Assignment

Question 1

Title

Answer 1

Voltages of different metals

Question 2

Aim

Answer 2

To investigate the different voltages of metals in the reactive series when they are paired with copper.

Question 3

Method

Answer 3

• Put copper and another metal on clips and in solution

- Record voltage of metals in table and repeat combination 3 times

Question 4

Data from experiment

Answer 4

Metals used 
Copper + Tin - 0.28
Copper + Lead - 0.25
Copper + Iron - 0.76
Copper + Zinc - 0.81 
Copper + Magnesium - 1.57

Question 5

Second source

Answer 5

National 5 chemistry SQA data booklet, electrochemical series

Lithium
Potassium
Calcium
Sodium
Magnesium
Zinc
Iron
Nickel
Tin
Lead
Hydrogen 
Copper 
Silver 
Mercury 
Gold

Question 6

Analysis

Answer 6

Both sources agree that further away metals are, the higher the voltage
Metals furthest away are copper and magnesium

Question 7

Conclusion

Answer 7

In conclusion, Copper and magnesium have highest voltage as these are the metals furthest away

Question 8

Evaluation

Answer 8

A factor that may have affected reliability and accuracy of experiment is some metals more corroded than others.
Would affect as electrolytes only react with pure metals which have not reacted with oxygen.
Therefore corroded metals won’t create accurate voltage.
Fixed by cleaning metals with citric acid.
Acid removed rust as metal oxide on surface is dissolved by acid.

Question 9

Underlying chemistry

Answer 9

A redox reaction is when reductions and oxidation reactions take place at the same time.in a redox reaction, electrons lose by one substance during oxidation are gained by another substance during reduction.

Oxidation
When two different metals are connected by an electrolyte, an electric current flows from one metal to another through the connecting wires. We can create a list called electrochemical series which compare combos of metals. In the series, the bigger the gap, the bigger the electron flow from higher metal to lower metal.