Evidence of a chemical reaction
Scientists can tell a chemical reaction happened by comparing a substance's properties, like density, how easily it dissolves, its melting or boiling point, how flammable it is, or its odor, before and after mixing it with something else, new properties are strong evidence a new substance formed. Many reactions also release or absorb heat as they happen: engineers use this by designing, testing, and adjusting devices around it, like a hand warmer built around a heat-releasing reaction or an instant cold pack built around a heat-absorbing one, changing the amount or type of substance to control how much heat it produces and for how long.
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Midterm
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This final covers a lot of topics, so it's split into 2 parts. Each part includes a question from every one of its topics.
Final, Part 1 of 2
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Final, Part 2 of 2
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