Thursday

July 30, 2015

July 30, 2015

Number of results: 16,724

**CHM formula needed, pls?**

How many milliliters of a 0.25 M sucrose solution contain 2.0 grams? The molar mass of sucrose (C12H22O11 ) is 342.3 g/mol.
*November 19, 2012 by Vc*

**physics.pls help**

can you help me to isolate the ''t'' in this formula. d=V1t+1/2at^2 pls help
*November 5, 2011 by ted*

**CHM 152**

At 20oC, a 2.32 M aqueous solution of Ammonium Chloride has a density of 1.0344g/ml. WHat is the molality of Ammonium Chloride in the solution? The formula weight of NH4Cl is 53.50 g/mol?? I am not sure how to incorporate the density into the problem to come up with how to ...
*June 10, 2010 by Car*

**org chm**

how many grams of KOH are needed to make 590 ml of a solution with a pH of 11.35?
*November 17, 2010 by carol*

**CHM**

In the chemical formula of ammonium sulfate, (NH4)2SO4, how many hydrogen atoms are present? 4
*January 27, 2013 by jakey *

**science help**

How can you describe the location of hafnium (Hf, atomic number 72) on the periodic table? choose all that apply. -Transition metals -noble gases -group 6, period 4 -group 4, period 6 pls help me damon or ms sue pls help me pls pls pls
*March 31, 2015 by Oscar*

**physics-pls help**

The ball is thrown froma height of 10 meters with an initial upward velocity of 3.0m/s. How long does it take to land on the ground? What is its maximum height? i know the formula is d=v1t+1/2at^2 but i do not know what else to do. pls help
*November 7, 2011 by ted 2*

**math(urgent)**

$1000 was invested for two years at 10% simple interest .calculate the effective rate was earned. pls check my solve (1+0.1/2)^2-1 = 0.1025 but the true answer is 9.54% pls help me to get the formula of effective rate
*May 16, 2014 by fizz*

**science**

pls. pls. pls. somebody help me...you see im on a science class and i don't want to go to the regular section, so pls.... give me an acrostic for the word "SCIENCE"
*June 11, 2008 by chris*

**algebra pls help**

A numbmer is divided by 2, then 6 is submtacted from the result. what operations are needed to return to the original number? I am going to say: x/2 -6 the operations needed are multiplication and addition to get right answer?
*November 14, 2011 by marko*

**geography**

hi,i have make a project on hurricane Katrina on disaster management pls help to get information pls pls help me............
*June 17, 2010 by varsha*

**Chemistry :'( **

(d) Which of the following sets of quantum numbers is not permitted? Select all that apply. 2,1,1,-1/2 1,1,0,-1/2 2,-1,1,-1/2 3,2,1,1/2 Pls pls pls help me :( x
*November 18, 2012 by Anonymous*

**CHM**

How many milliliters of a 0.25 M sucrose solution contain 2.0 grams? The molar mass of sucrose (C12H22O11 ) is 342.3 g/mol. Need the formula to understand how to continue with more problems.
*November 19, 2012 by V*

**physics.pls help**

Participants in a road race take water from a refreshment station and throw their empty cups away farther down the course. If a runner has a forward speed of 6.20m/s, how far in advance of a garbage pail should he realease his water cup if the vertical distance between the lid...
*November 8, 2011 by ted*

**physics.pls help**

Participants in a road race take water from a refreshment station and throw their empty cups away farther down the course. If a runner has a forward speed of 6.20m/s, how far in advance of a garbage pail should he realease his water cup if the vertical distance between the lid...
*November 9, 2011 by ted*

**Chemistry**

My questions keep getting cut off. What am I doing wrong? Here is my question again. Thanks for the help. What is the empirical formula for a compound whose molecular formula is C2Cl6? a) CCl3 b) CCl4 c) C2Cl6 d)CCl e) more info needed I think the answer is E more information ...
*October 25, 2009 by Mattt K*

**physics**

A man is driving his car ata velocity of 100km/h on a straight road. H e sees a traffic jam at a distance and slows down to 12.5m/s in 3.0s. What is the average acceleration of the car? pls help. I know that the formula for average acceleration is V2-V1 divided by T2-T1 but ...
*October 12, 2011 by ted*

**physics.pls help**

The volume of a cylinder is defined by the formula V=pie R squared h. If initially have a cylinder with a volume of 10m cubed. Find the volume of the cylinder if the height doubles and if the height is cut in half. pls i really need help.
*November 3, 2011 by ted*

**Finance**

Omega Instruments has budgeted $300,000 per year to pay for certain ce- ramic parts over the next 5 years. If the company expects the cost of the parts to increase uniformly according to an arith- metic gradient of $1 0,000 per year, what is it expecting the cost to be in year...
*May 26, 2013 by Aly*

**chemistry**

A puncture in the tubing of a refrigerator can cause severe frosbite as chloroethane C2H5Cl, vaporizes. Use this thermochemical equation to calculate the heat absprbed when 23.6g of chloroethane vaporizes at its boiling point (9.66kj) C2H5Cl + 26.4kj arrow C2H5Cl. pls i need ...
*November 19, 2012 by Ted*

**CAN SOMEBODY PLS GIVE ME THE FORMULA FOR THIS!!???**

google is being a pain right now so i cant find a simple answer, its giving me all these complex examples instead I JUST NEED THE FORMULA FOR FINDING THE LATERAL AREA OF A SQUARE PYRAMID. THAT'S ALL. thank you.....
*February 26, 2014 by TTR+S<3 *

**Math**

Can u pls pls pls solve this algebraic expression?? I cant solve it although I tried many possible ways and solutions :/ 10+1/3[4k-(18+7k)]
*July 31, 2011 by Sally*

**physics**

can you help me to re-arrange this formula. i dont get it. V2^2= V1^2+2ad^2 I want to solve for a pls help
*October 18, 2011 by ted*

**Physical chemistry**

A mixture contains n2o4 and No2 in the ratio 2:1 by volume what is the vapour density of the mixture.Pls answer the question i have been on the question for 2 hrs by now tried solving using mole fraction ideal gas equation an using the formula molar mass /2 but still couldn't ...
*August 7, 2014 by Rajiv*

**physics**

Two children on racing bikes start from the same reference point. Child A travels 5.0m/s{right} and child B travels 4.5m/s{right}. How much farther from the point of origin is child A than child B after 5.os? pls I really really need help. I do not understand it and I do not ...
*October 4, 2011 by ted*

**chm**

The specific heat of fat is 0.45 cal/(g) , and the density of fat is 0.94 g/cm^3 . How much energy (in calories) is needed to heat 22 cm^3 of fat from room temperature (25 ^\circ {\rm C}) to its melting point (35 ^\circ {\rm C})?
*September 12, 2013 by Anonymous*

**advanced biology**

chemical properties describe how a _____ changes into a new substance. This site will give you a definition and examples. http://www.elmhurst.edu/~chm/vchembook/105Achemprop.html
*August 19, 2007 by emily*

**Physics**

A child pulls a wagon along level ground. The handle with which she pulls the wagon makes an angle of 20.0 degrees with the ground as the child pulls with a force of 78.0 Newton. What are the components of the force. Pls pls pls pls help me answer this and may God bless u!
*October 16, 2013 by Stephanie*

**physics**

pls what is the formula for calculating period given gravity, mass and length of the material
*April 5, 2010 by fe*

**chemistry**

Pleas does any one know how to calculate the number of isomers of an organic compound. Any formula pls
*March 28, 2014 by ogboyeb*

**science pls help**

i posted this earlier but got a confusing answer so pls help as best as u can asap! True or False 1. If a 40 kg person is accelerating at 10 m/s2, then the magnitude of the force acting on him or her is 400 N. (1 point) true false Multiple Choice 2. How much force is needed to...
*March 13, 2014 by TTR+S<3*

**science**

what is carbon cycling http://www.elmhurst.edu/~chm/vchembook/306carbon.html A thing made out of carbon. It is in a shape like a circle
*June 14, 2005 by Josh*

**math (if someone could show me the working pls)**

calculate the difference of the square using the following formula a^2-b^2=(a+b) (a-b) 1)28^2-12^2
*August 20, 2009 by keisha*

**chemistry**

C4 H10 O or diethyl ether or with a formula of CH3CH2OCH2CH3 its stick structure is H H H H ! ! ! ! .. H-C-C-C-C- O-H ! ! ! ! .. H H H H I used the this ! sign as a sign for bond. pls help me to determine the geometry for each central atom in this structure. 1) C Trigonal 2) C...
*October 5, 2012 by chemdummy*

**Pressure and Molecular Formula**

2. How much potassium chlorate is needed to produce 20.0 mL of oxygen at 670 mm Hg and 20 degrees C. 3. A certain compound containing only carbon and hydrogen was found to have a vapor density of 2.550 g/L at 100 degrees C and 760 mm Hg. If the empirical formula of this ...
*December 8, 2012 by Amy*

**chemistry**

why can I not use the formula m1v1=m2v2 for the following question: What volume of 1.20 M NaOH will be needed to neutralize 225 mL of 3.0 M sulfuric acid? I get 0.56 L but the answer should be 1.1 L. When am I able to use that formula and when can I not?
*October 18, 2009 by drew*

**MATH gr10**

were having an exam soon, can you list all the formulas needed..pls? i might've missed some, i just want to make shure.
*June 14, 2011 by jakil*

**chem**

Write the complete ionic equation for Cu(NO3(aq)+K2S(aq)and namd write the formula for the spectator ions in this reaction? This is what I got pls. check it: complete ionic equation: Cu^19aq)+K^1(aq)+S^-2(aq)=K^1(aq)+NO3^-1(aq)+Cu2S(s) net ionic equation: Cu(aq)+s^-2(aq)=Cu2S(...
*October 5, 2012 by Amanda*

**MANIPULATION OF DNA**

can anyone describe to me what this is pls? also can anyone pls explain how dna manipulation works and what it does pls?
*April 1, 2009 by GLORIA*

**physics.pls help**

How do you know what element is chemically active on the periodic table? PLS HELP
*October 5, 2011 by ted*

**math help**

1/4 divided by 3/8 pls help me im confuss i forgot the ste pls explain
*October 27, 2012 by Anonymous*

**pre algebra**

2x^2 + 8 - 4x + 3x - 6x^2 + 7 what does this simplify to A)-8x^2 - 7x + 15 B)-4x^2 - x + 15 C)4x^2 + x + 15 D)8x^2 + 7x + 15 pls help me reiny steve or damon pls help me
*March 23, 2015 by Oscar*

**math pls help me **

(-2y + 5 )(y + 3) what would this simplify to? A)-2y^2 + 8y + 15 B)-2y^2 - y + 15 C)2y^2 + 8y + 8 D)2y^2 - y + 8 pls help me steve or damon or ms sue
*March 23, 2015 by Oscar*

**food science**

pls give me an idea on the formulation of bavarian cream filling. pls. thank you
*January 4, 2008 by vcq*

**Science(Help NOW, Pls)**

wat elements make up water? pls help! i will be very happy if you do! :S
*December 15, 2010 by GirlSense*

**physics.pls help**

Why is it important to asaume that a rope under tension is taut and does not stretch. pls help
*November 14, 2011 by ted*

**chemistry**

In hydrated copper sulfate, the chemical formula is CuSO4.5H2O, while that of hydrated cobalt(II) chloride is CoCl2.6H2O. I want to ask how to determine the number of moles of water is needed to hydrate any salt. Is there a pattern or formula?
*November 8, 2013 by Hao*

**Science(Help NOW, Pls)**

organisms in which domain live in every environment? pls help, im stuck on this one. :S
*December 15, 2010 by GirlSense*

**physics.pls help**

A 100g bird sits in its nest. what is the Fnet(net force) in this case? pls help
*November 10, 2011 by ted*

**(pls help) algebra**

4x+y-32=1, 6x-y-4z=7, 10x+2y-6z=5 pls show me how to solve for x,y,z. Ans:xx=1.5,y=-2,z=1
*July 8, 2013 by david*

**e commerce or marketing, help pls**

hi,good evening everyone can you help me on finding a clothing manufacturer resource system??? pls thank you
*December 6, 2011 by need ASAP*

**VARIATION**

A rectangular brass slave has a square base of side x cm, and height h cm, its weight, w kg, is given by the formula w=(3x^2 h)/10. How is w changed if x is trebled and h is halved? (with solution pls... tnx...)
*January 9, 2013 by HELP HELP HELP MNHS*

**Chem**

Dear Dr., What formula is this? En = -Z^2RH/n^2 I saw you use it in one of your explanations. I know its been a few yrs since u last posted it. Pls help thanks! Yours sincerely, Johan
*September 24, 2014 by Johan*

**Physics**

A stopper tied to the end of a string is swung in a horizontal circle. If a mass of the stopper is 13.0 g, and the string is 93.0 cm, and the stopper revolves at a constant speed 10 times in 11.8 secs, what is the tension on the string? I tried solving this question using the ...
*March 25, 2013 by Ted*

**Chemistry**

rank the following atoms and ions in the order of expected increasing radius: Ca, Ca2+, Ar Pls pls help me kindly... Anyone?
*November 18, 2012 by Anonymous*

**Algebra (variation)**

A rectangular brass slave has a square base of side x cm, and height h cm, its weight, w kg, is given by the formula w=(3x^2 h)/10. How is w changed if x is trebled and h is halved? (with solution pls... tnx...)
*January 9, 2013 by HELP HELP HELP MNHS*

**PLS HELP ME WITH ONE MATH QUESTION!!???**

pllllsssss help me!!!!!!! 5. How many lateral edges are there in a triangular prism? (1 point) 6 3 9 12 I dont know if its 6 or 9 or even 12!!??? pls help asap!!!!!
*February 19, 2014 by TTR+S<3*

**Help pls. **

Compute the acceleration of the block sliding down a 30 deg inclined plane if the coefficient of kinetic friction is 0.20. Show solution pls.
*August 23, 2014 by Yan-yan*

**LA --- 1 question pls help!!!**

hi, one question based on the short story called, "Cyber Chitchat" this one confuses me, pls help if u know the book! 8. The tone of "Cyber Chitchat" is (1 point) serious. humorous. depressing. angry. i think its humorous but im not so sure..... pls help asap!!!!! thanx in ...
*March 2, 2014 by TTR+S<3*

**CHEMISTRY> HELP QUICK! pls**

I GOT THIS WRONG IN AN ASSIGNMENT. I HAVE AN EXAM IN 2 DAYS. CAN YOU SHOW ME HOW TO DO IT PLS. What is the pH of a 2.62 x 10 -1 M NaNO2 solution ? NB the pKa for HNO2 = 3.153. 12.13 13.42 1.87 8.29 0.58
*June 4, 2010 by Lucinda*

**math - pls check!!!**

Write an equation in point-slope form for the line that passes through one of the following pairs of points (you may choose the pair you want to work with). Then, use the same set of points to write the equation in standard form and again in slope-intercept form. (5, 1) and (-...
*January 13, 2015 by SkatingDJ*

**Chemistry**

the formula H2O2 is an example of 1.molecular formula 2. an empirical formula 3.an ionic formula 4.an organic formula
*November 28, 2010 by tia*

**chem**

an energy value of 3.313x10^-19 joules is needed to break a chemical bond. what is the wavelength of energy needed to break the bond? (the speed of light = 3.00x10^10 cm/sec; planck's constant = 6.636x10^-34 J . sec is there a formula i'm missing? Formula (memorize this) ...
*April 21, 2007 by ashley*

**chm I**

Lithium hydride reacts with water as follows. LiH(s) + H2O(l) -->LiOH(aq) + H2(g) During World War II, U.S. pilots carried LiH tablets. In the event of a crash landing at sea, the LiH would react with the seawater and fill their life belts and lifeboats with hydrogen gas. ...
*June 29, 2011 by lynn*

**ss --- one question pls help!**

pls help!!! What kept the price of cotton high in the years before 1860? a. cotton gin b. demand in Great Britain c. slavery d. large plantations I origionally thaught it was a. cotton gin, but after research, it looks like it was b. demand in GB my textbook doesnt say ...
*February 27, 2014 by TTR+S<3*

**Math**

Use the quadratic formula to solve the equation. x² - x = -2 Type an exact answer, using radicals as needed. Express complex numbers in terms of i. Use integers or fractions for any numbers in the expression. Use a comma to separate answers as needed.)
*April 24, 2011 by Mary*

**chemistry**

hi, I am wondering if benzyl acetate is polar or nonpolar? because it has a non polar benzene ring but also it has the ester bit attached so i am confused. Also i cant seem to understand the vander waal forces that are in it. if anybody could help that would be super A little ...
*December 18, 2006 by steff*

**physics- TEST TMRW PLS HELP!**

how would i do this? -----------------A-----------B-------- I<----1.5m------>l<--0.6m-->l<-0.3m->l a carpenter carries a 6kg board . the downward force he feels on his shoulder (A) is .... ? (B is where his hand is) pls help!! i have so much difficulty with ...
*December 9, 2012 by Anya *

**History**

The Transcendentalism movement most directly affected the development of American politics literature popular culture painting and sculpture Is it c. Pls help me ms sue or dr.bob or steve or anyone pls help me
*March 20, 2015 by Oscar*

**physics**

pls explain to me how you add 65km{North 85 degreesWest], 3500m[South 10 West}, 6000m{East 70 degrees South], 54km[North 60 degrees East]. pls explain to me how i should add these vectors. I really need help. pls help
*October 26, 2011 by ted*

**CHM 300**

if the pKa of HCN is 9.21,what it its Ka?
*October 1, 2014 by Nurcan*

**Math**

Pls help .[1] Solve the eguation 4*=28. [2] change 1/20 to decimal [3] change 60% to a common fraction . Pls i need the solving thank you
*February 23, 2012 by Bright*

**calculus**

After solving with A=(-1,2) x^2+2x^2+x+1 got 119/12a pls where did i get it wrong. And with -[(-55)] x^2-25dx i got -50 pls am i correct
*September 7, 2013 by grace*

**Lotto game**

This is winning Number, 55-80-83-65-3, pls can you help me out of the next number on 1th feb 2014, pls,
*January 30, 2014 by Adekunle*

**math pls help!!!!!**

these are the few i dont know/im not sure. pls help! The distance from Newtown to Oldtown on the highway is (6x^2 + 2x – 2) miles. Using the back roads, the distance is (5x^2 – 8x – 6) miles. How many miles shorter is the second route? A. 11x^2 + 10x - 8 B. -x^2 - 6x + 4 C. x^...
*May 31, 2014 by zumai*

**physics**

help pls. i need to find the best animation of the movement of electrons and protons... the best one... pls send me the link. thanks so much.
*April 24, 2015 by Lucy*

**social studies---check 1 question pls**

6. Whose mill launched the factory system? (1 point) James Monroe Eli Whitney ***Samuel Slater*** Francis Cabot Lowell help pls
*January 29, 2014 by TTR+S<3*

**english**

need some ideas for a classification essay on advertisement pls I have submitted three different options to my teacher and he has declined them either saying there is overlap or they are not distinct. i am stumped! pls help
*September 13, 2014 by c*

**physics.pls help**

How much time can you save travelling diagonally instead of running 450meters south and then 650meters west. if your running speed is 5.0m/s. pls help
*November 1, 2011 by ted*

**global finance**

Search: whar would jeffs monthly morrtgage payment be if he borrowed $80,000 for 30 years at twelve percent annual rate? pls give me the solution and answer by using formula FV=(1+r) to the power of t -1 over r
*March 25, 2011 by charry grace *

**CHM**

Why it is OK to prepare the titrant solution so inaccurately?
*September 19, 2014 by Jamika*

**CHM**

what is meant by the term "free calcium"?
*September 29, 2014 by Hanu*

**Science(Help NOW, Pls)**

when rock layers are pulled from opposite directions, one block tilts up, while the other block does what? answer pls, need help.
*December 15, 2010 by GirlSense*

**values...pls. help me**

can you help me please how to get an answers for this question below.. pls.give me an examples for this question. thanks God bless you.. 1.xplain a strategy wherein a liability may turn out to be an asset to ANYONE?
*August 25, 2011 by Jessie*

**CHM 157**

calculate the lattice energy of CaO
*April 8, 2008 by Anonymous*

**chm**

determing concentration by spectroscopy lab discussion?
*April 4, 2011 by iqra*

**CHM**

How to balance the following equation: Na(s) + H2O(l) yields?
*November 27, 2012 by Adam*

**chm**

how does CO2 affect the titer of a solution of NaOH ?
*September 13, 2014 by josh*

**science**

pls could u give me a website with all the science warning signs on in pls?
*October 13, 2009 by holly*

**sociology-pls help**

similarities between milgram's experiment and stanford experiment pls help
*November 4, 2011 by ted*

**science URGENT so need help**

PLS HELP ASAP True or False 1. If a 40 kg person is accelerating at 10 m/s2, then the magnitude of the force acting on him or her is 400 N. (1 point) true false Multiple Choice 2. How much force is needed to make a 60 kg object accelerate at a rate of 2.0 m/s2? (1 point) 62 N ...
*March 13, 2014 by TTR+S<3*

**chm**

I need to find the mass of 0.0225 mole of NH3?
*September 29, 2010 by cindy *

**Analytical CHM Lab**

why is NaOH a poor primary standard ?
*September 13, 2014 by Noor*

**epp**

pls this is just a simple question how can plants grow using the branch? using the fruit? ang using the head? pls answer in english or tagalog, thank you!!!
*February 19, 2008 by renz anthony*

**chemistry pls help**

If 10.0 mL of 1.0M HCl is added to 90 mL water, what is he concentration of the new solution? What is the pH of this solution? If the solution is titrated by 0.500M Ca(OH)2, how much volume (ml) of NaOH necessary? Need help pls.
*December 8, 2012 by Emmy*

**Geometry**

What formula should be used to derive the equation of a parabola given its focus and directrix? • The distance formula ?? • The midpoint formula • y = ax2 + bx + c • The area formula for a circle
*May 20, 2015 by Sandra*

**chm**

The molar solubility of PbBr2 at 250C is 1.0x10^-2. Calculate the Ksp.
*June 27, 2010 by ami*

**CHM**

Calculate the solubility of Cu(oh)2 in grams per liters of solution if Ksp for Cu(OH)2 IS 4.8X 10^-20
*June 27, 2010 by ami*

**chm**

How many valence shell electrons would you expect for an S2- ion? 8 Am I correct.
*February 18, 2013 by luck*

**ChM**

Calculate the pressure exerted by 1.2 mol of gas in a volume of 28.2 L and at a temperature of 61 C.
*July 6, 2013 by Anonymous*