Honors Chem, Test 3

The Name's Bond.... Ionic Bond

100

How do you name CaCl₂?

Calcium Chloride

200

Write the name for the compound Mn₂S₇. (Include roman numeral.)

Manganese (VII) Sulfide

300

Write the formula for strontium perchlorate.

Sr (ClO₄)₂

400

Write the formula for Nickel (III) Sulfite.

Ni₂(SO₃)₃

500

What is the formula for ammonium permanganate?

(NH₄)(MnO₄)

Mole-Cool-ar Naming

100

Write the formula for dihydrogen monoxide.

H₂O

200

What is wrong about the name monocarbon dioxide?

"Mono" prefix never goes on first nonmetal.

300

What is the formula for Xenon octafluoride?

XeF₈

400

What is the name of P₃O₈?

Triphosphorus octoxide 

500

What would be the name for P₇S₉?

Heptaphosphorus Nonasulfide

Ironic Ionic

100

In the ionic compound NaBr, which element acts as a cation and which one acts as an anion?

Cation - Sodium (cation is always the metal)

Anion - Bromine

200

Recall how to calculate a compound's END (electronegativity difference). 

If Calcium has electronegativity of 1 and Fluorine has an electronegativity of 4.0, what is the total electronegativity difference in CaF₂?

3

300

How many total electrons would you calculate in the following compound: PO₄^-3

32 electrons

400

Draw the electron dot diagram for LiCl.

Answer.

500

What do you call the force that holds the ions together in the compound? 

Electrostatic force.

Covert Covalent

100

What is the name of the rule that states an element wants a set of eight valence electrons in order to be stable?

Octet Rule

200

1) What is the difference between intermolecular and intramolecular forces? 

(for extra +200 pts, which force is stronger?)

Inter --> between multiple molecules

Intra --> within the same molecule

Intra is stronger.

300

If a C-C bond has a bond length of 154pm, and an H-H bond has a bond length of 74pm, which molecule has the greater bond energy?

H-H ; recall, the shorter the bond length, the greater the bond energy

400

When drawing Lewis structures, what element do you ALWAYS put in the center? 

(Bonus +400, if that element is not present, how do you determine what element to draw as the central atom?) 

Carbon ; atom with least electronegativity.

500

Draw the three resonance forms for SO₃.

Answer.

VSEPR Theory and Molecular Polarity

100

According to END, what is the range for polar molecules? 

0.4 - 1.7

200

What is the molecular geometry for water, H₂O?

Bent

300

What do the letters in VSEPR stand for?

Valence Shell Electron Pair Repulsion

400

Is CO₂ polar or nonpolar?

Nonpolar

500

What is the molecular geometry for a molecule whose central atom has 3 shared pairs and 1 lone pair of electrons?

Trigonal Pyramidal