Using the Earth's resources and obtaining potable water

Question 5

Medium

This question is about treating and testing water.

A water quality monitoring station is testing a local water supply after an agricultural runoff incident introduced copper(II) sulfate ( $CuSO4\text{CuSO}_4$ ) into a regional reservoir.

Draw one line from each treatment step to the main reason for that step.

Step:
- Filtration
- Sedimentation
Reason for step:
- Allow heavy suspended solids to settle to the bottom
- Remove fine suspended particles by passing water through sand beds
- Add fluoride to protect teeth
- Destroy harmful bacteria

[2]

Which two of the following agents are commonly used to sterilise fresh drinking water? Choose two options.

Chlorine
Argon
Ultra-violet (UV) light
Sulfur dioxide
Nitrogen gas

[2]

Which two methods can demonstrate that a sample of water is chemically pure (i.e. contains absolutely no dissolved solids)?

Determine if the liquid boils at exactly $100∘C100^\circ\text{C}$ at standard pressure.
Determine if the liquid freezes at exactly $0∘C0^\circ\text{C}$ at standard pressure.
Check if the liquid turns anhydrous copper(II) sulfate blue.
Add universal indicator to see if it turns green.

[2]

Separate samples are tested to identify the ions present in the copper(II) sulfate contaminant. Draw one line from each ion to the correct chemical reagent needed to identify it.

Ion:
- Copper(II) ion ( $Cu2+\text{Cu}^{2+}$ )
- Sulfate ion ( $SO42−\text{SO}_4^{2-}$ )
Reagent:
- Acidified barium chloride solution
- Sodium hydroxide solution
- Acidified silver nitrate solution
- Dilute hydrochloric acid

[2]

How can pure water be produced from a sample of water containing dissolved solids?

Chromatography
Decanting
Simple distillation
Filtration

[1]

Using the Earth's resources and obtaining potable water

1 2 3 4 5 6 7

Question 5

Medium

This question is about treating and testing water.

A water quality monitoring station is testing a local water supply after an agricultural runoff incident introduced copper(II) sulfate ( $CuSO4\text{CuSO}_4$ ) into a regional reservoir.

Draw one line from each treatment step to the main reason for that step.

Step:
- Filtration
- Sedimentation
Reason for step:
- Allow heavy suspended solids to settle to the bottom
- Remove fine suspended particles by passing water through sand beds
- Add fluoride to protect teeth
- Destroy harmful bacteria

[2]

Which two of the following agents are commonly used to sterilise fresh drinking water? Choose two options.

Chlorine
Argon
Ultra-violet (UV) light
Sulfur dioxide
Nitrogen gas

[2]

Which two methods can demonstrate that a sample of water is chemically pure (i.e. contains absolutely no dissolved solids)?

Determine if the liquid boils at exactly $100∘C100^\circ\text{C}$ at standard pressure.
Determine if the liquid freezes at exactly $0∘C0^\circ\text{C}$ at standard pressure.
Check if the liquid turns anhydrous copper(II) sulfate blue.
Add universal indicator to see if it turns green.

[2]

Separate samples are tested to identify the ions present in the copper(II) sulfate contaminant. Draw one line from each ion to the correct chemical reagent needed to identify it.

Ion:
- Copper(II) ion ( $Cu2+\text{Cu}^{2+}$ )
- Sulfate ion ( $SO42−\text{SO}_4^{2-}$ )
Reagent:
- Acidified barium chloride solution
- Sodium hydroxide solution
- Acidified silver nitrate solution
- Dilute hydrochloric acid

[2]

How can pure water be produced from a sample of water containing dissolved solids?

Chromatography
Decanting
Simple distillation
Filtration

[1]

Using the Earth's resources and obtaining potable water

Question 5

Using the Earth's resources and obtaining potable water Questions

Using the Earth's resources and obtaining potable water

Question 5

Using the Earth's resources and obtaining potable water Questions