ASSIGNMENT
Question 1 (10 points)
Upload your picture of your Gas Collection Apparatus.
To receive credit, your ring stand, graduated cylinder, beaker, all tubing, flask, etc. The oxygen bubbles must be clearly visible in the picture, as well as clear label with your name, the lab title (with Experiment number), and the date in clear view. This must be a single picture.
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Question 2 (8 points)
Upload your picture of your completed Table 1: Temperature, Pressure, and Volume Data and Table 2: Reaction Time Data.
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Question 3 (8 points)
The goal for Experiment 1: Ideal Gas Law – Finding Percent H2O2 with Yeast is to find the percentage of hydrogen peroxide in the solution. To determine percentage, you need to first determine how many moles of hydrogen peroxide are present. Rearrange PV=nRT to solve for n, then plug in your known values for P, V, R, and T.
Show all your calculations from Experiment 1 for converting your temperature (T) to Kelvin.
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Question 4 (8 points)
The goal for Experiment 1: Ideal Gas Law – Finding Percent H2O2 with Yeast is to find the percentage of hydrogen peroxide in the solution. To determine percentage, you need to first determine how many moles of hydrogen peroxide are present. Rearrange PV=nRT to solve for n, then plug in your known values for P, V, R, and T.
Show your calculations from Experiment 1 for converting your pressure (P) to atm. (If you obtained the pressure originally in atm without converting, then convert atm to mmHg to demonstrate you know how to do this conversion.)
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Question 5 (8 points)
The goal for Experiment 1: Ideal Gas Law – Finding Percent H2O2 with Yeast is to find the percentage of hydrogen peroxide in the solution. To determine percentage, you need to first determine how many moles of hydrogen peroxide are present. Rearrange PV=nRT to solve for n, then plug in your known values for P, V, R, and T.
Show your calculations from Experiment 1 for converting your volume (V) from milliliters (mL) to liters (L).
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Question 6 (8 points)
The goal for Experiment 1: Ideal Gas Law – Finding Percent H2O2 with Yeast is to find the percentage of hydrogen peroxide in the solution. To determine percentage, you need to first determine how many moles of hydrogen peroxide are present. Rearrange PV=nRT to solve for n, then plug in your known values for P, V, R, and T.
Show your rearrangement of the ideal gas law equation from Experiment 1 to solve for n. Then plug in your P, V, R, and T values (using proper units) and solve.
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Question 7 (8 points)
Show your calculations from Experiment 1: Ideal Gas Law – Finding Percent H2O2 with Yeast for determining the theoretical number of moles of O2 if the hydrogen peroxide were a 100% solution.
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Question 8 (8 points)
Using the actual moles of O2 you determined from your experiment (n) and the theoretical moles of O2 you just calculated, show your calculations from Experiment 1: Ideal Gas Law – Finding Percent H2O2 with Yeast for determining the percent hydrogen peroxide in your experimental sample.
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Question 9 (8 points)
The bottle of hydrogen peroxide you used in Experiment 1: Ideal Gas Law – Finding Percent H2O2 is labeled as a 3% solution (the same as store-bought hydrogen peroxide). Do your experimental results support this (with consideration given to experimental error)? Show your calculations for your percent error of your results.
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Question 10 (10 points)
Upload your picture of your flask/balloon apparatus (Step 5). See Figure 5: Gas collection apparatus sample in the eScience procedure. To receive credit, your pot, water, flask, and inflated balloon must be clearly visible in the picture, as well as clear label with your name, the lab title (with Experiment number), and the date in clear view. This must be a single picture.
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Question 11 (8 points)
Upload your picture of your completed Table 3: Charles’ Law Part 1 Data (Step 6).
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Question 12 (8 points)
How does the molecular motion of the air particles explain your results in Experiment 2: Charles’ Law, Part 1? Note that the pressure on the surface of the balloon remained constant, at atmospheric pressure. Be as detailed as possible with your answer to receive full credit.
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