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Jess Science Term 3

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Elizabeth Harris

on 15 September 2016

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Transcript of Jess Science Term 3

I think that the sun investigation will oxidise the quickest because the usual way for copper to oxidise is by using sunlight. The vinegar investigation may also be the fastest because of the effect that it has on copper. All 3 changes will be physical and reversible.
Our Fair Test
Steps 1, 2 and 3
AIM: Observe how quickly the oxidation of copper coins varies if we use the Sun, Vinegar and Coke?
Steps 4 and 5
The liquid variables: Coke, Vinegar and the Sun (Gas)

The time that it takes for the coin to oxidise and the amount of liquid used in each cup

Keeping the same:
The type of coin, the ml's of liquid and the position
We will need:

100mls of Diet Coke
100mls of Brown Vinegar
3 stopwatches
plastic cups (2 extra)
1 Pyrex measuring jug
5 copper coins (2 extra)
A small dessert spoon
1: Take 3 of the plastic cups and take 3 of the coins and place 1 in each cup.

2: Pour 100mls of diet coke into one cup and pour 100mls of brown vinegar into another LEAVE ONE CUP EMPTY (Be sure to label all cups)

3: Place each cup side by side in a place where there is sunlight, start a new stopwatch for each cup and stop time when coin is fully oxidised.

4: Record final time and any observations in a graph or write up.

5: Conclude the experiment using the results.
At the completion of our experiment, the final times were:

Sun: 3hrs and 2mins
Vinegar: 3hrs and 3mins
Coke: 3hrs and 4mins
1: Is this change chemical or physical and why?

2: Describe the action that caused change

3: Reflect on the investigation process. Suggest 2 or 3 areas you could change to improve the procedure or results.

(All have been answered in Science Booklet)
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