Water Revision Carousel Flashcards

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1
Q

What allows water molecules to have cohesive and adhesive properties?

A

Hydrogen bonds

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2
Q

Explain the polar nature of water.

A

-O is more electronegative than H/ unequal share of e- / e- spend more time orbiting around O than H
-Gives regions of slight positive and negative

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3
Q

Water molecules stick together because of the many hydrogen bonds that form between molecules of water. What is the name of this property of water?

A

Cohesion

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4
Q

Why is a stable water temperature (due to high specific heat capacity of water) good for cells?

A

Enzymes will denature if too hot and reactions will slow if too cold

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5
Q

Why is water adhesive?

A

Due to its polar nature meaning that it’s attracted to other substances, sticking to them

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6
Q

Why can water act as a medium for chemical reactions?

A

Because it’s polar and will dissolve polar molecules easily. Many reactants in living cells are polar in nature

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7
Q

Why is water cohesive?

A

The many hydrogen bonds between water molecule make them stick together

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8
Q

Why is ice less dense than liquid water?

A

Below 4 degrees the formation of hydrogen bonds will cause water to form a fixed lattice keeping the molecules further apart on average than they are in a liquids where hydrogen bonds are breaking and reforming as molecules move past each other

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9
Q

Why is ice floating a benefit for aquatic organisms?

A

-They are still able to move about under the ice as is their food.
-The layer of ice insulates the water below, keeping it liquid for longer

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10
Q

Why is water a good coolant?

A

-As it has a high specific heat capacity and can act as a heat sink.
-A lot of energy is transferred when water evaporates from a surface, cooling it

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11
Q

What kind of bonds are formed between H and O atoms in different water molecules?

A

Hydrogen bonds

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12
Q

Why does water have a higher boiling point than Carbon Dioxide?

A

The many hydrogen bonds between water molecule means that is takes a lot of energy to increase the temperature of water to become gaseous

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13
Q

What causes surface tension?

A

Water molecules are cohesive and are attracted to one another more strongly than they are to air

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14
Q

List the key properties of water that are valuable for living organisms.

A

-Good solvent
-High specific heat capacity
-High latent heat of vaporisation
-Less dense as ice
-Polar

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15
Q

Water molecules are attracted to other substances making them wet. What is the name of this property of water?

A

Adhesion

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16
Q

Why is the specific heat capacity of water so high?

A

The many hydrogen bonds between water molecules means that it takes a lot of energy to increase the temperature

17
Q

What is capillary action?

A

The tendency of water to move up a narrow tube against gravity due to the adhesion of water to the surfaces and the cohesion of water molecules to one another