Water - 3.2 (2) Flashcards

Page 45

1
Q

What kind of properties does water have?

A

cohesive properties

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2
Q

Why does water move as one mass?

A

because the molecules are attraced to each other (because of cohesion)

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3
Q

As it moves as one mass because the molecules are attracted to eachother, this is how plants are able to draw what up?

A

draw water up from their roots and how you are able to drink water through a straw

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4
Q

What other properties does water also have?

A

adhesive properties - this is where water molecules are attracted to other materials

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5
Q

For example, when you wash your hands, your hands become wet, and the water doesn’t run straight off. What are the water molecules more strongly cohesive to?

A

each other than they are to air -> this results in water having a ‘skin’ of surface tension

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6
Q

What are the characteristics and properties of water vital in?

A

sustaining life

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7
Q

Because water is a polar molecule, what does it act as?

A

a solvent in which many of the solutes (substances) in an organism can be dissolved

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8
Q

What is the cytosol of prokaryotes and eukaryotes?

A

mainly water

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9
Q

Many solutes (substances) are also what?

A

polar molecules, amino acids, proteins, and nucleic acids

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10
Q

What does water act as?

A

a medium for chemical reactions

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11
Q

What does water help to transport?

A

dissolved compounds into and out of cells

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12
Q

What does water make a very efficient transport medium for?

A

within living things

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13
Q

What does cohesion between water molecules mean?

A

when water is transported through the body, the molecules will stick together

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14
Q

Where does adhesion occur between?

A

water molecules and other polar molecules and surfaces

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15
Q

What does the effects on adhesion and cohesion result in?

A

water exhibiting capillary action

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16
Q

What is capillary action?

A

the process where water can rise up a narrow tube against the force of gravity

17
Q

What can water also act as?

18
Q

What does water acting as a coolant help to buffer?

A

temperature changes during chemical reactions in prokaryotic and eukaryotic cells bc of the large amounts of energy required to overcome hydrogen bonding

19
Q

Why is maintaining constant temperatures in cellular enviroments important?

A

as enzymes are often only active in a narrow temperature range

20
Q

What lives in water and cannot survive out of it?

A

many organisms such as fish

21
Q

How is water stable?

A

it does not change temperature or become a gas easily, so it provides a constant enviroment

22
Q

Because ice floats, what does it form?

A

it forms on the surface of ponds and lakes, rather than from the bottom up

23
Q

What does the ice that forms on the surface of ponds and lakes form?

A

an insulating layer above the water below

24
Q

What would aquatic organisms not be able to survive?

A

freezing temperatures if their enire habitat froze solid

25
What do some organisms also inhabit?
the surface of water
26
What is surface tension strong enough to support?
small insects such as pond skaters