Unit 2

3. A substance that takes part in and undergoes change during a chemical reaction.
5. The variable in an experiment that is measured or observed.
8. A material that allows heat to pass through it efficiently.
9. The process by which a liquid changes into a gas, usually due to heating.
10. The process by which a gas changes into a liquid when cooled.
12. A change that forms a new substance and cannot be undone.
13. A material that allows heat or electricity to flow through it easily.
15. Factors in an experiment that are kept constant to ensure a fair test.
17. A characteristic of a substance that can be observed without changing its chemical identity.
18. A chemical reaction where iron reacts with water and oxygen to form iron oxide (rust).
19. A physical change where a solute disperses into a solvent to form a solution.
21. The liquid in which a solute is dissolved to form a solution.

1. The variable in an experiment that is deliberately changed or manipulated.
2. A change that can be undone, returning a substance to its original state.
4. A method for separating solids from liquids by passing the mixture through a filter.
6. The substance that is dissolved in a solvent to form a solution.
7. An experiment where only the independent variable is changed, and all other variables are controlled
11. A material that allows the flow of electric current.
14. The temperature at which a substance changes from solid to liquid.
16. A material that resists the flow of heat or electricity.
20. reaction A process in which substances interact to form new substances with different properties.