Chemistry Crossword

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.

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.