| A | B |
|---|
| Compounds are either covalent | or ionic |
| Chemical bonds are links | between two or more atoms |
| In covalent compounds atoms | combine by sharing electrons |
| Carbon dioxide and water are examples | of covalent compounds |
| In ionic compounds, atoms gain | or lose electrons to form ions |
| In an ionic compound all the positive | ions attract all the negative ions |
| Table salt is an | ionic crystal |
| Antoine Lavoisier | 1743-1794 |
| Brine is | salt water |
| Exothermic means | heat or light leaving |
| Endothermic means | absorption of energy |
| Bioluminescence involves | creatures that glow |
| Oolichan are known as candlefish | due to the oil they contain |
| Pressure is force over | area |
