3 years ago

If you had a cup full of methanol and a pool full of methanol, would the mass change?

Chemistry

1 answer:

AnnyKZ [126]3 years ago

6 0

Answer:

the mass does not change

Explanation:

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Which change occurs when an atom in excited state returns to ground state? 1 energy is emitted 2energy is absorbed 3 the number

kozerog [31]

The answer is number 1 - energy is emitted

Energy is released when an atom in an excited state returns to the ground state.

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2 years ago

Read 2 more answers

The shielding of electrons gives rise to an effective nuclear charge, Zeff, which explains why boron is larger than oxygen. Esti

Vesna [10]

Zeff = Z - S

Here, Z is the number of protons in the nucleus, that is, atomic number, and S is the number of nonvalence electrons.

For boron, the electronic configuration is 1s₂ 2s₂ 2p₄

Z = 5, S = 2

Zeff = 5-2 = +3

For O, electronic configuration is 1s₂ 2s₂ 2p₄

Z = 8, S = 2

Zeff = 8-2 = +6

Hence, the correct answer is second option, that is, +3 and +6, the Zeff of boron is smaller in comparison to O, thus, boron exhibits a bigger size than O.

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3 years ago

How many molecules of ammonia are contained in 10.4 moles of ammonia, NH3?

Crank

Answer:

The answer is " $\bold{6.26 \times 10^{24} \ molecules \ NH_3}\\\\$ "

Explanation:

1-mole molecules as per Avogadro number $= 6.02 \times 10^{23} \ molecules\\\\$

1-mole $NH_3 \to 6.02 \times 10^{23} \ molecules\\\\$

$10.4 \ moles \ of \ \ NH_3 :$

$\to \frac{ 6.02 \times 10^{23} \ molecules }{ 1 \ mole\ NH_3} \times 10.4 \ mole \ NH_3\\\\ \to 6.02 \times 10^{23} \ molecules \times 10.4\\\\\to 62.608 \times 10^{23} \ molecules \\\\\to 6.26 \times 10^{24} \ molecules \ NH_3\\\\$

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2 years ago

Vinegar and water is a solution or mixture???

masya89 [10]

Vinegar and water is a mixture

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3 years ago

Give an example of each of the following types of friction sliding rolling and fluid?

olga2289 [7]

Friction: rubbing your hands to create heat
sliding: sled sliding across snow or ice
rolling: soccer ball down a hill
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hope these help!

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3 years ago