chem 002LB

n*

Moles of H2 per gram of sample

Redox Reaction

A reaction that invovles the transfer of electrons.

What is the oxidation number of a naturally occurring substance (i.e diatomic molecules)

ZERO

q

Heat

On a graph of vapor pressure of a liquid v.s. temperature what is on the x and y axis?

ln(VP) = Y AXIS

1/T = X AXIS

@ BOILING POINT

What is the relationship between vapor pressure and barometric pressure

Vapor pressure will equal barometric pressure @ boiling point.

For our lab purposes, freezing point depression was used to calculate...

Molar Mass

Acid

Proton donor

Monoprotic Acid

Acid with ONE acidic proton

Polyprotic Acid

Acid with more than one acidic proton

Base

Proton acceptor

Molar Mass

g/1 mol of a compund

Equivalence Point

A point in the titration where moles of H+ = moles of OH-

Cation

Positive ion

Anion

Negative ion

Halogen

HONClBrIF

(they are also all diatomic)

Oxidation

Loss of electrons

Reduction

Gain of electrons

Oxidizing agent

Electron acceptor

Reducing agent

Electron donor

1 atm equals how many mmHg?

760mmHg = 1atm

What R constant is used in the PV = nRT equation?

.0821 Latm/Kmol

Where is the formula for %Al?

On the periodic table sheet

When you see calorimetry in the question, what formula should you automatically think of?

q=cmdeltaT

Specific Heat Capacity of water?

4.18 J/g*C

What does OILRIG stand for?

Oxidizing is losing

Reduced is gaining

What does deltaTf stand for?

Change in freezing point of a solution

What is the freezing point of pure water?

0.0 C

Rate Law Formula

Rate = k[A]^a*[B]^b*[C]^c

How do you find the rate law given a table of concentrations and initial rates?

Step 1)

Find the ratio of initial rates.

Step 2)

Set this number equal to the ratio of the corresponding concentrations raised to an unknown exponent.

Step 3)

Solve for the unknown exponent.

Step 4)

Plug into the rate law formula

What formula relates deltaH of vaporization to the slope of a line?

slope = -deltaH of vaporization / R

What R is used in the formula that relates deltaH of vaporization to the slope of a line?

The gas constant R = 8.314 J/mol*K

Where can you find the gas constant?

On the periodic table sheet

(For the graph of the line that relates to deltaH of vaporization)

What is this sample equation equal to?

-3741x + 16.72 = ...

ln (barometric pressure in mmHg)

Difference between monoprotic and diprotic acid?

Monoprotic acid: Has one H+ to donate

Diprotic acid: Has two H+'s to donate

What indicator did we use for every lab?

Phenolthephthalein

During a titration, what happens at equivalence point?"

Moles of H+ = Moles of OH-

What is molar mass?

The grams of a substance per mol

(g/mol)

MM of an acid lab

What substance was the titrant?

NaOH

MM of an acid lab

What color did the indicator turn during the titration?

PINK

What elements are in group 2?

Alkaline earth metals

What elements are in group 7?

The halogens

Halides

Chemical compunds that contain halogens

Are halide ions soluble in hexane?

NO

Are halide ions soluble in water?

Yes!

Are halogens soluble in water?

NO

Are halogens soluble in hexane?

Yes!

What is the electron difference between halogens and halides?

Halogens have one unpaired electron

Halides have no unpaired electrons

Specific Heat Capacity

Heat required to raise one gram of a substance by one degree celsius

Exothermic

Heat released

(negative sign)

Endothermic

Heat absorbed

(positive sign)

What is the relationship between the q of surrounding and the q of the system?

+q of surroundings = -q system

&

-q of surrounding = +qsystem

What is the relationship between q of rxn and the enthalpy of the reaction?

q rxn is EQUAL to the enthalpy of the rxn

** q rxn includes measurements from water and solid compunds **

deltaT

(final temperature - initial temperature)

What is the relationship between q water and q of the metal?

q metal = -q water

What is the relationship between q solution and delta H of solution?

q of solution EQUALS delta H of solution