# Posts by help

Total # Posts: 1,444

**Chemistry**

The vapor pressure of nitrogen at several different temperatures is shown below. Temperature Pressure () 65 130.5 70 289.5 75 570.8 80 1028 85 1718 Use the data to determine the heat of vaporization of nitrogen. Determine the normal boiling point of nitrogen.

*April 29, 2010*

**chem**

Can someone help me I need to find out how to solve the following equation What is the PH/POH of a .0727m H3O+ Solution at 25 degrees c

*April 28, 2010*

**Chem**

The density of an unknown metal is 8.94 g/cm^3 and its atomic radius is 0.126 nm . It has a face-centered cubic lattice. Find the atomic weight of the unknown metal.

*April 28, 2010*

**chem**

Why are titrations using permanganate performed in acid solution?

*April 28, 2010*

**chem**

Why are titrations using permanganate performed in acid solution?

*April 28, 2010*

**chem**

Why are titrations using permanganate performed in acid solution?

*April 28, 2010*

**chemistry**

hmmmm this doesn't seem to help

*April 23, 2010*

**chemistry**

If this "point" for a particular titration occurs at pH x, a good indicator for for the titration would be indicator. Note: Provide only 1 indicator name (even if there are other indicators possible) and make sure the spelling is correct. X indicator 0.9

*April 23, 2010*

**Chemistry**

45.0 ml of 9.0x10 the negative 2m hno3 I am needing the steps to help solve the above chem equation

*April 20, 2010*

**chemistry**

If the stockroom fails to dry the KHP to remove the waters of hydration, the student's calculated concentration for the standardized base will be (low, high, or unaffected) A drop of NaOH is hanging from the buret tip before the titration of KHP. Once the student begins ...

*April 18, 2010*

**Chemistry**

question from my previous post answered by DrBob - is this because this acts as a polyprotic acid, or because the ratio in the Henderson Hasselbach for HA/A- remains the same?

*April 13, 2010*

**Chemistry**

is this because this acts as a polyprotic acid, or because the ratio in the Henderson Hasselbach for HA/A- remains the same?

*April 13, 2010*

**Chemistry**

How would the pH differ for a 0.1M solution of NaHCO3 vs 0.2M NaHCO3 - remain the same, double, half,or can't be calculated without Ka or Kb?

*April 13, 2010*

**math**

According to the Journal of Irreproducible Results, any obtuse angle is a right angle! Here is their argument. Given the obtuse angle x, we make a quadrilateral ABCD with DAB = x, and ABC = 90◦, andAD = BC. Say the perpendicular bisector toDC meets the ...

*April 1, 2010*

**math**

According to the Journal of Irreproducible Results, any obtuse angle is a right angle! Here is their argument.

*April 1, 2010*

**math**

Show that there are no positive integers n for which n4 + 2n3 + 2n2 + 2n + 1 is a perfect square. Are there any positive integers n for which n4 +n3 +n2 +n+1 is a perfect square? If so, find all such n.

*April 1, 2010*

**Chemistry**

Why is it important to use liquids with relatively lower boiling points when using the Dumas method?

*April 1, 2010*

**Chemistry**

How do you know that the NaCl has 100 ml. How much volume does the water which is also a product have?

*April 1, 2010*

**Chemistry**

How do you determine the moles of just NaCl? and is the moles of HCl and NaOH just the molar mass? Thanks

*April 1, 2010*

**MAth**

f(x)=x^2-9x+3

*March 28, 2010*

**MAth**

f(x)=x^2-9x+9

*March 28, 2010*

**History**

WHy ere the women in ancient egypt better off than the women in ancient greece? THANKS, HELP

*March 18, 2010*

**Chemistry**

Problem: In a first order decomposition reaction, 50% of a compound decomposes in 10.5 minutes. What is the rate constant of the reaction? The solution my professor gave says: k = .693 / 10.5min Where did the .693 come from? Thanks

*March 15, 2010*

**college STATISTICS**

Sample of 80 people randomly asked in casino shows that average lost per person is $160 with a standard deviation ó = $40. Based on this data create a 99% confidence interval for population mean. Does loss of $180 for single person contradict expectation? Explain your ...

*March 7, 2010*

**Math**

An urn contains 4 green, 6 blue and 10 yellow chips. You pay $5 to draw a chip from the urn. Here are the rules of the game: if you draw a green chip, the dealer returns you your bet and gives you an additional $5. if you draw a blue chip, the dealer returns you your bet and ...

*March 7, 2010*

**Physics**

An army of armadillios is attacking Cosine Castle where the coyotes reside. If an army must clear the 45 meter walls by 5 meters, at what angle must they set their cannons (from the horizontal) in order to fire inside the castle walls? The cannons fire cannonballs at 50 m/s. ...

*February 13, 2010*

**Business**

thnx:D

*January 30, 2010*

**Business**

Make sure to identify: • Your expectation of use of research by you in the workplace (ie: user, researcher, contributor) May i knoe what this quesiton is asking!!! thnx

*January 30, 2010*

**english!**

THNX.:D

*January 29, 2010*

**english!**

Write a short analysis of the use of researching in your future industry – how do they gather or use research ie: types of projects, proposals, etc… -can u explain this question to me plz. are they asking me to write a paragraph explaing how do they do research and ...

*January 29, 2010*

**Math**

a) What is Agnessa's hourly rate of pay in a year with 26 biweekly paydays? b) Using your hourly rate computed in part a), what would Agnessa's gross earnings be for a pay period working an extra 10 hours overtime paid 1.50 times the regular rate of pay? (should be ...

*January 29, 2010*

**7th grade math**

can you help me ms.sue

*January 28, 2010*

**math**

plzzzzzzzzzzzzzz help me

*January 28, 2010*

**math**

tim and jim shared 35$ in the ratio 4:3 .how much did tim get ?

*January 28, 2010*

**math**

amy sloved 3/5 of her math problems and had 24 left to do. how many problmes did she solve ?

*January 28, 2010*

**science**

thank you so much for helping me.

*January 28, 2010*

**5th Grade Science**

oko;

*January 28, 2010*

**Earth Science**

Which of the following help create volcanoes? plate tectonics landslides cracks in Earth's crust built up magma

*January 28, 2010*

**Physics**

A merry-go-round accelerates from est at .870 rad/sec^2. When the merry-go-round has made 4 complete revolutions, how much time has elapsed since the merry-go round started? What is the angular velocity of the merry-go round? Could someone help, please

*January 27, 2010*

**6th grade math**

you don't know that we are learning that in 5th grade

*January 26, 2010*

**Physics**

Starting from rest Maria pulls horizontally on her new wagon for 1.1 seconds. She exerts a constant force of 89N against a frictional force of 43N. The wagon's final velocity is 3.2m/s. If she is on a level ground, how much does the wagon weigh?

*January 26, 2010*

**Math 117**

it takes 4 hr for 8 cook to prepare a dinner. how long would it take for 7 cooks? inverse or direct variation?

*January 25, 2010*

**Algebra 2**

2. Biologists want to set up a station to test alligators in the lake for West Nile Virus. Suppose that the costs for such a station are $2,500 for setup costs and $3.00 to administer each test. a. Write an expression that gives the total cost to test x animals.

*January 25, 2010*

**algebra**

5+5x<40

*January 24, 2010*

**algebra**

im not good at algebra is it 4

*January 24, 2010*

**algebra**

8x-(4x+6)=2 the solution is x=

*January 24, 2010*

**algebra**

0.4x+4<0.8x-7 the < has a line under it im supposed to put a inequality symbol and the rest of the answer

*January 24, 2010*

**algebra**

so the answer this whole time is 6?

*January 24, 2010*

**algebra**

a+b for a=34 and b=2 ____ 6 a+b= ______ 6 i don't get this

*January 24, 2010*

**algebra**

is there a solution to this promblem? 9x+3y=-60 -9+y=76 help please??

*January 17, 2010*

**acc/220**

Write a 350- to 700-word paper describing a balance sheet, an income statement, a retained earnings statement, and a statement of cash flows. How does a company use these financial statements to make future business decisions? Use and define the following terms in your paper ...

*January 1, 2010*

**algebra**

but it says the y intecept is (0, something

*December 20, 2009*

**algebra**

find the slope and the y intercept y=3.1x-9 the slope is the y intercept is help thank you

*December 20, 2009*

**physics**

An analyzer is rotated about an incident ray. The intensity of light is found to increase and decrease, but it does not become zero at any point. The incident light is: a.partially polarized b.plane-polarized c.polarized in two planes d.unpolarized

*December 16, 2009*

**math**

How many 2s are there in 7

*December 13, 2009*

**algrebra**

10-3y-7y<30 the solution set is {y/y>= } i dunno how to do this?

*December 6, 2009*

**HELP**

So I do I find the phase shift based off this?

*December 3, 2009*

**fallacies**

Need help with two questions 8. From a letter to the editor: “The counties of Michigan clearly need the ability to raise additional sources of revenue, not only to meet the demands of growth but also to maintain existing levels of service. For without these sources those ...

*November 24, 2009*

**algebra**

im not to good at algebra so here goes im supposed to multiply 5.(3.2) i know im supposed to multiply both sides by 5 but be on that im not sure what to do help please?

*November 22, 2009*

**physical science 8th grade**

Copper has 2 known isotopes: ^63CU atomic mass= 62.9298 and ^65 CU atomic mass=64.9278. The average atomic mass of copper is 63.546 amu. Calculate the fraction(percent) of each of the 2 isotopes of copper

*November 4, 2009*

**algebra**

1 - 11 its supposed be like that

*November 1, 2009*

**algebra**

-4x>1 - 11 typeb an inequslity or fraction

*November 1, 2009*

**algebra**

would it be 6.10 p.m.

*November 1, 2009*

**algebra**

heres a bad one i cant get trains A and B are travling in the same direction on a parrallel track train A is travling at 100 mph and train B is travling 104 mph train A passes a station at 5:10 p.m. if train B passes the same station at 5:40 p.m. at what time will train B ...

*November 1, 2009*

**algebra**

i have to find the slope and the y intercept i don't no how to do slopes f (x)=-5x-2 the slope is the y intercept is(0, )

*November 1, 2009*

**business**

I have to write a paper on a detail dealing with a problem in a medical supply office. 10 years ago Liz Jakowski promote me to office manager. I manage two employees: jack snyder and ruth disselkoen. My office provide office support for members of the executive team. Two years...

*November 1, 2009*

**algebra**

y=x-4 x+y=14 x+(x-4)=14 x+x-4=14 2x=18x x=9 check answer x+(x-4)=14 9+9-4=14 18-4=14 14=14 so 9 is your correct answer

*November 1, 2009*

**Calculus**

So how come we can not say that x can not equal 3 because I'm getting 8 when x = 3 also how come we say range is all reals when its not because y will never equal 1

*October 31, 2009*

**Calculus**

...every number except 1?

*October 31, 2009*

**Calculus**

so the range is... y is... arg confused

*October 31, 2009*

**Calculus**

oh... I did it right graph it if you don't believe me

*October 31, 2009*

**Calculus**

1 + 0 ------------- 1 - 0 I'm just getting 1????

*October 31, 2009*

**Calculus**

wait what am I doing wrong here (X+5)/(X - 3) (x+5)/x -------- (x-3)/x (1+5/X) -------- (1-3/x) i forgot were to go from here

*October 31, 2009*

**Calculus**

no... also all reals is wrong because i know you can never get a value greater than -5/3

*October 31, 2009*

**HELP**

I'm sure i did it right

*October 31, 2009*

**english**

please could someone tell me if my essay is ok.

*October 31, 2009*

**7th grade**

^^ i wwant to ask about... 1,000,000; base 10

*October 23, 2009*

**Math**

How do i change these into y=? 3x – 2y = –1 --> -2y= -1-3x 5x + 2y = 25 --> 2y= 25-5x

*October 19, 2009*

**Math**

Solve v/9 - v/ 21 +1/9 Answer is 0 Is this right

*October 18, 2009*

**Math**

Thank you I forgo about checking the answer

*October 17, 2009*

**Math**

the speed of train A is 16 mph slower than the speed of train B. Train A travels 210 miles in the same time it takes train B to travel 290 miles. Find the speed of each train. Train A = 58 mph Train B = 74 mph Can you tell me if this is right

*October 17, 2009*

**Math**

Thank you

*October 17, 2009*

**Math**

The problem is (14ac)-a^2-2ac+b^2) I need to subtract by removing a factor of 1 when possible the answer that I got is -a^2+16ac+b^2 can anyone tell me if this is right and if not can you help me solve

*October 17, 2009*

**MATH**

How many three-letter code symbols can be formed from the letters A, C, K, L , and M without repetition?

*October 17, 2009*

**Math**

I can not figure out the next step can someone help (x+3)*4+(x-3)*3=-5x 4x+12+3x-9=-5x 7x-3=-5x

*October 15, 2009*

**English**

I have an essay exam tomorrow, please can someone help me get some ideas about symbolic violence and how it effects men. I need it as soon as possible; because i have no idea about anything. Please someone help me!!!

*October 12, 2009*

**writing**

i have an essay exam tomorrow, please can someone help me get some ideas about symbolic violence and how it effects men. I need it as soon as possible; because i have no idea about anything. Please someone help me!!!

*October 12, 2009*

**math**

what would you consider to be the most appropriate form for displaying the data. For each set, develop and appropriately label a graph. Then write a short paragraph justifying your selection. Stress Units of Various Life Experiences Experience Stress Units Death of spouse 100 ...

*October 10, 2009*

**Physics**

thanks that helps. so how would you solve it for the other listed values?

*October 7, 2009*

**Physics**

do you know which equation to use? i have no idea what to do!

*October 7, 2009*

**Physics**

Write a projectile motion problem with the initial condition vi=15 m/s at 50° above the horizontal. Solve this problem for ∆x, max height, and time of flight.

*October 7, 2009*

**science**

so they're near around trees and water? is that right

*October 5, 2009*

**science**

can anyone help me answer this question or give me websites can someone tell what is the shield volcano environment like in or around the volcano. please help and thank you

*October 5, 2009*

**math117**

Can you divide using the foil effect the answer I got then is 8x^2-17x-9

*October 3, 2009*

**math117**

Multiply (1-x)(9-8x) the answer that I came up with is (x-1)(x-8) can some help me and if I am wrong help me to solve

*October 3, 2009*

**physics**

Cars A and B are racing each other along a straight path in following manner: Car A has head start and is a distance dA beyond starting line at t=0. The starting line is at x=o. Car A travels at constant speed vA. Car B starts at starting line but has better engine than car A ...

*September 27, 2009*

**physics**

oops i meant that vB is greater than vA...sorry!

*September 27, 2009*

**physics**

Cars A and B are racing each other along a straight path in following manner: Car A has head start and is a distance dA beyond starting line at t=0. The starting line is at x=o. Car A travels at constant speed vA. Car B starts at starting line but has better engine than car A ...

*September 27, 2009*

**Algebra**

Find the x and y intercepts: y=x^2-3

*September 19, 2009*

**science**

what is the similarities and difference between an igneous rock and a metamorphic rock? please help and thank you =)

*September 19, 2009*