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WorksheetsMastery Practice - Separation techniques
Total questions: 20
Worksheet time: 32mins
We can use a sieve to separate a mixture of _________________.
red buttons and blue buttons
sand and pebbles
oil and water
copper nails and iron particles
Sublimation occurs when _____________________.
a solid turns directly into a gas without becoming a liquid first
a gas turns directly into a solid without first becoming a liquid
a solid becomes a liquid
a gas becomes a liquid
Which of the following metals is non-magnetic?
iron
nickel
cobalt
silver
Which of the following undergoes sublimation?
sugar
water
iodine
sand
An alloy is not formed by mixing ____________________.
a metal with a non-metal
two different metals
two different non-metals
a metal with two non-metals
Jack wants to separate a mixture of candies as sown in the picture. The most suitable method to separate the candies by color is ____________.
sublimation
evaporation
picking them by hand
precipitation
A common chemical used to precipitate contaminants in water is ____________________.
alum
colloid
aluminium
bleach
Which of the following statements about evaporation is true?
Evaporation happens faster at higher temperatures.
Evaporation happens slower at higher temperatures.
Evaporation is not affected by temperature.
Evaporation happens only hwen the liquid is boiling.
Red ruby. Janet has a bowl of red rubbies in coconut milk. She wants only the red rubbies in the dessert. Which method can she use?
pour the dessert through a sieve
pour out the coconut milk
carry out filtration
all of the above
The steps of a water purification process are shown below. which step involves the precipitation technique?
Solid particles in the water clump together after alum is added.
Solid particles in the water settle to the bottom of the tank and are removed.
Water is passed through layers of filters.
All of the above.
Jack wants to dissolve a sugar cube in water. What can he do to make the sugar dissolve faster? ( Choose 2 correct answers)
stir the mixture
add ice to the mixture
heat the mixture
cool the mixture
Janet accidentally dropped some iron nails in a bag of coffee powder. What can Janet do to remove the iron nails from the bag of coffee powder? (Choose 2 correct answers)
add alum in the bag of coffee powder
place a magnet above the bag of coffee powder
add water to completely dissolve the coffee powder in the mixture and then carry out filtration
add water to completely dissolve the coffee powder in the mixture and then allow the water to evaporate
Jack has a bottle filled with oil, water, gravel and steel paperclips.
a. What can he do to separate the solids from the liquids?
Jack has a bottle filled with oil, water, gravel and steel paperclips.
b. What can he do to separate oil and water?
Jack has a bottle filled with oil, water, gravel and steel paperclips.
c. What can he do to separate the steel paperclips from the gravel?
Jack wants to separate a mixture of noodles and water. Which separation method should he use?
picking out by hand
sifting
sublimation
using a magnet
Which is the most suitable way to separate a mixture of flour, rice and iron powder?
using magnet >> sifting
using magnet >> precipitation
evaporation >> sifting
sifting >> picking by hand
Which of the following is the most suitable method to purify a large tank of dirty water?
sublimation
evaporation
picking by hand
precipitation
Sifting is a method used to separate _____________ of different sizes.
water
gases
liquids
solids
Which of the following mixtures can be best separated by handpicking?
sand and flour
salt and pepper
nuts and raisins
water and tea leaves
