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const2013 [10]
3 years ago
9

Why is electroplating an example of chemical change?

Chemistry
1 answer:
wel3 years ago
7 0

Yes it is true elsectroplating is involves in chemical and physical change but all these is happened on surface of metal by action of the oxidation or reduction.

Chemical change gives by following process as :

Lot of energy of requires,

New substance formed,

And process is irriversiable .

e. g. Rusting of iron,

Photosynthesis,

Burring of kerosene,

Raising cake batter,

Frying egg.

All these examples Shows the chemical change.

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3 years ago
Determine the mass of sodium carbonate required to produce 23.4g of sodium chloride when it reacts with excess hydrochloric acid
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The balanced chemical reaction for the described reaction above is,
                          Na2CO3 + 2HCl ---> 2NaCl + H2CO3
From the reaction, 1 mole of Na2CO3 is needed to produce 2 moles of NaCl. In terms of mass, 106 grams of Na2CO3 are needed to produce 116.9 grams of NaCl. From this,
                (23.4 g NaCl) x (106 g Na2CO3 / 116.9 NaCl = 21.22 g Na2CO3
Thus, approximately 21.22 g Na2CO3 is needed for the desired reaction. 
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