Most popular questions and responses by Noelle
  1. 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

    asked on April 1, 2014
  2. 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?

    asked on March 30, 2010
  3. 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

    asked on September 2, 2010
  4. history

    How did muckrakers of the 19th century compare to modern day journalists?

    asked on November 14, 2017
  5. 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

    asked on October 21, 2010
  6. 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?

    asked on September 22, 2010
  7. 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

    asked on May 14, 2013
  8. 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?

    asked on September 4, 2008
  9. 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?

    asked on March 10, 2015
  10. 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

    asked on October 27, 2010
  11. 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)

    asked on September 23, 2010
  12. 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

    asked on February 16, 2011
  13. 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

    asked on October 7, 2013
  14. Math

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

    asked on November 28, 2010
  15. 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?

    asked on October 8, 2010
  16. 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)

    asked on October 7, 2013
  17. 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)

    asked on November 9, 2011
  18. 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?

    asked on September 23, 2010
  19. 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,

    asked on October 19, 2010
  20. 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?

    asked on April 19, 2017
  21. 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) +

    asked on September 2, 2010
  22. 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?

    asked on June 15, 2011
  23. 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?

    asked on September 18, 2010
  24. 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!

    asked on April 13, 2009
  25. chemistry

    how many grams of oxygen are in 560g of ribose?

    asked on February 15, 2011
  26. 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?

    asked on September 10, 2009
  27. 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

    asked on December 22, 2008
  28. physics

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

    asked on November 23, 2010
  29. Physics/ optics

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

    asked on April 2, 2010
  30. 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

    asked on December 23, 2008
  31. algebra

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

    asked on May 21, 2008
  32. 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 ?

    asked on December 6, 2016
  33. algebra

    Solve -3(5x+6)=57

    asked on May 21, 2012
  34. Physics

    What is the period of the minute hand of a clock?

    asked on September 18, 2010
  35. optics

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

    asked on April 2, 2010
  36. maths

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

    asked on January 1, 2010
  37. math

    Convert 3214five to base ten

    asked on September 10, 2009
  38. Chemistry

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

    asked on October 7, 2013
  39. algebra

    Solve -3(5x+6)=57

    asked on May 21, 2012
  40. 6th grade

    How do you turn a fraction into a decimal?

    asked on October 6, 2008
  1. American government

    Thanks Monica :D

    posted on September 21, 2017
  2. Math

    OK, I was having trouble my self on this but I do know it is complementary is 43 degrees and supplementary 133 degrees.

    posted on March 9, 2016
  3. algebra

    Well it's the reflect across the x-axis, translate 2 units to the left, translate down 2 units, stretch by the factor of 2..

    posted on February 22, 2016
  4. math

    if what you say about their approaching rate is true, jim ran 8 * 5/18 = 20/9 miles

    posted on January 5, 2016
  5. Chemistry

    I'm so do I use the coefficients to balance the equations?

    posted on October 7, 2013
  6. physics

    a: 9.8 t: 2.6 v: 2.11 d: ? d=vt+1/2at d=(2.11)(2.6)+2(9.8)(2.6) d=ANSWER

    posted on October 21, 2012
  7. science

    D: density M: mass V: volume D=M/V therefore, the density is 64/16=4

    posted on October 21, 2012
  8. Science 7

    One ohm is the resistance value through which one volt will maintain a current of one ampere.

    posted on June 15, 2011
  9. math

    1/2, 4/8, 5/10 (all you have 2 do is multiply or divide both the numerator and denominator by the same # and you get your equivalent fractions.

    posted on February 16, 2011
  10. social studies

    Type this into Wikipedia: European colonization of the Americas

    posted on October 27, 2010
  11. math

    All you have to do is divide both sides by -5. You will get -1/7 because when you divide the right side by -5, the 5's cancel out to leave you with -1 on top. Let me know if you have more questions.

    posted on October 27, 2010
  12. math

    Like this: 5/8 * 7/2 So, you multiply the two top numbers (5*7) and the two bottom numbers (8*2) to get the final answer for a.

    posted on October 27, 2010
  13. 4th grade

    What exactly is the question?

    posted on October 27, 2010
  14. math

    1,2,and 3 are right. 4. You need to multiply each side by the opposite. So to cancel out 2/7 on the left side, multiply by 7/2 to get a by itself. Then you have to multiply the right side by 7/2 also. Multiply 5*7 to get the top and 2*8 to get the bottom.

    posted on October 27, 2010
  15. substitution method

    Okay so on the first side you have 3 which needs to be distributed to both the 31 and the -6y. On the left side you will end up with 93-18y+8y=33. Now you have to finish solving for y. Add 8y to -18y then subtract 93 from both sides. I think you can take

    posted on October 27, 2010
  16. Algebra PLEASE HELP

    2r-5s=-12 5r+2s=57 2r-5s=-12 +5s=+5s 2r=5s-12 /2=/2 r=(5/2)s-6 Now that you know r, plug that into the other equation and solve for s. Once you know s, you can plug s into either equation to get r.

    posted on October 27, 2010
  17. math

    This is very simple. All you have to do is put what is equal to x in the second equation (31-6y) in for the x in the first equation giving you the equation 3(31-6y)+8y=33 Solve for the y with this equation then plug that answer into either of the equations

    posted on October 27, 2010
  18. Algebra PLEASE HELP

    You need to solve for one variable in one equation first. The easier one would probably be the first equation. Solve for r by adding 5s to both sides (which cancels 5s on the left side) then divide everything by 2. Plug that answer in for r in the second

    posted on October 27, 2010
  19. Algebra 2

    The first one you would move x to the other side making it negative, or subtract x from both sides giving: y=-x+4 -1 is the m and 4 is the b For the second one, you do the same thing. Add 4x to each side canceling the 4x on the left, or move 4x to the

    posted on September 22, 2010
  20. math

    5 people times 4 tickets each=20 tickets 20 tickets/100 tickets total=1/5 chance or 20% chance

    posted on September 22, 2010
  21. maths


    posted on January 1, 2010
  22. math


    posted on September 4, 2008
  23. Algebra(check pt 2)

    Questions 1 and 2 are correct. I'm not sure about 3 and 4.

    posted on July 3, 2008