Chem 121 Review

Elements, Atoms, and the Periodic Table

100

On the periodic table, which direction(s) does electronegativity increase?

Up and to the right

200

This isotope has 5 protons and 6 neutrons.

Boron 11

300

Boron's noble-gas electron configuration.

[He]2s2 2p1

400

Noble gas configuration for P^ 3-

1s2 2s2 2p6 3s2 3p6

500

Write aluminum-23 in isotope notation

13 protons, 13 electrons, 14 neutrons

Ionic and Covalent Bonding

100

Draw the lewis diagram for Carbon

4 valence electrons

200

Name this molecular compound:

N₂O₅

dinitrogen pentoxide

300

Write the ionic compound formula:

Ammonium and carbonate

(NH₄)₂CO₃

400

Determine in the following molecule is polar or nonpolar:

CH₃Cl

Polar

500

Draw the lewis structure for H₂CO and name the molecular geometry

Trigonal Planar

Chemical Reactions

100

Balance this equation:

_N₂(g) + _H₂(g) -> NH₃(g)

1 N₂(g) + 3 H₂(g) -> 2 NH₃(g)

200

What type of reaction is this?

2C₆H₆(l) + 15O₂(g) -> 12CO₂(g) + 6H₂O(g)

Combustion

Hydrocarbon + Oxygen + (heat) = Water + Carbon dioxide

300

What is the oxidation state of Carbon?

CH₄

-4

H is always +1, (1(4))+(-4)=0

400

How many grams of carbon dioxide are produced if a chemist starts the reaction with 5.24 grams of propane?

C3H8 + 5O2 → 3CO2 + 4H2O

5.24 𝑔 × (1 𝑚𝑜𝑙𝑒/44.097 𝑔) × (3 𝑚𝑜𝑙𝑒 𝐶𝑂2/1 𝑚𝑜𝑙𝑒 𝐶3𝐻8) × (44.009 𝑔/1 𝑚𝑜𝑙𝑒) = 15.7 𝑔

500

How much heat is necessary to vaporize 75.0 g of ethanol at its boiling point? The heat of vaporization of ethanol is 200.3 cal/g

𝑞 = 𝑚Δ𝐻_𝑣𝑎𝑝 = 75.0 𝑔 ∙ 200.3 𝑐𝑎𝑙/𝑔 = 1.50 × 10⁴𝑐𝑎𝑙

Solids, Liquids, and Gases

100

List the intermolecular forces from weakest to strongest

London dispersion

Dipole-dipole

Hydrogen bonding

Ionic Bonding

200

Draw what solid, liquid, and gas phases look like in a flask.

Picture

300

Which gas law relates the volume of gas to its temperature?

Charles law

V1/T1 = V2/T2

400

Identify which of the intermolecular forces this molecule exhibits:

HF

Hydrogen bonding (H is on the FON)

500

How many moles of gas are inside a cylinder with volume 5.0 L,
pressure of 8.0 atm and temperature of 430 C?

0.69 moles

Solutions Acids & Bases

100

How do you find Molarity?

moles of solute/volume in liters

200

How many grams of solute are needed to prepare 5.00 L of a 0.100 M CaCl2 solution?

55.5 g CaCl2

300

What pH is considered basic, neutral and acidic?

Basic:>7

Neutral: 7

Acidic:<7