Question 1: In a chemical reaction, what are the substances that are initially present and undergo a transformation?

• Products
• Reactants (Correct answer)
• Leftovers
• Catalysts

Correct answer: Reactants

Reactants are the starting materials in a chemical reaction that undergo change to form products.

Question 2: What is the term used for substances that are formed as a result of a chemical reaction?

• Reactants
• Catalysts
• Products (Correct answer)
• Leftovers

Correct answer: Products

Products are the substances formed from the chemical reaction of the reactants.

Question 3: If a reaction has leftover substances after the products have formed, what are these leftovers typically referred to as?

• Reactants
• Products
• Excess reactants (Correct answer)
• Byproducts

Correct answer: Excess reactants

Excess reactants are the leftover substances that remain after the reaction has used up the limiting reactant to produce products.

Question 4: In a chemical reaction, what determines the amount of product formed?

• The amount of excess reactant
• The limiting reactant (Correct answer)
• The temperature
• The amount of leftover product

Correct answer: The limiting reactant

The limiting reactant is the substance that is completely consumed first, determining the maximum amount of product that can be formed.

Question 5: What happens to the reactants during a chemical reaction?

• They increase in mass

Reactants undergo a chemical change during the reaction and are transformed into products.