Chemistry

Year 11 Module 1 The Chemical underseal coat The cosmos is made up of a bighearted number of antithetic amount of moneys: elements, compounds & mixtures We skunk classify elements & compounds as virgin amount of moneys. These are forever HOMOGENEOUS. Mixtures are not unalloyed substances and house be each homogeneous or HETEROGENEOUS. Pure substances stimulate a quick-frozen composition eg copper metal, sulfur, carbon dioxide (CO2), methane (CH4). Mixtures entertain variable composition and can also be free into its components relatively easily. Eg. Alloys brass Cu: 65% Zn 35% Elements are pure substances that cannot be broken down into some(prenominal) other substance. Compounds can be broken down, besides this requires chemical substance means and is not as easy as separating mixtures. The Spheres of the Earth Atmosphere: Hydrosphere:define each, Lithosphere:and bring out an suit of a mixture Biosphere:found in each. Separating Mixtures Solids of different sizes - seiving Solids & liquids evaporation, filtration, distillation, decanting resolve solids crystallisation by evaporating Solvents - distillation Two liquids immiscible liquids use a separating funnel -fractional distillation due to different boil smears H/W P.18 Qu.

11-18 Identifying Pure Substances Colour some substances gestate a characteristic colour, eg CuSO4 = blue. We can use this knowledge in a qualitative way to image if a model has impurities. liquescent & Boiling Point The mp & bp of a substance is a good indicator of its purity. A pure substance voliti on have a sharp melting point and its mp & b! p will not change after shape up attempts at purification. Impurities can lower or raise bp, but scarce lower mp. Density = mass/volume pure substances have characteristic densities eg glass. Gravimetric Analysis This is a method used to con the composition by mass of a substance. Mining determine the % of a mineral in an ore pay back Quality control of products ...If you postulate to get a generous essay, order it on our website: BestEssayCheap.com

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