- Empty test tube
- Test tube + the zinc carbonate
- Test tube + the zinc carbonate + mineral wool
The mineral helps to keep the vapour inside the test tube, to make sure that no yield is lost in the heating process.
Prediction:
I am expecting the weight to decrease after it has been heated, as some gas will be released when the reaction takes place. As our environment is not controlled it will be lost into the atmosphere.
Diagram of experiment:
Results:
All weights below are in grams:
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. I know this because we have checked with another group to see there recordings. We did this as we did not have time to repeat the experiment and doing this was the quickest and easiest way to find the results.
The table above shows the results from another group, as you can see they follow the same trend as the results that we recorded.
Graphs:
The graph above shows the weight change, before and after heating. Being honest, I am not sure if this graph is relevant but it does help to show the data in a visual way. One thing that the graph does tell us is that the weight after is less. This is what we had predicted.
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.
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