CHEM 1311 Exam 2

Nomenclature

100

Al(ClO₄)₃

Aluminum perchlorate

200

HClO₃

Chloric acid

300

Iron(III) sulfite

Fe₂(SO₃)₃

400

H₂SO₃

sulfurous acid

500

Copper(II) sulfate pentahydrate

CuSO₄·5H₂O

Lewis Structure

100

Draw the best Lewis structure for NO₂⁺

check notes

200

Draw the best structure for SF₅^-

check notes

300

Draw ALL structures for CO₃^2-

• Central atom: C

• Three equivalent resonance structures

• Each has a double bond to one O and single bonds to the other two

400

Draw ALL structures for O₃

one single bond and one double bond, equivalent structures

500

Draw the best structure for CH₂O

see notes

Polyatomic Ions

100

hydroxide

OH^-

200

acetate

C₂H₃O₂^-

300

carbonate

CO₃^2-

400

NO₃^-

nitrate

500

PO₄^3-

phosphate

Math

100

Calculate the molar mass of an unknown compound if 0.528 mole of it has a mass of 110 g.

208 g/mol

200

How many grams of fluorine are contained in 25.0 grams of CCl₂F₂ ?

7.86 g F

300

Determine the number of ammonia molecules in 38.0 g of ammonia.

1.344 x10²⁴ molecules NH₃

400

An organic compound which has the empirical formula CHO has a molar mass of 145.0 g/mol. What is its molecular formula?

C₅H₅O₅

500

A compound has a molecular mass of 416.41 g/mol, and is made up of 14.88% phosphorus and 85.12% chlorine. What is the molecular formula for this compound?

P₂Cl₁₀

Misc.

100

Which of the following atoms/ions has the largest radius?

Na⁺  Mg²⁺  S^2-  Cl  Cl^-

S^2-

200

Arrange the following elements in order of increasing electronegativity:

S   O   Si   Mg

Mg < Si < S < O

300

Which of the following ions is isoelectronic to a noble gas?

H⁺    Cl⁺    Mg⁺    Ba²⁺    N^2-

Ba²⁺

400

shorthand notation for Zr²⁺

[Kr] 4d²

500

When considering the bond between C and H...

- is it polar or non polar? covalent or ionic?

non polar covalent