Across
- 2. ______ change. Occurs when new substances are formed as atoms rearrange into new substances. May involve evolution of a gas, production of a new solid, change in colour or temperature
- 5. A subatomic particle located in shells around the nucleus
- 8. A substance's mass per unit of volume (calculated mass/volume)
- 9. A positively charged subatomic particle
- 10. Substances that are shiny, have high melting points, are malleable and are good thermal and electrical conductors
- 13. A pure substance made up of one type of particle
- 14. ______ molecules, for example, hydrogen gas (H2), are made up of two atoms chemically combined
- 16. Burning a piece of toast is an example of a ______ change
- 17. A type of corrosion that only affects iron
Down
- 1. The temperature at which a particular organic compound gives off sufficient vapour to ignite in air
- 3. Type of reaction where reactants have more heat energy than the products. Heat is absorbed in the reaction and the reaction feels cold
- 4. ______ change. Occurs when no new substances are formed. May involve a change in shape or size or change in state of matter. Dissolving and melting are examples of this type of change
- 6. Type of reaction where products have more heat energy than the reactants. Heat is released and the reaction will feel hot
- 7. The smallest unit of a substance where two or more atoms are combined
- 11. An element with the symbol Na
- 12. How easily something will burn or ignite, causing fire or combustion
- 15. A type of chemical reaction where a metal reacts with oxygen to produce a chemical change