Newest questions posted by Noelle
  1. history

    How did muckrakers of the 19th century compare to modern day journalists?
  2. Math, Ratio and Proportion

    Jeff mowed 2/3 of a lawn in 52 minutes. At that rate, How long would it take him to mow the whole lawn?
  3. English

    In the State of Union Address the President promised to improve the faltering economy, to increase the amount of federal funding available for the art programs and ?
  4. Math

    A bag of balloons contains 2 red balloons, 10 green balloons, 16 yellow balloons, and 7 orange balloons. What is the probability that a randomly selected balloon would be green or orange?
  5. Chemistry

    If a solution containing 118.44 g of mercury(II) perchlorate is allowed to react completely with a solution containing 17.796 g of sodium sulfide, how many grams of solid precipitate will be formed? How many grams of the reactant in excess will remain
  6. Chemistry

    In the following reaction, 451.4 g of lead reacts with excess oxygen forming 313.6 g of lead(II) oxide. Calculate the percent yield of the reaction. 2Pb(s)+O2(g)= 2PbO(s)
  7. Chemistry

    Balance the redox reaction: Ag(aq)+Cu(s)= Ag(s)+Cu(aq)
  8. Chemistry

    For the following chemical reaction, what mass of silver nitrate in grams will be needed to produce 3.91 mol of calcium nitrate? CaI2+2AgNO3=2AgI+Ca(NO3)2
  9. Math

    25. Edith earns an annual gross salary of $17,500. She has 28% of her gross salary withheld for taxes and other deductions. What is the net pay of each paycheck if she is paid weekly? $274.04 $43.87 $242.31 26. Franklin deposited $1,400 in a savings
  10. algebra

    Solve -3(5x+6)=57
  11. algebra

    Solve -3(5x+6)=57
  12. statistics-math

    The mean score on a Math exam was 50% and the standard deviation was 10%. Assume the results were normally distributed. (a) What percent of students earned a score between 50% and 70%? ( /2)
  13. physics

    A block of wood is placed in a cup of water. The block has the following dimensions: L=10cm W=5cm H=4cm. If the block is 75% submerged, how much water has been displaced?
  14. Chemistry

    Flask a contains 2 liters of ch4 (g) and flask b contains 2 liters of 02 (g) each gas sample has the same 1) density 2) mass 3) number of molecules 4) number of atoms
  15. chemistry

    how many grams of oxygen are in 560g of ribose?
  16. Math

    Im in advanced math and were doing Graphing Inequalities and im not sure how to do it.
  17. physics

    How would you find the coefficient of kinetic friction if you're given a weight of 627 N and theta=45 degrees?
  18. Chemistry

    Radiation in the ultraviolet region of the electromagnetic spectrum is quite energetic. It is this radiation that causes dyes to fade and your skin to develop a sunburn. If you are bombarded with 1.00 mol of photons with a wavelength of 288 nm, what amount
  19. Chemistry

    Suppose you are standing 201 m from a radio transmitter. What is your distance from the transmitter in terms of the number of wavelengths for the following conditions? (a) The station is broadcasting at 1150 kHz (on the AM radio band)? (1 kHz = 1
  20. Chemistry

    Sulfur (3.26 g) is burned in a constant volume calorimeter with excess O2(g). The temperature increases from 21.25°C to 28.22°C. The bomb has a heat capacity of 923 J/K, and the calorimeter contains 815 g of water. Calculate ΔU per mole of SO2 formed,
  21. Chemistry

    When 112 g of water at a temperature of 22.5°C is mixed with 65.1 g of water at an unknown temperature, the final temperature of the resulting mixture is 46.3°C. What was the initial temperature of the second sample of water?
  22. Chemistry

    What volume of 0.105 M HNO3, in milliliters, is required to react completely with 1.40 g of Ba(OH)2? 2 HNO3(aq) + Ba(OH)2(s) Ba(NO3)2(aq) + 2 H2O(l)
  23. Chemistry

    In an experiment 1.015 g of a metal carbonate, containing an unknown metal M, is heated to give the metal oxide and 0.361 g CO2. MCO3(s) + heat MO(s) + CO2(g) What is the identity of the metal M?
  24. Chemistry

    A mixture of CuSO4 and CuSO4·5 H2O has a mass of 1.235 g. After heating to drive off all the water, the mass is only 0.830 g. What is the mass percent of CuSO4·5 H2O in the mixture?
  25. Physics

    What is the period of the minute hand of a clock?
  26. College Physics

    A CD has to rotate under the readout-laser with a constant linear velocity of 1.25 m/s. If the laser is at a position 3.2 cm from the center of the disk, what are the revolutions per minute (rpms) of the disk?
  27. Chemistry

    1. Engineers design air bags that deploy almost instantly upon impact. To do this, an air bag must provide a large amount of gas in a very short time. Many manufacturers use sodium azide, NaN3, to produce the gas in such a manner 2NaN3(s)  2Na(s) +
  28. Chemistry

    For each of the following, write a net ionic equation (modeled above). Wherever there is a precipitate, state the name of the precipitate (e.g “lead iodide” from above). Pop onto the net and see if you can find a description of the physical properties
  29. Physics/ optics

    An object is located 25cm in front of a +6.00 lens, where is the image? is it real or virtual?
  30. optics

    An objuect is located 20cm in front of a -3.00 lens where is the image?
  31. Pre-Calculus

    After leaving an airport, a plane flies for 1.75h at a speed of 200km/h on a course of 100 degrees. The plane then flies for 2 hours at a speed of 250km/h on a course of 40 degrees. At this time, how far from the airport is the planee?
  32. maths

    if (x + 3)(x -2) = 1 show that x^2 + x -7 = 0
  33. math

    Convert 3214five to base ten
  34. math

    Dorthy is 6 years older than Ricardo. The product of their present age is twice what the product of their ages was 6 years ago. How old is Dorthy?
  35. 6th grade vocab

    What does the word "predominant" mean? Oh and please don't give me a website with some big def. I am in 6th grade so I won't understand if the def. is big and long. It also helps if you use it in a sentence . . . just saying. :-D Thanks so much!
  36. French

    Thanks Senora for your help with the baby animals. I have a few more, which I tried googling/translating, but I found nothing. giraffe jars Thanks for your help
  37. French

    Does anyone know a list of baby animals in French, or know specifically what these are? ~baby bunny ~baby "Sanglier" ~baby "vache" ~baby turkey ~baby "Cane" ~baby cerf ~baby "jars" ~baby "jument" Merci for your help
  38. 6th grade

    How do you turn a fraction into a decimal?
  39. geometry!! urgent (math)

    The lateral edges of a regular hexagonal pyramid are all 20 cm long, and the base edges are all 16 cm long. To the nearest cc, what is the volume of this pyramid? To the nearest square cm, what is the combined area of the base and six lateral faces?
  40. algebra

    System of equations, the addition method 3x-3y=6 3x+3y=0 Whats the answer?