7.3 Chemical Reactions 2

What is combustion?

• Combustion is a chemical reaction that involves burning with nitrogen to release light and heat.

• Combustion is a chemical reaction that involves burning without oxygen to release light and heat.

• Combustion is a chemical reaction that involves burning with oxygen to release light and heat.

• Combustion is a chemical reaction that involves burning with carbon dioxide to release light and heat.

How has combustion been important throughout human history?

• Combustion has had no significant impact on human history.

• Combustion was only important for cooking and heating purposes.

• Combustion has only been important for running cars and aircraft.

• Combustion was important to run factories and steam engines during the Industrial Revolution.

What is flammability?

• Flammability describes how easily a substance undergoes combustion (burns).

• Flammability describes the process of removing oxygen from a substance.

• Flammability describes the process of converting substances into gases.

• Flammability describes the process of converting substances into solids.

Give an example of a highly flammable substance.

• Paraffin wax.

• Fibreglass.

• Petrol.

• Hydrogen gas.

What is photosynthesis?

• Photosynthesis is a series of chemical reactions that use sunlight to convert water and carbon dioxide into oxygen and glucose.

• Photosynthesis is a series of chemical reactions that use sunlight to convert oxygen and glucose into water and carbon dioxide.

• Photosynthesis is a series of chemical reactions that use heat to convert water and carbon dioxide into oxygen and glucose.

• Photosynthesis is a series of chemical reactions that use sunlight to convert water and glucose into oxygen and carbon dioxide.

Why do plants require chlorophyll for photosynthesis?

• Chlorophyll captures the sunlight required to start the chemical reaction of photosynthesis.

• Chlorophyll helps plants absorb carbon dioxide from the soil.

• Chlorophyll helps plants release energy during photosynthesis.

• Chlorophyll helps plants convert glucose into oxygen.

What is respiration?

• Respiration is the process that converts carbon dioxide and water vapor into oxygen and glucose, while releasing energy.

• Respiration is the process that converts water and glucose into carbon dioxide and oxygen, while releasing energy.

• Respiration is the process that converts carbon dioxide and oxygen into water vapor and glucose, while releasing energy.

• Respiration is the process that converts oxygen and glucose into carbon dioxide and water vapor, while releasing energy.

How does respiration provide energy to living things?

• Respiration provides energy only for physical activities.

• Respiration provides energy for plants but not for animals.

• Respiration provides the energy for living things to live, grow, move, and think.

• Respiration provides energy for thinking but not for physical activities.

What is corrosion?

• Corrosion is a chemical reaction that can cause damage to metals, resulting in the formation of rust.

• Corrosion is a chemical reaction that can cause damage to plastics.

• Corrosion is a chemical reaction that can cause damage to liquids.

• Corrosion is a chemical reaction that can cause damage to flammable substances.