Noodle Brain

Optimization problem? Find the radius?

Calculus Problem: Find the radius of a can that will minimize its dimensions?

A large cylindrical oil can has a volume of 1000 cubic inches. Find the radius of the can that will minimize its dimensions.

I would assume dimensions means surface area?

Please show all steps and formulas used! :)

Find max/min values and inflection points?

f(x) = 2sinx + sin2x [0,2pie)

Find

a. maximum and minimum values

b. Inflection points

Please show all steps and formulas used! Thank you! :)

A large cylindrical oil can has a volume of 1000 cubic inches. Find the radius of the can that will minimize its dimensions.

Please show all steps and formulas used! :)

Find the critical values:

f(x) = sinx cosx

please show all steps and formulas used!

Water is flowing at the rate of 5 cubic feet per minute into a tank in the form of a cone of altitude 20 feet and base radius 20 feet and its vertex in a downward direction. How fast is the water level rising when the water is 8 feet deep?

please help! Show all steps and formulas used!

Two students were asked to carry out an acid and base reaction between CH3CCH and NaNH2. First the student mixed the two reagents in water and the reaction failed. However, the second student mixed the two reagents in hexanes ( CH3(CH2)4CH3, a common organic solvent) and the reaction worked. Provide a reasonable explanation as to why the first student's method failed?

I really have no idea -_- Please help! Thankyou!

A first order reaction has a half life of 245 minutes at 600k. What is the value for the rate constant for this reaction? How much time will it take for the concentration to drop to one tenth of its initial value?

Please show all work! :) Thankyou!

For the reaction 2A+B-->3C, it was found that the rate of disappearance of B was .30 ms-1. What was the rate of disappearance for A and appearance rate of C.

Pleaaaaaaase show all work! I have no idea how to do this.

How do you write the complete and net ionic equation for these reactions? i had to do a lab on these, but i'm not sure the ones I did are correct. Please help :(

1) Na2CO2 (Aq) + CaCl2 (aq) ---> ?

2) NaOH (aq) + CaCl2 (aq) --->?

3) Na2CO3 (aq) + H2SO4 (aq) --->?

4) H2s04 (aq) + NaOH (aq)-->?

5)H2S04(aq) + CaCl2 (aq)--->?

0.77 mg sample of nitrogen reacts with chlorine to form 6.61 mg of the chloride. What is the empirical formula of the nitrogen chloride?

Help, please. -____-

Combustion analysis produced 33.01 g CO2 and 13.51 g H20. Calculate the empirical formula of the hydrocarbon?

When iron rusts, solid iron reacts with gaseous oxygen To form solid Iron (III) oxide. What is the balanced equation for that?

Help :/ my lab professor refuses to help us on labs.

"You have been given a stock solution of 50ug/ml of compound x. You need to make a liter of 2.5 ug/ml of compound x. How would you do this. Show your work."

So far, I'm dying. -__- I'm not sure what to do here.

And one more! How do you know your standard curve is a good fit for a linear model?

I had a root canal, and they'd used a local anesthetic on me, so i couldn't feel half of my face for a several hours... unfortunately, during this time i made the mistake of chomping on my bottom lip, leaving it swollen, and bruised!

The swelling is gone, but now i'm left with some hideous black, bruiselike circle on my lip, and it sucks :( I've looked everywhere online for remedies, but majority of the people say just to keep it moisturized and keep icing... there HAS to be a better, and QUICKER, way :( Thanksgiving is coming up and don't want to be seen with this :( barf.

Use Hess’ Law to find the change in enthalpy for the following reaction:

3NO(g)  N2O(g) + NO2(g) ΔH = ?

Given:

1. 2NO(g) N2(g) + O2(g) ΔH = -180.7 kJ

2. 2NO2(g) 2NO(g) + O2(g) ΔH = 113.1 kJ

3. 2N2(g) + O2(g)  2N2O(g) ΔH = 163.2 kJ

I'm usually okay with Hess' law... I just can't seem to get rid of the O2's!!! They're driving me crazy. And i can't think of any fractions that'll get rid of it! :/ Help please

25 mL of 0.150 M NaOH and 25 mL of 0.150M HCl are placed in a calorimeter; both are initially at 24.0oC. After stirring, the final temperature is 34.2oC. Calculate qsolution, qreaction and ΔHreaction (in kJ/mol). Assume the density of the solution is 1.00 g/mL and the specific heat of the solution is 4.18 J/goC. Pay close attention to the signs of these values.

I. AM. SO. LOST.

This is my last resort, because all the chem professors refuse to help on pre-labs. :/

A sample of O2 occupies a volume of 346.0 mL at 745.5 torr and 25 C. What is the volume (L) would that the O2 occupy at STP ?

I. CAN'T. FIGURE. THIS. OUT.

:(

Oxygen gas is collected over water at 25.0 C. If the barometric pressure is 763.5 mmHg and the vapor pressure of water at this temperature is 23.8 torr, what is the pressure of the O2?

ahhh! please help me :( My professor refuses to help with these questions. and i've tried solving it numerous amounts of times.

Oxygen gas is collected over water at 25.0 C. If the barometric pressure is 763.5 mmHg and the vapor pressure of water at this temperature is 23.8 torr, what is the pressure of the O2?

ANDDDD

A sample of O2 occupies a volume of 346.0 mL at 745.5 torr and 25 C. What is the volume (L) would that the O2 occupy at STP ?

My lab professor refuses to help me :/ So i had to result to asking answers...

given the following redox equation:

2Cr^+3 + 6Fe^+3 + 7H2O ===> Cr2O7^2- + 6Fe^+2 + 14H^+

Assign oxidation numbers for all the elements in the reaction above.

Which element is being oxidized? ____

which element is being reduced? _____

please help me :( My chem labs are killing me :(

I have to write a paper on these, but i'm completely clueless on how to answer these questions. Can someone sum them up in like a sentence or two?! I just need to get the gist of it. Please answer the ones you can :)

A - Trace the emergence and development of Nationalism as a force of change in the nineteenth and twentieth centuries. Please include social, political, and military factors in your answer. Use at least 2 different primary sources of your choice to illustrate your stance.

B- How did Europe move from a revolutionary period focused on the individual liberties following the French Revolution to a period of ultra conservatism typified by fascism in the interwar period? Use at least 2 different primary sources of your choice to illustrate your stance.

C - How did ideology, knowledge, and the escalation of ideas lead to both positive and negative developments across the span of modern western civilization? Has society benefited or suffered from the expansion of “free thought” over the last 500 years. Be sure to address both sides of the argument and the entire span of the course.