3.1.7 Water Flashcards Preview

AQA A Level Biology > 3.1.7 Water > Flashcards

Flashcards in 3.1.7 Water Deck (5)
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1
Q

What is the structure and bonding of water?

A

Two atoms of hydrogen and one atom of oxygen
Dipolar molecule
Hydrogen = positive, oxygen = negative
Hydrogen bonding is the attractive force between molecules
Covalently bonded so don’t conduct electricity

2
Q

What are the properties of water which aid life? (No explanation)

A
Dipolar
Has hydrogen bonding
Covalently bonded
High boiling point due to hydrogen bonding
High specific heat capacity
High latent heat of vaporisation
Cohesion
Not easily compressed
Transparent
3
Q

How do the properties of water aid life?

A

High boiling point: buffer against sudden temperature changes
High latent heat of vaporisation: sweating provides an effective cooling effect
Cohesion: xylem can transport water
Not easily compressed: provides support for organisms
Transparent: light can reach aquatic plants

4
Q

How is water used in the metabolism?

A

Used to break down many complex molecules by hydrolysis
Chemical reactions take place in an aqueous medium
Water is a major raw material in photosynthesis

5
Q

How is water used as a solvent?

A

It readily dissolves some substances including: gases, wastes, inorganic ions, small hydrophilic molecules and enzymes

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