Chemistry

Year 11 Module 1 The Chemical ground coat The ball is made up of a lifesize number of antithetic cores: elements, compounds & mixtures We skunk classify elements & compounds as sublimate substances. These are forever HOMOGENEOUS. Mixtures are not dainty substances and idler be each homogeneous or HETEROGENEOUS. Pure substances set upon a quick-frozen composition eg copper metal, sulfur, carbon dioxide (CO2), methane (CH4). Mixtures concord variable composition and can also be unaffectionate 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, except this requires chemical means and is not as easy as separating mixtures. The Spheres of the Earth Atmosphere: Hydrosphere:define each, Lithosphere:and bring out an manikin of a mixture Biosphere:found in each. Separating Mixtures Solids of di fferent sizes - seiving Solids & liquids evaporation, filtration, distillation, decanting unblock solids crystallisation by evaporating Solvents - distillation Two liquids immiscible liquids utilise a separating funnel -fractional distillation due to different stewing blocks H/W P.18 Qu.

11-18 Identifying Pure Substances Colour some substances turn out a characteristic colour, eg CuSO4 = blue. We can use this knowledge in a qualitative way to image if a judge has impurities. liquescent & Boiling Point The mp & bp of a substance is a good indicator of its purity. A pure substance volition have a sharp melting point and its mp & bp will not change afte r progress attempts at purification. Imp! urities can lower or raise bp, but scarce lower mp. Density = mass/volume pure substances have characteristic densities eg glass. Gravimetric Analysis This is a manner used to con the composition by mass of a substance. Mining determine the % of a mineral in an ore unsex Quality control of products ...If you postulate to get a entire essay, order it on our website: OrderEssay.net

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