This is my favourite experiment to do with primary. I've done it with 1o and 6o using more or less the same worksheet and lesson plan (see link below). It could not be more perfect, it has mixing liquids, it has colours, it has a new measuring scale and they can do it themselves. I chose the foods and household chemicals quite carefully to give the students the idea that foods are generally acids or neutral whereas household chemicals are usually alkalis (not always) and we don't eat them because they react violently in our stomach (think about mixing vinegar and sodium bicarbonate).
This activity is connected to the Nutrition unit. You are introducing a new way of measuring, with colour and a chemical measuring scale (pH). They don't really need to know what it is, they can just enjoy using it and classify the things they test into acids, neutrals and alkalis.
Link to activity (pdf): Food and pH testing
No comments:
Post a Comment