Topic Overview - Energy Changes and Rates of Reaction

#1. Reaction profiles are used to show the energy transfers during reactions. Which type of reaction is shown in this reaction profile?

Ectothermic

Mesothermic

Exothermic

Endothermic

#2. When there are more frequent collisions between particles, what will happen to the rate of reaction?

It will decrease

It will stay the same

It will increase

#3. Will endothermic reactions continue if there is no energy input?

No, even if there are still reactants

Yes, until reactants run out

#4. Does increasing the pressure of gases increase the rate of reaction?

Yes

No

Sometimes

#5. In which type of reaction would the temperature of a solution increase?

Exothermic

Endothermic

#6. Temperature affects the rate of reaction. Which of the following is the correct description of what happens when temperature changes?

As temperature increases, rate of reaction increases

As temperature increases, rate of reaction decreases

#7. Iron is turned into iron oxide when exposed to the air. This is a process also known as rusting. Is the rate of reaction fast or slow in rusting?

Fast

Slow

#8. Which type of reaction takes in energy, making the surroundings cooler?

Exothermic

Endothermic

Ectothermic

#9. How could we accurately monitor the rate of a reaction? ? Three answers

Select all that apply:

By measuring the concentration of reactants and products throughout a reaction

By measuring the changes in volume of reactants and products

By measuring the changes in mass of reactants and products

By measuring the temperature throughout a reaction

#10. Why is there a minimum energy required for reactions to occur?

High collision energies are more likely to break chemical bonds

High energies cause spontaneous rearrangement of particles without impacts between them

#11. Chemical reactions require a high enough collision energy for reactions to take place. What do we call the minimum amount of energy needed for a reaction?

The Introactive energy minimum

Activation energy

Reactionary energy

PR energy

#12. Which type of reaction transfers energy to the surroundings?

Endothermic

Exothermic

Mesothermic

#13. Is it possible to control the rate of reaction?

No

Yes

#14. Energy is transferred between the environment and reactants during a chemical reaction. What form is this energy usually in?

Thermal

Electrical

Chemical

#15. Neutralisation reactions which occur between an acid and a base are always:

Exothermic

Endothermic

#16. True or false - Precipitation reactions can either exothermic or endothermic.

True

False

#17. Surface area to volume ratio affects rate of reaction. Why is that the case?

With higher surface area to volume ratio, there is more surface where collisions can take place

With lower surface area to volume ratio, objects are much hotter and travel faster

With higher surface area to volume ratio, the overall temperature of reactants is lower, this leads to increased collision impact when struck

#18. Which of these describes the term "rate of reaction"?

The rate of temperature change in the surroundings

The speed at which reactants are turned into products

The number of particles involved in a reaction in 1 minute

#19. In an experiment to measure the rate of photosynthesis of pondweed in a test tube, the number of bubbles (oxygen) produced per minute is used to determine the rate of reaction. What is this experiment actually measuring?

The volume of the reactants of the reaction

The concentration of the products of the reaction

The volume of the products of the reaction

The mass of the products of the reaction

The mass of the reactants of the reaction

#20. Which type of reaction is aerobic respiration?

Exothermic

Endothermic

Mesothermic

Ectothermic

#21. Why is a spark often needed to start a combustion reaction?

It provides the activation energy needed

It releases electrons from their shells and they rapidly ignite the fuel

#22. Which of these reasons explains why temperature affects rate of reaction?

Reactant particles at higher temperatures move more quickly, collide more often and with enough energy to react

Reactant particles at lower temperatures are struck by rapidly moving electrons, causing the reaction to happen faster

Reactant particles are unaffected by temperature, but the bonds at higher temperatures become weaker leading to an increased rate of reaction

#23. Displacement reactions sometimes occur between a metal and a compound of a less reactive metal. Are these reactions endothermic or exothermic?

Endothermic

Exothermic

#24. Which of the following are problems that would arise from measuring an extremely slow rate of reaction?

Select all that apply:

Very small changes are difficult to accurately measure

Extremely slow reactions do not always follow the law of conservation of energy

Very slow changes require long-term experiments - costly and may exceed human lifetimes

#25. Which of these is a fast reaction?

Photosynthesis

Rusting

Explosions

#26. Increasing the concentration of solutions increases the rate of reaction, why is this the case?

More collisions take place because there are more particles in the same volume

When solutions are more concentrated, the intermolecular forces become weaker and bonds are more easily broken

#27. Will exothermic reactions continue if there is no energy input?

No, even if reactants have not run out

Yes, until reactants run out

#28. Reaction profiles are used to show the energy transfers during reactions. Which type of reaction is shown in this reaction profile?

Ectothermic

Mesothermic

Endothermic

Exothermic

#29. Which type of reaction is photosynthesis?

Endothermic

Exothermic

Ectothermic

Topic Overview - Energy Changes and Rates of Reaction

Good Luck!

Results

#1. Reaction profiles are used to show the energy transfers during reactions. Which type of reaction is shown in this reaction profile?

#2. When there are more frequent collisions between particles, what will happen to the rate of reaction?

#3. Will endothermic reactions continue if there is no energy input?

#4. Does increasing the pressure of gases increase the rate of reaction?

#5. In which type of reaction would the temperature of a solution increase?

#6. Temperature affects the rate of reaction. Which of the following is the correct description of what happens when temperature changes?

#7. Iron is turned into iron oxide when exposed to the air. This is a process also known as rusting. Is the rate of reaction fast or slow in rusting?

#8. Which type of reaction takes in energy, making the surroundings cooler?

#9. How could we accurately monitor the rate of a reaction? ? Three answers

#10. Why is there a minimum energy required for reactions to occur?

#11. Chemical reactions require a high enough collision energy for reactions to take place. What do we call the minimum amount of energy needed for a reaction?

#12. Which type of reaction transfers energy to the surroundings?

#13. Is it possible to control the rate of reaction?

#14. Energy is transferred between the environment and reactants during a chemical reaction. What form is this energy usually in?

#15. Neutralisation reactions which occur between an acid and a base are always:

#16. True or false - Precipitation reactions can either exothermic or endothermic.

#17. Surface area to volume ratio affects rate of reaction. Why is that the case?

#18. Which of these describes the term "rate of reaction"?

#19. In an experiment to measure the rate of photosynthesis of pondweed in a test tube, the number of bubbles (oxygen) produced per minute is used to determine the rate of reaction. What is this experiment actually measuring?

#20. Which type of reaction is aerobic respiration?

#21. Why is a spark often needed to start a combustion reaction?

#22. Which of these reasons explains why temperature affects rate of reaction?

#23. Displacement reactions sometimes occur between a metal and a compound of a less reactive metal. Are these reactions endothermic or exothermic?

#24. Which of the following are problems that would arise from measuring an extremely slow rate of reaction?

#25. Which of these is a fast reaction?

#26. Increasing the concentration of solutions increases the rate of reaction, why is this the case?

#27. Will exothermic reactions continue if there is no energy input?

#28. Reaction profiles are used to show the energy transfers during reactions. Which type of reaction is shown in this reaction profile?

#29. Which type of reaction is photosynthesis?

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