In Science this term we are learning about cause and effect. Our big idea is that materials can be changed in lots of ways, particularly when they are heated, mixed or cooled. Furthermore when materials change they often look different. We also talked about changes that can be reversed and others that may be irreversible.
To check the children's understanding of what mixtures are, we made a fruit salad by combining five different kinds of fruit supplied by the children. We talked about what is different and also the same about the fruit. Some children noticed that the pieces weren't exactly the same as they were before they were mixed as the apple and banana were starting to go brown and some of the fruit juice had leaked out. Everyone agreed that we couldn't put the bits of fruit back together again to make the whole fruits so we concluded that the changes were irreversible.
Some children came up with the definition that a mixture is a combination of two or more materials. Most children were keen to taste the fruit salad. We put it into the cups reserved for jelly-making next week and ate our fruit salad with a fork. Mmm! Maybe we should have fruit salad every day!