Chemisty Crossword

5. description of how a substance interacts with other substances, such as acids;chemical properties are observable only when a chemical change occurs
6. process in which molecules move from an area of higher concentration to one of lower concentration
8. amount of mass in a given volume of a substance
11. pure substance that cannot be broken down into other substances; substance made up of only one type of atom
12. cloudy mixture in which tiny particles of one substance are held within another and particles cannot be separated out from the other substance
14. change of state from a gas to a solid
15. a substance that helps a chemical reaction to proceed more quickly
17. A compound that dissolves in water to form a solution with a pH lower than 7.
19. Group 2 elements on the periodic table. Not as reactive as group 1 but more reactive than all other groups.
20. chemical reaction that takes place in cells; food (sugar) reacts with oxygen to produce energy, water, and carbon dioxide
21. an experiment in which all reactants and all products of a chemical reaction are accounted for
23. The tiniest part of an element that represents said element. Contains a nucleus, and a balanced amount of protons and neutrons.
24. change of state from a gas to a liquid
25. Change of state from a liquid to a solid

1. Group 1 elements on the periodic table. the most reactive elements. Does not include hydrogen.
2. change of state from a liquid to a gas
3. change that results when two or more substances react to create a different substance or substances; the new substances have completely different properties from the original ones
4. odorless gas;produced by incomplete combustion of chemicals containing carbon
7. principle that matter is not created or destroyed in a chemical reaction; the mass of the products always equals the mass of the reactants
9. a reaction that takes place when two or more substances react to form new substances
10. chemical combination of two or more elements in a specific ratio
13. chemical reaction that absorbs energy
16. A compound that dissolves in water to form a solution with a pH higher than 7
18. The unit used in measuring an atom's mass.
21. chemical reaction that occurs when oxygen reacts with a substance to form a new substance and give off energy
22. mixing of a substance with air or water;this reduces the substance’s concentration