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| Questão | Responda |
| what is healthier to drink-hard or soft water? | hard water, as it contains calcium compounds that are good for the development of bones |
| How is drinking water treated to make it safe? | by sedimentation and filtration to remove solids. followed by disinfection to kill microbes, chlorine is used to kill microbes |
| why is distillation not used to treat mains tap drinking water? | distillation is expensive as it requires a large amount of energy to boil the water and there fore would not be appropriate |
| one advantage of softening water | it is important as hard water causes problems in heating systems and with washing |
| one advantage of hard water | has health benefits |
| what would be the consequences of not adding chlorine or flouride to tap water? | no chlorine would mean increased health risks, more spreading of decease. no Florine would mean tooth decay or poor dental health |
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