Questions Asked on
October 1, 2006

  1. Same substances?

    Question: Two substances, A and B, have the same melting point. how can you determine if they are the same without using any form of spectroscopy? Explain in detail. My answer: Perform a mixture melting point. In this procedure, pulverize and mix A and B

    asked by Sheryl
  2. Mixed melting point

    Question: A compound melting at 134 degrees C was suspected to be either aspirin (mp 135C) or urea (mp 133C) Explain how you could determine whether one of these two suspected compounds was identical to the unknown compound without using any form of

    asked by Sheryl
  3. Chemistry

    When 16 grams of methane gas combine with 64 grams of oxygen, 44 grams of carbon dioxide form, plus water. What mass of water is produced? You can work this problem as a stoichiometry problem OR you can recognize that the law of conservation of mass tells

    asked by Bryan
  4. Chemistry - Heat of Fusion of Ice

    Conclusion question(s) from a lab we did to find the heat of fusion of ice: Does the value obtained for the molar heat of fusion depend on the volume of water used? Does it depend on the mass of ice melted? Does it depend on the final temperature of the

    asked by J.M.
  5. AP chem

    It takes 208.4 kJ of energy to remove 1 mole of electrons from atom on the surface of rubidium metal. How much energy does it take to remove a single electron from an atom ont eh surface of solid rubidum? What is the maximum wavelength of light capable of

    asked by beth

    1.A woman rides a carnival Ferris wheel at radius 15 m, completing five turns about its horizontal axis every minute. What are (a) the period of the motion, the (b) magnitude and (c) direction of her centripetal acceleration at the highest point, and the

    asked by Amber
  7. Sublimes?

    Question: An unknown compound gave a melting point of 230C. When the molten liquid solidified, the melting point was redetermined and found to be 131C. Give a possible explanation for this discrepancy. My answer: The compound sublimed. How would

    asked by Sheryl
  8. English

    Hey i need to write a essay about the concepts of a epic hero and a modern hero like how they change and so far i have this can u take a look at it? Has the concept of the epic changed that much over time? Or, do they still have some of the same qualities

    asked by Anonymous
  9. physics

    ab elevator (mass 4850kg) is to be designed so that the maximum acceleration is .0680g. what are the maximum and minimum forces the motor should exert on the supporting cable? i know the answers but don't know how to come up with the work! (5.08*10^4N and

    asked by pat
  10. Physics

    *I really don't know how to get started. I have done lots of the homework, but this one (and a couple of others) are really giving me PROBLEMS.* In a rescue, a 76.0 kg police officer is suspended by two cables. The left cable is at an angle of 35 degrees

    asked by John
  11. physics

    because of friction, a constant force of 20 N is needed to slide a box across a room to the right at a constant speed, and box is moved 3 m. What is the friction force and how much work is done by friction force?? How much work is done by gravity? How much

    asked by mitch
  12. Calculus

    A rectangle is bounded by the x-axis and the semicircle y= ã(25-x^2). What length and width should the rectangle have so that the area is maximum? Place the semi-circle so it's center coincides with the origin. If you go a distance x to the right the

    asked by Tezuka
  13. the scarlet letter

    why, according to nathaniel hawthorne, were there few physicians in boston? (Broken Link Removed) Be sure to read the section called Revolutionary Era. =) Another place to check would be the beginning of Chapter 9, The Leech does anyone know where i can

    asked by glinda

    A city planner is working on the redesign of a hilly portion of a city. An important consideration is how steep the roads can be so that even low-powered cars can get up the hills without slowing down. It is given that a particular small car, with a mass

    asked by Haley
  15. Accounting

    For each of the following items, give an example of a business transaction that has the described effect on the accounting equation: Increase an asset and increase a liability: Increase one asset and decrease another asset. Decrease an asset and decrease

    asked by Angel
  16. Identifying controls and Variables

    Smithers thinks that a special juice will increase the productivity of workers. He creates two groups of 50 workers each and assigns each group the same task (in this case, they're supposed to staple a set of papers). Group A is given the special Juice.

    asked by Ash
  17. Physics

    *I really don't know how to get started. I have done lots of the homework, but this one (and a couple of others) are really giving me PROBLEMS.* A pickup truck is carrying a toolbox, but the rear gate of the truck is missing, so the box will slide out if

    asked by John
  18. math

    if takes 6 minutes to hard-boil 3 goose eggs when dropped into boiling water, how long will it take to hard-boil 6 goose eggs? About the same amount of time. 18 minutes

    asked by monica
  19. Physics

    *I really don't know how to get started. I have done lots of the homework, but this one (and a couple of others) are really giving me PROBLEMS.* A large fish hangs from a spring balance supported fromthe roof of an elevator. If the elevator has an upward

    asked by John
  20. electronic configuration

    how do you figure out electronic configuration of excited state? ex: identify atom & write ground state conig. 1s2 2s2 2p6 4s1 Isn't there eleven electrons here? Element number 11 is... 1s23s

    asked by hawkstar
  21. Physics

    what is the general relationship between the density of solids and the density of liquids? Are you talking about the density of substance X in the solid state vs the density of the same substance in the liquid state. GENERALLY, solids have a higher density

    asked by Katrina
  22. physics

    i thought i had the answer right, but i didnt! wat are the first few steps?? an elevator (mass 4850kg) is to be designed so that the maximum acceleration is .0680g. what are the maximum and minimum forces the motor should exert on the supporting cable? i

    asked by pat

    I HAVE TO MAKE A PROJECT ON CONSUMER AWARENESS . CAN I GET SOME MATERIAL FOR WRITING AND ONE CASE OF CONSUMER EXPLOITATION? Each monthly issue of Consumer Reports has a section devoted to false advertising and fraud. It is called "Selling It". There are

    asked by AVNEET
  24. conversion science

    convert .621 hl to liters .013 dl to liters .00078 mg to kg 2.45 g to cg 1.9 km to cm .0476 mm to dam 6.4 ul to nl need conversion and scientific notation before I can proceed from there to the lesson. This was part of an intro that I missed due to

    asked by paul
  25. Physics..up for a challange?

    Determine if the following physical equations are homogeneous a) P=FV c)F= mV^2 ---- r b) F=mV^2 (divided by r(radius) I assume you mean dimensionally homogenous. a) Power is work/time or force*distance/time. On the right side, force is velocity is

    asked by Kim
  26. solar system

    What is pluto's diameter? About half-way down the page. About 22?? km but I forget the exact number. Pluto's equitorial diameter is ~3107 miles thanks so much

    asked by Jenny
  27. physics

    a boy who is 1.5m tall throws a ball into the air the ball attains a height a of 3m above the boy's head and then falls back to the ground the boy's hand was 1.2 m above the ground when he released the ball how long does it take to reach it's maximum

    asked by rebecca
  28. HIrsch funnel

    From part of an earlier question: My question: D. What filtration device would you use to isolate 2.0 g of crystals from about 50 mL of solution after performing a crystallization? My answer was a Buchner funnel Your answer: It would need to be a SMALL

    asked by Sheryl
  29. Accounting

    I'll start with the first part of my problem. This is a long assignment since it is a weekend one. Part 1: Incomplete Comparative Balance Sheet. The percentage of Increases/decreases are to the side. And Accumulated Depreciation is listed twice. I'm

    asked by Dave
  30. prokaryotic/cells

    We just got through with a lab and we looked at ecoli, anabaena. There first section is prokaryotic cells and the question is did all living cells you saw in the lab contain mitochondrion. I know mitochondrion is the energy powerhouse of the cell but see

    asked by jeremy
  31. Physics

    A dock worker applies a constant horizontal force of 79.0 N to a block of ice on a smooth horizontal floor. The frictional force is negligible. The block starts from rest and moves 11.0 m in the first 6.00 s. What is the mass of the block of ice? *I notice

    asked by James
  32. PHYSICS: does anyone know how to do this???

    Take the weight of the child (mg), and break it into forces down the plane, and normal to the plane. down the plane mgsinTheta normal to plane mgCosTheta So friction is mu*mgCosTheta. Sliding down, the friction opposes it, so

    asked by bobpursley
  33. Science

    I missed a few days and I forgot what the following are Independent Variable Dependent Variable Control and the order of scientific methood This should refresh your memory. An independent variable is the potential stimulus or cause, usually directly

    asked by Ash
  34. Physics

    *I really don't know how to get started. I have done lots of the homework, but this one (and a couple of others) are really giving me PROBLEMS.* A stockroom worker pushes a box with a mass 10.5 kg on a horizontal surface with a constant speed of 3.00 m/s.

    asked by John
  35. Science/Mathamatics

    A typical copper ore in Canada contains about 2% of the metal. If the annual production of mined copper is about 700000 t, how much ore must be mined annually? Money,time, 2% = 700000 THEREFORE 100% = ? 100/2 X 700000 = 35000000t

    asked by the shadow
  36. Physics

    A body is said to be in uniform motion if the body covers equal distance in equal intrevals of time.Then why is it said that when a body is in rest,it is in uniform motion? "Rest" is a special case of uniform motion. The "equal distance" travelled in equal

    asked by Annarea
  37. Science

    we did a field study of two different was a grassland and one was a forest... considering that our two sites were so close together, why were the abiotic factors in the sites not identical?

    asked by B
  38. electrical trade theory. S.O.S..!!!!!!!


    asked by LOST???
  39. Math - Data Management

    It is a grade 12 course, and our current unit is Combitionations. There is on questions where there is a 4 x 4 cubic diagram, like the 1x1 squares on graphing paper but 4x4. The question is to explain how the formula 5C2 x 5C2 gives the answer to how many

    asked by James
  40. physics

    if a child pulls an old wagon up a steep incline on a sidewalk, what does a child's work do? i say, it would increase, due to the fact that it is a steep hill and it takes more work to pull the wagon up??? The child's work is done aganst gravity, and

    asked by mitch
  41. electrical trade theory. Help n Hurry!!!

    hello i'm struggeling with the following questions... Compare the no load speeds of shunt and series connected motors? compare the starting torque of a shunt and series motors? can someone help me?

    asked by michelle
  42. Science

    why would testing the abiotic factors in a field study on the same day be so important? Remember that ABIOTIC FACTORS are environmental things that does not include living things (such as the soil type, temperature, rainfall etc). It is important to test

    asked by Bulbul
  43. history

    what does this quote mean? "truth should be held sacred, at whatever cost" Sometimes the cost of being true, and accountalbe to tell the truth, costs us time, money, effort, and embarassement. Many people find it less of a cost to lie.

    asked by Anonymous
  44. English

    Do you know a site that can help me create an epic, like an epic generator or something? The Internet is a wonderful invention -- but I know of no site that will help you create an epic. Fortunately, human beings are still best at writing poetry, using

    asked by Slow Jamz
  45. algebra 1b

    i need help!!!!!!!!!!!! Please post your problem and your attempts to solve it. Then we'll be glad to help you. what's the problem? I have a test on wednesday or thursday and I think I'm gonna pass it! I need help with Simplifying i need help with

    asked by unspoken
  46. Melting point

    Do you have any idea what the melting points and range might be for a 50/50 mixture of: 1. Benzoin (M.P.: 135-136) and succinimide M.P.: 121-123 and 2. Benzoic acid M.P.: 121-122 and succinimide M.P.: 122-124 I'm doing a lab with really laughable melting

    asked by Sheryl
  47. Music

    In my music history class we have to write a paper that involves music from the 1960s. I need a song that is satire, which is making fun of the Government during the Vietnam War. OK, Samantha, you're really aging us now. We all clearly remebmer the song "I

    asked by Samantha
  48. Science

    Even without human intervention of farming, trees always try to encroach on the prairies, yet they are never able to successfully, completely do so. this is why there are naturally occurring grasslands (meadows, pairies, savannas). what are two good ways

    asked by A
  49. us history, need help quick please!!

    i need to make a t-table. i need to know the complaints of the anti-federalists about the congress, executive branch, judiciary branch, and the right of the people, and then the federalist responce to each of these complaints. Please check these sites. The

    asked by INEEDHELP!!!
  50. economics - monopoly/monopsony

    just a quick qusetion....if a firm is both a monopoly and a monopsony. How would the profit maximizing wage and lvl of labour in the short run be determined for this firm Use the profit maximizing principals. Regardless of the existing market, a firm will

    asked by kevin
  51. Macro Econ Spillover

    I have a question. In a competitive market demand will always reflect all spillover benefits? Or supply will always reflect all spillover costs? Thanks! Since this is not my area of expertise, I searched Google under the key words "spillover benefits costs

    asked by tob
  52. physics

    "Free-fall" Assigning Variables: Acceleration: If an object is going down: a = __________ If an object is thrown up: a = _________ If an object is dropped: a = _________ If an object is launched: a = _________ If yall could just give me the equations or

    asked by anonymous
  53. management

    What are Industry Profit Pools?:

    asked by lorenzo