6 Q on chemistry

Anonymous
timer Asked: Apr 26th, 2017

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6 question on chemistry I need good work on it to get all point.




UNIVERSITY OF THE DISTRICT OF COLUMBIA COLLEGE OF ARTS AND SCIENCES Division of Sciences and Mathematics CHEM 113-01 Experimental General Chemistry I Lab Exam-3 April 27, 2017 1. The first reaction in Experiment 6 (Chemical Reactions of Copper and Percent Yield) follows the following balanced equation: a. The remaining 4 reactions follow the following equations: Balance each of these: (2 points) b. Classify the above 4 reactions as to type(2 points) c. Based on the balanced equations of Question 1, if you used 85.0 mg of copper in the initial reaction, calculate the exact amount of zinc required to complete the reaction in equation D. (3 points) UNIVERSITY OF THE DISTRICT OF COLUMBIA COLLEGE OF ARTS AND SCIENCES Division of Sciences and Mathematics CHEM 113-01 Experimental General Chemistry I Lab Exam-3 April 27, 2017 2. In a chemistry lab, you work as a laboratory assistant. There is a missing label on one of the bottles, but you are not sure it is NaCl or NaI. Based on what you learnt in Experiment 7, design an experiment to find the missing information (Assume that we have all materials you need in the lab). Please give detailed step-by-step procedures to get full credits. (6 points) 3. Suppose that a 0.2045g Unknown sample is analyzed using the procedure for Experiment 8 (Gravimetric analysis of a chloride salt). If the initial filter paper weight is 0.4056g and the final filter paper weight is 0.8912g (with AgCl), what is the % Cl by mass of the Unknown sample? Show all work. MWAgCl = 143.32 g/mol; MWCl = 35.4527 g/mol. (6 points) UNIVERSITY OF THE DISTRICT OF COLUMBIA COLLEGE OF ARTS AND SCIENCES Division of Sciences and Mathematics CHEM 113-01 Experimental General Chemistry I Lab Exam-3 April 27, 2017 4. In a gravimetric analysis experiment, the following percentages of chloride were found: 42.52%, 42.14%, 42.61%, and 42.75%. Find the mean, the average deviation from the mean, the standard deviation from the mean, and the relative standard deviation from the mean. (6 points) 5. A student followed the procedure in this experiment in Experiment 28 (Heat of Neutralization), using 50.0 mL of 0.500 M HCl at 25.0°C and 50.0 mL of 0.500 M NaOH at 25.0°C in a coffee cup calorimeter, the temperature of the mixture rises to 28.2°C. What is the heat of reaction per mole of acid? Assume the mixture has a specific heat capacity of 4.18 J/(g·K), heat capacity of the coffee cup is 10.7 J/K and that the density of the reactant solution is 1.00 g/mL at the end of the reaction. (6 points) UNIVERSITY OF THE DISTRICT OF COLUMBIA COLLEGE OF ARTS AND SCIENCES Division of Sciences and Mathematics CHEM 113-01 Experimental General Chemistry I Lab Exam-3 April 27, 2017 6. Molecular modeling Project: Using appropriate materials in your house to build, in an creative way, the molecular model of the assigned compound*. Ideal central atoms may be a mall muffin, small cup cake or a piece of ball-shaped butter/cheese; toothpicks or any wood sticks may be used as bonds; white cotton balls, grapes or cutted small ball shaped fruits may be used for non center atoms; a toothpick with no ball attached on the end can be used to stand for a non bonding electron pair. Molecular Formula Assigned molecule for you* Lewis structure (1 point) Hybridization of central atoms (1 point) Molecular Geometry (1 point) Dipole Moments (yes or no) (1 point) Paste Your Model here Models you made using your creative materials in your house (Attention: Once you finish your beautiful model, take a picture of the model with your smart phone. If you have a printer with you, print the picture and paste the picture of your model here; if you don’t have a printer home, just send me the picture together with your work ) (10 points) *Work on SF4 if intial of your last name is from A to G; Work on XeF4 if intial of your last name is from H to N; Work on BrF3 if intial of your last name is from H to N.

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