|7 . 1
|The changes where no new substances are formed.
|The changes where new substances are formed.
|When volume of an object increases and its density decreases.
|(The opposite of expansion) When the volume of an object decreases.
|The process of turning liquid into gas (vapour).
|The process of turning solid into liquid.
|The process of turning gas into liquid.
|The process of turning liquid into solid
|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.
|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.