• Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

To investigate the thermal decomposition of copper carbonate and try to prove that the formula is CuCO3, and that the percentage of CO2 lost during thermal decomposition is 35.5%

Extracts from this document...

Introduction

Lauren Dakin 10S Science Group 10 2 Thermal Decomposition Aim: To investigate the thermal decomposition of copper carbonate and try to prove that the formula is CuCO3, and that the percentage of CO2 lost during thermal decomposition is 35.5% Introduction: Copper Carbonate has been given the formula CuCO3. I will prove this correct by studying its thermal decomposition. It has the potential to divide into three groups: 1. Copper Oxide and Carbon Dioxide (CuO) + (CO2) 2. Copper and Carbon and Oxygen (x3) (Cu) + (C) + (11/2O) 3. Copper and Carbon Monoxide and Oxygen (Cu) + (CO) + (O) I did a preliminary experiment to find out what copper carbonate thermally decomposed into. I heated some copper carbonate in a test tube and when it gave off gas I held a glowing splint in it. This is the test for Oxygen. If there is oxygen present, the splint will re-light. In this case, it did not so there was no oxygen present. I then did a test for Carbon Dioxide. This involved trapping a small amount of the gas given off by the thermally decomposing copper carbonate in a pipette and releasing it into a new test tube containing Lime Water. Carbon dioxide reacts with lime water to produce calcium carbonate, which is a liquid and cloudy white in appearance. The lime water did turn cloudy, which means there was carbon dioxide present in the gas given off by the copper carbonate. ...read more.

Middle

They will all be reliable because of the repetition and because the scales are accurate. They will all be recorded in grams, except the final set which will be in percent. Results: 1. 2. 3. Mass grams Crucible + lid grams Mass + crucible + lid grams Copper carbonate + mass + crucible +lid grams Copper oxide + mass + crucible +lid grams Mass of CuO grams Mass of CO2 lost grams % of CO2 lost grams 0.2 14.65 14.85 15.04 14.98 0.14 0.06 30% 0.4 14.14 14.54 15.24 15.13 0.29 0.11 27.5% 0.6 13.88 14.48 15.07 14.89 0.41 0.19 31.6% 0.8 12.85 13.65 14.45 14.18 0.53 0.27 33.7% 1.0 19.53 20.53 21.53 21.26 0.72 0.28 28% Mass grams Crucible + lid grams Mass + crucible + lid grams Copper carbonate + mass + crucible +lid grams Copper oxide + mass + crucible +lid grams Mass of CuO grams Mass of CO2 lost grams % of CO2 lost grams 0.2 14.65 14.85 15.05 15.01 0.13 0.07 35% 0.4 14.18 14.58 14.95 14.85 0.27 0.13 32.5% 0.6 13.00 13.60 14.20 14.00 0.40 0.20 33.3% 0.8 13.71 14.51 15.31 15.03 0.52 0.28 35% 1.0 12.69 13.69 14.69 14.33 0.64 0.36 36% Mass grams Crucible + lid grams Mass + crucible + lid grams Copper carbonate + mass + crucible +lid grams Copper oxide + mass + crucible +lid grams Mass of CuO grams Mass of CO2 lost grams % of CO2 lost grams 0.2 14.39 14.59 14.79 14.72 0.12 0.08 40% ...read more.

Conclusion

I did change the crucible and lid each time, but as they were weighed and the copper oxide was subtracted from their weight correctly each time, that doesn't interfere. The results I obtained support my experiment (apart from the two anomalous results) so, assuming my experiment can be classified as fair, I can claim that my results support my prediction and follow my theory: that the results should be around 35.5% and I predict a range of 30% to 41% (5.5% either side of 35.5%). I do have enough results to come to a clear conclusion but if I were to repeat the experiment I would like to take the 'mass/grams' up to 2.0. That would provide a clearer conclusion and also allow a higher chance for a pattern to be spotted. The main difficulty when carrying out the experiment itself was working out how long to heat the copper carbonate for. If I was to repeat the experiment, I would time how long each crucible was over the flame for. This would make the experiment fairer and more valid. I would also like to compare my results with more than one other person's results, and to compare the basic results, not just the average results. This would give a better idea of the results other people are getting, what conclusions they are reaching and how they got there. But I would only try the above ideas if I were to repeat the experiment. As it is, results are all adequate and have allowed me to come to a valid conclusion that supports my prediction. ...read more.

The above preview is unformatted text

This student written piece of work is one of many that can be found in our GCSE Classifying Materials section.

Found what you're looking for?

  • Start learning 29% faster today
  • 150,000+ documents available
  • Just £6.99 a month

Not the one? Search for your essay title...
  • Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

See related essaysSee related essays

Related GCSE Classifying Materials essays

  1. Thermal decomposition of Copper Carbonate (CuCo3).

    2) Using analytical-balance weigh the mass of sample (CuCo3) and sample-container to three decimal places and record the reading. 3) Transfer the sample to test-tube and reweigh the sample container and sample residues on the analytical balance and record the reading. 4) Deduce the mass of sample (CuCo3) by subtracting the mass of sample-container sample -residues from the mass of sample and sample-container.

  2. Free essay

    Periodic table

    As there is a greater chance of these types of disorders appearing in males it is often called a sex-linked disorder. Mutations Mutations are caused by an alteration to genes. Mutations can occure in a single gene - genetic mutation or in a chromosome -called a chromosomal mutation.

  1. Gold. For thousands of years, gold has been regarded as the finest and ...

    Again, I was not surprised to find that most of the people's, who knew the karatage, gold jewellery was 9k and this is supported by the fact that 9 carat gold is the standard for gold jewellery in the UK.

  2. Our experiment consisted of two samples of water containing unknown substances, and our objective ...

    It's better if we take the substance to the flame rather that the flame to the substance (e.g. holding and pointing the Bunsen burner towards the substance on a heat-proof mate). This is because then the experiment will be more safer as if we happen to drop the substance then

  1. Relationship between mass of MgO and its formula

    - Tongs are needed so you do not touch the hot crucible. - Always stand during this experiment, as there is a possibility of the experiment toppling over, so when it does happen you can quickly jump out of the way.

  2. material science unit 2 task 2

    10. Very tough and stiff. 11. No deformation. 12. It will not rust. 13. It will not swell up. Uses: 1. Used to insulate wires. 2. They are also used to make equipments for grinding, polishing or cleaning hard surface areas. 3. Used to insulate places or objects by coating them and keeping them warm. 4.

  1. GCSE Chemistry - Obtaining Zinc Oxide from Calamine

    Also all of the calamine might not have reacted, I do not think that that is the reason because I made sure that it reacted. I know that I made all the calamine react because when it started to turn yellow I shook the test tube to make sure all

  2. Which equatoin is correct

    To avoid any large errors whilst conducting the experiment I intend to collect the maximum volume of gas as 75cm3. Using reaction in equation (1) I am able to find the mass of CuCO3 in grams that would produce the maximum gas volume of 75cm3.

  • Over 160,000 pieces
    of student written work
  • Annotated by
    experienced teachers
  • Ideas and feedback to
    improve your own work