freezing point of water is, 100 OC, 0 0C, boiling point of water is , 100 OC, 0 0C, Which substance changes from blue to pink when water is present?, Anhydrous cobalt(II) chloride, Anhydrous copper(II) sulfate, Which substance changes from white to blue when water is present?, Anhydrous copper(II) sulfate, Sodium chloride, Pure water has a fixed boiling point of 100 °C and melting point of 0 °C. This helps to test:, The colour of water, The purity of water, Why is distilled water used in practical chemistry instead of tap water?, It contains fewer chemical impurities, It contains more minerals, Water from natural sources may contain dissolved oxygen., True, False, Which of the following may be present in natural water?, Metal compounds, Pure gold, Which of the following can be found in polluted natural water?, Plastics, Diamonds, Dissolved oxygen in water is important for:, Aquatic life, Making water colourful, Some metal compounds in water are useful because they:, Provide essential minerals for life, Make water taste sweet, Why is sewage dangerous in water?, It contains harmful microbes that cause disease, It makes water colder, Nitrates and phosphates from fertilisers can cause:, Deoxygenation of water and harm aquatic life, Water to become completely pure.
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Water
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