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just olya [345]
3 years ago
14

Which laboratory activities involve chemical changes?

Social Studies
2 answers:
rjkz [21]3 years ago
6 0

Answer:

leaving a copper penny in vinegar until it turns green

Explanation:

just took the test

Galina-37 [17]3 years ago
5 0

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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6 0
3 years ago
What later development would occur based on the political ideas presented in the chart?
frez [133]

Answer:

The answer is that: 1. United States was formed.

Explanation:

Your question is about the American Revolutionary War, and A describes Loyalists, while B describes Patriots. Loyalists sided with the British Crown and served in the British Amry, while Patriots wanted independence and served in the American Continental Army (one of the precursors of the modern United States Army).

Why the other choices are wrong:

-3, and 4 are not true.

-2 is somewhat true but many loyalists moved to Canada, not patriots.

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3 0
3 years ago
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Soloha48 [4]

Answer:True

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2 years ago
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AlladinOne [14]

Answer:

classical conditioning

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8 0
4 years ago
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Wittaler [7]
B. inflation
I think because the others answers don't seem legitamate



 
6 0
3 years ago
Read 2 more answers
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