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WorksheetsCH 4 Chemical Reactions and Systems Quiz
Total questions: 15
Worksheet time: 8mins
What does the temperature of a substance represent?
The average potential energy of the particles
The average kinetic energy of the particles
The total energy of the particles
The chemical energy of the particles
What is the effect of increased kinetic energy on reactant collisions?
Collisions occur less frequently.
Collisions occur more frequently.
Collisions stop occurring.
Collisions become weaker.
What is the effect of increasing the concentration of a reactant in a solution?
It decreases the collision frequency.
It increases the collision frequency.
It has no effect on the collision frequency.
It stops the reaction.
What is a common misconception in collision theory?
All collisions result in a reaction
Frequency and proportion are the same
Temperature does not affect reaction rate
Pressure has no impact on reaction rate
How can the speed of a reaction be measured?
By observing changes in color only
By observing changes in temperature, pH, mass, or color
By measuring the volume of liquid
By counting the number of particles
What is observed when using a balance to measure reaction rates?
Change in color
Change in temperature
Change in mass
Change in volume
Which of the following statements about rates and the collision theory model is true?
Endothermic reactions are always slower than exothermic reactions.
All particles have the same kinetic energy at a fixed temperature.
Reactant particles need to collide with sufficient energy to react.
The rate of a reaction at a constant temperature increases as the reaction proceeds.
Which concentration of HCl showed the slowest bubbling?
0.5 M
1.0 M
1.5 M
2.0 M
Why do nails on the sun-exposed side of a boat rust faster than those on the shaded side?
Higher temperature increases reaction rate
Sunlight prevents rusting
Shaded side is wetter
Sunlight decreases reaction rate
What is a catalyst?
A substance that increases the temperature of a reaction
A substance that provides an alternate reaction pathway with lower activation energy
A substance that decreases the concentration of reactants
A substance that changes the color of a reaction
What factors affect the rate of a chemical reaction?
Temperature, surface area, concentration, gas pressures, presence of a catalyst, activation energy, and orientation
Only temperature and concentration
Only surface area and gas pressures
Only presence of a catalyst and activation energy
What is a common misconception about catalysts?
They increase the percentage yield
They are used up in reactions
They lower activation energy
They are specific to one reaction
What is an example of a heterogeneous catalyst?
Sulfuric acid in esterification
Solid iron in ammonia production
Copper in oxidation of propanone
MnO₂ in oxygen production
Which of the following statements about the use of catalysts in reversible reactions is correct?
decreases the activation energy of the forward reaction only.
increases the activation energy of the forward reaction only.
decreases the activation energy of the forward and reverse reactions.
increases the activation energy of the forward and reverse reactions.
A catalyst for a reaction will
reduce the difference between the energy of the products and the energy of the reactants.
increase the proportion of successful collisions at a given temperature.
require an increase in temperature in order to work successfully.
only work for gaseous reactions.
