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WorksheetsF2 Chapter 5 Water and solution
Total questions: 23
Worksheet time: 20mins
Choose the physical characteristics of water. (You can choose more than one answer.)
Colourless
Odourless
Tasteless
Acidic
___________________ is an attractive force between the same type of molecules.
Cohesive force
Adhesive force
Friction force
Drag force
______________________ is an attractive force between different types of molecules.
Cohesive force
Adhesive force
Drag force
Thrust force
When we add salt into pure water, the boiling point of the solution will
be more than the boiling point of the pure water.
be less than the boiling point of the pure water.
same as the boiling point of the pure water.
Insects like daddy longlegs can move on the surface of the water because of
the higher density of water.
the special ability of floating.
the high surface tension of water.
During evaporation, water molecules on the surface of water ___________________ from surroundings to move faster and then escapes into the air
obtain energy
lose energy
share energy
produce energy
The higher humidity, the ________________________ the rate of evaporation of water
lower
higher
no change
changes
The correct application of water evaporation is everyday life are :
Using hair dryer to dry wet hair.
Fold the cloth half when hanging to dry.
Seafood like fish, squids and prawns are dried under the sun
Close the fan while we sweating
The rate evaporation of water increases when the :
surrounding temperature is decreases
air movement is faster
humidity is higher
exposed surface area is larger
The amount of solute that can be dissolved in a specific amount of solvent at a given temperature is its
concentration.
density.
dilution.
solubility.
Three 10 g samples of sugar are represented below.
Sample A dissolves in water more slowly than sample B.
Sample B dissolves more slowly than sample C.
Which of the following best explains why sample A dissolves more slowly than the other two?
It has the most volume.
It has the smallest surface area.
It has the largest number of sugar molecules.
It has the fewest bonds between sugar modules.
Students in Ms. Alvarez’s science class are investigating how temperature, in degrees Celsius (C), affects the solubility of a compound in 100 milliliters (mL) of water. Ms. Alvarez provides the students with a graph that shows the solubility of a certain compound, as shown below.
She then tell the students that she will demonstrate how many grams (g) of the compound will dissolve in 100 mL of water at 40 C. Based on the information in the graph, which of the following is the best prediction of how many grams of the compound will dissolve at 40 C?
40 g
65 g
85 g
100 g
What is the best way to purify water?
Add salt
Put inside the refrigerator
Filtration or Boiling
Find a very clean stream of water
What does chlorination do to the water?
kills microorganisms
Cleans the water
Makes the water taste nice
Removes twigs and sediment
Used to separate suspended particles from a liquid
Filtration
Distillation
Crystallisation
Evaporation
A Leibeg condenser is used in
filtration
evaporation
chromatography
distillation
methods of water purification are
Boiling, filtration, Chlorination and distillation
Boiling, filtration, evaporation and condensation
Boiling , filtration, condensation and distillation
Boiling, filtration, screening and chlorination
The first step in water treatment plant is
chlorination to kills microorganisms
fluoridation to prevents tooth decay
screening to removes large objects such as fish and twigs
aeration to removes unpleasant odour
what is added during coagulation process in water treatment plant
alum and slaked lime
florida
chlorine
calcium carbonate
The correct order of water purification in water treatment plant are:
filtration, coagulation, sedimentation, oxidation, chlorination and fluoridation
filtration,oxidation, coagulation, sedimentation, filtration, chlorination and fluoridation
Filtration, coagulation, sedimentation, filtration, chlorination and fluoridation
Filtration,oxidation, coagulation, sedimentation, chlorination and fluoridation
