
ELEMENTS, COMPOUNDS AND MIXTURES [dchemlc]
Authored by Miyuni Thisanga De Almeida
Chemistry
9th Grade
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10 questions
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1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
which of the following is not an element?
water
oxygen gas
diamond
magnesium
Answer explanation
Elements are substances that can't be split into anything simpler by chemical means. An element contains only one type of atom.
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
which of the following is not a compound?
air
methane
sodium chloride
carbon dioxide
Answer explanation
Compounds are formed when two or more elements chemically combine. The elements always combine in fixed proportions.
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
an impure sample of aspirin would have a
higher boiling point
lower boiling point
fixed boiling point
no boiling point
Answer explanation
The presence of impurities lowers the melting point of a substance and raises the boiling point.
4.
FILL IN THE BLANK QUESTION
30 sec • 1 pt
Filtration can be used to separate a solid from a liquid. What do you call the liquid that is filtered through?
Answer explanation
The substance left in the filter paper is called the residue and the liquid that comes through is called the filtrate.
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
which method of seperation would you use to separate a mixture of sand and water?
filtration
crystallisation
distillation
centrifuging
Answer explanation
sand can be separated from water by filtration.
6.
MULTIPLE SELECT QUESTION
45 sec • 1 pt
which two methods can be used to obtain salt from rock salt?
filtration
crystallisation
distillation
centrifuging
chromatography
Answer explanation
We can use filtration and crystallisation to obtain pure salt from rock salt.
If you crush the rock salt and mix it with hot water, the salt dissolves, but the impurities don't. The impurities can be filtered off, and remain on the filter paper. The filtrate is then a salt solution. The solid salt can be obtained from the solution by crystallisation.
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
copper sulphate is soluble in water. Which method would you use to obtain copper sulphate from water?
crystallisation
centrifuging
chromatography
filtration
Answer explanation
Crystallisation can be used to separate a solute from a solution.
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