Question Bank for Grade 8 Science

Which type of chemical reaction has two or more reactants to make one product?

• combustion

• single displacement

• double displacement

• synthesis

• decomposition

• Synthesis (or combination)

• Decomposition

• Single displacement

• Double displacement

• Synthesis

• Decomposition

• Single Replacement

• Double Replacement

• Combustion

• Synthesis

• Decomposition

• Single Replacement

• Double Replacement

• Combustion

• Synthesis

• Decomposition

• Single Replacement

• Double Replacement

• Combustion

• Synthesis

• Decomposition

• Single Replacement

• Double Replacement

• Combustion

Which phrase describes what happens to atoms in a chemical reaction?

• never lost or gained, just rearranged

• sometimes lost, never rearranged

• sometimes lost, gained, or rearranged

• lost or gained, never rearranged

Which of the following is a compound?

• zinc (Zn)

• magnesium (Mg)

• sodium chloride (NaCl)

• potassium (K)

Which of the following is an element?

• potassium chloride (KCl)

• water (H₂O)

• carbon (C)

• calcium carbonate (CaCO₃)

Identify the type of chemical reaction

• Synthesis

• Decomposition

• Single replacement

• Double replacement

• Combustion