Thursday

February 23, 2017
Total # Posts: 1,828

**chemistry**

use resonance theory to account for the fact that aniline(pKb 9.37) is a weaker base than cyclohexanamine(pKb 3.34)

*April 25, 2010*

**Chemistry**

1)Write the general equation used to determine the volume of stock required to make a given concentration of standard? Define any terms you used. ----use the 100ml flasks to create four serial dilutions of the stock 10,000uM nitrate solution that has been provided. Prepare ...

*April 23, 2010*

**chemical oceanography**

Avg PO4^3- []'s in the deep and surface ocn's are 2.11 and 0.71umolkg^-1. Calc the residence time of PO4^3- in the deep ocn considering the carbon budget(Figure below) Write the general equation, calculation and units. ------ represents a Box outline Surface...

*April 23, 2010*

**chem 1p1**

An automobile tire at 22oC with an internal volume of 20.0L is filled with air to a total pressure of 30. psi(pounds per square inch). [1 atm = 14.696 lb/in2]. What is the amount in moles of air in the tire? If the air is mostly nitrogen, how many grams of it would be in the ...

*April 23, 2010*

**Chemical Oceanography**

Avg PO4^3- []'s in the deep and surface ocn's are 2.11 and 0.71umolkg^-1. Calc the residence time of PO4^3- in the deep ocn considering the carbon budget(Figure below) Write the general equation, calculation and units. ------ represents a Box outline Surface...

*April 22, 2010*

**Chemical Oceanography**

Avg PO4^3- []'s in the deep and surface ocn's are 2.11 and 0.71umolkg^-1. Calc the residence time of PO4^3- in the deep ocn considering the carbon budget(Figure below) Write the general equation, calculation and units. ------ represents a Box outline Surface...

*April 22, 2010*

**chemistry**

write the two half-reactions for the reduction of nitrate to nitrite using Cd2+

*April 22, 2010*

**home economics**

okay so i have these 4 questions that i have no clue about...i asked my mom and aunts but they don't make clothes so im stuck on these 4 question i would appreciate if you could please help me 7. You're sewing a child's nylon jacket. You notice the fabric frays ...

*April 20, 2010*

**college**

The first class in a relative frequency table is 50–59 and the corresponding relative frequency is 0.2. What does the 0.2 value indicate?

*April 11, 2010*

**statistics**

The first class in a relative frequency table is 50–59 and the corresponding relative frequency is 0.2. What does the 0.2 value indicate?

*April 8, 2010*

**college chem**

how many mL of .100 M of acetic acid and .100 M of NaOH, would be need to make the volume 1.0 liters and have a pH7.00 if Ka=1.8x10^-5 please write out the eq for me

*April 7, 2010*

**physcis**

THIS WEBSITE IS SO SLOW. NO ONE EVER ANSWERS.

*April 6, 2010*

**English lit**

Have writers block. Need help with Julia Alvarez poem!? I have to write a 1000 word analysis of the Julia Alvarez poem "Ironing Their Clothes". I need help with a thesis. I have no idea what to write about! 1 year ago Additional Details With a hot glide up, then down...

*April 1, 2010*

**chemistry-please someone answer...i am clueless**

When a monoprotic weak acid is titrated with a strong base, the titration curve contains these many inflection points: a.zero b.one c.two d.three Can you also explain why you choose your answer to this question...thanks

*March 25, 2010*

**chemistry**

When a monoprotic weak acid is titrated with a strong base, the titration curve contains these many inflection points: a.zero b.one c.two d.three Can you also explain why you choose your answer to this question...thanks

*March 25, 2010*

**analytical chemistry**

When a monoprotic weak acid is titrated with a strong base, the titration curve contains these many inflection points: a.zero b.one c.two d.three Can you also explain why you choose your answer to this question...thanks

*March 24, 2010*

**college chem**

can you elaborate a little more on how to so it

*March 24, 2010*

**college chem**

how many mL of .100 M of acetic acid and .100 M of NaOH, would be need to make the volume 1.0 liters and have a pH7.00 if Ka=1.8x10^-5? can someone please help me with steps to get the answer

*March 24, 2010*

**college chem**

what are the numbers for Conjugate acid and conjugate base

*March 23, 2010*

**college chem**

how did u get that can you please explain the steps

*March 23, 2010*

**college chem**

how many mL of .100 M of acetic acid and .100 M of NaOH, would be need to make the volume 1.0 liters and have a pH7.00 if Ka=1.8x10^-5

*March 23, 2010*

**math**

Thank you the site was very helpful.

*March 23, 2010*

**math**

I really don't understand this question and I can't seem to be able to solve it. Can anyone help me? Write a composite number between 7 and 20.

*March 23, 2010*

**chemistry**

A certain reaction has a delta H= -75 kJ and an activation energy of 40 kJ. A catalyst is found that lowers the Activation energy of the forward reaction by 15 kJ. What is the activation energy of the reverse reaction in the presence of this same catalyst?

*March 22, 2010*

**Chemistry**

Could someone tell me how I would write out trimethylammonium butanoate's structure? I think the butanoate part is CH3CH2CH2-C=O but I don't know how to add the trimethylammonium part to it.

*March 20, 2010*

**trig**

how do i find the amplitude, period, phase shift of y=2 cos(-4t-(-4 pi/3))

*March 18, 2010*

**chemistry**

1.5 x 10(10) mL

*March 11, 2010*

**windows XP**

On a shared folder, Read permission allows a user to display folder names, filenames, file data, and attributes; run program files; and change folders within the shared folder. True or false?

*March 11, 2010*

**computer science**

a bank charges $10 per month plus the following check fees for a commercial checking account: $.10 each for fewer than 20 checks $.08 each for 20-39 checks $.06 each for 40-59 checks &.04 each for 60 or more checks write a program that asks for the number of checks written ...

*March 10, 2010*

**computer science**

write a program that asks for the starting time and minutes of the call, and displays the charges. the program should ask for the time to be entered as a floating-point number in the form HH.MM. for example, 07:00 hours will be entered as 07.00, and 16:28 hours will be entered...

*March 10, 2010*

**college chem**

. Jack Daniels Tennessee whiskey is 40.00% ethanol by volume. However, % alcohol by mass is quite different from % by volume. The molality of ethanol in an aqueous solution that is 40.00 % ethanol by volume is 10.88 molal. A) Find the % ethanol by MASS, based on the molality. ...

*March 9, 2010*

**college chem**

N2O4 --->2NO2 a 1 liter flask is charged with .4 mols of N2O4. at equilibrium at 373 k, .0055 mols of N2O4 remain. what is the Kc for this reaction? please explain to me how to get the rate law for this and solving

*March 9, 2010*

**math**

OH,,, well i found out what i needed.. THANKS FOR YOUR HELP SO FAR!!!! :)

*March 8, 2010*

**math**

ya but where did you get the 4x? SORRY!

*March 8, 2010*

**math**

how did you get that answer from the question renee posted

*March 8, 2010*

**math**

If the team wins, (A) Then the team remains in the playoffs. (B) If the team stays in the playoffs (B) then the championship is within reach. (c) Therefore, if the team wins, (A) the championship is within reach.(c) It is not logically correct because The A's, C's, and...

*March 8, 2010*

**college chem**

why is PCl5 .1 -.o5 that's what i don't understand i know its .1 bec of the molar but why minus .05 shouldnt it be something close to .1

*March 7, 2010*

**college chem**

how did u get that equation

*March 7, 2010*

**college chem**

In the reaction PCl5(g) ---> PCl3(g) + Cl2 (g) 0.200 mol of PCl5 is introduced into a 2.00 liter vessel. At equilibrium, the concentration of Cl2 is found to be 0.0500 molar. Find Kc for the reaction.

*March 7, 2010*

**Math**

Solve each formula for N r/n + 2 = p t=100 (n+3) pv/nr = T 8a + 2n + 6b

*March 7, 2010*

**Math**

t=100 (n +3) PV/NR= T 8a + 2n = 6b r/n + 2 = p

*March 7, 2010*

**Math**

y=3x+2

*March 7, 2010*

**calculus**

Give the volume of the solid generated by revolving the region bounded by the graph of y=ln(x), the x-axis, the lines x=1 and x=e, about the y-axis

*March 4, 2010*

**math**

x+9y=18 find slope

*March 3, 2010*

**english**

u guys are horrible

*March 2, 2010*

**art**

What is the main difference from da Vinci's Last Supper and Andrea del Castagno's Last Supper?

*March 2, 2010*

**algerbra**

you helped me with this chem ques and you got close to 1 how did u get it please help me?You end up with a cubic equation for x. You may have to solve it graphically. Take the root that is between 0 and 1. As x -> 1, the term on the left approaches 4/[(0.5)(2-2x)^2 ] = 2.27...

*March 1, 2010*

**algerbra**

4x^2/[(1.5-x)(2.0-2x)^2] = = 2.72 x 10^11 solve for x

*March 1, 2010*

**question**

is kung fu a sport?

*March 1, 2010*

**algerbra**

4x^2/[(1.5-x)(2.0-2x)^2] = = 2.72 x 10^11 solve for x

*February 28, 2010*

**maths PLEASE HELP**

write x^2-11/5 log(2 x-1)+11/5 log(x-2)+ c as a single log im not sure how to change the brackets

*February 28, 2010*

**math**

4x^2/[(1.5-x)(2.0-2x)^2] = = 2.72 x 10^11 solve for x

*February 28, 2010*

**art**

can you change the relationship between object and background by changing their colors? what happens

*February 27, 2010*

**college chem**

At 750°C, the Kp for the reaction 2 CO + O2➞ 2 CO2 is 2.72 x 10^11. ( 2.72 times ten to the eleventh) At that temperature, CO and O2 are added to a constant volume vessel. The initial pressure of the CO is 2.00 atm, and that of the O2 is 1.50 atm. Calculate the ...

*February 27, 2010*

**college chem**

do you have to use limiting reagent for this problem

*February 26, 2010*

**college chem**

At 750°C, the Kp for the reaction 2 CO + O2➞ 2 CO2 is 2.72 x 10^11. ( 2.72 times ten to the eleventh) At that temperature, CO and O2 are added to a constant volume vessel. The initial pressure of the CO is 2.00 atm, and that of the O2 is 1.50 atm. Calculate the ...

*February 26, 2010*

**Chemistry**

Gold crystallizes in a face centered cubic structure. Using only a periodic table for refrence, determine the edge length of a gold unit cell. Show all Work.

*February 21, 2010*

**Chemistry**

Order the following solids according to increasing lattice energy. HgI2, CdCl2, ZnCl2 Now I get how to sort of do it, but I do not get how to do it if I'm looking at its radius if they do not provide it in the question.

*February 21, 2010*

**Chem**

Carbonic acid is a diprotic acid that ionizes in two stages. Write the two equations for the successive ionizations of carbonic acid in water.

*February 21, 2010*

**Chemistry**

Using the balanced reaction, enter the formula, charge(if any), and state of the species (exclude H2O) in solution if ZnCl2(aq) reactant is present in stoichiometric excess. Separate your answers by comma. ZnCl2(aq) + K2CO3(aq) → ZnCO3(s) + 2KCl(aq)

*February 18, 2010*

**algebra**

(8/125)^-(2/3)

*February 16, 2010*

**Chemistry**

Based on the balanced equation 2NBr3 + 3NaOH → N2 + 3NaBr + 3HOBr calculate the number of NaBr formula units formed when 126 NBr3 molecules and 192 NaOH formula units react?

*February 15, 2010*

**math**

simplify 8{[4(q-4)+16]-[2(5q-3)+3]}

*February 11, 2010*

**math**

simplify 8{[4(q-4)+16]-[2(5q-3)+3]}

*February 11, 2010*

**Chemistry**

thats wrong. don't listen to him

*February 8, 2010*

**math 4th grade**

2+7=9 7+2=9 1+8=9 8+1=9 3+5+1=9 5+1+3=9

*February 7, 2010*

**statistics**

What is the value of the z-scores if the area of the curve to this point is 0.887? How much of this are is between the peak of the curve and this point?

*February 1, 2010*

**Environmental Science**

I am guessing you have Lincoln Interactive?

*February 1, 2010*

**Math**

Simplify 2/7(-7x^2) what are the steps involved? thanks alot!

*January 27, 2010*

**chemistry**

Is hexane and ethylene chloride miscible? Why?

*January 27, 2010*

**math**

how do I solve : -4/ x+4 = -3/x+6?

*January 26, 2010*

**Math**

I posted this problem the other day and someone answered it but when I checked my book I realized that I wrote the problem wrong. This morning when I posted I had put the wrong answer. The answer is suppose to be 1/8 but I don't understand how to solve the problem. Help ...

*January 23, 2010*

**Math**

I'm so sorry it's suppose to be 1/8

*January 23, 2010*

**Math**

I posted this problem the other day and someone answered it but when I checked my book I realized that I wrote the problem wrong. The answer is suppose to be 43/128 and I can't get it. Thanks (1/4)^2/(1/2-3/4)+ 3/2^3

*January 23, 2010*

**social studies**

why do you think much of the land settled between 1700 and 1760 was farther inland rather than on the coast

*January 22, 2010*

**Math**

11/16-(-3/4)^2 divided by 2/5 ^3

*January 22, 2010*

**math**

how many philippine 5 cents are there in 10 peso bill?

*January 21, 2010*

**Alg II**

*in the original equation it was supposed to be +6x-13 not =6x-13

*January 20, 2010*

**Alg II**

I'm working with finding roots of polynomial equations with degrees of 3 or higher. I have the equation r(x)=x^4-6x^3+12x^2=6x-13 I used a graphing calculator to find the real roots of 1,-1 Then I did synthetic using -1, and I ended up with the equation x^3-6x^2+2x-13 How ...

*January 20, 2010*

**Alg II**

I'm working with finding roots of polynomial equations with degrees of 3 or higher. I have the equation r(x)=x^4-6x^3+12x^2=6x-13 I used a graphing calculator to find the real roots of 1,-1 Then I did synthetic using -1, and I ended up with the equation x^3-6x^2+2x-13 How ...

*January 20, 2010*

**Trig/Math**

thank you!!

*January 20, 2010*

**Trig/Math**

Find all the points having an x coordinate of 2 whose distance from the point (-1,-5) is 5. so far i have 5=sqrt((-1-2)^2+(-2-y)^2) 5=(-3)^2 how do i simplify the rest of the equation so i can find x. do i foil it out? thanks.

*January 20, 2010*

**english**

Think about each character's perspective and how they relate to the other characters in the book. It's been awhile since i read things fall apart, but think about how Janie's journey relates to Okonkwo's. How are their families alike? How are their hardships ...

*January 20, 2010*

**english**

i mean like info about bugsy malone and how he stared his life to become a film movie star etc

*January 19, 2010*

**english**

my teacher told me to find a bio of bugsy malone ganster i look all over and nothing can u help me please

*January 19, 2010*

**OCHEM**

When 2-methyl-2-butene is bubbled into dilute sulfuric acid at room temperature, it appears to dissolve. What new substance has been formed?

*January 7, 2010*

**Physics**

isn't it 80 N?

*January 7, 2010*

**math**

1000 lockers 1000 students, the first student goes along and opens every other locker. The second student goes along and shuts every other locker beginning with the number 2. The third student changes the state of every 3rd locker begining with the number 3 (if the locker is ...

*January 2, 2010*

**Physics**

56 mph7 34mph

*December 27, 2009*

**READING**

WAT DOES THE WORD DEVIOUS MEAN

*December 23, 2009*

**mechanics**

A 150kg safe on a frictionless casters is to be raised 1.20 m off the ground to the bed of a truck. Planks 3.0 m long are available for the safe to be rolled along. How much force is needed to push the safe up to the truck

*December 16, 2009*

**mechanics**

A hollow steel tube of square cross section, whose outside dimension is 10cm on side and 5 mm thick, is loaded with compressive forces of 120 KN. What is the stress produced in the members.

*December 16, 2009*

**geometry**

I have triangle XYZ with BX as the bisector sides XY and XZ are congruent. I have to write a proof for angle Y being congruent to angle Z. This is what I have, but it doesn't seem correct - can anyone help? XY is congruent to XZ - Given XB bisects angle XYZ - Perpendicular...

*December 13, 2009*

**geometry**

I am working on a geometry problem where I have to build a mobile of the quad. family. I have to state the properties of each figure. For a parallelogram I have 1. opp. sides are congruent 2. opp. angles are congruent 3. diagonals bisect each other and are congruent. For a ...

*December 12, 2009*

**math**

thanks again

*December 10, 2009*

**math**

thanks

*December 10, 2009*

**math**

sin(2arccos(1/4) - arcsin (-1/2))

*December 10, 2009*

**physics**

A farsighted man has a near point of 50 cm. What power lens should he use as a magnifier to see clearly at a distance of 15cm without wearing his glasses?

*December 9, 2009*

**physics**

if im standing 28 meters from a tree....the tree is leaning 7 degrees vertically away from u...the degree of elevation is 26 degrees from feet to tree...whats the height of the tree?

*December 6, 2009*

**English/Writing**

The purpose of a persuasive essay is not to prove anything. That might be where you're going wrong. Very few qualitative topics can be proven. The objective of your essay is to "persuade" readers towards your line of thinking. You provide a persuasive argument ...

*December 6, 2009*