| A | B |
|---|
| Strong | resists the effects of forces |
| Brittle | hard but breaks easily |
| Transparent | Lets light through and we can see through it |
| Translucent | lets light through but we can't see through it |
| Rough | Produces a lot of friction when rubbed |
| Insoluble | does not dissolve easily in water or other liquids |
| Opaque | does not let light through and we cannot see through it either! |
| Smooth | produces little friction when rubbed |
| Combustible | burns easily |
| Non-combustible | doesn't burn easily |
| Hard | difficult to scratch |
| Rigid | does not bend easily |
| Flexible | bends easily |
| Soft | easy to scratch |
