Dissolving is a way of mixing a solid and a liquid.Filtering and sieving are methods of separating mixtures of solids and liquids.Burning or mixing a liquid with bicarbonate of soda are examples of irreversible changes. The change is irreversible because a chemical reaction has taken place. For example, if a cake mixture is baked it becomes a cake and we cannot turn it back into a mixture.
Melting and heating are examples of reversible changes.Īn irreversible change is a change that cannot be changed back again.
For example, if an ice-cube is melted it becomes water but we can freeze it again to become an ice-cube so it can return to its original state. In KS2 children learn about types of solids, liquids and gases, how temperature and pressure affect substances in different states and how matter changes state.Ī reversible change is a change that can be changed back again.
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