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WorksheetsScience F2 Chapter 5: Water & Solution (2M1)
Total questions: 20
Worksheet time: 40mins
One molecule of water consists of
1 oxygen atom and 1 hydrogen atom
2 oxygen atom and 1 hydrogen atom
2 oxygen atom and 1 nitrogen atom
1 oxygen atom and 2 hydrogen atom
The diagram shows water molecules travelling up the xylem vessels of the plant. Label the forces.
i) Adhesive force
ii) Cohesive force
i) Cohesive force
ii) Adhesive force
What gas is released (被释放) in the test tube P?
Oxygen
Hydrogen
Nitrogen
Carbon dioxide
Mark for the correct statement about the gas released in test tube Q.
produces a 'pop' sound with a glowing wooden splinter
produces a 'pop' sound with a burning wooden splinter
lights up a glowing wooden splinter
In the electrolysis of water, if the volume of oxygen collected is 10cm3, predict (预测) the volume of hydrogen collected?
5cm3
10cm3
15cm3
20cm3
The presence (存在) of salt can either __________ the boiling point of water or ____________ melting point of ice.
increase , decrease
decrease , increase
increase . increase
decrease , decrease
Which statements are true about evaporation?
Process which water vapour (gas) changes to water (liquid)
A fast process (过程)
Occurs (发生在) at any temperature (任何温度)
Takes place at water surface (水的表面) only
Which of the statements below are true about the rate of (蒸发效率)?
The higher the humidity, the higher the rate of evaporation.
The higher the surrounding temperature, the higher the rate of evaporation.
The faster the movement of air, the lower the rate of evaporation.
The bigger the exposed surface area, the higher the rate of evaporation.
During winter, the truck will spread salt on the icy road. Why do they do so?
Salt is used to melt the ice on the road
Salt increase the melting point of ice
Salt decreases the melting point of ice
Salt makes the road tastier :b
Which of following is the correct statement about solution and suspension?
Solution is clear, while suspension is cloudy
Solution contains undissolved substances, while suspension contains dissolved substances
Light cannot penetrate (透过) solution, while light can penetrate (透过) suspension
Which of the following usually makes a substance dissolve (溶解) faster in a solvent?
Stirring
Increasing the temperature
Using smaller solutes
All the other answers are correct
A __________ solution CANNOT dissolve anymore solute.
supersaturated
saturated
concentrated
dilute
______________ eliminates (消除) suspended particles in water.
Chlorination
Filtration
Oxidation
Fluoridation
A powder is about to be poured into the liquid. Which of the following should be done to make this powder dissolve (溶解) faster?
stir the powder in the liquid
set the liquid at lower temperature
replace the powder with same material but in cubes
store the mixture in a dark place
What does chlorination do to the water?
Kills microorganisms (微生物)
Remove dissolved (被溶解的) substances
Makes the water taste good
Removes sand and dust
Which of the following methods of water purification (水净化) can eliminate (消除) odour (异味)?
Boiling
Distillation
Chlorination
Sedimentation
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
Oxidation to removes unpleasant odour
What is added during coagulation process in water treatment plant?
alum and slaked lime
sodium floride
chlorine
calcium carbonate
What is the purpose (作用) of adding slaked lime during water treatment?
To reduce the acidity (酸性) of water
To cause mud particles to stick together
To filter (过滤) large suspended particles
To prevent tooth decay (蛀牙)
What is the purpose (作用) of adding fluoride during water treatment?
To reduce the acidity (酸性) of water
To cause mud particles to stick together
To filter (过滤) large suspended particles
To prevent tooth decay (蛀牙)
