Form 2 Chapter 5.1-5.2

Pure water has the following characteristics except

• colourless

• boiling point is 100 degree celcius

• odorless

• freezing point which is lower than 0 degree celcius

Which of the following is the attraction force between same molecule?

• Gravitiy force

• Buoyant force

• Adhesive force

• Cohesive force

Water molecule is made up of ....

• 1 hydrogen atom and 1 oxygen atom

• 1 hydrogen atom and 2 oxygen atoms

• 2 hydrogen atoms and 1 oxygen atom

• 2 hydroge atoms and 2 oxygen atoms

During water electrolysis, ___________ is discharged at the positive electrode (anode)?

• Oxygen

• Carbon dioxide

• Nitrogen

• Hydrogen

The presence of salt in water ________ the freezing point and ________ the boiling point of the water.

• increases, reduces

• increases, increases

• reduces, increases

• reduces, reduces

What is the name of process where liquid changes to gas on the surface of the water at any temperature?

• Boiling

• Melting

• Evaporation

• Sublimation

Which of the following factor can increase the rate of evaporation?

• High humidity

• Low surrounding temperature

• No air movement

• Larger exposed surface area

Which of the following is NOT the application of water evaporation in daily life?

• Hair dryer is used to dry wet hair

• The process of defecation

• Wet clothes are hung out widely open

• Seafood are dried under the sunshine

____________ are substances that can dissolve in liquids.

• Solutes

• Solution

• Solvent

• Mixture

Which of the following is TRUE about the saturated solution?

• Contains a little solute

• Contains the maximum amount of solute

• Can dissolve more solute

• Can dissolve a little solute