FIM Water (4)

Properties of water

strong intermolecular interactions

high boiling point

density anomaly

high melting enthalpy

highest heat capacity of all liquids

highest specific evaporation enthalpy of all liquids

second largest surface tension of all liquids

very low heat conductivity

How does density of water change with temperature?

decreases from -5 to 0 degrees

increases rapidly and reaches a maximum at 4 degrees

slowly decreases afterwards

Water cycle

water from the atmosphere precipitates as ice, in rivers and lakes and ground water draining into the oceans from where it evaporates into the atmosphere again

How can the purity of water be assessed?

pH value

hardness

ion content

isotopic composition

bacteria content

dissolved gasses

pesticide content

carbon content

oxygen demand

How can sweet water be treated?

mechanical precleaning

breakdown clorination, ozonisation

flocculation

sedimentation

filtration

active carbon treatment

pH adjustment

Describe breakdown chlorination