1. What Are Some of the Unique Properties of Water?

2. Water is a Polar Molecule
What does that mean?
1) A molecule in which opposite ends have
opposite electrical charges
This is due the unequal sharing of electrons between the hydrogen and oxygen atoms

3. Why is there unequal sharing of electrons in water molecules?
Because there is an uneven distribution of electrons between the oxygen and hydrogen atoms.
The nucleus of Oxygen has 8 protons which pulls the electrons further from the hydrogen nucleus which only has 1 proton

4. Is H2 a polar molecule?
No, because each of the hydrogen electrons are being pulled from an equal amount of protons.
H2 is an example of a Non-Polar Molecule

5. Water molecules attract each other in a specific way due to this unequal sharing
The slightly negative oxygen atom of one molecule attracts the slightly positive hydrogen atom of adjacent water molecules

6. This attraction between water molecules is called Hydrogen Bonding
(4) Hydrogen Bonding is responsible for water’s unique properties

7. Unique Property #1
The molecules of water in ice are less densely packed than those of liquid water
Therefore, ice floats in water

8. Unique Property #2
Cohesion- the tendency of molecules of the same kind to stick to one another
Adhesion- the attraction
between unlike molecules
Trees depend on these
properties of water to help
transport water from their
roots to their leaves

9. This is known as Transpiration
Water is able to move
against the force of
gravity
Water from the leaves
evaporates and water is
Pulled through the vessels in the tree from the roots

10. What is Surface Tension?
Cohesion pulls the molecules at the surface tightly together and a filmlike boundary is formed

11. H bonds make water more resistant to temperature change
Unique Property #3
Why does water take longer to heat up in the summer and longer to cool in the winter?
H bonds make water more resistant to temperature change

12. Unique Property #4 Water has a great ability to dissolve other
substances

13. **When water is the solvent, the result is called an Aqueous solution
What is a solution?
Solution- is a uniform
mixture of two or more
substances
Solvent- the substance that dissolves the other substance
Solute- the substance that is dissolved
**When water is the solvent, the result is called an Aqueous solution