Summary
The Chemistry of the Environment involves understanding the composition and reactions of air and water, as well as the role of nitrogen and fertilisers in agriculture.
- Air — a mixture of gases that surrounds the Earth. Example: Air is composed mainly of nitrogen and oxygen.
- Water — a compound made of hydrogen and oxygen, essential for life. Example: Water is used in various chemical reactions and as a solvent.
- Nitrogen — a gas that makes up a large part of the Earth's atmosphere. Example: Nitrogen is used in the production of fertilisers.
- Fertilisers — substances that provide nutrients to plants to enhance growth. Example: Ammonium nitrate is a common fertiliser used in agriculture.
Exam Tips
Key Definitions to Remember
- Air is a mixture of gases, primarily nitrogen and oxygen.
- Water is a compound made of hydrogen and oxygen.
- Nitrogen is a gas that is a major component of the atmosphere.
- Fertilisers are substances that provide nutrients to plants.
Common Confusions
- Confusing the composition of air with pure oxygen.
- Misunderstanding the role of nitrogen in fertilisers.
Typical Exam Questions
- What is the main component of air? Nitrogen
- How is water used in chemical reactions? As a solvent
- Why is nitrogen important in agriculture? It is used in fertilisers to promote plant growth.
What Examiners Usually Test
- Understanding the composition of air and water.
- The role of nitrogen in the environment.
- The importance and use of fertilisers in agriculture.