CHEM 1251 Final Exam Review

Atoms

100

A bubble has a volume of 0.0054 cubic centimeters. What is this volume in cubic meters?

0.0000000054

200

How many unpaired electrons does iron have?

DOUBLE JEOPARDY question if answered correctly!

6

DOUBLE JEOPARDY: What is the shape of the orbital that houses the unpaired electrons?

300

Calculate the number of moles that are in 304.1 g of zinc.

4.649 moles

400

Rank these atoms from smallest (first) to largest (last):

chlorine, neon, boron, sodium

DOUBLE JEOPARDY question if answered correctly!

Ne < B < Cl < Na

DOUBLE JEOPARDY: Explain why atoms get smaller as we move across a period (left to right).

500

Provide the electron configuration for Co²⁺.

DOUBLE JEOPARDY question is answered correctly!

[Ar]3d⁷

DOUBLE JEOPARDY: Is Co²⁺ larger or smaller than Co?

Molecules and Compounds

100

Provide the chemical formula for nickel(II) phosphate.

Ni₃(PO₄)₂

200

How many moles of potassium ions are in 3.00 kg of potassium carbonate?

43.4 moles of K⁺

300

What is the mass percent of carbon in carbon tetrachloride?

7.8%

400

The ionization energies of McKenzium, a yet-to-be discovered element you saw on Exam 1, are provided below. How many valence electrons does McKenzium have?

IE1 = 700 kJ/mol

IE2 = 1900 kJ/mol

IE3 = 2300 kJ/mol

IE4 = 9010 kJ/mol

IE5 = 10117 kJ/mol

3

500

Determine the molecular formula of a compound that is 48.6% C, 8.2% H, 43.2% O, and has a molar mass of 222 g/mol.

C₉H₁₈O₆

Reactions (no math)

100

What is the net ionic equation when HBr and LiOH are combined?

DOUBLE JEOPARDY is answered correctly!

H⁺ + OH^- --> H₂O

DOUBLE JEOPARDY: What type of reaction was described previously?

200

Does a precipitate form when nickel(II) chloride and lithium carbonate react? If so, name the precipitate.

Yes, nickel(II) carbonate.

Reactions (math)

100

What is the oxidation state of manganese in potassium permangante?

+7

Bonding

100

Draw a valid Lewis structure for hydrogen peroxide (H₂O₂). Hold your drawing up to answer.

Dr. Eric approves :)

300

Draw a valid Lewis structure for C₂H₄. Hold up your drawing to answer.

DOUBLE JEOPARDY if answered correctly!

Dr. Eric approves :)

DOUBLE JEOPARDY: Is the bond between the two carbons stronger or weaker than a single bond?

500

Draw a valid Lewis structure for CH₂O₂. Hold your drawing up to answer.

Dr. Eric approves :)