C7- Energy Changes

C7.1- Which of these correctly describes an exothermic reaction?

• A reaction that takes energy from the surroundings

• A reaction that releases heat into the surroundings

• A reaction that does not affect its surroundings

• A reaction done in a polystyrene cup

C7.1- Which of these correctly describes an endothermic reaction?

• A reaction that takes energy from the surroundings

• A reaction that releases heat into the surroundings

• A reaction that does not affect its surroundings

• A reaction done in a polystyrene cup

C7.1- How can you tell a reaction is endothermic?

• Because the colour changes

• Because the reaction effervesces

• Because the temperature of the solution increases

• Because the temperature of the solution decreases

C7.1- How can you tell a reaction is exothermic?

• Because the colour changes

• Because the reaction effervesces

• Because the temperature of the solution increases

• Because the temperature of the solution decreases

C7.1- Which of these is NOT a measurement that needs to be made when investigating the energy change of a reaction?

• Starting temperature

• Final temperature

• Mass of reactants

• Temperature of surroundings

C7.1- Why do we measure energy changes of endothermic reactions in polystyrene cups?

• To minimise energy loss to the surroundings

• To minimise energy gain from the surroundings

• To make sure the reaction releases all of its energy

• To stop air getting in

C7.2- Which of these is NOT an exothermic reaction?

• Self-heating can

• Hand warmer

• Combustion

• Photosynthesis

C7.2- Which of these is NOT an endothermic reaction?

• Photosynthesis

• Sports injury pack

• Dissolving ammonium chloride

• Respiration

C7.2- Which letter represents the endpoint of the titration in the graph?

• A

• B

• C

• D

C7.2- Why is the temperature increasing at point A?

• Energy is gained from the surroundings

• The reaction is exothermic

• The reaction is endothermic

• There is a bunsen burner being used