OCR C2 Revision Flashcards: Amy and Lacey - Construction materials 0.0 / 5 ? ScienceChemistryGCSEOCR Created by: xamyxkellyxCreated on: 01-06-16 11:44 How do you compare hardness of raw materials? Rub them together 1 of 7 Which raw materials make cement? Limestone and clay 2 of 7 What types of rock are the following?: Limestone, Marble and Granite Sedimentary, metamorphic and igneous. 3 of 7 What is thermal decomposition? A reaction in which heat causes a substance to break down and form two new substances. 4 of 7 What is the word equation for the thermal decomposition of calcium carbonate (limestone)? calcium carbonate -> calcium oxide + carbon dioxide 5 of 7 How is concrete made? The how does it become reinforced concrete? Concrete is made when cement, sand and small stones are mixed with water. It is then reinforced by running steel rods or meshes through it. 6 of 7 When is concrete strong and when is it weak? It is strong under compression and weak under tension (pulling) 7 of 7
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