1. Unit 5 Test = ___%

2. I studied by …

3. Goal for next time = ___% if you made your goal must

improve by 1

4. Next time I will study by…

Day 4 4-1

1. Draw the Lewis dot structure for berryllium bonded to fluorine.

Day 2 4-9

2. Ionic bonds most commonly form between???

3. Where would you find elements that form cations on the periodic table?

How do elements combine to form compounds?

Covalent bonds - Chemical bonds that result from the sharing of electron pairs between two atoms

What is the difference between ionic and covalent bonds?

Ionic bonding

the result of electrical attraction

Unequal charge distribution

covalent bonding

based on sharing of electrons

Equal charge distribution

Ionic Ionic

Covalent Molecular

Bonds Compounds

Bonds Compounds

Ionic Network (Crystal)

Individual molecules

+ -

-

-

+

-

-

+

+

H-O-H O=C=O

Ionic CompoundsMost are solids at room temperature

Stronger bonds

Hard, crystalline, and brittle

Higher melting and boiling points

Dissolve in water

Good conductors (liquid state) – electrolytes

Higher electronegative differences

Covalent CompoundsWeak interparticle forces

Many are liquids or gases (H2O, CO2)

Low melting / boiling points

Not good conductors

Molecule – group of atoms united by covalent bonds (molecules = molecular substance)

FORMULAS

Ionic - Empirical = ratio Molecular - How many atoms in a

single molecule (not always a simplified ratio, sugar = C6H12O6)

FORMULAS

Ionic - Empirical = ratio Molecular - How many atoms in a

single molecule (not always a simplified ratio, sugar = C6H12O6)

Structural - Specifies which atoms are bonded to each other (take o. chem)

Molecular Element – molecule of atoms of same element – NOT a compound -like O2, Cl2, O3

Due tomorrow!!!

1.How are covalent and ionic compounds different?

2. Where would you find elements that form anions on the periodic table?

Day 4 4-10

Revisiting Lewis structures:

Do individual structures first

As a general rule of thumb – most electroneg. Element goes in the middle (trial and error)

Multiple Bonds

F2 O2 N2

CH4 C2H6 C2H4 CO2

In a thunder storm you are safe in the car because the rubber tires will NOT conduct electricity. What type of substance do you think rubber is?

What type of bond: Cl—Cl ?

Chapter Quiz will be on Thursday 4-16!!!

Due NOW!!!

Day 4 4-13SirWalter,

Nate’s girl does not belong to Nate

but she would like to be your prom date

???

SirWalter Melendez will you go to the prom with Eunice Appiah?

1. Lewis Dot structure for CO2.

Day 4 4-13

2. In an ionic bond electrons are ____, but in covalent bonds electrons are ____.

1. The bond formed between K and F would be _______ because …

2. ______ compounds break apart into ______ when dissolved in water and conduct electricity.

Day 5 4-14

Nonpolar Covalent bond - Covalent bond in which bonding electrons are shared equally by bonded atoms – balanced distribution of electrical charge

Polar Covalent bond - Covalent bond in which bonding electrons are shared unequally by bonded atoms – Uneven distribution of electrical charge

Covalent bonds can be polar or nonpolar

Ionic bonds

Polar Covalent

bonds

Nonpolar

Covalent bonds

Transfer elecs.

Share elecs.

What is the difference between polar and nonpolar covalent bonds?polar

Moving in the ionic direction

Atoms attract shared electrons unequally

nonpolar

Purely covalent

Atoms attract shared electrons equally

The Fight for Electrons – bonding as a tug-of-war

H H

HBr

TieCovalent

2.8 2.1

Polar Covalent

NaCl3.0 0.9

Ionic

The Fight for Electrons – bonding as a tug-of-war

Ionic BondsBonds are NEVER purely ionic!!!

Bonds are purely covalent when …

RbBr

Practice:

Rb and Cl

H and O

F and F

C and O

H and F

Predict only Calculate

Chapter Quiz will be on Tuesday 4-21!!!

REVIEW

3. What type of bonds are formed (ionic, polar, or nonpolar):

Mg and O = ________ bond

two atoms of H = ________ bond

H and Cl = ________ bond

Day 5 4-14

ionic

nonpolar

polar

4. What type of bonds are formed (single, double, or triple):

two atoms of O = _______ bond

Rb and F = ________ bond

N and P = _______ bond

Day 5 4-14

double

single

triple

This morning I slipped in some mystery liquid in the kitchen with the toaster, luckily for me I was not electrocuted, based on this do you think I was in an ionic or molecular compound?

http://www.youtube.com/watch?v=QqjcCvzWwww

http://www.youtube.com/watch?v=BCYrNU-7SfA

Electrostatic force

Anion

Ionic bond

Malleable

Alloy

Cation

Electrostatic force

Anion

Ionic bond

Malleable

Covalent compound

Cation