Seudónimo Seudónimo
  • 04-04-2019
  • Social Studies
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Which laboratory activities involve chemical changes?

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jairacastillol
jairacastillol jairacastillol
  • 28-01-2020

Answer:

The green growing on the penny of copper and the rust forming on the nail of iron are chemical changes.

Boiling away salt water, scraping iron filings from a mixture of sand with a magnet, and breaking a rock with a hammer, are physical changes.

Extracting iron filings from a mixture of sand with a magnet is absolutely no change.  That's merely separating items that got mixed up.

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TreMye
TreMye TreMye
  • 20-10-2020

Answer:

leaving a copper penny in vinegar until it turns green

Explanation:

just took the test

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