1. Which piece of equipment would be BEST to measure 5 mL of a liquid?
a) A disposable dropper
b) A 50 mL Beaker filled halfway between the 0 and 10 mL markings
c) A 100 mL Graduated cylinder
d) A 50 mL Erlenmeyer flask filled halfway between the 0 and 10 mL markings
e) A 10 ml Graduated cylinder
2. What is the BEST numerical value for the quantity of liquid shown below?
a) 6.5 mL
b) 7.5 mL
c) 6 mL
d) 6.2 mL
e) 6.25 mL
3. Which of the following would NOT be considered a valid Sources of Error?
I: Calculation errors II: Contamination III: Using the wrong solution for a reaction
a) I only b) II only c) III only d) both I & II e) both I & III
4) Which of the following is considered a safety precaution that should be followed?
I: Wearing goggles II: Reading the Lab procedure before class III: Having proper ventilation in the Lab
a) only I b) only II c) Only III d) I & III e) ALL should be followed
5) If you take too much of a certain chemical, what should be done with the extra amount?
a) Carefully return the extra amount to the original container so that nothing is wasted.
b) Carefully dump the chemical down the sink with plenty of water.
c) Dispose of the chemical in a proper, clearly labelled waste container.
6) Which is TRUE if a solution has a Yellow color? (R = Red, G = Green, B = Blue)
a) It will absorb R and B light, and transmit G light. d) It will absorb G light, and transmit B and R light.
b) It will absorb R light, and transmit G and B light. e) It will absorb G and R light, and transmit B light.
c) It will absorb B light, and transmit G and R light.
7) Which of the following is TRUE concerning Column Chromatography?
The first chemical to come out of the column interacts the most with the stationary phase.
The first chemical to come out interacts the least with the stationary phase.
c) There is no interaction between the chemical and the stationary phase.
8) Why did the clear acid solution become blue over time in the experiment “The Chemistry of Metal Reactivity and Acid Etching”?
a) The color change was due to the formation of the soluble salt, Cu(NO3)2.
b) The color change was due to the presence of a gas that was formed.
c) The color change was due to the oxidation of the acid.
9) Which one of the following shows a Thin Layer Chromatography (TLC) set up?
I. II. III
a) I only b) II only c) III only d) both I & II e) None
For items 10 through 13, name each piece of laboratory equipment using choices (a) – (d) below.
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Crucible tongs b) Spatula c) Hot plate d) Top-loading balance
For items 14 through 17, name each piece of laboratory equipment using choices (a) – (d) below.
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Test tubes b) Beakers c) Funnel d) Graduated cylinder
18. Which piece of equipment would you use to measure 4.0 grams of solid zinc sulfate?
a) Balance b) Graduated cylinder c) Beaker d) Erlenmeyer flask
19. In the experiment “The Chemistry of Metal Reactivity and Acid Etching,” which of the following was used to protect the copper plate during the chemical etching process?
a) Asphaltum resist b) Paraffin wax c) Nitric Acid d) Hydrogen gas
20) The Visible Absorption Spectroscopy lab tested Beer-Lambert’s Law. Which one of the following statements describes the Beer-Lambert Law?
a) As the concentration of a solution increases, the absorbance of light by the solution increases.
b) As the concentration of a solution increases, the absorbance of light by the solution decreases.
c) As the color of a solution darkens, the absorbance of light by the solution decreases.
21) In the experiment “Dyeing with Indigo,” which process is responsible for the cloth changing color from yellow to blue when the cloth was removed from the vat and allowed to dry?
a) Hydration b) Reduction c) Etching d) Oxidation
22) Which piece(s) of equipment did you use to separate the solid pigment from the reaction mixture in the “Synthesis of Pigments: Chrome Yellow and Prussian Blue” lab?
a) Funnel and filter paper b) Funnel and weighing paper c) Centrifuge d) Hot plate
23) In the synthesis of Prussian blue (potassium ferric ferrocyanide) paint, which compound was mixed with the synthesized pigment?
a) Calcium b) Calcium carbonate c) Oxygen d) Nitric acid
24) In the “Chemistry of Photography” lab, what would happen if the photographic paper were not allowed to dry properly before placing the negative on it and exposing it to the light?
a) There would be no chemical reactio.
b) The solution mixture would stick to the negative and the image would not be transferred to the paper.
c) The solution mixture would dissolve the negative.
d) The image would transfer to the paper, but it will be darkened.
25) In the “Alloys: The Copper, ‘Silver’ and ‘Gold’ Penny Experiment,” the color of a penny changes to silver when it’s dropped into a hot solution of NaOH and zinc powder. What is the reason for the color change?
a) The NaOH/Zn combination pulls the brown color off the penny.
b) The copper and zinc atoms formed an alloy called, “brass.”
c) The penny gets a coating of zinc metal (the penny is “zinc plated”).
d) The copper and zinc atoms merge to become silver atoms.
