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Chemistry- Unit 3 Chemical Changes, Reactivity Series, Neutralisation, pH…
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Reactivity Series
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Group 2, lose 2 electrons
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pH Scale
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When you put universal indicator in the solution it turns warm colours (yellow, red ect.)
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When you put the universal indicator in the solution it turns cold colours (blue, purple ect.)
When pH is 7 it is neutral, the colour is green
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Strong and Weak Acids
Strong Acid
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e.g Hydrochloric acid HCl, Sulfuric acid H2SO4, Nitric acid HNO3
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Weak Acid
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e.g ethanoic acid, citric acid
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As the pH decreases by one unit, the H+ concentration increases 10 times
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Oxidation - Loss of electrons, loss in hydrogen, gain in oxygen
Reduction - Gain of electrons, gain of hydrogen, loss of oxygen
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