Water

Question 1

A water molecules is ___

Answer 1

dipolar

Question 2

What is a water molecule made up of?

Answer 2

2 hydrogen

1 oxygen

Question 3

How can a water molecule be dipolar?

Answer 3

No overall charge
yet O = slightly - H= slightly +
it has both positive and negative poles
so it is dipolar

Question 4

Name bond between water molecules

Answer 4

Hydrogen

Question 5

Why is the specific heat capacity of water significant?

Answer 5

water molecules stick together which is unusual -> more energy needed, SHC higher than expected
SO
waters acts as a buffer against sudden temperature changes = temperature stable aquatic environment

Question 6

Describe the latent heat of vaporisation of water

Answer 6

H-bond = a lot of energy needed to evaporate 1kg of a water

very effective method of cooling

Question 7

Water is where ______

Answer 7

life arose

Question 8

Describe cohesion and surface tension in water

Answer 8

water surface = skin and strong enough to support small organisms
Large cohesive forces= pulled through tube
in contact with air water molecule is pulled back into body of water not escaping

Question 9

Define cohesion

Answer 9

tendency of alike molecules to stick together

Question 10

Define adhesion

Answer 10

tendency on unalike molecule to stick together

Question 11

Describe the role of water in Metabolism

Answer 11

water is used up in Hydrolysis / produced in condensation
chemical reaction occur in aq mediums
major raw material in photosythesis

Question 12

Describe water as a solvent

Answer 12

water readily dissolves other substances
eg gas ( co2 o2)
waste ( NH3 urea )
inorganic ions / small hydrophobic molecules 
enzymes ( reaction in solution )

Question 13

Random 3 features of water

Answer 13

evaporation cools organism so they can control their temperature
not easily compressed provides support eg hydrostatic skeleton
transparent aquatic plants can photosynthesize

Question 14

Name the 8 important features of water

Answer 14

Specific heat capacity 
Latent heat of evaporation 
Cohesion and surface tension
metabolism
 solvent
 evaporation
 not easily compressed 
transparent

Question 15

Where are inorganic ions found ?

Answer 15

in solution in the cytoplasm
body fluids
part of larger molecules

Question 16

Name and example of organic ions and its function

Answer 16

iron ion in haemoglobin, role in the transport of o2
phosphate ion , structure in DNA , storing energy in ATP molecules
Hydrogen ion, pH and functioning of enzymes