Draw a structural formula for the more stable carbocation intermediate formed in the reaction shown. H3C- H3C ● + HI • You do not have to consider stereochemistry. • Do not include anionic counter-ions, e.g., I, in your answer. • For cases in which carbocations of the same or similar stability are expected, draw all of the structures. ● Draw one structure per sketcher. Add additional sketchers using the drop-down menu in the bottom right corner. Separate structures with + signs from the drop-down menu.

Describe the steps involved in recrystallization.

Give the name of material which is used for water purification.

Suppose you measure a volume of 9.0 mL and a mass of 7.04 g for your first distillate. What is the density of the liquid? Group of answer choices 0.78 g/mL 0.782 g/mL 1.28 g/mL 1.3 g/mL

A student was given a stock ascorbic acid solution of 2.323 mg/L. Following the directions in the lab, the student obtained the data below. Calculate the concentration of ascorbic acid in the Standard (in microgram/L, ug -). Report your answer with one place after the decimal. initial final initial volume final volume volume volume color reagent color reagent stock stock solution solution solution solution Standard 1.35 mL 6.64 mL 5.12 mL 9.32 mL

Concentration of TZ stock solution (μMμM) 42.06

Most of us have had a glass of water from a Brita® pitcher. What is inside of a Brita® filter cartridge and what does it filter out? What doesn’t it filter out?

Which method(s) for determining concentration is/are valid? Calculating from a dilution Calculating from mass and volume data Calculating from absorbance data using Beer's Law All of the above

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