TYPES OF CHEMICAL REACTION AND LAW OF CONSERVATION OF MASS

When methane burns in oxygen, carbon dioxide and water are made. Which is a reactant?

• Oxygen

• Carbon dioxide

• Water

Copper oxide and carbon dioxide are made when copper carbonate is heated strongly. Which is a product?

• Heat

• Copper carbonate

• Copper oxide

What name is given to the force that holds atoms together in a compound?

• Chemical bond

• Gravity

• Electrostatic attraction

What is another name for combustion?

• Reduction

• Burning

• Displacement

• Decomposition

Combustion reactions always release energy. What word can be used to describe them?

• Endothermic

• Exothermic

• Reversible

• Irreversible

Which of these is found in the fire triangle and is therefore essential for combustion?

• Oxygen

• Water

• Carbon dioxide

What is a hydrocarbon?

• A compound that contains carbon and hydrogen

• A compound made from carbon and hydrogen only

• compound that has been obtained from crude oil

What is produced when a hydrocarbon fuel burns in a very good supply of oxygen?

• Carbon monoxide and water

• Carbon and water

• Carbon dioxide and water

Which type of combustion releases the most energy?

• Complete combustion

• Incomplete combustion

• Thermal decomposition

What name is given to a substance that speeds up a reaction without being used up or chemically changed?

• Reducing agent

• Catalyst

• Oxidising agent