2.2 Biological Molecules (WATER)

Question 1

Why is water polar?

Answer 1

Due to uneven distribution of charge
(Oxygen is partially negative while Hydrogen is partially positive)
- Called Hydrogen bonding

Question 2

What bonds are in water?

Answer 2

Hydrogen bonds

Question 3

What gives water high SHC?

Answer 3

Hydrogen bonds
- This is because they can absorb a lot of energy, the higher the energy needed to raise the temp the higher the SHC.

Question 4

What does water not experience rapid temperature changes?

Answer 4

It has a high SHC

Question 5

What makes water cohesive?

Answer 5

Polarity

Question 6

What is cohesion?

Answer 6

Attraction between molecules of the same type

Question 7

What does cohesion mean for water?

Answer 7

This helps them flow, makes it great transporting substances. Helps water transport up plant stems.

Question 8

What does polarity mean for water?

Answer 8

High cohesion and makes it a good solvent

Question 9

What makes water a good solvent?

Answer 9

Polarity

Question 10

What does being a good solvent mean for water?

Answer 10

Makes it useful in living organisms , blood can be transported in the blood

Question 11

Ice is less dense than water which means?

Answer 11

Ice floats on top of water
This provides an insulating layer, increases the chance of survival of organisms in water
This is because it prevents them from freezing

Question 12

Water is key in which reactions?

Answer 12

Condensation and Hydrolysis