Chemistry Crossword

5. cloudy mixture in which tiny particles of one substance are held within another and particles cannot be separated out from the other substance.
11. orbit of electrons around the nucleus of an atom.
18. change that results when two or more substances react to create a different substance, the new substance have completely different properties from the original one.
20. group 2 elements in the periodic table.
21. number of protons in the nucleus of one atom of an element.
23. chemical reaction that releases energy.
24. measure of atomic mass 1 amu is equal to 1/12th of an atom.
25. the smallest part of an element that is representative of that element.

1. chemical reaction that absorbs energy.
2. principle that matter is not created or destroyed in a chemical reaction, the mass of the products always equals the mass of the reactants.
3. an experiment in which all reactants and all products of a chemical reaction are accounted for.
4. chemical combination of two or more elements in a specific ratio.
6. chemical reaction that takes place in cells.
7. chemical reaction that occurs when oxygen reacts with a substance to form a new substance and give off energy.
8. slow chemical change that occurs when oxygen in the air reacts with a metal.
9. description of how a substance interacts with other substances.
10. a reaction that takes place when two or more substances react to form new substances.
11. catalyst involved in chemical reaction in living things.
12. change of state from a liquid to a gas.
13. combination of symbols that represent a compound.
14. group 1 elements in the periodic table, not including hydrogen.
15. ability of a substance to conduct electricity or heat.
16. invisible negatively charged particle that orbits the nucleus of an atom
17. pure substance that cannot be broken down into other substances, substance made up of only one type of atom.
19. substances that helps a chemical reaction to proceed more quickly.
22. mass of one atom of an element calculated from the total number of protons neutrons and electrons.