Covalent Bonding and Lewis Structures

Covalent Bonding

100

Are electrons shared or stolen between atoms when making a covalent bond?

shared

200

What is the strongest possible type of covalent bond?

(single, double, triple bond)

triple bond

300

How many sigma and pi bonds are in C₂F₄?

5 sigma

1 pi

make sure that double bond is between the carbons

400

Does nitrogen, N₂, or oxygen, O₂, have a higher bond dissociation energy?

N₂, it has a triple bond which is harder to break.

500

NH₃ is polar. N₂ is nonpolar. 

Which would you expect to have a higher melting point?

The polar molecule, NH₃ will have a higher melting point. 

Polar molecules "stick" to each other, creating tighter forces between molecules. It take more energy (higher temperatures) to break these forces for melting.

Lewis Structures

100

When drawing a Lewis structure, what are the TWO things you should check for at the end?

Correct number of electrons

Octet/duet rule followed

200

Draw the Lewis structure for HCO₂^-

Let's look at boards! Did you draw resonance structures? Did you draw the brackets and the charge?

300

EXCEPTION ALERT

Draw the Lewis structure for ClF₅.

Let's look at some boards!

400

Which one of these has resonance?

NF₃     HCN      NO₂^-

NO₂^-

500

Draw COF₂

Let's look at boards!

Shapes

100

What is the shape of N₂?

Linear

200

What is the shape of H₂S?

Bent

300

EXCEPTION ALERT

What is the shape of BCl₃?

trigonal planar

400

What is the shape of CH₂F₂?

tetrahedral

500

What is the shape of HNO?

Bent

Electroneg. and Polarity

100

Hydrogen (H) and phosphorus (P) have what type of covalent bond?

Electronegativity H = 2.2

Electronegativity P = 2.19

2.2 - 2.19 = 0.01      Nonpolar bond

200

Is SO₃ a polar or nonpolar molecule?

Nonpolar molecule

300

Name this covalent molecule: Si₇I₉

heptasilicon nonaiodide

400

Is CO₃^2- a polar or nonpolar molecule?

nonpolar

500

Which has STRONGER intermolecular forces between molecules?

H₂O or CO₂

H₂O is polar,    CO₂ is nonpolar

H₂O is going to have stronger IMFs

Mrs. Onushko

100

Where did Ms. Johnson go to college for both her bachelors and masters degree?

University of Minnesota - Twin Cities

Go Gophers!!

200

What is the name of Ms. Johnson's precious puppy?

Bonus point: Describe him to the best of your ability.

Murphy!

White, fluffy, the cutest, snuggly, polar bear, adorable, sweet, the best, smooshable face, sleepy, cuddly, wild, just-the-best

300

What is one of the two sports Ms. Johnson played growing up?

Bonus: Get both correct

No points: getting one of the two wrong

Soccer and Hockey

400

How old is Ms. Johnson

27

500

How many years has Ms. Johnson been teaching at Park Center?

4 years