We looked at several substances, found their mass, and then we changed their state, mostly by adding heat. We found that the mass of each stayed the same. Even in the case of baking soda and vinegar, where a gas is produced, we found that the total mass did not change.
We talked about and watched a movie on physical changes and chemical changes.
Physical changes alter the characteristics of a substance, but they do not produce new substances. Physical changes include changes in size, shape, or state.
Chemical changes produce a a new substance with its own characteristics and properties. Clues that a chemical change has taken place is a colour change or that heat and/or light is produced.
Students made a list of physical and chemical changes. Later today we'll check their lists and see how they did.
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