Lab Question?????

Reactants: 4.00g 2- pentanol, 7.00g NaBr, 5ml 9M H2SO4 (cant use more than 4 or 3 g of 2-pentanol or change reactants)        Want Product: 2-bromopentane

What procedure in the lab would you do to create from reactants and isolate 2-bromopentane from left over 2-pentanol, NaBr, H2SO4, and water?

I have:

1. Combine Reagants (NaBr is in excess) and reflux for 30 minutes. Problem: NaBr did not dissolve.

2. To get rid of NaBr that did not dissolve, I gravity filtrated (liquid formed a solid at the bottom?). I took only the liquid without solid that formed (liquid was transferred out carefully) and washed with 15 mL DI water. (aqueous layer on top and organic on the bottom which was cloudy?)

3. I then washed the organic layer with NaHCO3 twice with 10 ml portions. (aqueous layer on top and organic on bottom)

4. I had very little liquid from the organic layer. I dried with sodium sulfate to get rid of H2O.

5. I had very little product yield at the end and am not sure it's the product. (only like a milliliter of product)

6. I did not distill since I didn't have enough product.

What changes can I make to my procedure to increase product yield? What did I do wrong in my procedure? How can I get my product, 2-bromopentane, in high yield?

A mass of 3kg hangs from a pulley (I=3/4 MR^(2), M=5kg, R=0.5m) as shown. What is the tension in the cable?

What is the acceleration and final velocity when h=1.5m?

Find the intervals where the graph of f(x)=2x^4-3x^2 is increasing, decreasing, concave up and concave down. Find any inflection points, local maxima, or local minima. If none exist, write NONE. You must do number line sign charts to receive any credit.

Find the equation of the osculating circle at the local minimum of

f(x)=4x^3−9x^2+(15/4)x−7.

You should use NO MORE THAN 100 mL 0.25 M NH4OH, 4 g Ca(NO3)2· 4H2O, and/or 3 g (NH4)2HPO4. NOTE: This is not a stoichiometric recipe. Part of the grading for this lab will be based on your ability to determine appropriate quantities of each reactant. Clearly show the actual amount of each reactant you intend to use. Determine the mass or volume of each reactant in the proper stoichiometric ratio, to synthesize and analyze a sample of calcium hydroxyapatite. The unbalanced equation for the reaction is: H3O+(aq) + Ca(NO3)2(s) + (NH4)2HPO4(s) + NH3(aq) --> Ca10(PO4)6(OH)2(s) + NH4NO3(aq)

f(x)=x^4-24x^2
Determine the intervals of increase and decrease for f (x)
Use the First Derivative Test to find all local maxima and minima for f (x) .

Determine the intervals where f (x) is concave up and concave down

Find any inflection points of f (x) .

Please show the work

Solve the differential equation.
y''-3y'-4y=5e^4x

initial conditions:
y(0)=2
y'(0)=4

(1) Using the above table, data set has information on the account balances of customers at a bank’s four locations. Using that data set and an ? of 0.05, test the null hypothesis that the mean account balances are equal in the four towns using a one-way ANOVA in Excel?. Please provide a picture of the excel spreadsheet with the ANOVA Test results.

(2) Do you reject the null hypothesis or not? Indicate on which part of the Excel output you base your decision.

(3) Assuming that an acquaintance of yours has never heard of ANOVA, explain to him what the decision in part (b), i.e., “rejecting H₀” or “not rejecting H₀” means in this context at a level that can be understood by a high school senior.