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Worksheetsscience form 2 chapter 5 and 6
Total questions: 25
Worksheet time: 19mins
More than _______________ of Earth's surface is covered with water.
60%
70%
65%
80%
Water is a ____________________________ .
mixture
atom
compound
solid
Water molecule is made of ___________ of hydrogen and __________________ atom of oxygen.
one , two
three , two
two , one
two , two
Sublimation is a process of changes in the state of matter from ___________________________________________
gas to solid
solid to liquid
liquid to gas
gas to liquid
These two processes absorbs heat energy during the changes in the state of matter.
freezing and evaporation
evaporation and condensation
boiling and melting
freezing and condensation
During electrolysis the ___________________ gas is produced at the anode
oxygen
hydrogen
The impurities such salt when added to water will _______________ the freezing point of water.
increase
remain the same
decrease
The impurities such as sugar or salt will _____________________________________ the boiling point of the water.
increase
remain the same
decrease
Evaporation only occurs on the ___________________ of water
bottom
surface
boiling point
One of the characteristic below does not affect the rate of evaporation :
humidity
colour of the water
total surface area of the water
surrounding temperature
movement of air speed
Diagram shows a UHT milk. It is example of ...
Suspension
Solute
Colloids
Why fine salt dissolves faster bin water compared to coarse salt?
Fine salt has bigger total surface area exposed to water
Fine salt has smaller total surgace arra exposed to water
