This week in Science, Year 5 have been learning about reversible changes. They have looked at how we can melt ice to turn it from a solid to a liquid by heating it and if we heat it further it turns into a gas (water vapour). Then we can reverse the changes by cooling the gas to create a liquid and cool it further (or freeze it) to turn it into a solid.
The children did an experiment to find out what substances were soluble and which created a solution when mixed. We also found out that when we create a solution, the molecules of solute (the solid) filled the gaps in between the molecules of the solvent (the liquid) and only so much of the solute can be dissolved because there is only so much space between the solvent molecules.