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Snezhnost [94]
3 years ago
6

Which of the following represents the atomic number of an element?

Chemistry
1 answer:
Anna11 [10]3 years ago
4 0

Answer:

The atomic number is the number of protons in the nucleus

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Given the chemical equation, CaCl2 + Na → NaCl + Ca. The best description of this equation is which of these?
SpyIntel [72]

Answer:

An unbalanced single replacement reaction

4 0
3 years ago
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A chemist prepares a sample of helium gas at a certain pressure, temperature and volume and then removes all but a fourth of the
Stells [14]

Answer:

e. T₂= 4T₁

Explanation:

Initially, we have a number of moles (n₁) a gas sample at a certain pressure (P), temperature (T₁) and volume (V). We can relate these variables through the ideal gas equation.

P . V = n₁ . R . T₁

where,

R is the ideal gas constant

We can rearrange this equation like:

T_{1}=\frac{P.V}{n_{1}.R}

If only one fourth of the initial molecules remain n₂ = 1/4 n₁. The new temperature (T₂) assuming pressure and temperature remain constant is:

P.V=n_{2}.R.T_{2}=\frac{1}{4} n_{1}.R.T_{2}\\\frac{P.V}{n_{1}.R} =\frac{1}{4} T_{2}\\T_{1}=\frac{1}{4} T_{2}\\T_{2}=4.T_{1}

6 0
3 years ago
7. True or False. Camouflage is a physical adaptation.
Kaylis [27]
7. true
8. false
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11. not sure
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i am so sorry this is all i could give you. other people please tell them the other answers
8 0
2 years ago
Find the volume of 56.0 grams of O2 at stp
BaLLatris [955]
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3 years ago
The atomic mass of an atom can be found by
sashaice [31]
The answer to this question is A
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