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a) i) Pure substance Mixture Composition variable Properties fixed and constant variable the components retain their individual properties (3) ii) An element is a pure substance that cannot be broken down into any simpler substances by any ordinary chemical or physical means. Answer 2: Nicknames for utvsA2 Mixtures and separations 1. That is, if you think you have some hematite, rub the mineral on an unglazed ceramic tile (called a streak plate) and the streak is blood red. Rust on the other hand is ferric oxide or Fe 2 O 3. Gold, symbol Au is atomic number 79 and is like diamond, a pure substance. Molar concentration gives the number of moles of the substance per unit volume in the mixture. Typically, in chemistry experiments, concentrations are expressed in g cm-3. For instance, if you dissolve 5.00 g of pure table salt (NaCl) in water to get a salt solution of 100 cm 3, then the concentration of salt in the solution is 5o.0 kg m-3.The information in this MRL serves as a screening tool to help public health professionals decide where to look more closely to evaluate possible. The MRL is an estimate of the daily human exposure to a hazardous substance that is likely to be without appreciable risk of adverse, non-cancer health effects over a specified duration of exposure.
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