Summary
Introduces the law of conservation of mass — matter is neither created nor destroyed in a chemical reaction, only rearranged — using vivid everyday examples to make the abstract law concrete.
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Teaching resources
Discussion questions
Discussion
- What does 'conservation of mass' mean?
- If you burn a log and the ash weighs less than the log, has mass been lost? What happened to the rest?
- How could you test the conservation of mass in a chemical reaction?
- Why is this law important to chemistry and to understanding matter?
Quick work-a-long
Vocabulary: mass, conservation, law, reaction, rearrange, measure.
Try it: Dissolve a measured amount of salt into a measured amount of water. Weigh the combined solution. Compare to the sum of the original weights. What do you find?