3.2 Water

Question 1

state of water at room temperature

Answer 1

liquid due to hydrogen bonds

Question 2

what is cohesion

Answer 2

molecules are attracted to each other so move as one mass

Question 3

what is adhesion

Answer 3

water molecules are attracted to other molecules

results in capillary action (rise up narrow tube against the force of gravity)

Question 4

ways which water is vital for life (4)

Answer 4

1. acts as a solvent
2. efficient transport medium
3. acts as a coolant
4. stable so forms insulating layer above water and has strong surface tension

Question 5

characteristics of water (6)

Answer 5

• high boiling point
• ice is less dense than water (hydrogen bonds fix positions slightly further apart)
• polar
• cohesive
• adhesive
• surface tension

Question 6

why does water have surface tension

Answer 6

water molecules are more strongly cohesive to each other than the air