BWS GCSE Chemistry Water

To be described as potable water must not contain any dissolved salts

• True

• False

Tags

NGSS.HS-ESS2-5

Which process produces sewage sludge and effluent during sewage treatment

• Screening

• Aerobic digestion

• Sedimentation

• Anaerobic digestion

Tags

NGSS.HS-ETS1-3

What useful gas is produced as a result of anaerobic digestion of sludge produced during sewage treatment

• Oxygen

• Helium

• Carbon Dioxide

• Methane

Tags

NGSS.HS-LS2-3

A disadvantage of obtaining potable water from treated sewage is that it requires more processes than treating fresh water.

• True

• False

Tags

NGSS.HS-ETS1-3

Waste water containing toxic substances can be treated by.....

• UV radiation

• IR radiation

• adding chemicals to precipitate out the toxin

• using membranes

Tags

NGSS.HS-ETS1-1

NGSS.HS-ETS1-3

Fresh water is treated to make it potable by which of the following processes. There maybe more than one....

• filtration

• removal of ions like Ca²⁺ or Na⁺

• sterilisation

• aerobic digestion

Tags

NGSS.HS-ETS1-3

NGSS.HS-PS1-6

To sterilise water to make it potable, you can use.....

• chlorine

• fluoride

• ozone

• UV light

• Visable light

Tags

NGSS.HS-ESS2-5

The main disadvantage of desalination is .........

• It requires a considerable amount of energy

• It can provide water for countries where there isn't much fresh water

• It uses membranes to separate the salt ions from the water

• It is a continuous process

Tags

NGSS.HS-ETS1-3

As an alternative to using reverse osmosis, desalination can be done by.......

• Filtration

• Crystallisation

• Distillation

• Diffusion

Domestic, agricultural and industrial waste water is treated to remove ...............

• Organic matter

• Microbes

• harmful chemicals

• dissolved ions

Tags

NGSS.HS-ESS3-4

NGSS.HS-LS2-7