Water Flashcards

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1
Q

A water molecules is ___

A

dipolar

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2
Q

What is a water molecule made up of?

A

2 hydrogen

1 oxygen

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3
Q

How can a water molecule be dipolar?

A

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

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4
Q

Name bond between water molecules

A

Hydrogen

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5
Q

Why is the specific heat capacity of water significant?

A

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

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6
Q

Describe the latent heat of vaporisation of water

A

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

very effective method of cooling

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7
Q

Water is where ______

A

life arose

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8
Q

Describe cohesion and surface tension in water

A

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

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9
Q

Define cohesion

A

tendency of alike molecules to stick together

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10
Q

Define adhesion

A

tendency on unalike molecule to stick together

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11
Q

Describe the role of water in Metabolism

A

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

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12
Q

Describe water as a solvent

A
water readily dissolves other substances
eg gas ( co2 o2)
waste ( NH3 urea )
inorganic ions / small hydrophobic molecules 
enzymes ( reaction in solution )
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13
Q

Random 3 features of water

A

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

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14
Q

Name the 8 important features of water

A
Specific heat capacity 
Latent heat of evaporation 
Cohesion and surface tension
metabolism
 solvent
 evaporation
 not easily compressed 
transparent
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15
Q

Where are inorganic ions found ?

A

in solution in the cytoplasm
body fluids
part of larger molecules

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16
Q

Name and example of organic ions and its function

A

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