A collection of complimentary IGCSE Chemistry activities and experiment (Cambridge IGCSE Chemistry).These class look at the thermal decomposition the calcium carbonate.

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Limestone is a typical rock that is a really useful material. Because that example, it is used for building and road making, and additionally as a starting material for making many other products. This activity illustrates several of the chemistry the limestone (calcium carbonate) and other products made from it.Calcium carbonate is cook strongly till it undergoes thermal decomposition to type calcium oxide and also carbon dioxide. The calcium oxide (unslaked lime) is dissolved in water to form calcium hydroxide (limewater). Bubbling carbon dioxide with this creates a milky suspension that calcium carbonate.

The adhering to diagram reflects the Limestone Cycle: Calcium Carbonate, Calcium Oxide, Calcium Hydroxide. Scroll down the web page for activities to show the Limestone Cycle.



Prepare a tabulated outcomes sheet before beginning the experiments.Set a lump of calcium carbonate (limestone) top top a gauze.Heat the limestone very strongly for 5–10 minutes. Create down what girlfriend observe. (If possible, darken the room and note what happens when the fire is trained directly on the lumps. It may be feasible to see the lumps glowing – this is the beginning of the hatchet ‘limelight’. Limelight was once provided to illuminate theatre performances.)Let the lumps cool and also use tongs to move it right into a boil tube. Add 2–3 drops of water v a dropping pipette. Write down your observations.Add around 10 cm3 more water to the solid. What wake up now?Filter fifty percent the mixture right into the other boiling tube and, using a drink straw, gently punch a stream of bubbles through the filtrate. What do you see?Test the remaining half of the mixture v Universal Indicator solution. Write down what girlfriend observe.

Questions1 Why go the chalk crumble contempt on strong heating?2 What kind of reaction is taking place during the heater process? create an equation for the reaction.3 Why is vapor evolved once drops the water are added? write an equation because that the reaction occurring.4 Why walk the limewater turn cloudy? compose an equation because that the reaction i m sorry is occurring.5 What is the colour change when universal Indicator is added? What does the tell you about the pH of the solution? define why the pH would certainly be expected to have this value.


Show Solutions
The heat caused the chalk’s structure to failure and carbon dioxide/a gas is evolved.Thermal decomposition. CaCO3(s) → CaO(s) + CO3(g)The reaction is very exothermic, and also the autumn of water added is partially converted to steam. CaO(s) + H2O(l) → Ca(OH)2(s)Insoluble calcium carbonate is being precipitated. Ca(OH)2(aq) + CO2O(g) → CaCO3(s) + H2O(l)The colour go from green to blue indicating that the equipment is alkaline and the pH is around 11-14. Soluble metal hydroxides room alkaline and also will provide high pH values.

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