1. Chemistry Do Now
Directions: Take out your Do Now sheet and answer each question based on yesterday’s slime lab. 1) What were the 3 ingredients used to make your slime? 2) What effect did the borax have on the glue and water? 3) Describe the type of interaction between the Elmer’s glue, water and borax? Were the intermolecular forces between the glue, water and borax stronger or weaker than each of their intramolecular forces? Why or why not? 4) What did you notice as you added more borax solution to the glue? Why do you think you got this result?

2. Chemistry Do Now KEY
1) What were the 3 ingredients used to make your slime? Glue, food coloring and borax solution 2) What effect did the borax have on the glue and water? It make the glue become more solid, almost rubber-like. 3) Describe the type of interaction between the Elmer’s glue, water and borax? Were the intermolecular forces between the glue, water and borax stronger or weaker than each of their intramolecular forces? Why or why not? The borax seemed to get between the glue and water molecules, but the intermolecular forces within the glue were still stronger than the intramolecular forces between the glue molecules because the chemical bonds holding the glue together was stronger than the attractive forces between the glue and the borax solution. 4) What did you notice as you added more borax solution to the glue? Why do you think you got this result? I noticed the more borax solution I added, the more solid the glue/water solution became because the borax was attracted to the glue and water.

3. Objective
Students will know how intermolecular forces (IMFs) between atoms that share pairs of electrons (covalent bonding) determine the properties of the molecule by performing a close read on forming polymers, answer text-dependent questions based on the article, take notes on covalent bonding and answering . Mastery Level: 25 pts. on close read annotations, 4/6 (67%) on TDQs, and ¾ on exit ticket questions

4. Homework - Copy
Research any five molecules that are held together by covalent bonds. Compare and contrast them.

5. Engage
Show the students the YouTube video “Covalent Bonding” Source: Ov1foc

6. Explore
Students will perform a close read on the Slime article. As the students read the text, they will annotate using the symbols posted on charts in the classroom. Following their annotations, the students will answer 6 scaffolded text- dependent questions. 1) What is the main idea of the article? 2) Cite 3 statements from the article to support your main idea. 3) The author uses two illustrations in the article. How does the author use the pictures to help the reader understand polymerization? 4) What is the author’s purpose for writing this article: entertainment, information or persuasion? How do you know? 5) How is the text organized to help build your understanding of the main idea? 6) Now that you have read the article, explain what the author failed to discuss? Explain why this topic should have been discussed in the article. Where should this topic have been mentioned in the article? Why?

7. Explain intermolecular forces (covalent bonding)
Students will take notes.
Explain intermolecular forces (covalent bonding)

8. Covalent Bonding
Unit III: Combining Atoms
October 18, 2017

9. Review of Ionic Bonding
We learned about electrons being transferred (“given up” or “stolen away”).
This type of “tug of war” between a METAL and NONMETAL is called an IONIC BOND, which results in a SALT being formed

10. Molecular Compounds
Now, you will learn about another type of bond in which electrons are shared
Covalent Bonds are atoms held together by SHARING electrons between NONMETALS

11. Salt versus Molecules
A metal cation and nonmetal anion are joined together by an ionic bond called SALT
A group of atoms joined together by a covalent bond is called a MOLECULE
A Compound is a group of two or more elements bonded together (Ionic or Covalent).

12. Ionic vs Covalent

13. Monatomic vs. Diatomic Molecules
Most molecules can be monatomic or diatomic
Diatomic Molecule is a molecule consisting of two atoms
There are 7 diatomic molecules (SUPER 7) – N2, O2, F2, Cl2, Br2, I2, H2
You can also remember them as: H2O2F2Br2I2N2Cl2

14. Properties of Molecular Compounds
Liquids or gases at room temperature
Lower Melting Points than Ionic Compounds (which means that they are weaker than ionic)

15. Molecular Formulas
The Molecular Formula is the formula of a molecular compound
It shows how many atoms of each element a molecule contains
Example
H2O contains 3 atoms (2 atoms of H, 1 atom of O)
C2H6 contains 8 atoms (2 atoms of C, 6 atoms of H)

16. Practice
How many atoms total and of each do the following molecular compounds contain? H2 CO
CO2
NH3
C2H6O

17. Practice: True or False
All molecular compounds are composed of atoms of two or more elements.
All compounds are molecules.
Molecular compounds are composed of two or more nonmetals.
Atoms in molecular compounds exchange electrons.
Molecular compounds have higher melting and boiling points than ionic compounds.

19. Ionic versus Covalent IONIC COVALENT Bonded Name Salt Molecule
Bonding Type
Transfer e-
Share e-
Types of Elements
Metal & Nonmetal
Nonmetals
Physical State
Solid
Solid, Liquid, or Gas
Melting Point
High (above 300ºC)
Low (below 300 ºC)
Solubility
Dissolves in Water
Varies
Conductivity
Good
Poor

20. Covalent Bonding
Remember that ionic compounds transfer electrons in order to attain a noble gas electron configuration
Covalent compounds form by sharing electrons to attain a noble gas electron configuration
Regardless of the type of bond, the Octet Rule still must be obeyed (8 valence electrons)

21. Single Covalent Bond
A Single Covalent Bond consists of two atoms held together by sharing 1 pair of electrons (2 e-)

22. Single Covalent Bond
A Single Covalent Bond consists of two atoms held together by sharing 1 pair of electrons (2 e-)

23. Double Covalent Bonds
Sometimes atoms attain noble gas configuration by sharing 2 or 3 pairs of electrons
A Double Covalent Bond is a bond that involves 2 shared pairs of electrons (4 e-)

24. Triple Covalent Bond
A Triple Covalent Bond is a bond that involves 3 shared pairs of electrons (6 e-)

25. Covalent Bonds

26. Extend
1) Explain how a single covalent bond is formed, double covalent bond, and a triple covalent bond. 2) Draw a Venn diagram comparing and contrasting a nonpolar and polar covalent bond.

27. Evaluate
Exit Ticket Questions on IMF 1) What are the differences between an ionic and a covalent bond? 2) What is meant by unequal sharing of electrons? How does this result in the formation of a polar molecule? 3) What is meant by equal sharing of electrons? How does this result in the formation of a nonpolar molecule? 4) Which type of bond, ionic or covalent, has the higher intermolecular force? How do you know?
SKILL MASTERY LEVELS (Based on 100 maximum points): 4/4 correct (100 points): SKILL EXCEPTIONALLY MASTERED 3/4 correct (75 points): SKILL ADEQUATELY MASTERED <3/4 correct (<75 points): SKILL NOT MASTERED