Font size
Worksheetsis matter around us pure
Total questions: 17
Worksheet time: 9mins
brass is an alloy. It is a mixture of______
30% Zinc 70% copper
20% copper 80% nickel
40% iron 80% copper
35% gold 65% zinc
colloids can be seperated by
filtration
distillation
sedimentation
centrifugation
formula to find concentration of a solution?
(a)
how will you seperate sulphur and iron fillings
handpicking
sieving
crystallization
magnetic seperation
how will you seperate oxygen from a mixture of liquid air?
centrifugation
seperating funnel
fractional distillation
distillation
how will you seperate the components of sugar solution
evaporation
crystallization
filtration
chromatography
burning of candle is a
physical change
chemical change
both physical and chemical change
none of the above
a mixture of dye in a volatile liquid can be seperated by?
evaporatoion
sedimentation
chromatography
filtration
Tyndall effect is observed in forests because of
tress
high oxygen level
mist and dust particles in the air
less sunlight
concentration of 36g of NaCl in 100 g of water is
23%
26.47%
29.32%
21.11%
How would H2O be classified? Check all that apply.
Atom
Molecule
Compound
How would O2 be qualified. Check all answers that apply.
Atom
Molecule
Compound
What is an element?
A pure substance that cannot be broken down.
Two atoms bonded together.
Two or more different types of atoms bonded together.
An molecule with an unequal distribution of charge.
What are atoms composed of?
Protons and electrons.
Protons, neutrons, and electrons.
Neutrons and electrons.
Ions, elements, and compounds.
How many H atoms are in H2O?
1
2
