2.1 Properties of Water Quiz

Question 1

main parameters to measure for water

Answer 1

temperature
salinity
pH
light/visibility/turbidity
oxygen concentration

Question 2

two hydrogens and one oxygen form a ___ bond

Answer 2

covalent

Question 3

water molecules bond by ___ bonds

Answer 3

hydrogen

Question 4

which of water’s properties makes it sticky

Answer 4

cohesion

Question 5

Fresh water freezes at __ and boils at __

Answer 5

0C, 100C

Question 6

SaltWater freezes at __, and boils at __

Answer 6

-2C, 103C

Question 7

salinity is the measure of

Answer 7

how much mass of salt(g) is in a volume(one liter) of water
ppt-parts per thousand

Question 8

salinity of sea water

Answer 8

3-3.5%(30-35ppt)

Question 9

solubility

Answer 9

the ability of a substance to be dissolved

Question 10

Why is salt easily dissolved in water

Answer 10

NaCl bonds are ionic, while H2O bonds are covalent(stronger), salt breaks into ions

Question 11

positive ions in the water come from

Answer 11

rock and soil erosion

Question 12

negative ions in the water come from

Answer 12

magma(volcanoes/rain)

Question 12

Two ways to measure salinity

Answer 12

gravimetrically- boil liter of salty water, and measure salt remnants
Light refraction refractometer

Question 13

are ocean salt concentrations the same all around the world?

Answer 13

no

Question 13

pH Scale

Answer 13

measures amount of free H+ in a solution

Question 13

What is 0-7 on the pH scale

Answer 13

acid

Question 13

what is 8-14 on the pH scale

Answer 13

base

Question 13

what is a 7 on the pH scale

Answer 13

neutral(water)

Question 13

What results in oceans absorbing CO2

Answer 13

the formation of carbonic acid, long term ocean acidification

Question 13

Why does Ocean pH matter?

Answer 13

-enzymes and chemical reactions for metabolism in organisms require a narrow pH range
-pH affects dissolvability and transport of gases and ions across membranes
-biological structures like bone shells also affected by pH

Question 13

How much CO2 do oceans absorb

Answer 13

25% of all emissions

Question 13

turbidity of water

Answer 13

clearness, clarity of water

Question 13

Why are acidic oceans a problem

Answer 13

acidic water dissolves shells, affecting shellfish, as well as affects behavior and senses of fish, and weakens coral reefs.

these and related problems affect the food chain and eventually humans

Question 14

when light hits water

Answer 14

most is reflected, some is absorbed, and some transmitted

Question 14

secchi disk

Answer 14

tool showing how deep water allows its black and white pattern to be discerned

Question 14

dissolved oxygen in water is

Answer 14

the presence of free O2 molecules within water

Question 14

hotter water contains ___ O2, while colder water contains __ O2

Answer 14

less, more

Question 14

Pressure increases in seawater one atmosphere every __

Answer 14

ten meters(33ft)

Question 14

Boyle’s Law

Answer 14

when pressure on a gas increases, its volume decreases