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OverLord2011 [107]
2 years ago
11

Which element has the least density at STP?

Chemistry
1 answer:
vladimir2022 [97]2 years ago
8 0

Answer:

Helium, this noble gas has the least density at STP

Explanation:

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If your asking how much the reactions weigh separately than it should be 25

Explanation:

25 +25=50

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3 years ago
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3 years ago
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The substances present before a chemical reaction takes place are called?
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3 years ago
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Talja [164]

Answer:

B. Cu + 4HNO3 → Cu(NO3)2 + 2H2O + 2NO2

Explanation:

Hello,

In this case, we should understand oxidizing agents as those substances able to increase the oxidation state of another substance, therefore, in B. reaction we notice that copper oxidation state at the beginning is zero (no bonds are formed) and once it reacts with nitric acid, its oxidation states raises to +2 in copper (II) nitrate, thus, in B. Cu + 4HNO3 → Cu(NO3)2 + 2H2O + 2NO2 nitritc acid is acting as the oxidizing agent.

Moreover, in the other reactions, copper (A.), sodium (C. and D.) remain with the same initial oxidation state, +2 and +1 respectively.

Regards.

8 0
2 years ago
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