Flashcards
C4H Purifying and Testing Water
Flashcards do conjunto (9)
- 1What are the four main sources of water?Rivers, lakes, reservoirs and aquifers (wells and bore holes).
- 2Name 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
- 3What can untreated water contain?insoluble particles, pollutants microbes and dissolved salts and minerals.
- 4What 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 - 5What 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 - 6Why 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.
- 7What 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.
- 8The 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
- 9Silver 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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- FlashCards sobre C4H Purifying and Testing Water, criado por James Middleton7674 em 17-02-2015.
- Criado por
- James Middleton7674 · fev 2015
- Atualizado
- 7 mar 2018
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