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Nomenclature

100

Give formula for barium fluoride

BaF₂

200

Give the name for P₄S₅

tetraphosphorus pentasulfide

300

Give the name for CuBr

Copper (I) Bromide 

400

Give the formula for ammonium sulfite

(NH₄)₂SO₃

500

Give the formula for nitric acid

HNO₂

Bonding Basics

100

Three types of intramolecular bonds and role of electrons 

Ionic - transferred, covalent - shared, metallic - delocalized 

200

Type of bond likely when there is a large (over 1.5) electronegativity difference between atoms. 

Ionic 

300

What type of substance typically have very low melting and boiling points, do not dissolve in water, cannot conduct electricity. They can be solid, liquid, or gas at STP, but they are mostly gases and liquids.

non-polar covalent molecules 

400

What type of substance is crystalline, high melting point, electrically conductive when melted or dissolved in water. Solids at STP.

Ionic 

500

What type of substance could form silver crystals that do not dissolve in water and have a very high melting point of 1414C.  This material is very hard and is not a good conductor of electricity. 

Covalent network solid 

Resonance and Formal Charge

100

Which molecule has resonance? CO₂ or CO₃^2-? Must be able to justify your answer. 

CO₃^2-

200

Why do the bonds in resonance structures all have the same bond length? 

The true structure is a hybrid of all possible bond structures. 

300

How is formal charge related to exceptions to the octet rule. 

Some elements will exceed octet for have less than octet to achieve a zero formal charge or lowest formal charge where most EN has neg. charge. 

400

Based on formal charge considerations, which of the following would likely be the correct arrangement of atoms in nitrosyl chloride: Cl-N=O or Cl=O=N ?

Cl-N=O

500

How is the molecule of PO₄^3- a great example of resonance and formal charge? 

Phosphorous will break octet in order to have a formal charge of 0. To do this it needs one double bond that it is delocalized between all P-O bonds. 

VSEPR and hybridization

100

What is the difference between a molecules molecular geometry and electron geometry? 

electron geometry is taking into account lone pairs and molecular geometry is only bonding domains. 

200

What does VSEPR stand for? 

Valence shell electron pair repulsion 

300

Give electron geometry and molecular geometry for NH₃

tetrahedral, trigonal pyramidal 

400

Give electron geometry and molecular geometry and hybridization for SO₂

trigonal planar, bent, sp²

500

Give electron geometry and molecular geometry and hybridization for BrF₃

Trigonal bipyramidal, T-shaped, sp³d

IMF and Lattice

100

What are the three intermolecular forces? 

Hydrogen bonding, di-pole di-pole, and LDF

200

Which of the following would have the highest boiling point. NH3 or PH3? Explain 

NH3 - hydrogen bonding 

300

Which substance do you think will have the highest melting point? Explain : NaBr, CaBr2

CaBr2 - higher lattice energy due to the hight ionic charge on Calcium 

400

Which has the highest melting point? KF, CsF, or HF? 

KF - hight lattice energy. KF is a lattice bond held together by intramolecular electrostatic attraction. HF while a strong hydrogen "bond" is an intermolecular attraction between molecules. 

500

Which has the highest melting point? Explain. H2, CH4, C2H4

C2H4 bc it is a bigger molecule with more surface area. This allows for more affection LDF.