Water & Solution

Which of the following are the physical characteristics of water?

• Boiling point = 100°C

• Freezing point = 100°C

• Density = 1 g cm^-3

• Colourless

Water has a high surface tension. Surface tension is a result of ______________ between the molecules of water at the surface that allows insects like daddy longlegs to stay afloat on the water.

• cohesive force

• repulsive force

• attractive force

• capillary action

Cohesive force between water molecules and adhesive force between water molecules and the cell walls of ___________allow water to be drawn up from the roots to the leaves of plants. This phenomenon is known as capillary action.

• phloem

• stem

• xylem

• tube

Water molecule is made of _______of hydrogen and ______ atom of oxygen.

• one, two

• two, three

• two, one

• three, one

 

Condensation is a process of changes in the state of matter from ______________

• solid to liquid

• gas to liquid

• liquid to gas

• gas to solid

Which of the following are the factors affecting rate of evaporation of water?

• Humidity

• Colour of the water

• Surrounding temperature

• Exposed surface area of water

• Movement of air

 

____________is a substance that can dissolve in a liquid

• solvent

• solution

• solute

___________ is a liquid that dissolves a substance

• solvent

• solution

• solute

 

__________ is the mixture formed when a solute

dissolves in a solvent.

• solvent

• solution

• solute

What happens when less amount of solute dissolves in a solvent?

• A dilute solution is formed

• A saturated solution is formed

• A concentrated solution is formed