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jarptica [38.1K]
3 years ago
15

Answer all the following questions by putting a circle around a letter A.B.C or D

Chemistry
1 answer:
Nataly_w [17]3 years ago
3 0

Answer:

C. 21%oxygen

Explanation:

Dry air contains 78.09% nitrogen, 20.95%oxygen, 0.93% argon, 0.04% carbon dioxide, and small amounts of other gases.

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On the basis of which property of the elements are they divided into metals and non metals?
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The biological risk for the first person than the second as a result of radiation weighting is 10 times.

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6 0
2 years ago
1) A common experiment to determine the relative reactivity of metallic elements is to place a pure sample of one metal into an
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The chemical reaction can be represented as :

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