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Alekssandra [29.7K]
3 years ago
6

Please help I will mark Brainly. !!

Chemistry
2 answers:
Nimfa-mama [501]3 years ago
6 0

C. Eight Valence Electrons.

PolarNik [594]3 years ago
5 0
C, 8 valence electrons
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What trend in atomic radius occurs down a group on the periodic table? What causes the trend?
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Explanation:

the further down the group you go, the larger the radius becomes. its caused by the amount of electrons needed to equal out the charge of the nucleus

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In the reaction N2 + 3H2 → 2NH3, what is the mole ratio of hydrogen to nitrogen?
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Answer: The mole ratio of hydrogen to nitrogen is 3 mole: 1 mole, 3:1

Explanation:

•Mole ratios are determined using the coefficients of the substances in the balanced chemical equation. •Each coefficient represents the number of mole of each substance in the chemical reaction.

•The mole ratio can be determined by first writing out a balanced chemical equation for the reaction.

For this reaction the balanced chemical equation is

N2(g) + 3H2(g) ----> 2NH3(g)

1mol:3mol : 2mol

From the equation we can see that 1 mole of N2(g) reacts with 3 moles of H2(g) or 3 moles of H2(g) react with 1 mole of N2(g) to produce 2 moles of NH3(g).

Therefore, the mole ratio of hydrogen to nitrogen is 3 mole: 1 mole, 3:1

7 0
3 years ago
Which kind of investigations never include a hypothesis?
nignag [31]

Answer:

the answer is descriptive

Explanation:

descriotive never ever have hypothisis

5 0
3 years ago
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When a physical change occurs what cannot be affected as well?
vazorg [7]
Physical changes are changes affecting the form of a chemical substance, but not it`s chemical composition. 
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-appearance, texture, color, odor, melting point, boiling point, density, solubility, polarity, and many others. 

Answer:
C. density(the degree of compactness of a substance)


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4 years ago
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A 3.35 g sample of an unknown gas at 81 ∘C and 1.05 atm is stored in a 1.75 L flask.
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