Year 9 Science Chapter 5

What is an exothermic reaction? Choose the best answer

• A reaction that releases heat

• A reaction that absorbs heat

• A reaction that releases energy

• A reaction that absorbs energy

What is an endothermic reaction? Choose the best answer

• A reaction that releases energy

• A reaction that absorbs energy

• A reaction that releases heat

• A reaction that absorbs heat

Choose the correct examples of exothermic reactions

• Combustion or Burning Reaction

• Reaction of Metals with Acid

• Reaction of Metals with Air

• Photosynthesis Reaction

• Cell Respiration Reaction

Choose the correct examples of Endothermic reactions

• Reaction of Metals and Acid

• Reaction of Metals and Air

• Photosynthesis Reaction

• Combustion or Burning Reaction

• Reactions of salts inside cold packs

What are the three things needed for combustion (burning)?

• Heat source

• Water

• Oxygen

• Fuel

• Electricity

What are the two REACTANTS for photosynthesis?

• Oxygen and Glucose

• Carbon Dioxide and Water

• Carbon Dioxide and Chlorophyll

• Oxygen and Sunlight

• Carbon Dioxide and Glucose

What are the two PRODUCTS of Photosynthesis?

• Carbon Dioxide and Water

• Glucose and Carbon Dioxide

• Oxygen and Water

• Glucose and Oxygen

• Sunlight and Chlorophyll

What is the difference between a reaction and a process for Chapter 5?

• Reactions are Exothermic only whereas Processes are Endothermic only

• Reactions have to do with physical changes but Processes have to do with chemical changes

• Reactions have to do with checmical changes but Processes have to do with physical changes

• Reactions and Processes are the same

Which of the following processes are Endothermic?

• Freezing

• Melting

• Condensation

• Evaporation

• Boiling

Which of the following processes are Exothermic?

• Evaporation

• Boiling

• Condensation

• Freezing

• Melting