Water (biological molecules) Flashcards

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1
Q

Structure of water

A

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

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2
Q

SHC of water

A

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

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3
Q

Biological importance of High SHC

A

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

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4
Q

Solvent properties of water

A

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

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5
Q

Biological importance of solvent properties

A

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

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6
Q

Density of water

A

Water is more dense than ice

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

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7
Q

Biological importance of water’s density

A

Most living organisms have the same density are able to float

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8
Q

Why is it hard to swim in water

A

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

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9
Q

Cooling mechanism of the body

A

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

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