Honors Chemistry – Essay Portion Final Exam Review

mmmmmName:____________________________________ Mods:_____________________

Stoichiometry

1a. Write the balanced equation for the combustion of butane.

b. What is the maximum amount of water that can be made when 8.5 Liters of oxygen and 15.5

Liters of butane react at STP ? What is the limiting reactant?

c. How much of the excess reactant is left over?

Honors Chemistry – Essay Portion Final Exam Review

Acid Base

2a. Write the balanced equation for the neutralization reaction between hydrochloric acid and

sodium hydroxide

2b. What is the molarity of the base using the data listed below:

MA = .750 M MB =

VA = 15.5 mL VB = 8.3 mL

2c. How many grams of sodium hydroxide were needed to make 1.5 L of the above solution?

2d. What color would the indicators be in acidic solution?

Phenolphthalein _______________________________

Bromothymol Blue _______________________________

Red litmus paper _______________________________

Blue litmus paper _______________________________

Number on pH paper _______________________________

Honors Chemistry – Essay Portion Final Exam Review

Gas Laws and empirical formula

3a. A compound has the empirical formula CHCl. A 256 mL flask, at 373 K and 750 torr, contains

0.800 grams of the gaseous compound. Determine the molar mass of the gas.

3b. Determine the molecular formula

3c. The enthalpy of combustion of this gas is found to be -1850 kJ/mol. If 25.0 grams of this gas were

burned in air, how much heat would be released

3d. Draw an enthalpy diagram for the combustion of 1 mole of this substance. Be sure to label the

location of the reactants, products, x axis, y axis and enthalpy change.

Honors Chemistry – Essay Portion Final Exam Review

4. Draw the voltaic cell for the reaction between the reactions listed below.

Be sure to label and include:

Cathode

Anode

Salt bridge

Wire

Aqueous solutions involved

Voltage of cell

Direction of electron flow

Which electrode is gaining mass

Which electrode is losing mass

Which solution is increasing in concentration

Which solution is decreasing in concentration

Al+3 + 3e- Al -1.66 V

Ag+ + 1e- Ag +0.80 V

Honors Chemistry – Essay Portion Final Exam Review

5. Write the complete balanced chemical equations for the reactants and products for any FIVE of

the laboratory situations below. If you answer more than five questions, only the first five

answered will be graded. In all cases, a reaction occurs. Be sure to includes states of matter in

your reactions. (3 points per reaction)

a) Nitric acid is added to calcium carbonate

b) Propane gas undergoes combustion with oxygen gas

c) silver metal is mixed with hydrochloric acid

d) Solutions of calcium nitrate and potassium sulfate are mixed

e) A solution of Hydrochloric acid is added to a solution of sodium hydroxide

f) Solutions of silver nitrate and sodium chloride are combined

Honors Chemistry – Essay Portion Final Exam Review

6. A solution is prepared by mixing 85.67 grams of potassium iodide in 2.25 liters of water. The density

of water is 1 g/mL.

a) Determine the molality of this solution.

b) The Kf for water is 1.86 J/goC. Calculate the new freezing point of the potassium iodide solution.

c) Would the freezing point be different if the same molality of sodium chloride was used?