Physical vs Chemical Changes Review

Across
4.	a state of matter which has a fixed volume, but no fixed shape
5.	the basic unit of a chemical element
7.	a liquid turning into a gas through the addition of energy; a physical change
11.	another word to describe a chemical change
12.	solid particles formed or separated out of a liquid; evidence of a chemical change
13.	chemical digestion uses these chemicals to speed up reactions
16.	a change in this means an increase or decrease of heat energy in a substance; may be evidence of a chemical change
19.	a change in the way something reflects light; can indicate a chemical change
20.	a change that involves substances being pulled apart or combined to form completely different substances
22.	a chemical reaction in plants that changes carbon dioxide and water into oxygen and water
23.	a group of atoms bonded together; may be the same or different elements
25.	a characteristics that can be observed or measured only when atoms rearrange during a chemical change
27.	distinct forms of matter: solid, liquid, gas; also referred to as phases
28.	a substance with unique chemical and physical properties formed when two or more elements are chemically bonded during a chemical reaction

Down
1.	the universal solvent, dissolves the most substances
2.	breaking food down into nutrients
3.	evidence that a gas is formed
6.	anything that has volume and mass
8.	breaking type of digestion that uses physical means (grinding, tearing, mashing)
9.	state of matter that expands to fill its container and has no fixed shape or volume
10.	usually a physical change, the even distribution of molecules within a solvent
12.	a characteristic that can be observed or measured without changing the substance
14.	physical and chemical characteristics of matter used to describe or identify a substance
15.	a solid turning into a liquid through the addition of energy; a physical change
17.	a pure substance composed of the same type of atom throughout
18.	a liquid turning into a solid through the removal of energy; a physical change
21.	the state or process of rotting or decay; a chemical change
24.	a state of matter with a fixed volume and shape
26.	a change to a substance that occurs without forming a new substance