Midterm 2 Version B
Chem 107C Spring 2013
Please read the problems carefully and box in your final answers in the form (units, significant figures, etc.)
specified in the problem. Be sure to show all of your work inclu
Chapter 13 Homework: Acids and Bases
Which of the following is not an attribute of an acid?
nonelectrolyte. C. It tastes sour.
with active metals.
a strong acid.
The substance HCl(aq) is:
acid nor a base.
The substance NaOH(aq) i
Chapter 10 Homework: The Liquid and Solid States
Three phases of water are shown in the figure. List the terms used to identify the phase changes indicated by the arrows.
A = sublimation, B = vaporization, C = f
Quiz 6 Study Guide
Le Chatelier's Principle
Match the change to the equilibrium system below with the letter of the appropriate response.
Write the letter of the correct answer next to the question. Each letter can be used once, more than once,
Chapter 11 Homework Packet
Which of the following substances is a strong electrolyte?
Which of the following substances is a nonelectrolyte?
What ions, atoms, or molecules are present after CH3CH2OH(l) mixes with water?
Chapter 09 Homework: The Gaseous state
Which of the following is not a property of gases?
Gases are compressible.
Gases expand to fill their
containers. C. The density of a gas is similar to that of a liquid. D. Gas particles move abou
Standardization of Thiosulfate
Objectives: Through this experiment, students will have experience the standardization of a
sodium thiosulfate solution and stoichiometric calculations.
Method: Sodium thiosulfate is not a primar
Synthesis of Copper (II) Glycinate
Objective: Through this experiment, students will experience the techniques of chemical
synthesis, determining percent yield, and developing the concepts of geometric isomerisms.
Method: In t
Objective: Through this experiment, students will learn the application of reduction potentials
and the observation of oxidation-reduction reactions.
Method: Through inspection, an element that undergoes an increase i
1. Unknown vinegar number:
2. Mass of Flask:
a. flask 1:
b. flask 2:
c. flask 3:
3. Mass of flask + Vinegar
a. Flask 1:
b. Flask 2:
c. Flask 3:
4. Mass of Vinegar
a. Trial 1:
Objective: Through this experiment, students will learn the qualitative observation of complexes
and do calculations involving the equilibrium constants for complex formation, acid dissociation
and solubility. They w
2. The mixture of all cations had to be separated by their ions in each group and it needed to
be centrifuge to remove the solid from the ions that remain in the solution. By removing
the cations, the mixture should be left with Na+ based o
1. Mass of flask + KHT
2. Mass of flask
3. Mass of KHT
Rates and Mechanisms of Reactions Visual and/or
Objective: Students will understand the usage of catalysts, the varying concentration amounts,
and the effects of temperature on reactio
Objective: Through this experiment, students will experience the preparation of a galvanic cell,
the determination of Avogadros number, and electroplating.
Method: To prepare the battery for this experiment, two hal
Results: (exp 28)
1. Mass of copper (II) acetate monohydrate
2. Formula mass of copper (II) acetate monohydrate
3. Moles of copper (II) acetate monohydrate
4. Mass of glycine
5. Formula mass of glycine
1. Sodium Sulfate dispersed due to water being evaporated. When oxygen was introduced,
the initially clumped solution became dispersed like powder. Na2SO4 * 10H2O (s)
Na2SO4(s) + 10H2O(l)
2. Potassium acetate produced water and it became a
Results and Calculations
Part A: Meniscus
1. The meniscus is a crescent shape curve that is seen at the top of the liquid in response to
the container. In this experiment, it was concave up due to the liquid being attracted to
the glass of the graduated c
Equilbrium Determination of Keq
Objective: Students will learn the uses of technique of absorption spectroscopy, the
determination of the equilibrium constant at different temperatures, and the determination of
2. Cell potential
Mass of Copper
Mass of copper
Initial current reading
Final current reading
Time for run in
Final mass of anode
Final mass of cathode
Mass loss o
1. 3CaCl2 (aq)+ 2 Na3PO4 (aq)= Ca3(PO4)2(s) + 6NaCl (aq)
White precipitation was developed, DR.
2. CuSO4(s) + 5H2O (l)= Cu(OH)2 * H2SO4(s)
No reaction, CA.
3. Cu(OH)2(s) = CuO(s) + H2O(g)
Gas formed at the top, copper turned black.
1. Balanced: MCO3(aq) + 2HCl(aq) MCl2(aq) +H2CO3 (aq)
Net Ionic: CO32-(aq) + 2H+(aq) H2O(l) + CO2(g)
a. Unknown number
b. Molarity of HCl solution (trial 1)
Molarity of HCl solution (trials 2 and 3)
Analysis of Bleach and Copper (II) Glycinate
Objective: Upon completion of these experiments, students will experience iodometric
techniques in quantitative analysis and stoichiometric calculations involving solutions.
1. Mass of weighed filter paper:
2. Mass of filter paper with Recrystallized vanillin:
3. Mass of Recrystallized Vanillin:
4. Mass of Impure Vanillin:
5. Percent recovery: (1.875g)/(2.114g) x 100
6. To i