Year 9 Separating techniques, potable water 2025

Last updated about 2 hours ago

30 questions

Introduction

1

7

5

2

Library

Year 9 Separating techniques, potable water 2025

Last updated about 2 hours ago

30 questions

Introduction

1

The stationary phase is the __________  (actually the water adsorbed onto the surface of the paper).
The mobile phase is the ____________. 

Other Answer Choices:

solvent

paper

1

An unknown sample can be identified because: The _________  for the unknown sample are at the same height as the _________  for the __________  sample on the _________________ 

Other Answer Choices:

dots

known

chromatogram

1

7

5

Draggable item		Corresponding Item

2

Suggest one process a different country, which has very little rainfall, a long coastline, and plentiful energy supplies, could use to obtain most of its potable water.
Simple __________________ of ______________ 

Other Answer Choices:

Distillation

sea water

What word in chemistry means containing one type of particle only? (1 Point)

Pure

Mixture

Compound

Element

What word in chemistry means containing more than one type of particle jumbled together? (1 Point)

Pure

Mixture

Compound

Element

What word in chemistry means containing one type of atom only? (1 Point)

Pure

Mixture

Compound

Element

What word in chemistry means containing two or more different elements chemically joined together in a fixed ratio? (1 Point)

Pure

Mixture

Compound

Element

Pure substances have a sharp melting point.

True

False

Pure substances melt over a range of temperatures.

True

False

Which statement is correct? (1 Point)

Mixtures have a sharp melting point.

Mixtures melt over a range of temperatures.

Which method would be used to get sodium chloride from salt water?

Which method would be used to separate sand from water? (1 Point)

Which method would be used to separate ethanol from water?

Which method would be used to separate ammonia from nitrogen and hydrogen?

Which method would be used to separate pure water from sea water?

Which method would be used to separate food colourings? (1 Point)

Which method would be used to separate dyes? (1 Point)

The stationary phase is the __________  (actually the water adsorbed onto the surface of the paper).
The mobile phase is the ____________. 

Other Answer Choices:

solvent

paper

As the solubility of the substance increases, the distance travelled by the substance ____________.

Increases

Decreases

Stays the same

As the solubility of the substance increases, the Rf value of the substance ____________.

Increases

Decreases

Stays the same

How can an impure substance be identified on a chromatogram?

One dot only

More than one dot

How can a pure substance be identified on a chromatogram?

One dot only

More than one dot

An unknown sample can be identified because: The _________  for the unknown sample are at the same height as the _________  for the __________  sample on the _________________ 

Other Answer Choices:

dots

known

chromatogram

Which is the correct equation for Rf?

Rf = sample height / solvent height

Rf = solvent height / sample height

Rf = sample height x solvent height

Rf = sample height + solvent height

To make water drinkable is to make water:

Solids settle to the bottom of the water during:

Sea water can be purified using _________________________ (1 Point)

Distillation

Chlorination

Filtration

Sedimentation

Solids settle to the bottom of the water during _____________________ (1 Point)

Distillation

Chlorination

Filtration

Sedimentation

Solid impurities are removed using _____________________________

Distillation

Chlorination

Filtration

Sedimentation

a

b

c

d

You need to copy out these steps into your book.

Chemical such as aluminium sulfate are added to cause flocculation (clumping together) of fine grained suspended particles (4)
Large insoluble impurities are removed by screens (2)
Bacterial and or viruses are killed using - chlorine / UV light /ozone (6)
Smaller insoluble impurities sediment out of the water (3)
Firstly water is collected in a reservoir (1)
Remaining insoluble material is removed by filtration using gravel and sand (5)
Finally pH is tested and water is neutralised if needed. (7)

Match up the technique and the example.

Draggable item		Corresponding Item
evaporation/crystallisation		Separate the food colourings in a sweet
fractional distillation		Obtain salt from a solution of salty water
filtration		Separate various fractions of crude oil
simple distillation		Obtain sand from a mixture of sand and water
chromatography		Obtain water from salt water

Suggest one process a different country, which has very little rainfall, a long coastline, and plentiful energy supplies, could use to obtain most of its potable water.
Simple __________________ of ______________ 

Other Answer Choices:

Distillation

sea water

What word in chemistry means containing one type of particle only? (1 Point)

Pure

Mixture

Compound

Element

What word in chemistry means containing more than one type of particle jumbled together? (1 Point)

Pure

Mixture

Compound

Element

What word in chemistry means containing one type of atom only? (1 Point)

Pure

Mixture

Compound

Element

What word in chemistry means containing two or more different elements chemically joined together in a fixed ratio? (1 Point)

Pure

Mixture

Compound

Element

Pure substances have a sharp melting point.

True

False

Pure substances melt over a range of temperatures.

True

False

Which statement is correct? (1 Point)

Mixtures have a sharp melting point.

Mixtures melt over a range of temperatures.

Which method would be used to get sodium chloride from salt water?

a) Simple distillation

b) Fractional distillation

c) Filtration

d) Crystallisation / Evaporation

e) Paper chromatography

Which method would be used to separate sand from water? (1 Point)

a) Simple distillation

b) Fractional distillation

c) Filtration

d) Crystallisation / Evaporation

e) Paper chromatography

Which method would be used to separate ethanol from water?

a) Simple distillation

b) Fractional distillation

c) Filtration

d) Crystallisation / Evaporation

e) Paper chromatography

Which method would be used to separate ammonia from nitrogen and hydrogen?

Simple distillation

Fractional distillation

Filtration

Crystallisation / Evaporation

Paper chromatography

Which method would be used to separate pure water from sea water?

Simple distillation

Fractional distillation

Filtration

Crystallisation / Evaporation

Paper chromatography

Which method would be used to separate food colourings? (1 Point)

Simple distillation

Fractional distillation

Filtration

Crystallisation/Evaporation

Paper chromatography

Which method would be used to separate dyes? (1 Point)

Simple distillation

Fractional distillation

Filtration

Crystallisation/Evaporation

Paper chromatography

As the solubility of the substance increases, the distance travelled by the substance ____________.

Increases

Decreases

Stays the same

As the solubility of the substance increases, the Rf value of the substance ____________.

Increases

Decreases

Stays the same

How can an impure substance be identified on a chromatogram?

One dot only

More than one dot

How can a pure substance be identified on a chromatogram?

One dot only

More than one dot

Which is the correct equation for Rf?

Rf = sample height / solvent height

Rf = solvent height / sample height

Rf = sample height x solvent height

Rf = sample height + solvent height

To make water drinkable is to make water:

Potable

Chlorination

Filtration

Sedimentation

Distillation

Solids settle to the bottom of the water during:

Potable

Chlorination

Filtration

Sedimentation

Distillation

Sea water can be purified using _________________________ (1 Point)

Distillation

Chlorination

Filtration

Sedimentation

Solids settle to the bottom of the water during _____________________ (1 Point)

Distillation

Chlorination

Filtration

Sedimentation

Solid impurities are removed using _____________________________ 

Distillation

Chlorination

Filtration

Sedimentation

a

b

c

d

You need to copy out these steps into your book.

Chemical such as aluminium sulfate are added to cause flocculation (clumping together) of fine grained suspended particles (4)

Large insoluble impurities are removed by screens (2)

Bacterial and or viruses are killed using - chlorine / UV light /ozone (6)

Smaller insoluble impurities sediment out of the water (3)

Firstly water is collected in a reservoir (1)

Remaining insoluble material is removed by filtration using gravel and sand (5)

Finally pH is tested and water is neutralised if needed. (7)

Match up the technique and the example.

evaporation/crystallisation

Separate the food colourings in a sweet

fractional distillation

Obtain salt from a solution of salty water

filtration

Separate various fractions of crude oil

simple distillation

Obtain sand from a mixture of sand and water

chromatography

Obtain water from salt water