Gemma
Most popular questions and responses by Gemma
Algebra
What is the length of the hypotenuse of a right triangle with legs of 5 and 12 units? What is the "hypotenuse" and "legs" of a triangle? Thanks!
asked on May 30, 2009 
earth's systems
What are the four earth systems? and how do they interact with eachother? Lithosphere, Biosphere, Atmosphere, and Hydrosphere. They operate in an integrated fashion. I recommend you cite some specific interactions. all of the systems work together by air
asked on April 10, 2007 
Chemistry
The mass of potassium iodate (KIO3) contained in an impure sample was determined by titration with sodium thiosulfate (0.1005 M). The impure KIO3 was dissolved in 50 cm 3 of water, an excess of potassium iodide (KI) and 5 cm^3 of dilute sulphuric acid was
asked on October 2, 2016 
chemistry
Is melting endothermic or exothermic? Things that are melting are taking on heat, endothermic Would freezing be the same? No, of course not. If melting is endothermic, then freezing must be exothermic. Believe it or not, and I know it sounds goofy,
asked on November 5, 2006 
Chemistry
A student completes a titration by adding 12.0 milliliters of NaOH(aq) of unknown concentration to 16.0 milliliters of 0.15 M HCl(aq). What is the molar concentration of the NaOH(aq)?
asked on April 13, 2010 
Algebra
A turbojet flies 50 mph faster than a superprop plane. If a turbojet goes 2000 miles in 3 hours less time than it takes the superprop to go 2800 miles, find the speed of each plane. I do not understand how to do this at all. Please explain as well as
asked on May 24, 2009 
Math
Jean has a total of 24 coins consisting of just quarters and nickels. The coins total $3.40. How many of them are quarters?
asked on December 9, 2013 
Algebra
Do you know a site with some practice problems for a quadratic formula (ax^2 + bx + c) for my test tomorrow? Thank you so much!
asked on May 28, 2009 
chemistry
standard enthalpies of formation H20(l) = 286 LiOH(s) = 487 standard enthalpies of solution for LiOH(s) to split into it's ions is 21 all values are in KJmol1 Use the data given to calculate a value for the enthalpy change for the reaction of lithium
asked on February 8, 2011 
Algebra
A longdistance call using DEC costs 20 cents for the first minute and 16 cents for each additional minute. The same call, placed on LCS, costs 19 cents for the first minute and 18 cents for each additional minute. For what length of phone calls is DEC
asked on January 24, 2009 
Biochemistry
Preform dilution calculations for 10 ml of 2 M stock solution. Molecular weight for the component is 48.6 g / mol
asked on March 3, 2013 
chemistry
Calculate the concentration of nitrate ions, NO3 , in mol dm3, of a solution made by dissolving 2.5000 g of ferric nitrate nonahydrate in water to give 2.000 L of solution.
asked on January 30, 2012 
algebra
Mandi can be paid in one of two ways: Plan A A salary of $400 per month, plus a commission of 8% gross sales; or Plan B A salary of $610 per month, plus a commission of 5% of gross sales. For what amount of gross sales should Mandi select Plan A? I
asked on January 24, 2009 
math
Given: f(closure(A)) subset of closure(f(A)) Prove: For any closed set A in Y, f^1(A) is closed in X (AKA f is continuous) X and Y are metric spaces f: X > Y f^1 is f inverse. closure(A) = A U limit points of A The first line is Let C be a closed subset
asked on April 14, 2013 
physics
At what force would a 16k object travelling at 25mph hit a stationery object
asked on March 6, 2015 
English
Do you hyphenate 3D or leave it one word?
asked on October 17, 2009 
Chemistry
P4 (g) + 3O2 (g) P4O6(s) At a particular temperature, Keq = 4.6. If [P4O6] at this temperature is 1.2M, calculate the concentration of P4 and O2 I'd rather have someone tell me how to do it, so I can do it myself since it's in preparation for an exam.
asked on November 19, 2015 
Math
Whats my rule Input 140. Output. 22 Input 100. Output. 62 Input. 91. Output. 71 So if the input is 10 what is the output?
asked on May 13, 2014 
maths
prove by mathematical induction that 7n+4n+1 is divisible by 6
asked on October 31, 2012 
Biology
what differences would there be in the product cells at telephose II of meiosis if there had been one crossing over at a position halfway between the Huntington disease gene and the centromere.
asked on April 10, 2007 
chemistry
calculate the mass of iron in 2.5000g of feric nitrate nonahydrate Fe(NO3)3.9H2O
asked on February 4, 2012 
music
for my music homework i have to do a poster on mozarts minuets and i don't know anything about him .please help!!!!!!!!!!!!!
asked on June 28, 2011 
Chemistry
A biomass power station burns forestry residue which has 2000 ppm potassium in it and produces 2% ash by weight (think Ive worded that right). I need to find the fraction of K2O in the ash, but only the fraction of K in the fuel as a whole is given.
asked on February 7, 2011 
Chemistry
what is the pH of Sulphuric acid? It depends upon the molarity. pH = log(H+) log = ? pH = log(H^+) find (H^+), punch that into your calculator, change the sign to minus, then find the "log" key and punch that. That will be the pH.
asked on March 12, 2007 
Science
which action would result in the more (financially) valuable product: taking one proton from each nucleus in a sample of gold or adding one proton to each gold nucleus? Taking a proton (p) away 79 AU  1p = atomic number 78?? Adding a Proton Au79 + 1p =
asked on March 12, 2007 
science
A 0.21 g of Sulfuris acid is dissolved completely in sufficient water to make 0.25 litre of final solution. Calculate the hydrogen ion concentration (in mol 1 1) in this solution. Give your answer in scientific notation to an appropriate number of
asked on March 6, 2007 
History
were there any similarities between the roman emperors nero and caligula, and the roman general mark antony?
asked on November 18, 2015 
Geometry
Given circle A with circumference 20 pi and the length of arc KD equal to 10/3 pi. Find the area of the shaded region. >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> Is there any way I can post a diagram?
asked on March 6, 2011 
Art
I need to know about the symbolism in Olympia, can you explain what this means please.
asked on January 16, 2011 
science
Gametes produced in the process of meiosis in humans (chromosome 4)has a long and short arm the short arm has the gene for Huntington's (H) attached and the long arm the gene for Red hair (R) state the differences in the product cells at telophase II if a
asked on April 10, 2007 
Chemistry
suppose that ununhexium undergoes a succession of adecays reactions. What isotype would be the final product? how did you arrive at this answer? and is it a lanthanide, actinide, transition or typical element? See the post above as a response to bertie.
asked on February 6, 2007 
cHEMISTRY
GIVE THE EMPIRICAL FORMULAE OF THE HIGHEST HYDRIDE AND HIGHEST FLUORIDE OF UNUNHEXIUM, EXPLAINING HOW YOU ARRIVED AT YOUR CONCLUSIONS Here is the web site for a very good periodic table. Look for element #116, Uuh. Elements in the periodic table have
asked on February 6, 2007 
ives
what is the area of the largest square that can be cut from a circle of radius 1?
asked on February 6, 2017 
Maths (Coordinate Geometry)
A point P(x,y) moves so that the line joining P to A(9,5) is perpendicular to B(4,5). Derive an equation specifying the locus of P.
asked on May 8, 2016 
Medical billing
2nd question, pt present for PO check of head wound Pariental area healed well. RTO prn ( pf hx/px/sf/mdm) what is the code...
asked on December 4, 2011 
Medical billing
Pt present for suture removal. sutures removed and slight oozing occurs in midsection of wound. wound dressed and pt advised to aply antibaterial cream daily. retn in 4 to 5 days for final check(PF HX/PX SF/MDM...WHAT IS THE OV
asked on December 4, 2011 
MATH
is there anyway that a diagram or something can be drawn or pasted into the question box for a math problem?
asked on March 6, 2011 
hospitality
give 2 legal obilgations of manufacurers and employers with regards to cleaning agents
asked on February 17, 2010 
Algebra PLEASE help!
(x+3/4)^2 = 17/16 My teacher taught us a square root method, but I am confused with it on this one! I would prefer if you show me using square roots, but if you have another way, please help too! Thank you!
asked on May 12, 2009 
Biology, please help
Gametes produced in the process of meiosis in humans (chromosome 4)has a long and short arm the short arm has the gene for Huntington's (H) attached and the long arm the gene for Red hair (R) state the differences in the product cells at telophase II if a
asked on April 10, 2007 
science
I am writing an essay on the subject of, 'The metabolism of green plant cells in relation to energy exchange process.' Can anyone advise of key ideas to include please? This is a very, very complicated subject. Look here:
asked on April 9, 2007 
science
When an acid and an alcohol react does it produce an ester? If so ehat type of reaction is this? I call it esterification. It is also an elimination reaction in that water is eliminated.
asked on March 12, 2007 
maths
3. Suppose that a particle moves in a plane with trajectory given by the polar equation r=2bsintheta for some constant b > 0.Show that this can be written in Cartesian coordinates as,x^2 + (yb)^2 = b^2;This is the equation for a circle of centre (0; b)
asked on February 20, 2013 
medical billing
help ...Pt present for suture removal. sutures removed and slight oozing occurs in midsection of wound. wound dressed and pt advised to aply antibaterial cream daily. retn in 4 to 5 days for final check(PF HX/PX SF/MDM...what is the code
asked on December 4, 2011 
earth
sam weighs 720N on the earth and 120N on the moon.what does this tell you about the value of gravity on the moon?
asked on November 6, 2011 
To Adam/Anthony/Hols
Any help with s103 06 QUESTION 5?? You would do better, I think, to post your question and let everyone try to help rather than using only students taking the course.
asked on March 12, 2007 
Chemistry
I know that Ununhexium is in period 7, group 16. What evidence would be able to support this? Here is a web site for an online periodic table. Look for Uun, element #116. That will give you the info you need. http://www.webelements.com/
asked on February 6, 2007 
art
where does banksy come from
asked on October 15, 2008 
re
for my re homework i need to find 3 pieces of evidence of what jesus did and 3 pieces of evidence what jesus didn`t do . i only need a little bit of info not pages of it. thanks!
asked on September 22, 2008 
science
what is the meaning of a glycosidic C1 to C4 linkage? Since this is not my area of expertise, I searched Google under the key words "glycosidic C1 to C4 linkage" to get these possible sources:
asked on March 18, 2007

Chemistry
Is that correry?
posted on October 4, 2016 
Chemistry
I got 0.1099g
posted on October 3, 2016 
Chemistry
How do I find mL?
posted on October 3, 2016 
maths
Steve
posted on October 31, 2012 
maths
its 7^n+4^n+1
posted on October 31, 2012 
medical billing
I did using my materials but I get comfuse do I code twice.
posted on December 5, 2011 
cook
I beieve is Gumbo
posted on December 4, 2011 
Medical Billing
diagnose is 681.11 E/M 99202, I&D great toe 10060 modifier TA, Excision great toe 11750 modifier TA, and 99024 PO check..
posted on December 4, 2011 
Geometry
Reiny?
posted on March 6, 2011 
Geometry
The shaded region is between IKD THere are to lnes opposite of each other. Then to parallel lines through those lines. Thers is a circle in the middle with a circumference of 20 pi. THen there is a triangle that connected to the outer lines to the right.
posted on March 6, 2011 
chemistry
Molarity = moles/volume (dm3) so you need to convert your volume into dm3. 1dm3 = 1000ml so your equation should be; molarity = 0.56/0.100 = 5.6moldm3
posted on February 9, 2011 
chem
Not sure about the KBr and the sand but iron is magnetic so that can be removed with a magnet. Sorry I cannot answer fully.
posted on February 8, 2011 
Chemistry
The first step would be to calculate the MR's of each substance so you could get the reacting masses so: 3H2 = (3 x 2 x 1) = 6 N2 = 14 x 2 = 28 2NH3 = (2 x 14) + (2 x 3 x 1) = 34 so in theory you need 6litres of H2 and 28litres of N2 to produce 34litres of
posted on February 8, 2011 
Chemistry
Electrostatic bonding forces relates to covalent compounds and the shared pair of electrons, it is when the nucleus of one atom attracts the electron of another atom and the electrons become shared between the two atoms. All you need to do now is pick out
posted on February 8, 2011 
chemistry
Use the formula moles = mass/Mr Mr of sodium = 23 Rearrange the equation to make mass the subject. mass = moles x Mr and put in the numbers... mass = 2 x 23 = 46g Hope this helps
posted on February 8, 2011 
chemistry
You need to know the formula for silver nitrate which is AgNO3 Then you work out the MR of silver nitrate = 108+14+(16x3) = 170 Then you work out the MR of the nitrogen contained in silver nitrate. There is just one nitrogen atom so it would be 14. Then
posted on February 8, 2011 
Chemistry
first of all you would need to find out the number of moles in solution using moles = mass/Mr Mr of AgNO3 = 108+14+(16x3) = 170 moles = 1.70g/170 = 0.01 Then you can use the formula: concentration = moles/volume(dm3) = 0.01/0.250 = 0.04moldm3 hope this
posted on February 8, 2011 
algebra
Thank you for your help!
posted on January 24, 2009