Water Flashcards

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1
Q

Water

A
  • most important biochemical
  • major component of all cells
  • provides an environment for water organisms
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2
Q

Ice is less…

A

Dense than water

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3
Q

Water has quite high…

A

Boiling point compared to most of the chemicals

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4
Q

H2O molecules are connected by…

A

Hydrogen bond, which is quite weak

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5
Q

Too many hydrogen bonds make the substance…

A

Very strong

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6
Q

Hydrogen bond

A

Between hydrogen attached to an electronegative atom of one molecule and electronegative atom of another

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7
Q

Water has:

A
  • high boiling point
    -high specific heat capacity
    -high surface tension
    -high latent heat of vaporisation
    All thanks to hydrogen bonds
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8
Q

Why is water a good solvent?

A

Because it’s polarity-slightly charged

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9
Q

Polar water

A

Partially negative dipoles of the water are attracted to positively charged components of the solute and vice versa

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10
Q

Water transports cells in…

A

Blood, lymphatic excretory and digestive systems of animals.

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11
Q

Thermal properties of water

A
  • hydrogen bonding restricts the movement

- a lot of energy is needed to rise the temperature

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12
Q

Water’s thermal properties result in…

A

Slow environmental change =more stable habitats

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13
Q

Below 4 degrees the density of water

A

Decreases

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14
Q

Ice floats on water and…

A

Insulates water under.

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15
Q

Changes in density of water with…

A

Temperature cause currents, which maintains a circulation of nutrients in ocean

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16
Q

Water molecules have very high c…

A

Cohesion

17
Q

Water molecules tend to…

A

Stick together

18
Q

High cohesion results in high surface…

A

Tension at the surface of water (important for small organisms)

19
Q

Water is used as a reagent in…

A

Photosynthesis. Hydrogen is used to provide energy for making glucose.