AQA chemistry C3

1. 1Why is fluoride often added to drinking water?
   [blank_start]To improve dental health[blank_end]

   1. ATo improve dental health
   2. BSafety
2. 2Two compounds that cause hard water is ..
   [blank_start]Calcium[blank_end] and [blank_start]magnesium[blank_end]

   1. Amagnesium
   2. BCalcium
3. 3Why is hard water good for people's health?

   1. A- Good for the heart/ reduces heart disease
   2. BContains Ca²⁺ ions which helps to make stronger teeth and bones
   3. CBecause it is hard
4. 4Disadvantages of hard water includes:

   1. AProduces limescales (eg. in kettles, washing machines etc) which decreases the efficiency of appliances.
   2. BProduces scum so more soap is needed to give a lather
   3. CCost of needing to soften the hard water
   4. DBad for the heart
5. 5The hard water reacts with the soap to form scum

   1. ATrue
   2. BFalse
6. 6Why do you need to use more soap to form a lather when using hard water?

   1. AThe hard water reacts with the soap to form scum
   2. BBecause it's harder so require more to lather
7. 7Methods for removing the hardness in water. Pick three

   1. ADistillation
   2. B- Ion exchange column
   3. C- Reacting with sodium carbonate/washing soda
   4. DCleaning
8. 8A soapy soap is liquidy and can be found in bottles

   1. ATrue
   2. BFalse
9. 9Some argue that Chlorine is toxic/harmful

   1. ATrue
   2. BFalse
10. 10Benefits to adding chlorine to drinking water. (3 Marks)

    1. AOnly a small amount of chlorine is needed for these beneficial effects
    2. BPrevents disease/illness (eg. cholera)
    3. CKills microbes/bacteria.
    4. DTates good

11. 11Arguments against adding chlorine to drinking water
    [blank_start]Chlorine is toxic/harmful[blank_end], [blank_start]Unethical[blank_end] (no choice given to individuals whether they want it or not)
    
    

    1. AChlorine is toxic/harmful
    2. Bagainst God
    3. CUnethical
    4. Dcostly
12. 12In the UK Filtration is used to remove insoluble substances / solids.

    1. ATrue
    2. BFalse
13. 13Describe and explain the two main steps in water treatment in the UK

    1. AAdd chlorine to kill bacteria
    2. BCleansing
    3. CFiltration to remove insoluble substances / solids
14. 14Explain how adding sodium carbonate softens permanent hard water.
    The [blank_start]sodium[blank_end] carbonate reacts with the [blank_start]calcium/magnesium[blank_end] ions that make water hard to form a [blank_start]precipitate[blank_end] of calcium/magnesium carbonate that can be removed.

    1. Asodium
    2. Bcalcium/magnesium
    3. Cprecipitate
15. 15Why do you have to pass a sodium chloride solution through the ion exchange column every few weeks?
    
    To [blank_start]replenish[blank_end] the lost sodium ions in the [blank_start]resin[blank_end]
    
    
    

    1. Areplenish
    2. Bresin
16. 16Boiling cannot remove temporary hardness in hard water?

    1. ATrue
    2. BFalse
17. 17You can remove temporary hardness in water through distillation?

    1. ATrue
    2. BFalse
18. 18You can remove temporary hardness in water through ion exchange?

    1. ATrue
    2. BFalse
19. 19You cannot remove temporary hardness in water by reacting with sodium carbonate/washing soda

    1. ATrue
    2. BFalse
20. 20You can investigate the hardness of water by measuring conductivity. Using a conductivity sensor.

    1. ATrue
    2. BFalse

Description

AS level Chemistry Quiz on AQA chemistry C3, created by Jacqueline Adjei on 01/02/2017.

Author

Jacqueline Adjei

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English

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Created on 1 Feb 2017 · updated on 1 Feb 2017

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