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DiKsa [7]
2 years ago
7

Rafa places some copper into a solution of sodium chloride. No reaction takes place. Using the displacement theory, explain why

no reaction took place?
Chemistry
1 answer:
Charra [1.4K]2 years ago
5 0

Na more reactive than Cu

<h3>Further explanation</h3>

Given

Copper in a solution of NaCl

Required

The displacement theory

Solution

A single replacement reaction is a chemical reaction in which one element replaces the other elements of a compound to produce new elements and compounds

Not all of these reactions can occur. We can use the activity series, which is a list of elements that can replace other elements below / to the right of them in a single replacement reaction.

The voltaic series:  

<em>Li-K-Ba-Ca-Na-Mg-Al-Mn- (H2O) -Zn-Cr-Fe²⁺-Cd-Co-Ni-Sn-Pb- (H) -Cu-Hg-Fe³⁺-Ag-Pt-Au  </em>

The electrode which is easier to reduce than the hydrogen (H2) electrode has a positive sign (E red= +) and is located to the right of the voltaic series (right of H)  

The electrode which is easier to oxidize than the hydrogen (H2) electrode and is difficult to experience reduction has a negative sign (E red= -) and is located to the left of the voltaic series (left of H)

Reaction

Cu + NaCl≠

The existing copper element can not replace the sodium element, which is on the left side so the reaction will not occur.

But if it is reversed, then a reaction can occur

2 Na + CuCl2 → Cu + 2 NaCl

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e

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<em>Provided the reaction that leads to the formation of the products can proceed in both forward and backward directions, the correct answer would be yes because the reaction will proceed backward until equilibrium is reached.</em>

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2 years ago
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But in an open system, the temperatures of the iron bars after 30 minutes would be less than 160°C. There will be heat lost to the surrounding. The room temperature is 25°C. There will be exchange of the heat occur between the iron bars and the surrounding. But It would take more than 30 minutes for both iron bars to reach 160°C because heat would be transferred less efficiently.

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Answer:

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