Across
- 2. The substances that appear as a result of a chemical reaction
- 5. A layer of gas the protects us from the sun's ultraviolet rays
- 6. This is used to help plant's grow faster, but it can also be harmful to the environment and lead to the overgrowth of algae in a lake, for example
- 7. The shape, size or physical aspect of a substance changes, but the chemical composition stays the same.
- 9. A scientific discipline that attempts to combat the polluting effects from harmful substances created by humans on the Earth's land, water and air
- 11. A process in which one or more substances change into another or others which are different
- 12. Satisfying the needs of this generation without jeopardising the capacity of future generations to satisfy their needs
- 13. A French chemist who helped discover the law of conservation of mass
- 14. In all chemical reactions the mass of the reactants is equal to the mass of the products
Down
- 1. Examples of these are natural gas, oil and coal
- 2. A change produced in nature
- 3. The composition of a substance changes
- 4. The initial (first) substances in a chemical reaction
- 8. When carbon dioxide and methane form a layer in the Earth's atmosphere, which doesn't allow the solar radiation to escape the Earth.
- 10. When combusted fossil fuels, sulphur and nitrogen oxides dissolve in the rainwater to form sulphuric and nitric acid