2051479
Description
Flashcards by James Middleton7674, updated more than 1 year ago
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Created by James Middleton7674
almost 10 years ago
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| Question | Answer |
| What are the four main sources of water? | Rivers, lakes, reservoirs and aquifers (wells and bore holes). |
| Name one thing that water is important for apart from drinking, washing and other jobs in the home? | Used for the chemical industry in large amounts for cooling, as a solvent and as a cheap raw material |
| What can untreated water contain? | insoluble particles, pollutants microbes and dissolved salts and minerals. |
| What would happen in a typical water treatment process? | Sedimentation - the water settles to allow the insoluble particles to sink Filtration - to remove very fine particles Chlorination - to kill the micro-organisms in the water |
| What is one advantage and one disadvantage with distillation? | Advantages - Gets rid of any soluble materials which could be poisonous Disadvantage - Lots of energy used so a very expensive process |
| Why don't we use sea water as drinking water? | The process of distillation would cost more than it is worth as it would require huge amounts of energy to heat it. |
| What kind of pollutants can be found in water? | Pesticides from spraying crops near to water supply, lead from old piping, nitrates from the run off of fertilisers. |
| The dissolved ions of some salts are easy to identify as they will undergo precipitation reaction. A precipitation reaction occurs when an insoluble solid is made from mixing two solutions together. Sulphates can be detected using barium chloride solution. What colour is the precipitate? | white |
| Silver nitrate solution is used to detect halide ions. Halides are ions made by the halogens. With silver nitrate what colour precipitates do chlorides, bromides and iodides form? | chlorides - white precipitate bromides - cream precipitate iodides - pale yellow precipitate |
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