In a Millikan oil-drop experiment, the charges on several different oil drops were as follows: -5.92; -4.44; -2.96; -8.88. The units are arbitrary. What is the likely value of the electronic charge in these arbitrary units?

i need a good introduction for a lab report about (isolation of caffeine from No-Doz tablets) . i am really not good at writing introduction and councluion.

for introduction i only wrote ( The purpose of this experiment was to extract the caffeine from a No-Doz tablets by recrystallizing it.) please help!!

What is Plank’s constant and the significance of this constant? A ray having an energy of 12 eV is required to create an electrical current in a circuit when the ray is shone on a piece of metal in the circuit. Determine the frequency of this ray. What is this called and what major revelation resulted from this type of experiment

When 6.597 grams of a hydrocarbon, CxHy, were burned in a combustion analysis apparatus, 21.74 grams of CO2 and 5.935 grams of H2O were produced. In a separate experiment, the molar mass of the compound was found to be 40.06 g/mol. Determine the empirical formula and the molecular formula of the hydrocarbon.

how can gel electrophoresis be used to determine whether a ligation experiment was successful? Be specific with what you would expect to see in the various lanes of the gel if a ladder, comtrol ( digested plasmid + insert without ligase) and sample ( digested plasmid + insert with ligase) were run.

1. A double blind, randomly allocated medical experiment is comparing two possible treatments for an immune-system disorder. Patients are randomly assigned treatments.

1. Show that Treatment B has the better response rate.

There is an experiment that demonstrates the first law of thermodynamics by using a tin can. The problem is I don't understand why there is a work done. The link to that video is https://youtu.be/jNPUCmkKiE4?list=WL&t=180 . Can someone explain to me why the tin can suddenly imploded?

When John Tyndall attempted to repeat Louis Pasteur’s experiment using the flask shown below, he found that microbial growth sometimes occurred even when the growth medium was boiled for an extended time. Explain why he obtained results that conflicted with Pasteur’s results.

In Part B of the experiment you uses a weak base, sodium bicarbonate to completely convert a weak acid to a salt. Why was sodium bicarbonate able to completely convert the acid whereas many weak bases would have left some unreacted acid because of the equilibrium?

In an experiment similar to this one, and done very carefully so that the yield was essentially 100%, 0.05 g of iron reacted with hydrochloric acid to give 0.145 g of a chloride FeCln. There are two chlorides of iron, ferrous chloride, FeCl2, and ferric chloride, FeCl3. Which one was obtained?