The equipment below was set up by a student - VCE - SSCE Chemistry - Question 20 - 2022 - Paper 1
Question 20
The equipment below was set up by a student.
Zn(s)
1 M Co(NO₃)₂(aq)
and 1 M Mn(NO₃)₂(aq)
Which one of the following is correct?
A. In the beaker, the reaction be... show full transcript
Worked Solution & Example Answer:The equipment below was set up by a student - VCE - SSCE Chemistry - Question 20 - 2022 - Paper 1
Step 1
A. In the beaker, the reaction between Zn(s) and Co²⁺(aq) produces 0.48 V.
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Answer
This statement is incorrect. The reaction between Zn(s) and Co²⁺(aq) produces a voltage of approximately 0.34 V based on standard electrode potentials.
Step 2
B. In the beaker, chemical energy stored in the reactants is converted to heat energy.
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Answer
This statement is correct. In chemical reactions, the energy stored in chemical bonds is often transformed into heat energy, which is a common characteristic of exothermic reactions.
Step 3
C. In the beaker, the concentration of ions increases because Zn(s) loses 2e⁻.
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Answer
This statement is partially correct. While Zn(s) does lose electrons, contributing to a local decrease in Zn concentration, the overall concentration of other ions might not increase as expected without specific reactions occurring.
Step 4
D. In the beaker, a voltage of greater than 0.42 V must be applied to Zn(s) so that it reacts with Mn²⁺(aq).
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Answer
This statement is incorrect. The standard potential for the reaction indicates that a voltage of about 0.76 V is needed for the reaction with Mn²⁺(aq) to occur.
