Chemistry Crossword

6. chemical combination of two or more elements in a specific ratio.
9. invisible negatively charged particle that orbits the nucleus of an atom
14. chemical reaction that takes place in cells.
15. chemical reaction that absorbs energy.
16. chemical reaction that occurs when oxygen reacts with a substance to form a new substance and give off energy.
18. change of state from a liquid to a gas.
19. orbit of electrons around the nucleus of an atom.
21. pure substance that cannot be broken down into other substances, substance made up of only one type of atom.
23. principle that matter is not created or destroyed in a chemical reaction, the mass of the products always equals the mass of the reactants.
25. the smallest part of an element that is representative of that element.

1. combination of symbols that represent a compound.
2. a reaction that takes place when two or more substances react to form new substances.
3. 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.
4. number of protons in the nucleus of one atom of an element.
5. cloudy mixture in which tiny particles of one substance are held within another and particles cannot be separated out from the other substance.
7. measure of atomic mass 1 amu is equal to 1/12th of an atom.
8. group 2 elements in the periodic table.
10. substances that helps a chemical reaction to proceed more quickly.
11. chemical reaction that releases energy.
12. description of how a substance interacts with other substances.
13. catalyst involved in chemical reaction in living things.
16. slow chemical change that occurs when oxygen in the air reacts with a metal.
17. group 1 elements in the periodic table, not including hydrogen.
20. an experiment in which all reactants and all products of a chemical reaction are accounted for.
22. ability of a substance to conduct electricity or heat.
24. mass of one atom of an element calculated from the total number of protons neutrons and electrons.