Draw a resonance structure of thiophene that has the same number of pi bonds as the original structure. Include all lone pairs in your structure. Es:

Why is a salt solution used in the preparation of soap?

Graph data with Concentration on the x-axis and Absorbance on the y-axis. Find the line of best fit for your data points. Record the respective formula in y=mx+b.

Perform calculations to determine the amount of 5.00x10-5 M stock solution needed to prepare 20.00 mL of 2.00x10-5 M dye solution. Perform calculations to determine the amount of 2.00x10-5 M dye solution needed to prepare 20.00 mL of 5.00x10-6 M dye solution. Perform calculations to determine the amount of 5.00x10-6 M dye solution needed to prepare 20.00 mL of 1.00x10-6 M dye solution. Show your calculations

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

Dissolution Distilled H20 Concentration 0.01 M HCI Concentration (mg/ml) Time Total amount A Total amount A (mg/ml) (mg) (mg) 5 0.16 0.1 10 0.24 0.18 15 0.35 0.25 20 0.48 0.34 25 0.58 0.4 30 0.67 0.5 1. Plot the given data on an ordinary paper and find the slope for each line then calculate the IDR constant for aspirin in the two dissolution media, water and HCI. NOTE: Slope of the calibration curve = 1.0 (mg/ml and saturation solubility of salicylic acid is equal to 2.0 gm/L.

Concentration of TZ stock solution (μMμM) 42.06