Chromatography, Distillation, And Mixtures (paper1)

Question 1

What equipment is used in chromatography

Answer 1

Beaker, rod, paper, pencil, solvent

Question 2

How do you calculate the rf value

Answer 2

Distance moved by the spot divided by distance moved by solvent

Question 3

What is the rf value less than

Answer 3

1

Question 4

What’s potable water

Answer 4

Clean, no added things water

Question 5

What is used in distillation

Answer 5

Thermometer, distillation column, flask, Bunsen burner, condenser and receiver

Question 6

Can the composition of a pure substance be changed

Answer 6

No

Question 7

What can be pure

Answer 7

Compounds and elements

Question 8

What is melting point an example of

Answer 8

Physical property

Question 9

What’s a filtrate

Answer 9

The bits of soluble solute and solution that have passed through the filter paper

Question 10

What is a residue

Answer 10

Bits of insoluble solution that can’t pass through the filter paper

Question 11

What do we do to a filtrate to make crystals

Answer 11

Heat it gently with a Bunsen burner

Question 12

What does a risk assessment identify

Answer 12

Hazards and risks during an experiment

Question 13

What is melting point an example of

Answer 13

Physical property

Question 14

What happens if crystals are formed slowly

Answer 14

The particles have a longer time to make an ordinary pattern therefore making larger crystals

Question 15

How is table salt produced

Answer 15

By evaporating sea water or extracting it from the ground using solution mining

Question 16

What is solution mining

Answer 16

Where water is pumped into layers of salt underground. This solution is then evaporated.

Question 17

What is saturated solution

Answer 17

The maximum amount of solute that can dissolve in a solvent at that temp.

Question 18

What’s a filtrate

Answer 18

The bits of soluble solute and solution that have passed through the filter paper

Question 19

What is a residue

Answer 19

Bits of insoluble solution that can’t pass through the filter paper

Question 20

What do we do to a filtrate to make crystals

Answer 20

Heat it gently with a Bunsen burner

Question 21

What does a risk assessment identify

Answer 21

Hazards and risks during an experiment

Question 22

What is producing pure water from sea water called

Answer 22

Desalination

Question 23

What does chemical analysis involve

Answer 23

Using chemical reactions to identify substances in a sample

Question 24

What can tap water form in reactions

Answer 24

Unexpected cloudy precipitates

Question 25

What’s an aquifer

Answer 25

Underground rocks that contain groundwater

Question 26

What impurities can be found in raw water

Answer 26

Twigs or leaves, harmful bacteria or insoluble particles such as grit

Question 27

What is chlorination

Answer 27

When chlorine is added to water to kill microorganisms

Question 28

What are other ways that impurities are treated to in water

Answer 28

Sedimentation or filtration

Question 29

What happens when a solid melts

Answer 29

Energy overcomes weak forces between particles and they move further away to become a liquid

Question 30

What is a melting point

Answer 30

The temp at which enough energy is provided to overcome forces of attraction

Question 31

What is solution mining

Answer 31

Pumping water into layers of salt underground then evaporating

Question 31

What is a saturated solution

Answer 31

The max solute dissolved in a solvent at that temp