Chemical Reactions

• photosynthesis

• respiration

• corrosion

• combustion

• photosynthesis

• respiration

• corrosion

• combustion

• photosynthesis

• respiration

• corrosion

• combustion

Which of the following substances is considered non-flammable?

• Hydrogen gas

• Paraffin wax

• Fibreglass

• Petrol

Which of the following substances is highly flammable and is used to power rockets, because it is highly explosive?

• Hydrogen gas

• Paraffin wax

• Fibreglass

• Petrol

What is the name of the chemical that makes leaves green, and captures sunlight to start photosynthesis in plants?

• chlorine

• carbon dioxide

• chlorophyll

• oxygen

A starting substance in a chemical reaction is known as a ...?

• product

• reactant

• solution

• solute

Which of the following is an example of a physical change that causes a permanent colour change, but does not involve a chemical change?

• boiling water

• evaporation

• mixing paint

• recrystallization

The substances formed in a chemical reaction are known as......?

• products

• reactants

• solutions

• solutes

Which of the following is an example of a physical change that might increase or decrease the temperature, but does not involve a chemical change?

• mixing paint

• boiling water

• recrystallization

• evaporation