Water (biological molecules)

Question 1

Structure of water

Answer 1

Strong covalent
solid- H bonds form a rigid ionic lattice
liquid- molecules have more kinetic energy-fleeting H bonds
gas- far a part, don’t interact

Question 2

SHC of water

Answer 2

lots of energy to break H bonds
less energy left to raise temp
High SHC

Question 3

Biological importance of High SHC

Answer 3

Constant internal body temp
large change in temp outside causes only small amount of change in body
stable environment for aquatic animals

Question 4

Solvent properties of water

Answer 4

Tiny charges of water attract ions
reactants spread- dissolving
separate- easy to react

Question 5

Biological importance of solvent properties

Answer 5

Easy to flow and carry substances- metabolic reactions are in solution
blood, phloem, urea, sieve plate

Question 6

Density of water

Answer 6

Water is more dense than ice

when melted the rigid hydrogen bonds in ice collapse and cause the water molecules to come together

Question 7

Biological importance of water’s density

Answer 7

Most living organisms have the same density are able to float

Question 8

Why is it hard to swim in water

Answer 8

Hard to cut through the large number of molecules that are attracted to each other
many sea animals are streamlined

Question 9

Cooling mechanism of the body

Answer 9

Liquid sweat absorbs heat energy of the body= latent heat of evaporations