In order for me to find the rate of reaction, I will have to time how long it will take to form 50 cm of Co2 Gas product.
To keep this a fair test, I will have to do the following:
Prediction:
Constantan wire is a malleable alloy of normally 60% copper and 40% nickel. I expect the resistance to rise as the length gets longer seeing as the longer the wire, the more atoms the protons have to pass on the way down the wire.
Apparatus:
Method:
I got hold of all the equipment needed to complete the experiment and set it all up according to the diagram on my plan. I measured out the specified lengths which were 10cm, 20cm, 30cm, 40cm, 50cm, 60cm, 70cm, 80cm, 90cm and 100cm. I took the crocodile clips and clipped them at the lengths mentioned. I then took my piece of paper and recorded the voltage and the current for each of the ten lengths. I recorded the voltage and the current because am planning to find the resistance using ohms law, which is:
Voltage = Current x Resistance
But then I am looking for the resistance, so I will have to reverse ohms law so it will work out resistance. The law will then look like:
Resistance = Current ÷ Voltage
Using this rule, I will work out the resistance. I also will repeat the experiment so then I can use the other results along with the newest one to produce more accurate results.
Results:
I took the resistance from both sets of results and worked out the average resistance for all the lengths, which looked like this:
So I used these results to plot out the graph (See graph paper)
Conclusion:
I have found out that my prediction was in the end right because of the scientific knowledge I applied to it. Not many patterns stood out, but I noticed that if you double the length of constantan wire, you doubled the resistance. Which means that the length of wire is proportional to the resistance. The resistance is great at a longer piece of wire because the current is the flow of electrons thought a wire. And the wire is made out of Ions. And so the longer the piece of wire, the more Ions there are. Making more ions for the electrons to pass. Thus making it more difficult for the electrons to flow through the wire, making the resistance greater.
Evaluation:
When I look back on the experiment, I can think of a few things that I could have done better. One for instance would be that I could of used the same equipment for both of the sets of results, as this would of give me more accurate results because one little thing could of changed, like the thickness of the wire by 0.01 cm. If I had more time with the experiment, I could have done more readings at different lengths, like for example, I could of measured every 5cm instead of 10 to get more accurate readings and then a more accurate graph.
