Air and Water IGCSE

What is the main component of air?

• Oxygen

• Argon

• Carbon dioxide

• Nitrogen

What are some sources of air pollution?

• Vehicle emissions, industrial activities, burning of fossil fuels, agricultural activities, wildfires

• Marine life

• Space exploration activities

• Household cleaning products

How does the process of distillation help in water purification?

• Distillation separates water from impurities by converting it to steam and then condensing it back into liquid form.

• Distillation involves adding chemicals to water to purify it

• Distillation uses UV light to separate impurities from water

• Distillation mixes impurities with water to remove them

What are the properties of air that make it essential for life on Earth?

• Nitrogen for combustion and regulation of temperature through the greenhouse effect.

• Argon for respiration and regulation of temperature through the greenhouse effect.

• Carbon dioxide for photosynthesis and regulation of temperature through the greenhouse effect.

• Oxygen for respiration and regulation of temperature through the greenhouse effect.

Explain the concept of condensation in the water cycle.

• Condensation is the step in the water cycle where water is absorbed by the soil.

• Condensation occurs when liquid water changes into water vapor.

• Condensation is the process where water vapor in the air cools down and changes into liquid water.

• Condensation is the process where water vapor turns into solid ice directly.

How do factories contribute to air pollution?

• Factories emit rainbows instead of pollutants

• Factories contribute to air pollution by planting trees

• Factories release harmful pollutants like carbon monoxide, sulfur dioxide, and nitrogen oxides into the air.

• Factories release fresh air into the atmosphere

What is the role of filtration in water purification?

• To add more impurities to water

• To change the color of water

• To remove impurities such as sediment, debris, and particles from water.

• To increase the acidity of water

Discuss the impact of deforestation on the quality of air.

• Deforestation leads to cleaner air due to the removal of excess vegetation.

• Deforestation improves air quality by reducing the number of trees releasing harmful gases.

• Deforestation decreases air quality by increasing greenhouse gas emissions and contributing to climate change.

• Deforestation has no impact on air quality as it only affects land.

Describe the process of reverse osmosis in water purification.

• Reverse osmosis uses a magnetic field to filter water

• Reverse osmosis relies on evaporation to purify water

• Reverse osmosis is a water purification process that uses a partially permeable membrane to remove impurities from water by applying pressure to push water molecules through the membrane, leaving contaminants behind.

• Reverse osmosis involves boiling water to remove impurities