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garri49 [273]
3 years ago
15

HHHAAAAALLLPPPP It’s due tomorrow

Chemistry
1 answer:
iris [78.8K]3 years ago
7 0

Answer:

D.

Explanation:

Only 0.0035% of the electromagnetic spectrum is visible to the human eye

Hopefully this helped :)

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The volume occupied by a gas at STP is 250 L. At what pressure (in atm) will the gas occupy 1500 L, if the temperature is consta
Dennis_Churaev [7]

Answer:

6 atm

Explanation:

Using the formula P1V1=P2V2

P1= Initial Pressure

V1= Initial Volume

P2= Final Pressure

V2= Final Volume

And knowing that at stp gas will always be at 1 atm

250L(P2) = 1500

P2= 6 atm

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2 H2 + O2 → 2 H2O<br> Is the reaction balanced?
Alinara [238K]
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Annette [7]

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8 0
3 years ago
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Calculate the percent activity of the radioactive isotope strontium-89 remaining after 5 half-lives.
maria [59]
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3 years ago
What is the number of valence electrons that most atoms prefer?
Nataly_w [17]

Answer: 8 electrons

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Electrons are happy when they have a full outer shell which usually needs to be 8 electrons. However, some of the smaller elements like helium are happy because they can hold a max of 2 electrons and helium has 2 electrons since it has 2 protons in its core as well as 2 electrons in its energy levels.

4 0
3 years ago
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