Name:____________________________________
2.2 Properties of Water
Review
An atom is ______________________________________
Electrons are ____________________________________________
Protons are ____________________________________________
Neutrons are ____________________________________________
Protons and neutrons ____________________________________________
The molecule is the ____________________________________________
The # ___________________ = the # _______________________electrons
*NEW* There are ____________________________________________of bonds
Ionic Bond: ____________________________________________

There is a ____________________________________________ of electrons
Covalent: ____________________________________________

Electrons are ____________________________________________
Types of bonds
Sodium is a metal; when bonded with chlorine, it forms a __________________ bond
Hydrogen acts as a non metal when bonding with oxygen, another non metal. This type of bond is called a
_______________ bond
Potassium will form a __________ bond with chlorine
When oxygen bonds with itself, it forms a _________ bond
The Water Molecule
Water is a ____________________________________________
Finding liquid water on a planet tells scientists ________________________________________
What properties make water so important?
Water is a ____________________________________________ molecule
Water (H2O)is neutral, meaning there are 10 protons and 10 electrons
The oxygen atom has 8 protons; a hydrogen atom only has 1.
The electrons are pulled more towards the oxygen
Water is Polar
Because water is polar, ____________________________________________
This is due to ____________________________________________ bonds
So what does this mean?
Let‘s find out…
http://www.youtube.com/watch?v=9eaJ8u99A3c
http://www.youtube.com/watch?v=45yabrnryXk
http://www.youtube.com/watch?v=V-cXzZt2iVk
So what does this really look like?
http://www.youtube.com/watch?v=sBZfPmIcS-E
Other “neat” things about water
Cohesion- Because water can have as many as 4 hydrogen bonds, it is very cohesive.
____________________________________________
This is how lizards and water striders can walk on water
Adhesion- _________________________________________________________. Remember the meniscus
song?
Heat capacity- __________________________________________________________________.

Hydrogen bonds make it hard for water molecules to move faster
KEY
 2.2 Properties of Water
 Review
 An atom is the basic unit of matter
 Electrons are negatively charged and move around the nucleus
 Protons are positively charges
 Neutrons are neutral
 Protons and neutrons are located in the nucleus
 The molecule is the smallest unit of a compound.
 The # protons = the # electrons
 *NEW* There are two types of bonds
 Ionic Bond: Occurs between a metal and a nonmetal (+ and -)
 There is a transfer of electrons
 Covalent: Occurs between two non-metals
 Electrons are shared
 Types of bonds
 Sodium is a metal; when bonded with chlorine, it forms a __________________ bond
 Hydrogen acts as a non metal when bonding with oxygen, another non metal. This type of bond is called
a _______________ bond
 Potassium will form a __________ bond with chlorine
 When oxygen bonds with itself, it forms a _________ bond
 The Water Molecule
 Water is a compound found over most of earth’s surface
 Finding liquid water on a planet tells scientists that there could be life on that planet
 What properties make water so important?
 Water is a polar molecule
 Water (H2O)is neutral, meaning there are 10 protons and 10 electrons
 The oxygen atom has 8 protons; a hydrogen atom only has 1.
 The electrons are pulled more towards the oxygen
 Water is Polar
 Because water is polar, molecules are attracted to each other
 This is due to hydrogen bonds
 So what does this mean?
 Let‘s find out…
 http://www.youtube.com/watch?v=9eaJ8u99A3c
 http://www.youtube.com/watch?v=45yabrnryXk
 http://www.youtube.com/watch?v=V-cXzZt2iVk
 So what does this really look like?
 http://www.youtube.com/watch?v=sBZfPmIcS-E
 Other “neat” things about water
 Cohesion- Because water can have as many as 4 hydrogen bonds, it is very cohesive. Cohesion pulls
water molecules together
 This is how lizards and water striders can walk on water
 Adhesion- this causes water to pull up the sides of glasses and lab equipment. Remember the meniscus
song?
 Heat capacity- amount of heat energy required to increase a substance’s temperature.
 Hydrogen bonds make it hard for water molecules to move faster