Chemical Reactions Quiz

Which of the following statements is true regarding the Law of Conservation of Mass?

• The total mass of reactants is always greater than the total mass of products.

• Matter can neither be created nor destroyed in a chemical reaction.

• The total mass of reactants is always equal to the total mass of products.

• The total mass of products is always greater than the total mass of reactants.

In a chemical reaction, the substances present at the start are called:

• Reactants

• Products

• Catalysts

• Solvents

The decomposition of a substance by passing an electric current through it is called:

• Electrolysis

• Photosynthesis

• Combustion

• Oxidation

Which of the following statements is true regarding a neutralization reaction?

• It involves the reaction of an acid with a metal.

• It involves the reaction of an acid with a base to form salt and water.

• It involves the decomposition of a compound by passing electricity through it.

• It involves the reaction of a metal with an acid to produce hydrogen gas.

In the reaction, 2KClO₃ → 2KCl + 3O₂, what type of reaction is occurring?

• Combination reaction

• Decomposition reaction

• Displacement reaction

• Double displacement reaction

What type of reaction occurs when calcium carbonate decomposes upon heating to form calcium oxide and carbon dioxide?

• Combination reaction

• Decomposition reaction

• Displacement reaction

• Precipitation reaction

What is the name given to the reaction between an acid and a base?

• Neutralization reaction

• Combustion reaction

• Oxidation reaction

• Reduction reaction

The decomposition of hydrogen peroxide into water and oxygen is catalyzed by:

• FeCl₃

• MnO₂

• Zn

• CuSO₄

Which of the following is NOT a chemical reaction?

• Burning of coal

• Boiling of water

• Rusting of iron

• Digestion of food

When a magnesium ribbon is burnt in air, the product formed is:

• Magnesium hydroxide

• Magnesium oxide

• Magnesium chloride

• Magnesium sulphate