Questions Asked on
November 12, 2008

chem
What is the longest wavelength of light that will provide photons of sufficient energy to break the pi bond and cause the isomerization? Energy required to break pi bond is 4.42*10^19. wavelenght=c/f but how do i figure out what f is?

chemistry
A piece of nickel foil, 0.550 mm thick, 1.25 cm width and 1.00 cm long, is allowed to react with fluorine, F2 to give a nickel fluoride. Density of nickel is 8.908 g/cm3. How many moles of nickel foil were used? If you isolated 1.261 g of nickel fluoride,

Physics
A medical technician is trying to determine what percentage of a patient's artery is blocked by plaque. To do this, she measures the blood pressure just before the region of blockage and finds that it is 1.20×10^4 Pa, while in the region of blockage it is

Trigonometry
How do i find cos(2arctan(7/24)) Thanks.

3rd grade
juan says, When you put together unequal group, you can only add. is this correct

physics
can someone help me on this? thanks a viewing window 30cm in diameter is installed 3m below the surface of an aquarium tank filled with sea water. The force the window must withstand it approximately. a. 22N b. 218N c. 2140N d. 8562N thanks

Physics
A 2.0Kg otter starts from rest at the top of a muddy incline 85 cm long and slides down to the bottom in .50s. What net force acts on the otter along the incline?

chem
Use bond energies to estimate the enthalpy change for the following reaction C2H2 + H2> C2H4 i figured the bonds broken are: 1 C triple bond C 1(812kj/mol) 2 CH 2(414kj/mol) 1 HH 1(435kj/mol) Bonds formed 1 C=C 1(590kj/mol) 4 CH 4(435kj/mol) Is this

AP Chem
Can someone please check these problems? 34. You fill a balloon with helium gas to a volume of 2.68 L at 23 degrees C and 789 mmHg. Now you release the balloon. What would be the volume of helium if its pressure changes to 632 mmHg but the temperature is

chemistry
Suppose you live in a different universe where different amount of quantum numbers is required to describe the atomic orbitals. These quantum numbers have the following rules: N principal 1,2,3,…. L orbital =N M magnetic 1. 0. +1 How many orbitals are

biology
why can prokaryotes make more ATP than eukaryotes

Chem
find pH of 0.050 M HCLO4 plus 0.050 M HBr> You must consider activities>

chem

Math
For all x>0 and y>0, the radical expression (fraction: let me try to spell it out) square root of X on top of fraction, denominator is 3 Square root of X minus the square root of Y is equivalent to:

us history
why were business leaders such as john d. rockefeller called robber barons?

1st grade
please help me with easy comments about sulpur and iron reaction

7th grade
i need help on estimatin fractions. Don't just give me the answer tell me how you got it. Problem: 6 5/8  4 5/6=

geo
What are the worlds biggest settlements?Explain.

Chem
calculate pH of the buffer solution prepared by mixing 10 mL of 1.5 M HCl with 100 mL of 0.1 M K2CO3 solution. For H2CO3: Ka1= 4.46 e^7, Ka2= 4.69e^11

science...help
please check my answer ....plz... the question is: how is the size of the minerals grains affected by the rate at which molten rock materials cools? and i think the answer is : the bigger the grains the faster it cools.

Chem
Draw the electrondot structure for CHClO.

Scinece ...help
In general, how does the characteristic minerals composition of a light colored igneous rock differ thst of a dark colored igneous rock?

Trig  tan 15° using composite argument?
tan 15° tan (45°30°) (tan 45°  tan 30°)/1+ tan 45°tan30° (1√3/3)/(1+1√3/3) then i donnt what to do/ chancel out. Can someone finish it if i didn't get it wrong. thanks in advance

chemistry
You want to heat your house with natural gas CH4. The house has 275 sq. m of the floor area and the height of 2.5 m (between the floor and the ceiling). The air has a specific molar heat capacity of 29.1 j/mol*K. The molar mass of air is 28.9 and a density

calculus
A plane is flying west at 500 ft/sec at an altitude of 4000 ft. The plane is tracked by a searchlight on the ground. If the light is to be trained on the plane, find the change in the angle of elevation of the searchlight at horizontal distance of 2000 ft.

Physics
A wire of radius R carries a nonuniform current: the current density, j, (current per unit area) varies as a function of distance r from the central axis of the wire according to j = j0(R/r) (and j = 0 outside the wire, of course). Find expressions for

Math
In the United States workers spend 72% of their gas usage to go to and from work. What fraction represents their nonwork travel and gas usage?

Economics
Evaluate the following statement: "It is easier to build an economic model that accurately reflects events that have already occured than to build an economic model to forecast future events. "Do you think that this is true or not? Why? What does this

us history
what were the effects of the Industrial Age?

us history
why did workers form unions in the late nineteenth century?

Vocabulary
How could i use synthetic in a sentence?

science
how do you rearrange 1.1513/sqrt(f)=ln(Re*sqrt(f)/2.51) to get it in terms of f and also rearrange it in terms of Re? if you identify an initial estimate of the solution for f when Re=5000 how do you plot on a scatter graph (using something like 0 to 0.1

us history
what trends or events in other countries prompted people to move to the united states in the late 19th and early 20th centuries?

Physics...
Question In an experiment a gas was found to obey the following equation of state: (P + 10^3)V = 2.5 x 10^4 J Find the work done when the gas expands from 1 m3 to 3 m3. _______ the answer is suppose to be 2.55 x 104J ____________ what i did so far 2 ways i

us history
what problems did rapid growth pose for cities?

Substitution Method in Algebra
nee help with any of the examples help me to solve this. thanks. y= 2x +3 y= 4x 1

us history
what were are the corruptions in the 19th century politics?

social studies
What was the moving of Africans to the New World colonies to be used as slaves?

Math
Divide. Round to the nearest tenth. 17/6 How do you divide 17 into 6??

geography
Define Commerical, Specialized and Subsistence Agriculture

English
Is there any good websites which can give me something to read on "About a Boy" the novel. I have to write a supervised essay in class tomorrow about how the characters change and how they "lose or gain" something. I have a brief idea on the how I'm going

US HEALTH CARE SYSTEM
Could someone please help me answer this. Americans have been resistant to national health insurance due to a strong majority belief in capitalism, yet social forces have led to compromises, such as Medicaid coverage for certain groups of needy people.

Substitution Method in Algebra
I'm having trouble with the last one too. Could you explain step by step. thanks. 4c= 3d+3 c= d 1

Physical education
Which of the four basic areas of philosophy (epistemology, metaphysics, axiology, and logic)? Is most useful for teachers? and Which philosophy of education do you think is most prevalent now?

Writing
HI, I AM WRITING A RESEARCH PAPER ABOUT SOMETHING IN WASHINGTON DC. BUT THE PAPER HAS A TWIST TO IT. IT HAS TO BE A TOPIC THAT IS CONTOVERSIAL/CAN BE ARGUED ON BOTH SIDES. I WAS THINKING ABOUT DOING SOMETHING ON THE TOMB OF THE UNKNOWN SOLDIER. DOES ANYONE

Physical education
What kinds of controversies exist in curriculum?

french
Hi I'm back and this time for the same reason as to get my french proofread and to know if I am actually doing this right. I will post the english part here is the first one English Come see the winter festival carnaval if you get the chance. Meet bonhomme

Math
at what temperature is the number of degrees celsius equal tio the number of degrees fahrenheit??

business
What sorts of insurance costs would a fastfood restraunt have to face? I know, a bit vague, but try your best

Chemistry
Each of four identical tires of a car is filled with a different gas. Gas pressure in each tire is 3.0 atm at 25oC. One tire contains neon, another – argon, the 3rd one has krypton, and the last one has unknown gas. How many molecules are there in each

math
He had 3/4 of a ball of twine. He bought 3 more balls of twine. How many balls of twine did he have altogeth? I'm not sure but is it 3 and 3/4 balls of twine. Please help, thank you.

english
i'll like to make a story of ten words about news please . the following words are.. " newsroom ,headline ,newscast , deliver ,dateline ,coverage , update ,copy ,edition ,and commentary .. thank you

english
I have this homework for english. I have to write an essay about the relationship between christopher and his father from "the curious incedent of the dog in the night time". As an IB student, i don't have alot of time on my hands so it would be really

AP Chem
Help with these two please. 105. A radioactive metal atom decays (goes to another kind of atom) by emitting an alpha particle (He+2 ion). The alpha particles are collected as helium gas. A sample of helium with a volume of 12.05 mL was obtained at 765 mmHg

Politics
Why do governments allow war and oppression to exist? What do they benefit from it?

chem
What is the longest wavelength of light that will provide photons of sufficient energy to break the pi bond and cause the isomerization? Energy required to break pi bond is 4.42*10^19. wavelenght=c/f but how do i figure out what f is?

medical terminology
How can eliminating abbreviations reduce errors?

8H MAth
factoring

French/SraJMcGin
Sorry, a little more about liaison svp. You explained that it is ok to have a liaison between "vais" and "à" but how about "tu vas à" and "ils vont à"??? Would there still be a liaison??? And there isn't a liaison when I say "tu manges une poire", or "

history
i have a history essay that needs to be done by wednesday next week. its wednesday today the week before so it would really help if someone could do it for me! the title it as follows: "The main reason for heavy casualties on the western front is because

English IV Honors
What is the best way to write a ten page term paper on fairy tales dealing with politics,changes in setting, and common fairy tale elements that are dropped and altered in the newer version of the tale Snow White and the Seven Dwarfs?

spelling
just getting home from work. my 1st grader left spelling list at school. Is there a way to get the list?

geo
what does economically diversified mean?

math
how do u do this 60 divided by 8h

Science
Explain why cellular respiration adds carbon dioxide to the atmosphere, but photosynthesis does not.

Math
I have to solve the system. 3x + y = 12 y = 9  3x I used the substitution method to get 3x + 9  3x = 12 But now I'm stuck.

Geometry
The path of a large stone fired from a torsion catapult can be modeled by y=0.0054x(squared)+1.145x, where x is the distance the stone traveled (in yards) and y is the hieght of the stone (in yards)

4th grade
what 2 bordering states use to be apart of virginia

math
who do I work this question. The length of a rectangular swimming pool is 2x  1 meters, and the width is x + 2 meters. Write a polynomial A(x) that represents the area. Find A(5).

10th grade
How many water molecules are in a 1.ooL bottle of water? The density of water is 1.00 g/mL

Chem Urgent Help
Plz explain in detail.... i tried to search on internet but i am confused with coefficents.. how to set up the equaiton .. plz help me ??? Bond enthalpy is the energy required to break a mole of a certain type of bond. O=O = 495 kj/mol SF = 327 kj/mol

French
If I would say: Je suis enchantée, is there a liaisons? Merci beaucoup!

Medical Billing and Coding
How will employees in the medical office have to be trained regarding privacy (who is responsible for training and record keeping)? What is required if an employee doesn't follow the privacy policy? When must employees be trained and in what manner?

Spanish
What is Cesar Chavez famous for?

US history
why did the anti federalists oppose an amry during peacetime (constitution)

Math
A number multiplied by itself and then by itself again gives 1,000. What is the number?

PHYSICSS
Question In an experiment a gas was found to obey the following equation of state: (P + 10^3)V = 2.5 x 10^4 J Find the work done when the gas expands from 1 m3 to 3 m3. _______ the answer is suppose to be 2.55 x 104J ____________ what i did so far 2 ways i

10th grade
Whatis the difference between the Hudson Bay Lowlands and the Arctic Lowlands?

Criminology
can someone please give me nice clear THESIS statement for this paper topic? In an attempt to combat the drug problem that plagues larger cities all over the world, harm reduction strategies have been introduced. What are harm reduction strategies and are

CTR 205
Exercise 79 Given the premises, discuss whether the conclusion of each argument that follows is (a) true beyond a reasonable doubt, (b) probably true, or (c) possibly true or possibly false. You should expect disagreement on these items, but the closer

health ethics
Paula doesn't want her violent boyfriend to know she's getting an abortion, so she ask her Dr. to send all communications to her to a post office box an to phone her only at work. What should the Dr. do legally?

combining subjects and predicates
The sun shines. The sun heats the air,

social studies
In the World War 2, what is the time period (beggining to end.) No really specific time period, probobly just the month and year.

Trig  Identies/equation, please help!
2Sin(Θ+47°)=1 ΘЄ[0°, 360°) What I did: Sin(Θ+47°)=1/2 Sin 1/2 = Θ+47° 30°+360 = Θ+47° 343° = Θ Ok, so how do i find the other solutions? In this problem its 103°. I think we were suppose to do something with the graphing calculator and

math
The edge of a cube is increasing at a rate of .05 cm/s. In terms of the side of the cube, s, what is the rate of change of the volume of the cube?

trig
use the function G(x)=x^38x +1 b) identify and verify the y intercept of G c) estimate the zeros of G to the nearest tenth d) estimate the coordinates of the relative extrema of G to the nearest hundredth e)in what intervals is G positive? Negative? f) in

4th grade
what is the meaning to sign out and take?

heathCare
I don't under stand can some help me?? A. List 2 examples of when you would use one of the various sampling techniques in the health care profession? B. When might you use one sampling technique over another? C. State the drawbacks of each sampling method.

Urgent Chem help plz
is answer +103 KJ.. plz chk Plz explain in detail.... i tried to search on internet but i am confused with coefficents.. how to set up the equaiton .. plz help me ??? Bond enthalpy is the energy required to break a mole of a certain type of bond. O=O =

Algebra
1). 3x + 7 = 9 2). 3(x + 5) + 3 = 12 Can you also please show the work so that I may have a better understanding.

4th grade
210 kids in class. one out of 7 in left handed the rest in right handed. how many are right handed.

Naming
what are people from rhode island called? rhode islanders?

poems
does anyone knowwhere i can finda 40 line remembrance day poem

Law
What is peaceful assembly?

Algebra II
I am expected to use the quadratic equation for the following: x2 + 3x – 4 = (x + 4)(x – 1) = 0. Once this is plugged into the value of x (the long equation, which I am unable to copy from the internet, but it goes 3 plus or minus the square root

Chem
Bond enthalpy is the energy required to break a mole of a certain type of bond. O=O = 495 kj/mol SF = 327 kj/mol S=O = 523 kj/mol Use average bond enthalpies to estimate the enthalpy delta H (rxn) of the following reaction: 2SF4 + O2  2OSF4 Express

Need help fast on calc
original curve: 2y^3+6(x^2)y12x^2+6y=1 dy/dx=(4x2xy)/(x^2+y^2+1) a) write an equation of each horizontal tangent line to the curve b) the line through the origin with the slope .1 is tangent to the curve at P. Find x and y of point P. when plugging y as

Calculus
A train is heading due west from St. Louis. At noon, a plane flying horizontally due north at a fixed altitude of 4 miles passes directly over the train. When the train has traveled another mile, it is going 80 mph, and the plane has traveled another 5

Social Studies
I need to find information on the exact things that the Indians, not just Squanto, did to help the pilgrims survive that first winter. I know that they helped them learn to hunt and fish and plant crops...but how did they teach them. Did they also help

US history
did rhode island oppose of the constitution because of some trade arrangement?\ if so which?

Algebra
I used an online math site, to explain quadratic equations. But the thing is, they said that (4)^2 is 16, but my calculator said 16. Why is that? And also, how does the square root of 40 break down into the square root of 4 and the square root of ten?

chemistryhelp
Why does an organic mixture being distilled using steam distillation never rise above 100 degrees Celsius?

chem
stilll didn't get it .. .. can u plz explain in detail ... how did u get the answer.. plz plz plz plz plzp l zp thnks Bond enthalpy is the energy required to break a mole of a certain type of bond. O=O = 495 kj/mol SF = 327 kj/mol S=O = 523 kj/mol Use

diction
what is the opposite of cohesive but still using cohesive in it incohesive?

Algebra
What do you do when you have a quadratic equation such as x^2=2x5, and there is no c value? Should you leave c as zero? one? Or just omit c entirely?

honors world history
how was the relationship between a Frankish king and the pope beneficial to both?

5th grade science
why is the angle of rays of sunlight so important in determining the amount of engery collected by the earth?

Chemistry
is Lead II Dichromate soluable?

Research Project on Computer Confidentiality
I have a research paper where I need to write a paragraph answering each question. The instructions are to go to the American Medical Assocation's web site at amaassn and use the search button on the upper right to look for ethical opinions oncomputer

math
Find two different sets of factors of 72 where: a. sum of 18 b difference of 21

Help Calc.!
original curve: 2y^3+6(x^2)y12x^2+6y=1 dy/dx=(4x2xy)/(x^2+y^2+1) a) write an equation of each horizontal tangent line to the curve b) the line through the origin with the slope .1 is tangent to the curve at P. Find x and y of point P.

Mathematics
A set of Egyptian cotton sheets has a list price of 130.00 but is on sale for 84.50. By what percent is the list price reduced

math
how to find the length and width and diagonal line of a rectangle

sciece
ok here is my question and plse help me in my science book its like all scientical and stuff and it just confuses me even more ok so here is my question how you can tell if something is a chemical or a physical change thanx a million

7th grade math
Multiply. 5.75 x 10 to the third power

7th grade math
Write the ratio of 1 silver dollar to 3 quarters in simplest form

Bio(its urgent!)
according to cell theory, the cell is the basic unit of structure and function in the body. in two or more sentences, explain how this fact relates to the need for digestion. please i help! i have searched the sites but cannot find a answer...... plz help!

1st grade
I can swim in the sea. You can see me at home. You can read me. You can ride me. What am I?

Mathematics
Jake's car needs repairs but he is short of cash. A payday loan company charges a fee of 46 for a two week loan of 250. This is equivalent to a discounted loan with proceeds of 250 and a loan amount of 296. What is the per annum interest rate?

Math
a.2,050 is what percent of 500? b. Estimate 41.2% of 2,500

biology
1. Clinique makes an antiwrinkle cream that you put on the skin next to your eyes. The cream contains waterfilled microcapsules that gradually burst when exposed to skin heat. The cream is approximately 85% water. Knowing that skin cells contain 70%

prealgebra
2=n(2n+3)

Health Research Project
I have a research paper where I need to write a paragraph answering each question. The instructions are to go to the American Medical Assocation's web site at amaassn and use the search button on the upper right to look for ethical opinions oncomputer

Financial Management
Out of these major feesettings issues ? what are the most important issues for a human service agency to address? What issues is least important? What is the basis for your decision 1. Direct and indirect costs 2. Depreciation and use allowance 3.

Law
if a witness had been convicted of a misdemeanor offense of passing a bad check could that information be used in court?

science
what are the four properties that can be used to classify elements?

Math
Give a combination of six and five so that the answer is nine. You can use the numbers only once and use anything like division,decimals,fraction,etc.

music
why did romanticism affect music in italy more slowly than in other countries

7th grade math
Write the ratio of 1 silver dollar to 3 quarters in simplest form is the answer 1/3

social studies
which current warms the eastern seacoast of the united states

science
_______a rhythmic disturbance that carry energywithout carrying matter

science
what happen to cereal when heated?

Newtonian physics
Over time, nonspecialists are usually able to assimilate radically new scientific ideas, even though these ideas may seem strange when they are initially introduced. Such was the case with Newtonian physics; when Newton proposed his ideas regarding motion

MGT
help! Select one of the following statements from p.221 of Supervision: Key Link to Productivity (8th ed.). Do you agree or disagree with the statement? Explain your reasons. 1. “The supervisor’s primary objective should be to avoid making mistakes in

algebra 1
plse help me 24 (3,4) (3,2) 27 (3,8) (2,5) 30. 0.2,1.1) (7,3) a line passes throught the given point. write an equation for the liine in point slope form. then rewrite the euqation in slope intercept for plse help me with these three

Geology/Glaciers
Why do north facing slopes on mountains support glaciers today while south facing slopes do not?

trig  identies
Assume that A and B are in standard position and that sin A = 1/2, cos A >0, tan B = 3/4, and sinB

geometry
what is 5y+6

geometry
what is 5y+6

please help; calc
original curve: 2y^3+6(x^2)y12x^2+6y=1 dy/dx=(4x2xy)/(x^2+y^2+1) a) write an equation of each horizontal tangent line to the curve b) the line through the origin with the slope .1 is tangent to the curve at P. Find x and y of point P.

World History
Where can I find some information about Indian Ocean trade around 650 CE? Thank you :)

Chemistry
What metal is a cell phone antenna made of?

pre cal HELP
lim (x+x^2)/3x x>0 i need to factor it first then find the limit and the answer is 1/3. I just don't know how to work it out.

Calculus
Find dy/dx by implicit differentiation. sqrt(3 x+y)=2+x^2y^2?

Algebra
Hi! Does anyone know a simple way to program the quadratic formula into a TI83 (Texas Instruments?) I googled it, but most of the results required downloading (I don't have a connecting cable), or a bunch of keys that I couldn't find on my computer. Let

English
What is the adjective in this sentence and the word it modifies? In many Japanese homes, people sleep on futons.