Chemical Reactions Quiz

What are the starting materials in a chemical reaction called?

• Products

• Reactants

• Catalysts

• Enzymes

Which of the following is a sign that a chemical reaction has occurred?

• The substance melts

• New products are made

• The substance is stirred

• The substance is cooled

What is usually released during a chemical reaction that increases the temperature?

• Light energy

• Sound energy

• Thermal energy

• Electrical energy

What is the process of adding oxygen to a substance called?

• Reduction

• Oxidation

• Sublimation

• Condensation

According to the conservation of mass, the mass of the products is the same as the mass of the:

• Reactants

• Catalysts

• Enzymes

• Solvents

What is thermal decomposition?

• A process using thermal energy to break down a large chemical into smaller chemicals

• A process of combining two chemicals to form a larger compound

• A method of cooling substances to form solids

• A technique for mixing chemicals without heat

What are the products of the thermal decomposition of copper carbonate?

• Copper oxide and carbon dioxide

• Copper sulfate and water

• Copper chloride and oxygen

• Copper nitrate and hydrogen

What is neutralisation in chemistry?

• A reaction between an acid and an alkali to form a salt and water

• A process of heating chemicals to form gases

• A method of dissolving metals in acid

• A technique for separating mixtures

What are the products of the reaction between hydrochloric acid and sodium hydroxide?

• Sodium chloride and water

• Sodium carbonate and oxygen

• Sodium sulfate and hydrogen

• Sodium nitrate and carbon dioxide

What are the products formed when a fuel combusts?

• Oxygen and Hydrogen

• Carbon dioxide and Water

• Sulphur dioxide and Nitrogen

• Methane and Ethanol