Structures and properties of water Flashcards Preview

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Flashcards in Structures and properties of water Deck (17):
1

Chemical structure of water

Polar Covalent bond (hydrogen to oxygen)
Hydrogen bond (connect neighboring water molecules)

2

3 physical states of water

water vapor- gas- moves rapidly
water- liquid- moves slower
ice- solid- moves slowest

3

Change in energies to change phase

Need excess energy to vaporize or freeze
more than the 100 C to evaporate
less than 0 C to form ice

4

Latent heat of vaporization

the excess heat to evaporate

5

Latent heat of fusion

removal of heat to form ice

6

How do salt/substances change boiling point and freezing point

increase boiling point
decrease freezing point
-andy dissolved substance affects freezing and boiling point

7

How water moderates climate

-high latent heat of vaporization at equator
-greater precipitation at high latitudes
*removal of heat from low latitudes and release of this heat at high latitudes as water vapor condenses

8

How is water affected by temperature

slow to cool and to heat up
this helps to moderate temperature

9

How does water affect surface tension

high surface tension (cohesion between water molecules by hydrogen bonds)

10

What is the viscosity of water

high viscosity (flow)

11

How does comprssibility of water affect water animals

lacking air-filled cavities allow for animals to withstand more pressure

12

How do you make water more viscous

add more stuff

13

How does salt content and temp affect density

fresh water is less dense than salty
warm water is less dense than cold

14

Why is water being a universal solvent helpful

helps with dissolving substances and errosion

15

Describe lights movement through water

water is transparent and eventually/gradually absorbs light (200 m)
Absorbs UV light which protects animals

16

How does sound travel in water

travels slower in water but farther

17

how is sound important for marine/aquatic animals

bioacoustics
echolocation and communication