Date: October 16, 2015Aim #16: What are some of the unique properties of water?

HW:1)Worksheet- Properties of Water DUE

TUESDAY2)Guided Reading 2-2 DUE THURSDAY3)Quiz (Inorganic Chemistry)- Wednesday

10/21 & Thursday 10/22 (day of double period)

Do Now: Warm-Up Notebook

Date Title of Activity Page #10/16 Chemical Bonding

31

Aim #16: What are some of the unique properties of water?

Water is a Polar MoleculeWhat does that mean?

A molecule in which opposite ends have opposite electrical charges

This is due the unequal sharing of electrons betweenthe hydrogen and oxygen atoms

Why is there unequal sharing of electrons in water molecules?

The nucleus of Oxygen has 8 protons which pullsthe electrons farther from the hydrogen nucleuswhich only has 1 proton

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

Water molecules attract each other in a specific way due to this

unequal sharing

The slightly negative oxygen atom of one moleculeattracts the slightly positive hydrogen atom of adjacent water molecules

This attraction between water molecules is called Hydrogen

Bonding

Hydrogen Bonding is responsible for water’sunique properties

Unique Property #1

The molecules of water in ice are less densely packed than those of liquid water

Therefore, ice floats in water

Unique Property #2

Cohesion- the tendency ofmolecules of the same kindto stick to one another

Adhesion- the attraction between unlike molecules

Trees depend on theseproperties of water to helptransport water from theirroots to their leaves

This is known as Transpiration

Water is able to move against the force ofgravity

Water from the leavesevaporate and water is Pulled through the vesselsIn the tree from the roots

What is Surface Tension?

Cohesion pulls the molecules at the surface tightlytogether and a filmlike boundary is formed

Unique Property #3Why does water take longer to heat up in the summer and longer to cool in the winter?

H bonds make water more resistant to temperaturechange

Unique Property #4

Water has a great abilityto dissolve other substances

What is a solution?

Solution- is a uniform mixture of two or more substances

Solvent- the substance that dissolvesthe other substance

Solute- the substance that is dissolved

**When water is the solvent, the result is called anAqueous solution