Download Properties of Water * Day 2

Properties of Water –
Day 2
Kline
Biology
Universal Solvent
Water is referred to as the
universal solvent because it can
dissolve any polar substance
Think of some examples of things
that can dissolve in water!
Polar vs. Nonpolar
Polar molecules –
have a charge (Salt,
Sugar, Oxygen,
Carbon Dioxide)
Nonpolar molecules
– do not have a
charge (Oils, Fats,
Steroids, Wax,
Cholesterol)
Mix it up!
Solution – a mixture of substances that is
the same throughout
Homogenous – same throughout
Heterogeneous – can be separated
Solvent – the substance present in greater
volume (usually water)
Solute – the substance that dissolves (like
salt or sugar)
Universal Solvent Lab
 https://www.youtube.com/watch?v=BS1VeH8u1n4
pH
Acids – pH less than 7
Bases (alkaline) – pH greater than 7
Neutral – pH of 7
Can you identify these substances
based upon the pH?
States of Water
States of Water
Solid – water molecules are evenly spaced
apart making them less dense than water.
Liquid – water molecules are densely
compacted within a container
Gas – water vapor molecules are free flowing in
the atmosphere
Freezing Properties
 Ice is less dense than
water, therefore it floats
 Water is the only
substance that gets
bigger when it freezes.
 https://www.youtube.com/watch?v=
UukRgqzk-KE
How is this important to living things?
Ice over a pond or lake
Glaciers floating
Discuss how these examples are important
in terms of water’s freezing properties with
your partner.