CHEM 1306 Exam 2 Review

Module 4

100

What phase transition describes the transition from a gas to a solid?

Deposition

200

List ALL the intermolecular forces are present between propanoic acid and butanol.

1. LDF

2. Dipole-Dipole

3. Hydrogen Bonding

300

Which of the following molecules can form a hydrogen bond with each other?

A. Acetic acid

B. Acetone (2-propanone)

C. Ethanol

D. Hexene

A. & C. Acetic Acid and Ethanol

400

Which molecule has the lowest vapor pressure?

A. Methanol             BP: 64.7^oC

B. Ethanol               BP: 78.7^oC

C. Benzene              BP: 80.1^oC

D. Methanoic Acid    BP: 100.8^oC

D. Methanoic Acid

500

Sketch the phase diagram for Nitrogen (N) in the atmosphere. The boiling point of nitrogen is -195.8^oC and the freezing point of nitrogen is -210.0^oC. The triple point occurs at 63.1K at 94.0 torr. 

(Please label your units for pressure in atm and temperature in kelvin)

(Show Image)

Module 5

100

State Raoult's law. State what each variable in the equation stands for. 

P_A=X_AP_A^o

P_A: Vapor pressure above the solid-liquid solution

X_A: Mole fraction of the solvent in the solution

P_A^o: Vapor pressure of pure solvent in equilibrium at given temperature

200

How many grams are needed to dissolve 27.8g of ammonium nitrate in order to prepare a 0.452m ammonium nitrate solution

769.0g NH₄(NO₃)

300

We're using water as a solvent and adding solute (Q). We add 3.8 grams of solute (Q) to our solvent and the freezing point changes to -2.37oC. Solute (Q) will split into two ions. If our solvent has a Kf = 1.86oC/mol, and we initially have 10mL of water, what is the molar mass of the solute (Q).

596.456g solute (Q)

400

Which of the following is expected to have the lowest freezing point and highest osmotic pressure? Why?

A. 1M Hydrofluoric Acid solution

B. 1M Calcium Phosphate solution

C. 1M Barium Oxide solution

C. Calcium phosphate 

Contains the most ions when dissolved influencing the colligative properties. 

500

Which of the following aqueous solutions has the highest boiling point? K_b for water is 0.52^oC/m

A. 0.3m Potassium Chloride

B. 0.4m Hydrofluoric Acid 

C. 0.2m Sodium Sulfate

D. 0.2m Aluminum Nitrate

E. Not enough information is provided

D. Aluminum Nitrate

Module 6

100

What are the units of k in a rate expression if the overall order of the reaction is 3?

M^-2s^-1

M^-2/s

200

State the rate expression for the following chemical reaction.

_HCl_(aq) + _NaOH_(aq) --> _NaCl_(s) + _H₂O_(l)

-Δ[HCl]/Δt = -Δ[NaOH]/Δt = Δ[NaCl]/Δt = Δ[H₂O]/Δt

300

What is the rate law for the following chemical reaction? 

_Zn + _HCl --> _ZnCl₂ + _H₂

rate law = k[Zn]^x[HCl]^y

400

Find the complete rate law for the following chemical reaction and determine the rate constant and its units. 

D + E --> F

(Show the table)

Rate law = k[D]²[E]⁰

k = 0.1 M^-1s^-1

500

Find the complete rate law of the following reaction and determine the value and units of the rate constant. 

_F_{2 (g)} + _ClO_{2 (g)} --> _FClO_{2 (g)}

(Show table)

Rate law = k[F₂][ClO₂]

k = 1.2 M^-1s^-1

Module 7

100

Give the concentration-time equation and half-life equation for a 1^st order reaction. 

Concentration-time equation : ln[A]_t = -kt + ln[A]₀

Half-life equation : t_1/2 = ln(2)/k

200

A first-order reaction has a half-time of 12.5 seconds. The time required for the reaction to be 75% complete is?

25 seconds

300

A second order reaction has a rate constant of   5.8x10^-4 s^-1. What is the half-life of the reaction if our initial concentration is 1.7M? What if our concentration is 0.5M?

[A]₀ = 1.7M, then t_1/2 = 1014.20sec

[A]₀ = 0.5M, then t_1/2 = 3448.28sec

400

The following reaction is found to be zeroth order in X and first order in Y with a half-life of 10.0 minutes. 

X + 2Y --> 3Z

The initial conditions are [X]₀ = 0.20M, [Y]₀ = 0.10M, and [Z]₀ = 0.0M. Draw a reasonable sketch of the progress of the reaction to completion 

Then identify the rate law for this reaction, along with the rate constant value and its units. 

(Show picture of sketch)

rate law = k[X]⁰[Y]

k = 0.0693 M^-1s^-1

500

A + 3B --> 2L

This reaction is first order overall. [A]0 = 0.50M, [B]0 = 0.50M, and [L]0 = 0.0M. The data points for the progress of [B] versus time is shown in the graph, draw the curves for a [A] versus time and for [L] versus time. 

(Show picture of plot)

Then identify the rate law, and determine the value of k and its units.

(Show picture of graph)

rate law = k[A]⁰[B]

k = 0.077 M^-1s^-1

Trivia

100

What is the highest-grossing animated film of all time?

Lion King (2019 remake)

200

Which country won the first FIFA World Cup in 1930?

Uruguay 

300

How many elements are in the periodic table?

118

400

What is the only letter of the alphabet not to appear in the name of any US state?

"U"

500

What is the technical name of the "#" symbol?

Octothorpe