Chemistry in everyday life

Which is a common reactant in both respiration and combustion?

• Glucose

• Carbon dioxide

• Oxygen

• Water

A sudden increase in volume which leads to the release of both energy and gases is called

• combustion

• respiration

• burning

• explosion

The two main products of combustion are

• carbon dioxide and water

• carbon dioxide and oxygen

• hydrogen and oxygen

• water and fuel

Why do coal dust particles react faster with oxygen when warmed up than large pieces of coal?

• They are gases

• They have higher temperature

• They have greater surface area

• They are lighter in weight or mass

Which of the following are the observations during a chemical reaction?

• Change of pH

• Change of temperature

• Formation of precipitate

• All the above

Calcium carbonate --> Calcium oxide +_______

• carbon

• carbon dioxide

• oxygen

• calcium

"Copper carbonate --> Copper oxide +carbon dioxide". What reaction is this?

• Neutralization

• Combustion

• Thermal decomposition

• Respiration

"Sulfuric acid + Sodium hydroxide --> sodium sulfate + water". What kind of reaction is this?

• Respiration

• Combustion

• Neutralization

• Thermal decomposition

The word equation for combustion is: fuel + oxygen --> water + ________ __________

• Carbon dioxide
• Limewater

What is essential for a combustion reaction to begin?

• Carbon dioxide
• Fuel 
• Fuel, oxygen and heat
• Water and oxygen