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We have already noted two sources of systematic error in the use of this method: not enough sample to displace all the air from the flask and the finite vapor pressure of the unknown. Consider the following possible errors. For each one, describe how the results might be impacted. Please try to be specific (e.g. “The molar mass will be overestimated because…”) The volume of your flask was found by weighing it, filled with water, at room temperature (20ºC).  At 100ºC, because of the expansion of glass, the volume is slightly greater.  How could this affect your results?  We have assumed that the temperature of the vapor is the same as the temperature of the boiling water. What if this were not correct? What could be the impact if some of the vapor leaks before all of it can be condensed?

The following data was collected in a lab where a 1000 uF capacitor was discharged using a 3 volt power supply. The capacitor was in series with a resistor of unknown value. a. Draw an RC circuit diagram where a capacitor can be charged and discharged in the same circuit using asingle pole double throw switch.b. Construct a graph of showing the discharge curve of the capacitor’s voltage with time using the databelow.c. Linearize the data below to construct a straight line with a constant slope.d. The graphs should be labeled and titled. The axes should be labeled with appropriate units.e. Using the the linearized data calculate the time constant for the RC circuit.f. Calculate the value of the unknown resistor.g. Show that the capacitor is nearly discharged after 5 time constants.

Please provide Handwritten answer. 9. After following all the steps in the photolithography, a student found that all the photoresist (the exposed and unexposed photoresist) on the silicon wafer was washed away during the development step. This is due to... * A) the student used longer exposure time during alignment and exposure step B) the student used slower spin speed during spin coating producing thicker photoresists C) the student used longer development time during the development step D) the student used lower temperature and shorter baking time during the pre bake step E) the student misaligned the mask with the wafer during the alignment step 10. After photolithography process the wafer will go to the either etching process or doping process such as ion implantation and diffusion. * True or False

None

The figure to the right illustrates the market for coffee in Colombia. Suppose the demand for coffee in Colombia is DColombia and the supply in Colombia is Scolombia: The world price of coffee with free trade is Pw 1.) Using the point drawing tool, indicate the quantity of coffee demanded at the world price (Q) in Colombia and the quantity of coffee supplied at the world price (QS) in Colombia. Properly label each point 2.) Using the point drawing tool, indicate the domestic market equilibrium price and quantity for coffee in Colombia if trade were completely eliminated. Label the point 'E' Carefully follow the instructions above, and only draw the required objects. PW Price per pound Quantity (Pounds of Coffee) SColombia Peolombia

Which statement(s) is/are NOT true for an ion-selective electrode with an organic polymer membrane specific to aqueous ions? I. Two reference electrodes on either side of the organic polymer membrane of the ion- selective electrode measure the potential difference across the membrane. II. The organic polymer membrane of the ion-selective electrode separates the inner solution from the outer analyte solution. III. The organic polymer membrane of the ion-selective electrode is hydrophobic and is impregnated with a viscous organic solution containing an ion exchanger and sometimes a ligand specific for the analyte ion. IV. The potential difference across the organic polymer membrane of the ion-selective electrode occurs when the analyte ions embedded in the membrane diffuse into the inner aqueous solution, creating a junction potential. V. The potential difference across the organic polymer membrane of the ion-selective electrode is dependent only on the activity of analyte ion in the…

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