Separtaion Of Mixture Flashcards
State two things the student could do to make the salt dissolve quickly
Heat and stir
State what the student should do next to separate the sand from the salt solution
Filter
Explain why it’s nessacry for water to flow continuously in and out of the apparatus condenser in simple distillation
To cool so steam condenses
Method separte sand from salt solution
Crystillastion
Why can ethanol and water be separated by fractional distillation
Because of different boiling point
Explain why the first liquid to be collected in the beaker is mostly ethanol in fractional distillation
Because ethanol has a lower boiling point
Obtain pure water from sea water
Simple distillation
Obtain ethanol from a mixture of ethanol and water
Fractional distillation
Pure water from a solution
Simple distillation or fractional distillation
Soluble solid from solution
Crystillastion
Insoluble solid from liquid
Filtration
Liquid from mixture of liquids with different boiling points
Fractional distillation
Mixture of sand and water and want to obtain sand(insoluble)
Filtration
Method used to separate the dyes in food colouring
Chromatography
Explain why a is the least soluble
The spot closest to the start line travelled the least distance
Equation of rf
Distance moved by solvent÷distance from base line
Two students carry out separate chromatography experiments to find rf value for five different food dyes
State two things that should be the same in both experiments so the students can compare their results fairly
Same solvent
Same type of chromatography paper
Describe how a student could obtain chromatography
Draw start line in pencil
Use same food colourings
Food colouring in startline
Mark solvent front
Extract the red dye from a sample of rose petals
Dissolving
Water from copper (II) sulfate solution
Sime distillation
Method used to separate the solution of the green colouring from the remaining grass
Filtration
State why the solvent level should not be above the base line at the start of the experiment
To prevent leaching
Explain why people has largest no of dyes
Has largest nom of spots
Matter
Can be classified by its chemical constitution into element,compound or mixture
Element
Simplest form of matter that consists of similar atoms of the same type and can’t be divided into simpler substances by chemical methods
Compound
Is a substance that results from the combination of two or different elements by chemical bond in fixed ratio and its properties are different from the element forming it
Mixture
Composed of two or more substances which are mixed in different amounts by chemical bond in fixed ratio and its constituents can be separated by simple physical methods
Homogeneous
Where all of its substances are completely mixed
Heterogeneous
Where its substances are separated
What usage of float
It’s used to separate two solid of densities
Usage of melting and decanting in separation of mixture
It’s used to separate two solids of different melting point one of them of low melting point
Mixture of solid solid mixture
Dissolving,floating,by using magnet,melting and decanting,sublimation
Immiscibke liquid separated by what?
Oil and water
Separating funnel
Miscible liquids like alcohol water mixture and crude oil
Fractional distillation
Why use graphite in baseline
As its insoluble in any solvent
