Goal for next time = ___% if you made your goal must improve by 1 Goal Setting Unit 5 Test = ___% I studied by … Goal for next time = ___% if you made your goal must improve by 1 Next time I will study by… Day 4 4-1

Draw the Lewis dot structure for berryllium bonded to fluorine. Q of the Day Day 2 4-9 Draw the Lewis dot structure for berryllium bonded to fluorine. 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? Objective How do elements combine to form compounds?

Covalent Bonding Covalent bonds - Chemical bonds that result from the sharing of electron pairs between two atoms But why bond?

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 Network (Crystal) Bonds Compounds Covalent Bonding Ionic Ionic Ionic Network (Crystal) Bonds Compounds - - + - + + - - + Covalent Molecular Individual molecules Bonds Compounds H-O-H O=C=O

Ionic Compounds Most 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 Compounds Weak interparticle forces Many are liquids or gases (H2O, CO2) Low melting / boiling points Not good conductors

Covalent Bonding 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)

Covalent Bonding 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)

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

Due tomorrow!!! Assignment Review sections 7.2 + 7.3 and complete #s 13, 17, and 18 on page 207 AND #s 20-22 and 25 on page 212 Due tomorrow!!!

? of the day Day 4 4-10 How are covalent and ionic compounds different? 2. Where would you find elements that form anions on the periodic table?

Revisiting Lewis structures: Covalent Bonding Revisiting Lewis structures: Do individual structures first As a general rule of thumb – most electroneg. Element goes in the middle (trial and error)

Covalent Bonding Multiple Bonds F2 O2 N2 CH4 C2H6 C2H4 CO2

Review 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 ? Review What type of bond: Cl—Cl ?

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

Due NOW!!! Assignment Review sections 7.2 + 7.3 and complete #s 13, 17, and 18 on page 207 AND #s 20-22 and 25 on page 212 Due NOW!!!

Nate’s girl does not belong to Nate Question of the Day Day 4 4-13 SirWalter, 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?

? of the day Day 4 4-13 Lewis Dot structure for CO2. 2. In an ionic bond electrons are ____, but in covalent bonds electrons are ____.

Question of the Day = ATB The bond formed between K and F would be _______ because … ______ compounds break apart into ______ when dissolved in water and conduct electricity. Ionic Ionic ions

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

Nonpolar Covalent bonds Covalent Bonding Covalent bonds can be polar or nonpolar Transfer elecs. Share elecs. Ionic bonds Polar Covalent bonds Nonpolar Covalent bonds

What is the difference between polar and nonpolar covalent bonds? 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 Covalent Tie Br H Polar Covalent 2.8 2.1

The Fight for Electrons – bonding as a tug-of-war Cl Na Ionic 3.0 0.9

Br Rb Ionic Bonds Bonds are NEVER purely ionic!!! Bonds are purely covalent when … Br Rb

Practice: Covalent Bonding Rb and Cl H and O F and F C and O H and F Calculate Predict only Rb and Cl H and O F and F C and O H and F

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

Assignment period 9 only We will have a quiz on the reading tomorrow #s 27, and 29-36, 38 on page 214 Read sections 7.1, 8.1 and 8.2 We will have a quiz on the reading tomorrow

Extended Question of the Day 3. What type of bonds are formed (ionic, polar, or nonpolar): Mg and O = ________ bond two atoms of H = ________ bond H and Cl = ________ bond ionic nonpolar polar

Extended Question of the Day 4. What type of bonds are formed (single, double, or triple): two atoms of O = _______ bond Rb and F = ________ bond N and P = _______ bond double single triple

Review 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?

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

Quick Talk Electrostatic force Anion Ionic bond Malleable Alloy Cation

Quick Draw Electrostatic force Anion Ionic bond Malleable Covalent compound Cation