# Posts by Gemma

Total # Posts: 68

1. ### ives

what is the area of the largest square that can be cut from a circle of radius 1?
2. ### Chemistry

Is that correry?
3. ### Chemistry

I got 0.1099g
4. ### Chemistry

How do I find mL?
5. ### 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 then added. At the ...
6. ### 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.
7. ### 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.
8. ### History

were there any similarities between the roman emperors nero and caligula, and the roman general mark antony?
9. ### physics

At what force would a 16k object travelling at 25mph hit a stationery object
10. ### 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?
11. ### 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?
12. ### 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 of Y. Then we ...
13. ### Biochemistry

Preform dilution calculations for 10 ml of 2 M stock solution. Molecular weight for the component is 48.6 g / mol
14. ### 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 + (y-b)^2 = b^2;This is the equation for a circle of centre (0; b) and radius b. ...

Steve
16. ### maths

its 7^n+4^n+1
17. ### maths

prove by mathematical induction that 7n+4n+1 is divisible by 6
18. ### chemistry

calculate the mass of iron in 2.5000g of feric nitrate nonahydrate Fe(NO3)3.9H2O
19. ### chemistry

Calculate the concentration of nitrate ions, NO3- , in mol dm-3, of a solution made by dissolving 2.5000 g of ferric nitrate nonahydrate in water to give 2.000 L of solution.
20. ### medical billing

I did using my materials but I get comfuse do I code twice.
21. ### 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
22. ### 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...
23. ### 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
24. ### cook

I beieve is Gumbo
25. ### 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?

27. ### MATH

is there anyway that a diagram or something can be drawn or pasted into the question box for a math problem?

Reiny?
29. ### 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. the measure of the ...
30. ### 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 ...
31. ### 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 = 5.6moldm-3
32. ### 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.
33. ### 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 KJmol-1 Use the data given to calculate a value for the enthalpy change for the reaction of lithium with water. I get ...
34. ### 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 NH3. Is the ...
35. ### 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 = 0.04moldm-3 hope this helps
36. ### 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 you need to work out ...
37. ### 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
38. ### 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 the covalent ...
39. ### 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.
40. ### Art

I need to know about the symbolism in Olympia, can you explain what this means please.
41. ### 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)?
42. ### 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..
43. ### hospitality

give 2 legal obilgations of manufacurers and employers with regards to cleaning agents
44. ### English

Do you hyphenate 3D or leave it one word?
45. ### 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!
46. ### 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!
47. ### Algebra

A turbo-jet flies 50 mph faster than a super-prop plane. If a turbo-jet goes 2000 miles in 3 hours less time than it takes the super-prop 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 you can! Thanks.

(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!

50. ### 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 have no idea how to ...
51. ### Algebra

A long-distance 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 less expensive? Here'...
52. ### art

where does banksy come from
53. ### 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!
54. ### 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 masses
55. ### 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 crossing over had...

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 crossing over had...
57. ### 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.
58. ### 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: http://en.wikipedia.org/wiki/Metabolism Notice ...
59. ### science

what is the meaning of a glycosidic C-1 to C-4 linkage? Since this is not my area of expertise, I searched Google under the key words "glycosidic C-1 to C-4 linkage" to get these possible sources: http://scholar.google.com/scholar?q=glycosidic+C-1+to+C-4+linkage&hl=...
60. ### 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.
61. ### 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.
62. ### 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 = ??80 Which is more ...

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.
64. ### 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 significant figures. ...
65. ### Chemistry

suppose that ununhexium undergoes a succession of a-decays 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. All neat even with ...
66. ### 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 similar chemical ...
67. ### 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 on-line periodic table. Look for Uun, element #116. That will give you the info you need. http://www.webelements.com/
68. ### 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, freezing water to ice is an ...