Across
- 1. Chemical reaction that occurs when oxygen reacts with a substance to form a new substance and give off energy.
- 3. Element that has both metallic and non-metallic properties.
- 6. Positively charged centre of an atom;contains protons and neutrons.
- 7. A reaction that takes place when two or more substances react to form new substances.
- 9. Substance that helps a chemical reaction proceed more quickly.
- 10. Change that results when two or more substances react to create a substance.
- 11. Substance that strongly resists the flow of electricity.
- 12. Principle that matter is not created or destroyed in a chemical reaction.
- 14. Atom that has become electrically charged because it has lost or gained electrons.
- 17. Combination of symbols that represent a compound.
- 19. A material that electric charge can move through easily.
- 21. Cloudy mixture in which tiny particles of one substance are held within another.
- 22. Ability of a substance to conduct electricity or heat.
Down
- 1. Colourless, odourless gas;produced by incomplete combustion of chemicals
- 2. Shiny, malleable, ductile element that conducts electricity.
- 4. Process in which molecules move from an area of higher concentration to one of lower concentration.
- 5. Amount of mass in a given volume of a substance.
- 7. Chemical reaction that takes place in cells;food
- 8. Chemical combination of two or more elements in a specific ratio.
- 12. Description of how a substance interacts with other substances,such as acids.
- 13. Energy stored in chemicals and released when chemicals react.
- 15. Group 17 elements in the periodic table.
- 16. Change of state from a gas to a solid.
- 18. Change of state from a gas to a liquid.
- 20. Slow chemical change that occurs when oxygen in the air reacts with a metal.