Chemical Reactions Quiz

What is a chemical reaction?

• A process where substances undergo a physical change
• A process where a set of substances undergo a chemical change to form a different substance
• A process where substances are mixed without any change
• A process where substances are separated without any change

Which of the following is NOT an example of a chemical reaction?

• Metal rusting
• Wood burning
• Mixing sand and water
• Photosynthesis in plants

What is the role of reactants in a chemical reaction?

• They are the substances produced by the reaction
• They are the substances that are consumed or used up during the reaction
• They are the catalysts that speed up the reaction
• They are the substances that remain unchanged

Which of the following is a sign of a chemical reaction?

• Change in shape
• Change in temperature
• Change in size
• Change in texture

How can the reaction rate be increased?

• By decreasing the concentration of reactants
• By adding a catalyst
• By increasing the particle size
• By lowering the temperature

What is a product in a chemical reaction?

• A substance that is consumed during the reaction
• A substance that is produced by the reaction
• A catalyst that speeds up the reaction
• A reactant that remains unchanged

What is the effect of increasing the concentration of reactants on the reaction rate?

• It decreases the reaction rate
• It increases the reaction rate
• It has no effect on the reaction rate
• It stops the reaction

Which of the following is NOT a sign of a chemical reaction?

• Formation of a gas
• Change in color
• Change in mass
• Odor production

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

• It is consumed during the reaction
• It speeds up the reaction without being consumed
• It slows down the reaction
• It is a product of the reaction

What is the primary difference between a reactant and a product in a chemical reaction?

• Reactants are consumed, products are formed
• Reactants are formed, products are consumed
• Reactants are catalysts, products are not
• Reactants are always gases, products are always solids