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WorksheetsIs matter in our surroundings pure
Total questions: 35
Worksheet time: 20mins
A pure substance is made up of:
Different types of particles
Only one type of particles
Two or more compounds
Mixtures
Air is an example of:
Compound
Element
Mixture
Pure substance
Which of the following is a homogeneous mixture?
Soil
Lemonade
Smoke
Sand and salt
Which of the following is a heterogeneous mixture?
Sugar solution
Brass
Sand in water
Air
Milk is a/an:
Element
Compound
Colloid
Suspension
Which of the following is a compound?
Air
Water
Brass
Soil
Which separation method is used to separate salt from sea water?
Filtration
Evaporation
Sedimentation
Sublimation
The process used to separate two miscible liquids having different boiling points is:
Filtration
Distillation
Evaporation
Sublimation
Which technique is used to separate coloured components of a mixture?
Chromatography
Evaporation
Filtration
Crystallization
Brass is an alloy of:
Copper and Zinc
Copper and Tin
Iron and Carbon
Zinc and Lead
An element can be broken down into simpler substances.
True
False
Mixtures have fixed melting and boiling points.
True
False
Air is a homogeneous mixture.
True
False
Colloids scatter a beam of light.
True
False
A solution is always transparent.
True
False
The scattering of light by colloids is called (a) .
Soil and sand is an example of (a) mixture.
A substance composed of two or more elements chemically combined in a fixed proportion is called a (a) .
The particles in a suspension are ______.
The solvent in lemonade is (a) .
Why is air considered a mixture?
Because its components are chemically combined
Because its components are physically mixed
Because it has fixed composition
None
Why do alloys not show properties of pure metals?
Because they are elements
Because they are mixtures of metals
Because they are compounds
None
Which separation method is used to separate camphor from salt?
Filtration
Sublimation
Evaporation
Distillation
Why is brass a homogeneous mixture?
Because metals are soluble in one another
Because zinc is invisible
Because copper is solid
None
Which method can be used to obtain pure crystals of copper sulphate from its solution?
Distillation
Evaporation
Crystallization
Filtration
Mixtures can be separated by:
Physical methods
Chemical methods only
Nuclear reactions
None
Which of the following is not a colloid?
Milk
Fog
Salt solution
Smoke
Which one has fixed composition?
Mixture
Compound
Air
Soil
Which property of colloids makes sky appear blue?
Sedimentation
Tyndall effect
Crystallization
Evaporation
Ink is separated into its components by:
Filtration
Chromatography
Distillation
Evaporation
Sea water is a:
Pure substance
Mixture
Compound
Element
In a true solution, the particle size is:
More than 1 nm
Less than 1 nm
More than 100 nm
Visible
Colloids are:
Stable
Unstable
Separated easily by filtration
Pure substances
Example of a suspension is:
Milk
Muddy water
Salt solution
Brass
Which one shows Tyndall effect?
True solution
Colloid
Suspension only
Pure substance
