Chemistry :D

1. change that results when two or more substances react to create new substance(s)
2. pure substance that cannot be broken down into other substances
4. energy stored in chemicals and released when chemicals react
5. ability of a substance to be able to conduct electricity
6. description of how a substance interacts with other substances , such as acids
8. catalyst involved in chemical reactions in living things
9. chemical combination of two or more elements in a specific ratio
10. group 17 on the periodic table
11. energy of charged particles
14. the smallest part of an element that is representative of that element
15. colourless, odourless, poisonous gas
16. group 1 elements on the periodic table; the most reactive elements
17. number of protons in the nucleus of one atom of an element
19. invisible negatively charged particle that orbits the nucleus of an atom
20. change of state from a gas to a solid

1. a reaction that takes place when two or more substances react to form new substances
3. orbit of electrons around the nucleus of an atom
6. principle that matter is not created or destroyed in a chemical reaction
7. substance that helps a chemical reaction to proceed more quickly
12. combination of symbols that represent a compound
13. measure of atomic mass
15. an experiment in which all reactants and all products of a chemical reaction are accounted for
16. mass of one atom of an element
18. chemical reaction that occurs when oxygen reacts with a substance to form a new substance and give off energy
20. description of a solid that can be stretched into a long wire