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Learning checklist for 1.2: How do rocks provide building materials

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Introduction

´╗┐Learning checklist for 1.2: How do rocks provide building materials Limestone Limestone, containing the compound calcium carbonate (CaCO3), is quarried and can be used as a building material. Calcium carbonate can be decomposed by heating to make calcium oxide (quicklime) and carbon dioxide. This is classed as a thermal decomposition reaction If the mass of calcium carbonate is measured in the crucible (on the right) before and after heating the mass will decrease because mass is lost due to CO2 being given off. The precision of this experiment can be increase by using a mass balance that measures to more decimal places. The best way to ensure all the carbonate has decomposed is to heat to constant mass (which means to repeatedly heat and cool, weigh, heat, cool, weigh ? until no further change is mass is seen. ...read more.

Middle

Mortar consists of cement mixed with calcium hydroxide. This makes a smooth slow setting mixture suitable for bricklaying Glass is made by heating a mixture of limestone, sand and soda (sodium carbonate).This reaction requires a lot of energy. Recycling glass reduces the amount of energy needed to produce new glass products and also uses less raw materials slaked lime (calcium hydroxide) is used to reduce the acidity of soil. evaluate the developments in using limestone, cement, concrete and glass as building materials, and their advantages and disadvantages over other materials. Limestone: Some possible points Limestone is beautiful Limestone suffers badly with acid rain easy to cut but there is a fair amount of waste in cutting to shape no processing needed so low energy costs required to use as stone Widely available/abundant Cement and Concrete: Some possible points Concrete is long lasting and does not corrode or rot ...read more.

Conclusion

cement produces huge amounts of CO2 greenhouse gas Reactions of carbonates with acid Carbonates react with acids to produce carbon dioxide, a salt and water. Hydrochloric acid will make a chloride salt CaCO3 + 2HCl ï CaCl2 + H2O + CO2 Here the salt made is calcium chloride Sulphuric acid will make a sulphate salt CuCO3 + H2SO4ï CuSO4 + H2O + CO2 Here the salt made is copper sulphate Limestone is damaged by acid rain. Learn this equation: Calcium carbonate ï Calcium oxide + carbon dioxide CaCO3 ï CaO + CO2 Learn this equation: Calcium oxide + water ï calcium hydroxide CaO + H2O ï Ca(OH)2 Understand this reaction (don’t need to remember) Calcium hydroxide can react with carbon dioxide to produce solid calcium carbonate. Ca(OH)2 + CO2 ï CaCO3 + H2O This is the reaction that makes limewater go cloudy when CO2 is bubbled through it ...read more.

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