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Find out what effects the change in energy in a chemical reaction.

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Introduction

Exothermic and Endothermic coursework Aim To find out what effects the change in energy in a chemical reaction. Identifying Variables 1. Concentration 2. Mass/length of solid 3. Catalyst 4. Volume of liquid Hypothesis The variable I've chosen to study is the length of solid. The reaction I'm using is magnesium metal and hydrochloric acid. I think the temperature would increase if the length of ribbon is longer. It would increase because energy is given out when the reaction is taking place. The energy is from new bond being made. The heat exits the reactants. The magnesium bonds breaks as it reacts with the hydrochloric acid. The particles the join the hydrochloric acid's particles to make a new substances- magnesium chloride. ...read more.

Middle

Place 25cm of 0.5m HCL in a cup 2. Take down the temperature using a thermometer with out the magnesium ribbon 3. Add one piece of magnesium ribbon 4. Take down the temperature when you are unable to see the magnesium ribbon or when the temperature stops increasing 5. do the experiment each time changing the variable and repeat the experiment twice to make the results more accurate Results 1st experiment Length (cm) Start Finnish Change 4 21 34 13 6 21 37 16 8 21 36 15 10 21 37 16 2nd experiment Length (cm) Start Finnish Change 4 18 27 9 6 17 29 12 8 18 32 14 10 15 34 19 Analysis of results From the experiment I can see the less magnesium ribbon I put in the lower the temperature is. ...read more.

Conclusion

I found out what I needed to find out and proved my hypothesis correct. The first results didn't have a reliable trend but the second results did. If I was to devise a new hypothesis to test I could use Catalyst and see how much of a difference it would make to the temperature. For the next experiment I would add catalyst to the experiments. Evaluation My results for the first experiment weren't very accurate but the second results increased in more of a trend. There were a couple of anomalous results. This may be because I used a higher mole hydrochloric acid. To make the test fairer I should have the same mole in the first experiment. But on for the second test the results from that were enough to draw conclusion that related to the hypothesis. I think that I did repeated the experiments enough. Maggie Phillips ...read more.

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