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Vika [28.1K]
4 years ago
14

Does a change of phase produce a new substance? Explain. Please help me on this ❤

Chemistry
1 answer:
Brums [2.3K]4 years ago
3 0
Liquid, solid, and gas are all different substances
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How long of time in hours will it take to plate out 1.0 kg Ni from aqueous Ni2+ solution, if the electrical current is 102 A? wh
netineya [11]

Answer: 8.95 hours

Explanation:

Ni^{2+}+2e^-\rightarrow Ni

96500\times 2=193000 Coloumb of electricity deposits 1 mole of Nickel

1 mole of Nickel weighs = 58.7 g

Given quantity = 1.0 kg = 1000 g  (1kg=1000g)

58.7 g of Nickel is deposited by 193000 C of electricity

1000 g of Nickel is deposited by =\frac{193000}{58.7}\times 1000=3287904.6C  of electricity

Q=I\times t

where Q= quantity of electricity in coloumbs  = 3287904.6C

I = current in amperes = 102 A

t= time in seconds = ?

3287904.6C=102A\times t

t=32234.359sec

t=8.95hr      (1h=3600 sec)

Thus 8.95 hours it takes to plate out 1.0 kg Ni from aqueous Ni^{2+} solution, if the electrical current is 102 A.

4 0
3 years ago
Pleas help me i have to submit homework i hour<br> i will mark brainliest
steposvetlana [31]

Answer:

I can help

Explanation:

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6 0
3 years ago
Is "Barrel of Slime" Toxic?
slava [35]
No Barrel of Slime Isn't toxic ( Smiles )
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4 years ago
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A student tested a sample of carbon (C) by combining it with water. There was no reaction between the carbon and water. The stud
solong [7]

Answer:

No, just because carbon did not react with water, does not mean it wouldn't react with a different compound.

Explanation:

It is common knowledge that carbon is not in group 18, because it is found in all living compounds, and this means it must be reactive with many compounds. We know that water is not very reactive, but it is a good solvent. Meaning that many compounds can dissolve in water, but not chemically react with it. Carbon however is not very soluble because it does not create dipoles or hydrogen bonds. This means it will not show any change when in the presence of water, but if combined with oxygen, can form carbon dioxide.

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Small objects denser than water can float on its surface because water has high _____.
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Surface tension. Im not sure if this is completely right but I hope I helped :)
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