Chemistry level 9 Quiz

What does the Law of Conservation of Mass state about chemical reactions?

• Mass is created during a chemical reaction.

• Mass is destroyed during a chemical reaction.

• Mass is neither created nor destroyed during a chemical reaction.

• Mass is converted into energy during a chemical reaction.

Which of the following is an example of a synthesis reaction?

• Synthesis

• Decomposition

• Displacement

• Combustion

Which of the following factors does NOT affect the rate of a chemical reaction?

• Temperature

• Concentration

• Colour of reactants

• Surface area of solid reactants

What is the role of a catalyst in a chemical reaction?

• It increases the temperature of the reaction.

• It decreases the concentration of reactants.

• It speeds up the reaction without being consumed.

• It changes the products of the reaction.

Which of the following reactions is exothermic?

• Melting of ice

• Combustion of wood

• Evaporation of water

• Photosynthesis

• Synthesis

• Decomposition

• Displacement

• Neutralisation

Which of the following is a balanced chemical equation?

What is the effect of increasing the surface area of solid reactants on the rate of reaction?

• It decreases the rate of reaction.

• It has no effect on the rate of reaction.

• It increases the rate of reaction.

• It stops the reaction completely.

Which of the following is an endothermic reaction?

• Freezing of water

• Combustion of methane

• Dissolving ammonium nitrate in water

• Rusting of iron