Quiz
GCSE AQA Chemistry Unit 3 Water Quiz
Perguntas do quiz (16)
1Soft water lathers easily with soap
- AVerdadeiro
- BFalso
2What does hard water produce when it reacts with soap?
- AScale
- BScum
3What ions does hard water contain?
- ACalcium and magnesium
- BCarbon and potassium
4Temporary hard water produces scale when heated
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- BFalso
5What does scale do?
- AReduce the efficiency of heating systems and cause blockages
- BEvaporate when heated
6How are calcium compounds good for our health?
- AHelp develop strong bones and teeth. May reduce the risk of heart disease.
- BThey do not have any particular health benefits
- CHelp with fighting infection
7Permanent hard water is not softened by boiling and does not produce scale when heated
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- BFalso
8Washing soda is sodium carbonate
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- BFalso
9How are ions precipitated out of hard water?
- ASodium carbonate reacts with the magnesium and calcium ions in the hard water to form calcium carbonate and magnesium carbonate that will not react with water
- BFiltration
- CSodium carbonate displaces the magnesium and calcium ions so the hard water turns soft
10Ion exchange columns contain a resin made of sodium and hydrogen ions
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- BFalso
11How do ion exchange columns work?
- AThe calcium and magnesium ions attach to the resin and the water no longer contains any ions
- BThe hard water is passed through the exchange column. The calcium and magnesium ions become attached to the resin and the sodium and hydrogen ions take their place in the water. These ions do not react with soap
12What methods are used to treat water
- ASedimentation and filtration to remove solids
- BEvaporation and distillation
13Why is chlorine used in the treatment of water
- ABecause it is a law
- BBecause chlorine kills microbes in the water
14What are the issues with using chlorine to treat water?
- AIt is poisonous and can produce toxic compounds
- BIt is very expensive
15Why is fluoride added to water?
- ATo prevent tooth decay
- BIt is added by the government to control the population
- CTo help prevent heart disease
16Some people think that you should be able to choose whether or not to have fluoride in your water
- AVerdadeiro
- BFalso
Informações
- Descrição
- Quiz sobre GCSE AQA Chemistry Unit 3 Water Quiz, criado por Jamie Caffey em 10-04-2015.
- Autor
- Jamie Caffey
- Idioma
- English
- Visualizações
- 12
- Etiquetas
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