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Dangerous Paint Stripper Jessica has a summer job working for the city parks program. She has been using a cleaner called “Graffiti Gone” to remove graffiti from the bathrooms. She has to take a lot of breaks, because the chemical makes her throat burn. It also makes her feel dizzy sometimes, especially when the bathrooms don’t have very many windows. On the label, she sees that the cleaner has methylene chloride in it. She feels like she’s managing to get the work done, but she is worried about feeling dizzy. She wants to find out more about this chemical, what harm it can cause, and whether there are safer ways to do this work. Questions for following story. 1. What went right in this situation? 2. What went wrong in this situation? 3. What steps should be taken in this workplace to make sure employees are better protected and prepared the next time?

Tom, an analytical chemist, bought a bag of decaffeinated coffee from a grocery store. However,Tom suspected that he might have received regular coffee and therefore decided to analyze hiscoffee for caffeine. In the lab, he took 0.5 mL of the brewed coffee and diluted it in water tomake a 100.0 mL solution. He performed four analyses and found the concentrations to be 4.69,3.99, 4.12, and 4.50 mg/L, respectively. (Assume the density of all solutions is 1.000 g/mL,1oz= 28.35 mL).(a) Report the concentration (in mg/L) of caffeine in the brewed coffee using the format asaverage ± standard deviation. (Note this is not the concentration in the diluted solution.)(b) Look up the caffeine content of regular vs. decaffeinated coffee. Do you think that Tom wasgiven the wrong type of coffee?(c) Caffeine intake of 300 mg per day reportedly has no adverse effects in the vast majority ofthe adult population. If Tom drinks 3 cups (8 oz/cup) of this coffee daily, is his intake withinthis known safe…

You are asked to perform a dilution of β-carotene. It has a molecular weight of 536.888 g/mol.   a Calculate the grams of β-carotene needed to create 100 mL of a stock solution with a concentration of 2.3*10-3 M. 
 
 
     b Calculate the mL needed from the above stock solution to create 100 mL of a solution with a concentration of 1.15*10-4 M.

2. A student performs the NaBH4 reduction of the triketone shown below (note that the equation is not properly balanced). She starts with 1.20 grams of ketone and 0.130 g of NaBH4 and isolates 0.720 g of product. Balance the equation and calculate the percent yield. Show your work. НО OH H Ph Ph NaBH4 Ph + Ph H H OH 1.20 g MW: 238.24 0.130 g MW: 37.83 0.720 g isolated MW: 244.29

1. The pka of caffeine is 14.0; water is 15.7; isopropyl alcohol is 17.0. Hand draw each of these molecules. Identify what functional groups are a part of each molecule and write the name of the functional group under each molecule. Look up the characteristic pKa for each functional group, the pKa of the compound, and indicate that in the picture as well. Circle or highlight the acidic hydrogen(s) that is related to the pka.

In Example 12, the crude petroleum had an overall octane rating of 52. What is the composition of a solution of MTBE and n-heptane that has this octane rating?

THIS CAN NOT BE HAND DRAWN!

Which of the following are hazards in this lab? Choose all that apply. Group of answer choices NaOH HCl NH3 acetic acid deionized water

This assignment is designed to help you learn how to determine total costs by combining direct and indirect costs for a particular department. In this GHA, you will be determining the total costs for three departments: (1) Physical Therapy (2) Occupational Therapy and (3) Speech Therapy. To determine the total costs, you will need to add the direct costs to the indirect costs using the template provided below. Please use the example provided in the assignment description if you find that you need some support understanding the required calculations. DIRECT COSTS The direct costs for each department are easily identifiable, because they are the costs that are directly attributable to the department. The direct costs are as follows: Physical Therapy (PT) Occupational Therapy (OT) Speech Therapy (ST) Total Direct Costs INDIRECT COSTS The indirect costs will need to be allocated to Physical Therapy (PT), Occupational Therapy (OT), and Speech Therapy (ST). The indirect costs in this…

The Ksp of magnesium hydroxide is 1.7x10-11. If 5.0 grams of the solid are placed into a flask containing 1.0 L of water, what will be the result? Group of answer choices None of it will dissolve. Much less than 1 g will dissolve and the pH of the solution will be below 4. All of it will dissolve. Approximately 1 g will dissolve and the pH of the solution will be below 2. Much less than 1 g will dissolve and the pH of the solution will be above 10. Approximately 1 g will dissolve and the pH of the solution will be above 12.

Which of the following substances is likely to have the largest pK,? Select an answer and submit. For keyboard navigation, use the up/down arrow keys to select an answer. Benzoic acid (K, = 6.3 x 105) Formic acid (Ka= 1.8 x 10) Nitrous acid (K=7.1x 10) Phenol (Ka = 1.0 x 10 1) Pyruvic acid (K= 2.8 x 10) e

Question: Calculate the percent of sodium hypochlorite in the original bleach bottle using your average result. Solution A Average titration volume dispensed: 41.19mL (N22S2O3 5H20) Actual Mass of Na2S203 5H2O : 6.811g Concentration of Na2S2O3 5H2O solution: 0.0549M

Consider propanoic (CH3CH2CH2CO2H) acid and pentanoic (CH3CH2CH2CH2CO2H) acid and the corresponding alcohols with the same number of carbons, propanol (CH3CH2CH2COH) and pentanol (CH3CH2CH2CH2COH). Select the class of compound that is more soluble. {one answer] Select the best explanation for your answer to the previous question. [a second answer] Group of answer choices a. The solubility of alcohols in water decreases with increasing chain length. b. Propanoic acid and pentanoic acid are more soluble in water than the corresponding alcohol. c. Carboxylic acids are generally more soluble in water than alcohols of the same chain length because of increased hydrogen bonding with the -COOH functional group.  d. Propanol and pentanol are more soluble in water than the corresponding carboxylic acid e. The solubility of carboxylic acids in water decreases with increasing chain length. f. Alcohols are generally more soluble in water than carboxylic acids of the same…

Now, on top of the structure of methyl amine (CH3NH₂) below, select the region where the partial positive charge (8+) would be located within the structure. Keyboard controls Add selection & I H H C-N. H H 8

Which diagram is the correct one?  What other procedure can be used to solve this problem? write down ways to solve.  first, execute plan 1 to solve the problem. Please explain every step.  Think about the way that you can use to make sure that your answer makes sense. write down your assessment.

1) Listen The Ksp value for calcium sulfate [CaSO4] is 2.40 X 10-5 and a professor made 1825 mL of a CaSO4(ag) solution but then one of his graduate student accidentally poured in a 0.125 M solution of calcium phosphate [Ca3(PO4)2] solution. You may ignore the additional volume coming from the Cag(PO4)2 solution to make the calculation simpler. Now that you have calculated the new equilibrium constant (K) with this common ion effect then which way will the chemical equilibrium shift? need more information to be determined at equilibrium chemical equilibrium will shift to the right first and then to the left chemical equilibrium will shift to the right chemical equilibrium will shift to the left 201591..docx LAB EXP. #3 -..docx Show All

Pls help ASAP on all PLS I REQUEST