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kow [346]
3 years ago
12

a strip of impure copper is given to you. how will you purify it by using chemical effects of electric current ?

Chemistry
2 answers:
Oksi-84 [34.3K]3 years ago
6 0

This can be done through electrolysis. Electrolysis is the separation of a substance  into two or more substances that may differ from each other and from the original substance by passing an electric current through a solution that contains ions.

In the case of copper,  we use a  copper (II) sulphate  solution which we put in a large beaker. The impure copper will be used as the positive electrode (anode) and for the negative electrode (cathode)  will be a bar of pure copper.

When the electric current is switched on, the bar of pure copper which is the cathode  increases greatly in size as copper ions leave the anode of impure copper and attach to  the cathode.  The anode becomes smaller and smaller as it loses copper ions until all that is left of it is impurities in form of a sludge beneath it.


finlep [7]3 years ago
5 0
You would Purify it with magnesium
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A food provides enough energy to raise the temperature of 2000 grams of water by 10°c. how many kilocalories does it contain?
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A food provides enough energy to raise the temperature of 2000 grams of water by 10°c contains 20 KCa.

1 Calorie is the amount of heat needed to elevate one gram of water to one degree Celsius temperature at one atmosphere of pressure.

The term "kilocalorie" is used to describe the amount of energy needed to increase 1 L of water's temperature by one degree Celsius at sea level.

Given

Mass of water (m) = 2000 g
Temp raise (ΔT) = 10°C

Heat capacity of water (C) =  1 calorie/g-C

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Heat (ΔH) = m × C × ΔT

                = 2000 × 10 = 20000 C

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20000 C = 20000/1000 = 20 KCa

Hence, a food provides enough energy to raise the temperature of 2000 grams of water by 10°c contains 20 KCa.

Learn more about Calories here brainly.com/question/23688200

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5 0
2 years ago
"Chilling" is most commonly practiced by:
zimovet [89]
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Answer:

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Explanation:

Hope that made sense!

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