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Oliga [24]
3 years ago
6

What happens to the temperature of a substance during a phase change?

Chemistry
1 answer:
Cloud [144]3 years ago
8 0
C. It stays the same as energy is added.
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An ice cube is placed on a kitchen counter. Which best describes heat flow in this situation
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If I touch a hot object, my hand gets hot through which type of heat transfer?
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Explanation:

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Purification of nickel can be achieved by electrorefining nickel from an impure nickel anode onto a pure nickel cathode in an el
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Answer: 530 hours

Explanation:

The reduction of Nickel ions to nickel is shown as:

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

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

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Given quantity = 18.0 kg = 18000 g  (1kg=1000g)

58.7 g of Nickel is deposited by 193000 C of electricity

18000 g of Nickel is deposited by = \frac{193000}{58.7}\times 18000=59182282.8C of electricity

Q=I\times t

where Q= quantity of electricity in coloumbs  = 59182282.8C

I = current in amperes = 31.0 A

t= time in seconds = ?

59182282.8C=31.0A\times t

t=1909105.9sec

(1h=3600 sec)

t=530hours

Thus 530 hours are required to plate 18.0 kg of nickel onto the cathode if the current passed through the cell is held constant at 31.0 A

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3 years ago
AICI3(s)+Ca 3N2(s)-AIN(S)+CaCl2(s)
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Answer:

2AlCl3 + Ca3N2 - 2AlN+ 3CaCl2

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