SWBAT draw Lewis Dot Structure for covalent bonding
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1 Unit 5 NAME Class Work 1/4/ Covalent Bonding SPARK (Take out your 5.4 WS) Name the following compounds: 1) Si 3 N 4 2) BaSO 4 3) Ca(ClO 3 ) 2 Be ready to quickly go over the homework! ObjecSve SWBAT draw Lewis Dot Structure for covalent bonding
2 Agenda: SPARK/ObjecSve Lesson PracSce Exit Ticket Homework
3 Naming Quiz When you are finished, pick up your two Winter Break Packets You will complete: 200 Things to know for the chemistry Regents which will count for 3 homework grades The 93 regents quessons (on the answer sheet) which will count as a take home quiz!
4 Why do covalent bonds form?
5 Covalent Bonds Nonmetallic atoms share valence electrons to form stable electron configurations.! A covalent bond results from two atoms sharing one electron.! A molecule can form when two or more atoms bond covalently.! Question:! Is energy released or required!!!for a covalent bond to form?!
6 Lewis Dot Structures Lewis dot structures can be used to show the sharing of electrons Can share more than one pair of electrons
7 Diatomic Molecules Can a fluorine bond with another fluorine?!
8 Diatomic Molecules Diatomic molecules never exist by themselves as single atoms. Why???! Ex: Really! Cl2, F2, H2 (hint: you can draw the Lewis Structures!)! Have No Fear of Ice Cold.Brisk.!
9
10 Diatomic Molecules + --->
11 DRAW! Draw Lewis Dot structures Cl 2 Use x s to represent the electrons from one atom and o s to represent the electrons from another atom Example: xx oo x Br x o BR o x xx oo o
12 Group 16 forms two bonds. Why?! Look at O 2! Group 16
13 Group 15 Group 15 forms 3 bonds. Why?! Ex: N 2! Ex. 2 - Ammonia, NH3! Draw structure of NH 3!
14
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16 Group 14 Group 14 can form 4 bonds. Why?! Ex: CH4, methane!
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18 Steps to Drawing Covalent Bonds Step 1: Determine the type and number of atoms in the molecule. H 2 O 2 Hydrogen atoms 1 Oxygen atom REMEMBER: Our subscripts tell us how many atoms of each element exist in the molecule. No subscript??? Means 1 atom
19 Steps to Drawing Covalent Bonds Step 2: Determine the total number of valence electrons in the atoms to be combined. H O H=(1 x 2) = 2 2 O = 6 Total = 8
20 Steps to Drawing Covalent Bonds Step 3: Arrange the atoms to form a skeleton structure for the molecule H O H H 2 O Each bond represents 2 electrons: These electrons are shared by both atoms
21 Hints for a skeleton structure: 1. The least-electronegative atom is central 2. If Carbon is present, it is the central atom 3. Hydrogen is NEVER central What is the trend in electronegasvity on the periodic table??
22 Electronegativity: the tendency of an atom to attract shared electrons toward
23 Steps to Drawing Covalent Bonds Step 4: Add unshared pairs of electrons so each atom has an octet (except H) A single line is used to represent a single bond H 2 O H O H
24 Steps to Drawing Covalent Bonds Step 5: Check # of valence electrons used equals the number available. Check that all atoms have 8 valence electrons!!!! (Except hydrogen which should have 2 valence electrons)
25 Name and draw the following: 1. N 2 O 4 2. P 3 Cl 6 3. SO 3 4. CO 2 5. NH 3
26 Independent Work Complete 5.5 Worksheet Finish for homework!
27 HOMEWORK Finish 5.5 independent pracsce sheet! Read pages and Try two quessons on page 174
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