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| Question | Answer |
| 7 . 1 | Hi :) |
| Physical Changes | The changes where no new substances are formed. |
| Chemical changes | The changes where new substances are formed. |
| Expansion | When volume of an object increases and its density decreases. |
| Contraction | (The opposite of expansion) When the volume of an object decreases. |
| Evaporation | The process of turning liquid into gas (vapour). |
| Melting | The process of turning solid into liquid. |
| Condensation | The process of turning gas into liquid. |
| Freezing (solidification) | The process of turning liquid into solid |
| Precipitate | An event or situation that is undesirable. |
| what is :- solute solvent solution? | Solute : the solid that is been dissolved. Solvent : the dissolving liquid. Solution : the mixture that is formed. |
| Crystallisation | If the solvent is removed by evaporation, the solute particles can join together and form crystal. This process is known as crystallisation. |
| How can you detect a chemical change? | The presence of a new substance can be detected by: 1. seeing a new colour 2. smelling a gas or seeing bubbles 3. seeing a new solid forming in a clear solution 4. seeing or feeling a change in temperature. |
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