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Barney and Tim are finding out what happens when certain substances are mixed together.
They are interested in observing any changes and trying to find out whether the change is permanent (irreversible) or temporary (reversible).
They start by drawing up a chart to write their results in.
Look this over, understand what they've filled in, but don't try to learn it - you can come back to this any time by pressing the red button on the right-hand side of any page.
| NAME | MIXED WITH | RESULT | CHANGE? |
|---|---|---|---|
| Sand | Water | Did not dissolve | Reversible |
| Salt | Water | Reversible | |
| Sugar | Water | Dissolved - clear | |
| Instant coffee | Water | Dissolved - brown | Irreversible |
| Andrews salts | Water | Fizzed - gas produced | Irreversible |
| Hot chocolate powder | Water | Did not dissolve | Reversible |
| Bicarbonate of soda | Vinegar | Fizzed - gas produced | Irreversible |
| Boiled sweet | Water | Dissolved - pink | Reversible |
| Dirty 2p coin | Lemon juice | Coin clean/juice dirty | Irreversible |
Now that they have completed their chart, they need your help in sorting out their observations - are you up for that?
