Chemistry Terms

1. a substance that cannot be separated into simpler substances
2. any of the chemically inert gaseous elements of the helium group in the periodic table
8. a pungent gas compounded of nitrogen and hydrogen (NH3)
9. A chemical bond formed when two atoms share two electrons.
10. The number of digits in a number that tell you useful information.
14. a colorless, odorless gas; the lightest chemical element
15. zero This is the lowest temperature possible
17. The liquid that dissolves the solid in a solution
18. occurring or formed with the release of heat

1. an elementary particle with negative charge
3. When particles move from areas of high concentration to areas of low concentration.
4. A compound that gives off OH- ions in water. They are slippery and bitter and have a pH greater than 7.
5. A measurement of the randomness in a system
6. a ion with a positive electric charge
7. electron an electron in the outer shell of an atom which can combine with other atoms to form molecules
11. A mixture of two metals
12. bond a chemical bond that involves sharing a pair of electrons between atoms in a molecule
13. occurring or formed with absorption of heat
16. The amount of matter in an object.