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Elements
elements,compounds and mixtures
| Term | Definition |
|---|---|
| Element | substance that cannot be split up into simpler substances by chemical means |
| H | hydrogen |
| B | boron |
| C | carbon |
| N | nitrogen |
| O | oxygen |
| F | fluorine |
| P | phosphorus |
| S | sulfur |
| HE | helium |
| LI | lithium |
| BE | beryllium |
| NE | neon |
| MG | magnesium |
| AL | aluminium |
| SI | silicon |
| CL | chlorine |
| AR | argon |
| CA | calcium |
| MN | manganese |
| ZN | zinc |
| Compound | substance made of 2 or more different elements combined together chemically |
| mixture | consists of 2 or more different substances mingled with each other but not chemically combined |
| air | is a mixture of different gases |
| sea water | mixture of salt and different substances |
| crude oil | most valuable substance ever discovered |
| earth | mixture of stones,sand,clay,water etc. |
| petrol | mixture of different compounds of hydrogen and carbon |
| differences between mixtures and compounds | 1) amount of substances in the mixture can vary 2) little energy changes occur when a mixture is made 3)substances in the mixture can be easily separated |