What is the method of standard addition? If you are not told to add the amounts of Zn standard to the unknown sample as directed by the manual, how would you decide the amount of spikes to add?
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- What is the method of standard addition? If you are not told to add the amounts of Zn standard to the unknown sample as directed by the manual, how would you decide the amount of spikes to add?
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- 2- Make a comparison between brittle and ductile materials Brittle Materials Ductile materials'N Brz NaOH N- ●A) Determine the ionic formula of one Cr+6, 4 oxygen atoms (polyatomic ion with a charge of -8) and 2H+ ions. B) Find the molar mass of one mole of the compound in part A. C) The Michigan standard for the maximum permissible level of Cr+6 in ground water is 0.10 mg/L. You take 1.00 Liter of ground water and discover that there is 0.15 mg of Cr+6 present. Convert 0.15mg of Chromium (the +6 charge does NOT change the molar mass) to moles of Cr. D) How many formula units of H2CrO4 are in the number of moles of Cr+6 you calculated in part C? r
- You were tasked to separate the components of a mixture containing silica, sodium chloride and charcoal. TNāCI dissolves in water while silica and charcoal are not water-soluble. Only charcoal dissolves in carbon disulfide. a. Write a short experimental procedure to carry out the separation of the mixture. b. Given the following data, determine the percentage of charcoal, sodium chloride and silica. Mass (g) Mass of beaker 100.000 Mass of beaker + mixture 110.000 mass of evaporating dish 62.000 mass of evaporating dish + solid after evaporation of water 65.000 Mass of beaker + charcoal + silica after evaporation of excess water 117.000 mass of beaker + silica after decanting dissolved charcoal and drying 113.545You want to make a solution of the primary standard sodium oxalate. It has a molecular mass of 133.999 g/mol (no error). Your analytical balance has an error of 0.2 mg. You add some weighing paper to the balance and it reads a mass of 0.23626 g. You then add sodium oxalate onto the weighing paper until the mass registers as 2.8539 g. You carefully transfer this to a 250.0 ml volumetric flask with an error of 0.1 ml and dissolve the sodium oxalate in a sufficient volume of water. What is the concentration of the oxalic acid (in M) and what is the absolute error (also in M).A. REACTIONS OF HYDROCARBONS Three hydrocarbon samples were analyzed by various qualitative tests and the summary of their reactions is given in Table 1 below. Identify each unknown sample by matching the respective reaction profile with the given structures (A, B, or C). Table 1. Summary of Reactions of Hydrocarbon Samples Sample Br2 in CCl4 KMnO4 in NaOH AgNO3 in NH3 1 Fading of reddish-brown color Brown precipitates No reaction 2 Fading of reddish-brown color Brown precipitates Silver precipitates 3 Fading of reddish-brown color No reaction No reaction Sample Identity and Rationalization 1 2 3
- A solution of potassium permanganate of unknown concentration was analyzed against a standard of various concentrations. Refer to the following data set to answer the succeeding questions (MM KMnO4 = 158.034 g/mol). Table 1. Data for Standard Calibration Curve KMnO4 Standard (grams/Liter) Absorbance at 525 nm 0.008 0.10437 0.158 0.20197 0.316 0.45288 0.474 0.68232 0.632 0.89361 Table 2. Data for KMnO4 Solution of Unknown Conc. Sample of Unknown Conc. Absorbance at 525 nm Undiluted KMnO4 0.95423 Diluted KMnO4 (50% dilution) 0.46514 Which of the following linear equation for the standard calibration curve is generated fromTable 1? y= 0.03231x – 0.74923 y= 0.04848x + 1.3179 y= 1.3179x + 0.04845 y= 0.74923x – 0.032316. If you started with 7.25 bsh, how many bgt is equal to this?The reaction between methanol (CH³OH), and hydrobromic acid (HBr) forms bromoethane (CH³Br) and water (H₂0). Our reaction recipe calls for 1.3 molar equivalents of hydrobromic acid for every mole of methanol. a. What is the stoichiometric ratio of hydrobromic acid and bromoethane for the reaction as it occurs? b. If you run the reaction with 2.5 moles of methanol, how many moles of hydrobromic acid does our recipe call for? How many moles of hydrobromic acid would actually be used in the reaction?
- b) Identify the process/reaction and draw the chemical structure for each below.i. ethene to polyetheneii. hexane to benzeneiii. octane to paraffin and olefiniv. heptane to 2,2 – dimethylpentaneA. REACTIONS OF HYDROCARBONS Three hydrocarbon samples were analyzed by various qualitative tests and the summary of their reactions is given in Table 1 below. Identify each unknown sample by matching the respective reaction profile with the given structures (A, B, or C). Table 1. Summary of Reactions of Hydrocarbon Samples Sample Brz in CCI4 KMNO, in NaOH AGNO3 in NH3 Fading of reddish- brown color Brown precipitates 1 No reaction Fading of reddish- brown color Brown precipitates Silver precipitates 3 Fading of reddish- No reaction No reaction brown color H3C `CH3 H,C CH3 А Sample Identity and Rationalization 1You have a mixture of KCI, BaCO3, and SiO2, From the following, select the steps that would allow you to separate and isolate the KCI and SiO2 from the mixture. Step 1 A. Add a solution of 0.1 M AgNO3(aq), stir, and decant the supernatant Step 2 three times. Step 3 B. Heat the residual solid SiO2 to remove the water. C. Add a non-polar solvent, stir, and decant the supernatant three times. Evaporate the water from the combined supernatant. D. Add water, stir, and decant the supernatant three times. Evaporate the water from the combined supernatant. E. Heat the mixture to sublime one of the components. F. Add a solution of 1 M HCI, stir, and decant the supernatant three times.
