3.1.7 Water Flashcards
(18 cards)
Is water polar or non-polar?
Water is polar
This is due to difference in electronegativities of the two elements its made of
How does Hydrogen Bonding occur in water?
H-Bonds are weak forces that occur between the δ+ hydrogen and δ- oxygen between another molecule.
How is water a metabolite?
Water is involved in many metabolic reactions such as photosynthesis, hydrolysis and condensation reaction.
Where is water used as a metabolite?
90% of the plasma in the blood and the cytoplasm is composed of water and that is where these reactions occur
What is a solvent?
Substance that dissolve in water easily
How is water a solvent?
Due to its polarity, the δ+ H will attract any negatively charged particles and δ- O will attract any positively charged particles
Does lipids dissolve in water?
Lipids are non-polar and so it won’t dissolve in water
Where is water a solvent?
In the transportation of minerals and nutrients around plants and animals through the xylem and the phloem
What is Specific Heat Capacity?
The amount of energy that is required to raise the temperature of the water by 1ºC
Why is a High SHC important for water?
The temperature of the water remains relatively stable, even if the surrounding temperature fluctuates significantly. So temperature inside of plants and animals should remain relatively constant
Where is water High SHC property important?
Enzymes do not denature or reduce activity with temperature fluctuations which provides a stable environement for organisms
What does a large Latent Heat of vapourisation suggest?
The amount of energy that is required to convert water from its liquid state to a gaseous state
Why does water have a large Latent Heat of Vapourisation?
Lots of energy is required to break the hydrogen bonds between water molecules
Why is water’s High Latent Heat of Vapourisation imprtantr?
Provides a significant cooling effect to organisms. This occurs when humans sweat, they release water and heat from the skin is transferred to the water and it evapourates
What is cohesion?
Cohesion is the term used to describe water molecules ‘sticking’ together by hydrogen bonds
Does water have stong or weak cohesion?
Strong Cohesion
What does cohesion provide?
Cohesion provides surface tension to water enabling small invertebrates to move and live on the surface
Why is cohesion important?
Allows for mater molecules to stick together and therefore move up xylem during transpiration.
