Effect of Impurities on Water

Which following are examples of impurities in water?

• Hydrogen

• Salt

• Sugar

• Oxygen

Impurities of water like salt will have effect on _________________ of water

• melting point

• chemical formula

• density

• boiling point

• number of atom

Presence of salt in water will _______________ melting point of water

• increase

• decrease

• maintain

• change

Presence of salt in water will make ice takes _______________ time to melt.

• shorter

• longer

• no change

Presence of salt in water will ___________________ the boiling point water.

• decrease

• increase

• no change

Presence of impurities in water like sugar will make water takes ________________ time to boil.

• longer

• shorter

• no change

Presence of salt will have effect on _______________ the density of water.

• lower

• higher

• no change

Sea water has ______________________ density than fresh water because its contain impurities.

• higher

• lower

• same

Give the reasons why fisherman put salt on ice to keep the fish fresh longer.

• lower the melting point

• ice takes longer time to melt

• increase the density of ice

• increase the freezing point of water

Which of the following substance have higher density?

• Ice

• Salt solution

• Distilled water

• Tap water