Day 2 Warm-Up

Warm-Up #1

Draw the Lewis dot structure for barium nitride.

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Ba²⁺

N^3-

Ba₃N₂

Ba²⁺

Ba²⁺

Ba²⁺

Warm-Up #2

Identify each of the properties as ionic (I), covalent (C), or metallic (M)

1. Electrons are shared between atoms. ____
2. Can only conduct electricity when dissolved in water. ____
3. Lustrous and ductile. ____
4. Occurs between atoms with very different electronegativities. ____
5. Low melting point. ____
6. Mobile sea of electrons. ____

C

I

M

I

C

M

Day 3 Warm-Up

Warm-Up #1

Of P₂, S₂, and Br₂ which molecule contains the strongest bonds?

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P₂ because triple bonds!

H

(2 e^-)

4

tetrahedral

3

trigonal pyramidal

H

(2 e^-)

B

(6 e^-)

3

trigonal planar

3

trigonal planar

Day 4 Warm-Up

Warm-Up #1

Which of these bonds should be the most polar?

• C – S
• C – O
• C – Se
• C – C

Biggest EN difference

C is low EN

Pair with highest EN

Warm-Up #2

Which of the following correctly lists the molecular geometry, bond polarity, and molecular polarity for a molecule of CS₂?

• Geometry = bent, Bonds = polar, Molecule = polar
• Geometry = linear, Bonds = polar, Molecule = polar
• Geometry = bent, Bonds = nonpolar, Molecule = nonpolar
• Geometry = linear, Bonds = polar, Molecule = nonpolar

Warm-Up #3

Which of the following correctly lists the molecular geometry and molecular polarity for a molecule of BCl₃?

• Geometry = trigonal pyramidal, Molecule = polar
• Geometry = trigonal pyramidal, Molecule = nonpolar
• Geometry = trigonal planar, Molecule = nonpolar
• Geometry = trigonal planar, Molecule = polar

Warm-Up #4

Which of the following correctly lists the molecular geometry and molecular polarity for a molecule of CH₂F₂?

• Geometry = trigonal pyramidal, Molecule = polar
• Geometry = trigonal pyramidal, Molecule = nonpolar
• Geometry = tetrahedral, Molecule = polar
• Geometry = tetrahedral, Molecule = nonpolar

Day 5 Warm-Up

Warm-Up #1

Draw the Lewis structure for magnesium nitride.

Mg²⁺

N^3-

Mg₃N₂

Mg²⁺

Mg²⁺

Mg²⁺

Warm-Up #2

Which of the following elements will always be an exception to the octet rule?

1. P
2. Xe
3. B
4. F

CAN be exceptions, but don’t HAVE to be

Will NEVER be an exception

Warm-Up #3

An unknown substance is inspected and is determined to be a good conductor of electricity when dissolved in water, but not in its solid form. Which answer choice provides a likely identity of the substance as well as an explanation for the behavior.

1. Carbon tetrafluoride, because its electrons are delocalized and mobile.
2. Rubidium perchlorate, because its electrons are evenly shared between the nuclei.
3. Cobalt, because it has a sea of electrons.
4. Silver chromate, because ions can only conduct electrical current when dissolved in water.

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Day 6 Warm-Up

Warm-Up #1

Which of these best explains VSEPR Theory?

1. Electrons surrounding an atom will adopt a shape to be as close as possible to other electrons.
2. Electrons surrounding an atom will adopt a shape to be as far as possible from other electrons.
3. Electrons surrounding an atom will adopt random shapes every time a molecule forms.
4. Electrons surrounding an atom will adopt a shape based on the polarity of each bond.

valence

shell

electron

pair

repulsion

Warm-Up #2

Which of these best describes hydrogen bonding?

1. A pair of shared electrons between hydrogen and any element
2. A pair of shared electrons between hydrogen and F, O, or N.
3. An attraction between molecules cause by hydrogen bonding to any element.
4. An attraction between molecules cause by hydrogen bonding to F, O, N.

Warm-Up #3

Which of the following molecules would experience the greatest intermolecular forces?

1. BF₃
2. BH₃
3. NH₃
4. NF₃

B

F

F

F

B

H

H

H

N

F

F

F

N

H

H

H

nonpolar

LDFs

nonpolar

LDFs

polar

H-bonding

has N-H

polar

dipole-dipole

no N-H