Across
- 3. The point at which a substance changes from a solid to a liquid (0°C for water)
- 4. The property that describes how readily a substance combines chemically with other substances
- 5. A clue that a chemical change has occurred, such as silver turning dark when exposed to air or a new copper roof turning green over time
- 7. Slicing a tomato or breaking a shoelace are examples of this type of physical change
- 9. The point at which a substance changes from a liquid to a gas (100°C for water)
- 11. A material's ability to burn in the presence of oxygen
- 12. The ratio of the mass of a substance to its volume that can be used to test the purity of the substance
- 13. A gas that is necessary in order for a substance to burn
Down
- 1. Melting ice and creating liquid water or boiling water and creating a gas are examples of this type of physical change
- 2. A solid that forms and separates from a liquid mixture that is a clue that a chemical change is occurring
- 5. This type of change occurs when a substance reacts and forms one or more new substances
- 6. A process that separates the substances in a solution based on their boiling points
- 8. A brittle, reddish-brown compound that forms when oxygen reacts with iron and water
- 10. This byproduct of combining baking soda and vinegar is a clue that a chemical change is occurring
- 11. A process that separates materials based on the size of the material's particles