• Interpolation

To find the volume associated with a pressure of 150 atm., you must __________________?

Chemical Measurements

• Density

A piece of gold ingot with a mass of 301g has a volume of 15.6 cubic cm.  Calculate the density of gold.

• Precision

How precise is the density the following measurements?

• Accuracy

What is the accuracy of the following measurements?

Substance   Literary      Experimental

Ethanol              0.798 g/mL                    0.802 g/mL
Gold                 0.864 g                          0.837 g

Chemical Activity/Reactions

• Balance this reaction; find the total and net ionic equations (remember states matter)
  

• Physical properties of all substances used

Determination of Empirical Formula

• Molar ratio

What is the mole ratio of a compound with the following composition: 40.1% C, 6.6% H, 53.3% O?  What is its empirical formula?

• Empirical to molecular formula

The molar mass of caffeine is 194.19 g.  Is the molecular formula of caffeine C₄H₅N₂O or C₈H₁₀N₄O₂?

Gas Laws

• Determination of molecular weight
  

• Determination of partial pressure

The temperature of the last system was 32 degrees celsius, and it was contained in a volume of 20mL where there is a known vapor pressure of 1 atm.  What is the pressure associates with this unknown?

• Determination of uncertainty

If the readings could be read to the following precision, what is the uncertainty associated with this partial pressure calculation?
P=±.1atm          V=±.01mL         m=±.0001g        T=±.1K

Atomic Spectra

• Order of light by wavelength

Determine the energy associated with a wavelength of 300nm.

If an electron travels from its ground state (n=1) to the 3rd transition state, and back, what is the energy of the photon it emits?

Thermochemistry

• Determination of heat of reaction

100mL of 0.500M HCl is mixed with 100mL of 0.500M NaOH in a constant-pressure calorimeter that has a heat capacity of 335 J/K.  The initial temperature of the total solution is 300K and the final temperature is 360K.  Calculate the heat of reaction, heat of neutralization, and molar heat of neutralization.  Assume that the densities and specific heats of the solutions are the same as for water.

• Calculate the final temperature

A quantity of 200mL of 0.862M HCl is mixed with 200mL of 0.431M Ba(OH)₂ in a constant pressure calorimeter that has a heat capacity of 453 J/K.  The initial temperature of the solutions are the same at 20.48 degrees celsius.  The process of straight acid + base gives water has a heat of neutralization of –56.2 kJ.  What is the final temperature of the mixed solution?

Determination of Iron in Cereal

• Concentration from absorbance

If you are taking measurements of absorbance using a 2mm diameter cuvette, and the reading for a 10M substance is 10% T, what is the molar absorptivity?

• Diluting samples

If you have 30mL of a 10M sulfuric acid, how would you dilute it down to 2M sulfuric acid?