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To find out how much zinc oxide is contained in Calamine.

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Introduction

Science Coursework

To find out how much zinc oxide is contained in Calamine

By Ben Marlow – 11RJ

Aim:Produce a conversion chart which shows how much zinc oxide can be made by experiment from heating different masses of zinc carbonate. Also produce a conversion chart showing the theoretical values worked out from the equation, compare the two charts.

Plan:We will heat the zinc carbonate in measurements of 1, 1.5, 2, 2.5 and 3 grams in boiling tubes over a Bunsen burner. At the end we will measure the difference in wait to find out the amount of zinc oxide present. We will do this twice, to get two sets of results so we can analyse and compare them.             To gain the measurements needed, the results I shall record are:

  • Empty test tube
  • Test tube + the zinc carbonate
  • Test tube + the zinc carbonate + mineral wool
...read more.

Middle

2

43.62

45.13

46.32

45.91

2.5

29.37

31.81

32.55

32.11

3

29.07

31.97

32.86

32.23

Another thing that is not exactly correct is the weights of zinc carbonate. The reason for it not being precise is that it was hard to get it exact, but we managed to get it close enough. Also we were rushed when weighing as other groups needed to use the scales.

The table above shows the five measurements that we recorded from our experiment. Another thing these results may not be exactly correct but they are extremely close. Reasons for them not being exact are:

  • Zinc Carbonate being lost when weighing
  • Microscopic flakes of mineral wool falling off when being moved around the science lab.

These results are as close to accurate as was possible in our surroundings though.

...read more.

Conclusion

Evaluation:

I think we carried out the experiment well, our biggest slip up was time management. We did not have time to repeat the experiment so we had to steal another groups results, which has the same affect. We did have enough time to collect our own set of results with sufficient accuracy though. If I was to do the experiment again I would spend more time setting up the equipment so that accurate amounts of chemicals were used, not just weights which were close.

To

...read more.

This student written piece of work is one of many that can be found in our GCSE Height and Weight of Pupils and other Mayfield High School investigations section.

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