Chemistry 3-Limestone 0.0 / 5 ? ChemistryThe limestone cycleGCSEWJEC Created by: purplehydroplumCreated on: 18-05-16 08:27 What happens to metal carbonates when they are heated strongly? They break down 1 of 15 Define Thermal Decomposition When a compound splits into two or more materials by heat 2 of 15 How can thermal decomposition rate be investigated? Timing the colour change- limewater from clear to cloudy 3 of 15 What is the colour of sodium, calcium and copper before heating? White, white and green 4 of 15 What are the new colours of sodium, copper and calcium after heating? White, white and black 5 of 15 What gases are evolved from the heating of sodium, calcium and copper? None, carbon dioxide and carbon dioxide. 6 of 15 What is the ease of the decomposition of sodium, calcium and copper? Very difficult, fairly easy and easy 7 of 15 Why is a reaction for sodium carbonate so difficult to achieve? The more reactive the metal, the more stable the carbonate and vice versa for an unreactive metal 8 of 15 Describe Stage 1 of the limestone cycle Limestone is roasted for 20 minutes, the limestone glows and crumbles, decomposing to calcium oxide or QUICKLIME 9 of 15 Describe stage 2 of the limestone cycle A few drops of water is added to quicklime, sizzling and steam is released- and exothermic reaction. This produces calcium hydroxide, SLAKED LIME 10 of 15 Describe stage 3 of the limestone cycle Excess water is added to slaked lime, it dissolves to produce limewater 11 of 15 How would you get limewater back to limestone? React with Carbon dioxide, giving an insoluble calcium carbonate in milky limewater 12 of 15 How can limestone be used in society? Important raw material for the production of steel and iron, used on roads, making cement and glass 13 of 15 How is limestone sourced? Quarrying 14 of 15 What are the disadvantages of Quarrying limestone? Formation of dust, destruction of land and environment, noise and unsightly landscape. 15 of 15
Comments
No comments have yet been made