with acid of different concentrations. At what value of "Time (s)" is "CO2 (cm³)" greatest?
Dr Dabour Hub Academy - figure 3
120
20
40
100
14.
Magnesium took 120 s in weak acid and 30 s in strong acid. How many times faster?
0.2 times
150.0 times
90.0 times
4.0 times
15.
Catalysts are ____ in reactions.
used up
not used up
created
destroyed
16.
Which term matches this definition? “Amount of substance in a volume.”
Concentration
Disappearing cross
Stopwatch
Ore
17.
Rate against acid concentration. At what value of "Concentration (mol/dm³)" is "Rate (cm³/s)" greatest?
Dr Dabour Hub Academy - figure 4
1.0
0.5
2.0
1.5
18.
Which statement is NOT correct?
More frequent effective collisions give a faster rate.
Higher pressure slows gas reactions.
Higher concentration gives more collisions per second.
Higher concentration means more particles in the same volume.
19.
Time for magnesium to dissolve at different acid concentrations. By how much does "Time (s)" change between 0.5 and 2.0?
Dr Dabour Hub Academy - figure 5
150
30
112
90
20.
Gas volume with acid of different concentrations. Between which two values of "Time (s)" did "CO2 (cm³)" change the most?
Dr Dabour Hub Academy - figure 6
60 and 80
100 and 120
0 and 20
80 and 100
21.
Doubling the volume of the same acid ____ change the rate.
always
does not
greatly
does
22.
True or false? Enzymes are biological catalysts.
True
False
23.
Magnesium took 100 s in weak acid and 30 s in strong acid. How many times faster?
130.0 times
70.0 times
0.3 times
3.3 times
24.
True or false? Higher pressure makes gas reactions faster.
True
False
25.
Which statement is correct?
The graph for higher concentration is steeper at first.
Concentration has no effect on collisions.
Higher pressure slows gas reactions.
Catalysts raise activation energy.
26.
True or false? The concentrated acid graph is flatter.
True
False
27.
Which statement is NOT correct?
Enzymes are biological catalysts.
Gas pressure is like concentration for gases.
Collision theory ignores energy.
Magnesium in 2 M acid fizzes faster than in 1 M acid.
28.
Which statement is correct?
The concentrated acid graph is flatter.
Concentration has no effect on collisions.
Enzymes are metals.
Substances react only when particles collide.
29.
Which statement is NOT correct?
Particles in solution move randomly.
Concentration has no effect on collisions.
Particles need enough energy to break bonds.
Higher concentration gives more collisions per second.
30.
Rate is 0.5 cm³/s at 0.5 mol/dm³. Predict the rate at 2.0 mol/dm³ if rate ∝ concentration.
0.50 cm³/s
2.00 cm³/s
0.12 cm³/s
2.50 cm³/s
31.
True or false? Collision theory ignores energy.
True
False
32.
Rate = 1 ÷ time. Time was 40 s. Rate in s⁻¹?
2.500 s⁻¹
0.025 s⁻¹
0.400 s⁻¹
40.000 s⁻¹
33.
True or false? Concentration has no effect on collisions.
True
False
34.
Doubling concentration roughly ____ the rate.
halves
doubles
keeps
stops
35.
Which is the correct definition of “Frequency of collisions”?
Speeds up a reaction without being used up.
How often particles collide.
Minimum energy needed for a reaction.
Low concentration.
36.
Higher concentration gives ____ collisions per second.
equal
no
more
fewer
37.
Rate is 1.0 cm³/s at 1.0 mol/dm³. Predict the rate at 2.0 mol/dm³ if rate ∝ concentration.
0.50 cm³/s
1.00 cm³/s
3.00 cm³/s
2.00 cm³/s
38.
Concentration does not change the ____ if reactants are the same amount.
collision frequency
rate
total gas
speed
39.
Rate is 0.5 cm³/s at 1.0 mol/dm³. Predict the rate at 2.0 mol/dm³ if rate ∝ concentration.
1.00 cm³/s
2.50 cm³/s
0.50 cm³/s
0.25 cm³/s
40.
Which term matches this definition? “Particles must collide with enough energy to react.”
Reactant particles
Symbol equation
Collision theory
Ore
41.
Which statement is NOT correct?
Substances react only when particles collide.
Dilute acid reacts faster.
Dilute acid reacts more slowly than concentrated acid.
The graph for higher concentration is steeper at first.
42.
Which term matches this definition? “Speed of reaction.”
Neutralisation
Excess carbonate
Powder
Rate
43.
Which statement is NOT correct?
The minimum energy needed is the activation energy.
The concentrated acid graph is flatter.
Doubling the volume of the same acid does not change the rate.
Strong bleach is concentrated and acts faster.
44.
In the first 10 s, the concentrated acid made 40 cm³ and the dilute 22 cm³. How many times faster was the concentrated acid?
62.0 times
18.0 times
0.6 times
1.8 times
45.
Gas volume with acid of different concentrations. What is the value of "CO2 (cm³)" when "Time (s)" is 100?
Dr Dabour Hub Academy - figure 7
0
74
80
78
46.
Which statement is correct?
Catalysts are used up.
Higher concentration means more particles in the same volume.
Higher concentration slows the reaction.
Every collision leads to a reaction.
47.
Which is the correct definition of “Concentration”?
More than needed so all acid reacts.
Amount of substance in a volume.
A 10 °C rise roughly doubles the rate.
Balanced equation using formulae.
48.
Which statement is NOT correct?
Gas pressure is like concentration for gases.
Doubling concentration roughly doubles the rate.
More frequent effective collisions give a faster rate.
Catalysts are used up.
49.
True or false? Catalysts are used up.
True
False
50.
Which term matches this definition? “How often particles collide.”
Frequency of collisions
Reactant particles
Rate of reaction
Excess carbonate
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Part of Chapter 12: Chemical Reactions 3 and Rates — see every lesson and quiz in this unit.
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