IQ1

Question 1

Filtration

Answer 1

Seperation based on physical property of particle size. Solution passes through ilter, suspended solid remains on top. Liquid that passes through is the filtrate.

Question 2

Seperation based on boiling points

Answer 2

Since liquid has a lower boiling point than solid the liquid can be vaporised. Useful to obtain the solid. Done by either evaporation or vaporisation. Separation based on the physical property of boiling point.

Question 3

Sedimentation and decanting

Answer 3

Solids settle to the bottum. Process of pouring off liquid and leaving solid undisturbed. Separation based on the physical property of Density.

Question 4

Centrifuging

Answer 4

Seperates substances based on density. Heavier particle move to the bottum where as lighter ones stat on top. E.g seperating blood components. Separation based on the physical property of Density.

Question 5

Distillation

Answer 5

Solution boiled with the vapour formed being condensed back into a liquid. Liquid becomes the distillate. If impurities non-volatile is beomces pure. 2 or more liquid can be seperated if boiling points and different. If boiling points are close than distillate will not be pure. Separation based on the physical property of boiling point.

Question 6

Fractional Distillation

Answer 6

Mixture of liquid with close boiling points seperated by successive distillations from 10 to 100. E.g seperation of crude oils in e.g fuel production. Separation based on the physical property of Boiling points.

Question 7

Separating Immiscible liquids.

Answer 7

Immiscible liquids don’t form a homogeneous mixture as the density’s are different. Hence, they settle into layers. Opening the tap can let out the lower level. Separation based on the physical property of Density

Question 8

Sieve

Answer 8

Larger solids stay in sieve where as smaller solids fall through. Separation based on the physical property of particle size.

Question 9

Magnetism

Answer 9

Magnet pulls out metal within a mixture. Separation based on the physical property of Magnetism

Question 10

Gravimetric Analysis

Answer 10

Separating the components of a mixture and accurately determining their mass so the percentage composition can be analysed.

Question 11

Gravimetric analysis

Answer 11

Qualitative composition of a mixture. Mass of each substance present. Percentage composition.
Reasons could include:
Mining,
Medicine compounds.

Question 12

Characteristics of medals

Answer 12

Solids at room temperature
Having a shiny or lustrous appearance.
Good conductors
Malleable
Ductile

Question 13

Characteristic of non-metal

Answer 13

Solids and gases at room temp
Generally have a dull non-lustruous appearance
are generally poor conductors of heat and electricity
Are neither malleable nor ductile.

Question 14

Semi-metals

Answer 14

Elements that have characteristics of both non-metals and metals.

Question 15

Periodic table

Answer 15

Verticle columns= groups
horizontal rows= Periods.