key points on rocks, metals and building
- Created by: Alice
- Created on: 02-06-11 15:39
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atoms, elements and compunds
- all substances are made up of atoms
- elements contain only one types of atom
- different atoms can bond together by giving, taking or sharing electrons to form compunds
limestone and its uses
- limestone is mainly made of calcuim carbonate
- limestone is widely used in building
- limestone breaks down when its heated strongly (thermal decomposition) to make quicklime and carbon dioxide
decomposing carbonates
- some carbonates decompose when they are heated in a bunsen flame
- there is the same number of atoms in each side of a blalnced chemical equation
- the mass of reactants is the same as the mass of the products in a chemical reaction
quicklime and slaked lime
- when water is added to quicklime it produces slaked lime
- lime mortar is made by mixing slaked lime with sand and then adding water
cement concrete and glass
- cement is made by heating limestone with clay in a kiln
- concrete is made by mixing chrushed rocks, cement and sand with water
- glass is made by strongly heating powdered limestone, sand and sodium carbonate together.
extracting metals
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