2.2 biological molecules

Question 1

Describe the structure of water

Answer 1

• covalently bonded Hydroegna nd water
• oxygen has a greater share of electrons so is slightly negative
• hydrogen is slightly positive
• seperation in charge is due to electron in covalent bonds being unevenly shared
• hydrogen bond form between other water molecules due to positive and negative regions of molecules attarcting each other
• hydorgen bond are weak therefore they constantly break and reform constantly moving the molecules

Question 2

list the properties of water

Answer 2

• excellent solvent
• good transport medium
• has a high boiling point/ shc
• has a high latent heat of vaporisation
• is a good raegant
• water as a solid is less dense than when liquid
• cohesive
• adhesive

Question 3

explain how water is a good solvent

Answer 3

substances such as ions or covalently bonded molecules are attracted to the polar water molecules therefore allowing for them to dissolve therefore making it a good transport medium

Question 4

explain how water has a high shc

Answer 4

• high boiling point so is a liquid at room temperature due ot the bydrogen bonding of molecules
• takes a lot of energy to increase temeperature of water and cause it to become gaseous

Question 5

explain how water has a high latent heat

Question 6

explain how water is less dense when a solid

Question 7

explain how water is cohesive

Question 8

explain how water has adhesive