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# Investigating how the rate of reaction changes with concentration of hydrochloric when reacting with marble chip.

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Introduction

Ian Brightmore, GCSE Coursework Investigating how the rate of reaction changes with concentration of hydrochloric when reacting with marble chip Planning: I am investigating the factors, which affect the rate of reaction. To do this I am going to look at the concentrate of hydrochloric acid. I will use a reaction that I have met before: Calcium Carbonate + Hydrochloric acid ? Calcium chloride + Carbon Dioxide + Water During my preliminary work, I discovered the factors that affect the experiment will be: * The surface area of the marble chip - Smaller pieces of solids react faster than Larger solids * The concentration of Acid - As we increase the concentration we increase the rate of reaction * Temperature the reaction takes place at - If you increase the temperature, you increase the rate of reaction. ...read more.

Middle

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: Length of Wire (cm) Voltage (v) Current (A) Resistance (?) 100 2.2 0.42 5.23 90 2.2 0.52 4.23 80 2.2 0.56 3.92 70 2.2 0.64 3 60 2.1 0.72 2.9 50 2 0.8 2.5 40 2 0.92 2.17 30 1.8 1.1 1.6 20 1.7 1.4 1.2 10 1.6 1.6 1 Length of Wire (cm) ...read more.

Conclusion

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. ...read more.

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