WorksheetsGrade 7
Total questions: 17
Worksheet time: 6mins
When salt is mixed into water it becomes
element
compound
mixture
solute
Alloys include
steel
brass
bronze
all of them
In clean air, percentage of oxygen is
0.07
0.1
0.15
0.17
Balloons are filled with
carbon dioxide
oxygen
helium
nitrogen
Constituents of an element can be separated through
experiment
physical processes
physical method
physical means
A process in which liquid changes into vapor or gas by boiling, is called
distillation
filtration
evaporation
fractional distillation
Air is a mixture of
elements
compounds
gases
molecules
The crystals of dry ice that keep things cold are a solid state of
carbon dioxide
oxygen
helium
nitrogen
Breakdown or formation of compound involves
chemical reaction
heating
passing electricity through
all of the above
A substance which is made by mixing two elements without being chemically combined is called a
solute
compound
mixture
solution
_________________ substances can dissolve in a liquid.
insoluble
soluble
miscible
immiscible
Pepper is an example of a substance that is __________________ in water.
soluble
insoluble
miscible
solution
When a soluble substances dissolves, it usually leaves behind a __________________ liquid and we cannot ___________________ it.
cloudy, see
clear, taste
clear, see
cloudy, taste
Which substances are insoluble in water? (choose TWO answers)
sand
sugar
salt
flour
Which substances are soluble in water? (choose TWO answers)
pepper
sugar
coffee
flour
Salt dissolves in water so it dissolves in all liquids.
True
False
_________________ substances cannot dissolve in a liquid.
soluble
insoluble
