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To investigate the rate at which different metal carbonates decompose (thermally) by measuring the amount of carbon dioxide produce when each metal carbonate is heated in a certain amount of time.

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Introduction

Gail Wingham Chemistry Sc1 - Heating Metal Carbonates Aim: To investigate the rate at which different metal carbonates decompose (thermally) by measuring the amount of carbon dioxide produce when each metal carbonate is heated in a certain amount of time. When a metal carbonate is heated the bonds that join the carbon to the metal element are broken and so the amount of carbon dioxide produced certifies the rate of thermal decomposition and the reactivity of the metal carbonated. Background Information: Thermal decomposition is the breaking up of compounds using heat. When metal carbonates are thermally decomposed (or heated) the bonds between the metal and the carbonates are broken and carbon dioxide and metal oxides are produced. An example of this reaction is when Calcium Carbonate (CaCO3) is heated; CaCO3 --> CO2+ CaO In this reaction from Calcium Carbonate, Carbon Dioxide (CO2) and Calcium Oxide (CaO) is produced. Relative Atomic Mass of an element (or Relative Formula Mass if a compound) has the same number of particles. eg. 100g of CaCO3 has the same amount of particles as 44g of CO2 and in 56g of CaO We know that this is true because of the relative atomic mass in each compound. The relative atom mass of an element or a compound is equal to the mass in one mole of the substance. ...read more.

Middle

compound is left to heat the more energy that is transferred into breaking the bonds between the carbonate and the metal atoms. Also along these lines, I predict that the higher the temperature I heat the metal carbonates the more rapidly carbon dioxide will be produced. This is because the hotter the temperature the more energy is being transferred in the time given and so more bonds can be broken more quickly. I also predict that the metal with the most reactive metal in it will have the metal carbonate that decomposes the slowest and therefore produces the least carbon dioxide which means that the metal should produce the least reactive compound. I think this because the more reactive the metal is the stronger the bond between the carbon and the oxygen is and so in order to break up (or decompose) these metal carbonate molecules a lot more energy is needed and because I am heating all metal carbonates at the same temperature and for the same amount of time the most reactive metal will have the least reactive compound and so will produce the least amount of carbon dioxide. In order of reactivity (most reactive to least) the metal carbonates I am using are; o Sodium Carbonate (NaCO3) --> Sodium is the most reactive metal out of the five that I am investigating and so Sodium Carbonate should be the least reactive compound therefore producing the less amount of carbon dioxide o Calcium Carbonate (CaCO3) ...read more.

Conclusion

the diagram, I will set up my apparatus, clamping the Bunsen burner containing the first metal carbon over the Bunsen burner at a 10cm distance from the nose. This test tube will be joined via bung and piping to the gas syringe that has a scale of 100ml (with 1ml intervals) that will measure the carbon dioxide produced. Previously I will have measure each metal carbonate so that each one has the same amount of 0.00163 moles which I will calculate by take the Relative Formula Mass and multiplying it by 0.00163 (the amount of moles) and this will give me the mass that I need of each compound. Then I will light the Bunsen burner on a blue flame and begin the timer. I will measure the amount of carbon dioxide that has been produced for each metal carbonate every minute for four minutes, recording my results in a table. And each time I change the substance that I am decomposing I will change the test tube so that they are no trances of any other carbonates when each one is burnt - this should reduce the amount of anomalies I get in my data and give me accurate results. Volume of Carbon Dioxide in ml (1st time) Volume of Carbon Dioxide in ml (2nd time) Metal Carbonate 1min 2mins 3mins 4mins 1min 2mins 3mins 4mins Sodium Carbonate Calcium Carbonate Magnesium Carbonate Zinc Carbonate Copper Carbonate Results: 1 ...read more.

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