Assignment on 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 breakdown of food substances to release energy is known as

• digestion

• combustion

• respiration

• excretion

Which of the following processes provides all the energy needed for every other process taking place in our bodies?

• Respiration

• Burning

• Explosion

• Breathing

A combustion process which leads to the generation of flame is specially called

• flaming

• explosion

• respiration

• burning

The two main products of combustion are

• carbon dioxide and water

• carbon dioxide and oxygen

• hydrogen and oxygen

• water and fuel

Why is it that both combustion and respiration are referred to as oxidation processes?

• The two processes give out energy

• Fuel is needed in the two processes

• The two processes happen in the human body

• Oxygen combines with another substance in the two processes

Which of the following is not an element of fire?

• Water

• Fuel

• Oxygen

• Heat

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

The substance formed when oxygen combines with carbon is

• water

• carbon dioxide

• ozone

• carbon sulphide