Crystallisation can be used to separate a solid solute from its solvent. Re-crystallisation is used to purify samples obtained in the laboratory. But what is a crystal?
A 50% yield
In this section we consider how much product is formed by a chemical reaction . Some reaction processes are not very efficient and only a small proportion of the reactants are actually turned into the products. The yield of a chemical reaction is the amount of product obtained. It is usually expressed as a perce...
Students should: 1.10 describe these experimental techniques for the separation of mixtures: simple distillation fractional distillation filtration crystallisation paper chromatography Each technique listed here is a method which can be used for the separation of mixtures of substances. Work through each method in turn . 1.10 Simple distillat...
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Water is an odourless, colourless liquid. So are many other chemicals .
Introduction Water has no obvious smell. Water has no taste and water is colourless. Water has a neutral pH value ( pH 7). Many other chemical substances have similar properties . We therefore need to find a chemiscal test for water. Enter your text here ... When water is added to anhydrous (white) copper sulfate the copper s...
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To test the effect of particle size on the rate of oxidation we prepared three samples of steel wool each with different levels of coarseness (shown left). The test tube on the left contains the fine steel wool while the one in the middle contains the medium conciseness steel wool and the test tube on the right contains the coarsest stee...
Introduction Hydrogen is a flammable gas. It burns in air to produce water. A convenient test for hydrogen is to put a lighted splint in the mouth of a test tube full of the gas . The gas will burn with a characteristic squeaky pop if hydrogen is present. Hydrogen gas can be used as a fuel. When hydrogen burns in air it combines with ox...
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Sun, sea, sand and air. Elements, compounds or mixtures?