Questions Asked on
November 1, 2007

  1. Chemistry

    When 23.6 of calcium chloirde CaCl2 was dissolved in water in a calorimeter, the temperature rose from 25.0 degrees C to 21.56 degrees C. If the heat capacity of the solution and the calorimeter is 1071 J/ degrees C, what is the enthalpy change when 1 mol

    asked by Lauren
  2. Math

    Runner A crosses the starting line of a marathon and runs at an average pace of 5.6 miles per hour. Half an hour later, Runner B crosses the starting line and runs at an average rate of 6.4 miles per hour. If the length of the marathon is 26.2 miles, which

    asked by Michael
  3. College Physics

    A young person with normal hearing can hear sounds ranging from 20 Hz to 20 kHz. How many octaves can such a person hear? (Recall that if two tones differ by an octave, the higher frequency is twice the lower frequency)

    asked by Jen
  4. grammar

    on a powerpoint, do you italicize or underline the title and subtitle of the book in question of the biography/ presentation? for a tv show, do you underline, italicize, or put it in quotes?

    asked by anonymous
  5. Chemistry

    A sample of natural gas is 80.0% CH4 and 20.0% C2H6 by mass. What is the heat from the combustion of 1.00 g of this mixture? Assume the products are CO2 and H2O. CH4 = -74.87 and C2H6 = -84.68

    asked by Lauren
  6. Chemistry

    Ethanol, C2H5OH is mixed with gasoline and sold as gasohol. Use the following to calculate the grams of ehanol needed to provide 293 kJ of heat. C2H5OH + 3O2 ----> 2CO2 + 3H2O Delta H = -1235 kJ How do I do this question

    asked by Lauren
  7. Chem

    Microwaves have frequencies in the range 10^9to 10^12/s (cycles per second) equivalent to between 1 gigahertz and 1 terahertz. What is the wave length of microwave radiation whose frequency is 1.258 X 10^10/s? How do I solve this problem

    asked by Lauren
  8. Physics

    A water bed has dimensions of 1.83 m 2.17 m 0.247 m. The floor of the bedroom will tolerate an additional weight of no more than 6660 N. Find the weight of the water in the bed and determine whether it should be purchased.

    asked by joe
  9. Chemistry

    A sample of natural gas is 80.0% CH4 and 20.0% C2H6 by mass. What is the heat from the combustion of 1.00 g of this mixture? Assume the products are CO2 and H2O. How do I do this

    asked by Lauren
  10. english

    what is a repetitious, overwritten sentence called

    asked by Samamantha
  11. Gov.

    I'm supposed to compare and contrast the Democrat and Republican party. I can't find a good site that just gives this information in black and white. I want statistics and facts, any site ideas?

    asked by Ashlee
  12. English

    In Dead Poet's Society, what is the significance of Mr. Keating whistling the 1812 overture? What is the significance of an Indian Cave as the meeting spot for the club?

    asked by Abby
  13. Early Child Ed.

    Would you please check these questions and my answers? 1.Research indicates a child's development of prejudice occurs as an interaction of which: A) cognitive development and positive ideas about particular groups in the child's social environment. B)

    asked by Brenda
  14. College Physics

    A baby's mouth is 30.0 cm from her father's ear and 1.50 m from her mother's ear. What is the difference between the sound intensity levels (in dB) heard by her father and by her mother?

    asked by Jen
  15. World History

    I am a freshman in a very intense AP World History Class. Anyways, our teacher rescheduled an essay to tomorrow instead of Monday, and we had 2 days to study for it, today included. There could be three possible topics, and two weren't clearly defined and

    asked by Walker
  16. Science

    i have to write a "letter" to anton van Leeuwenhoek. i have to write a letter about the impact of the microscope on biology after the 18th century. ii need like suggestions and what to put in the letter.

    asked by Mike
  17. Chemistry

    How much heat is released when a mixture containing 10.0g CS2 and 10.0 g Cl2 reacts by the equation. CS2 + 3Cl2 ----> S2Cl2 + CCl4 Delta H = -230 kJ

    asked by Lauren
  18. Physics

    Can someone please help me out on this... An ideal transformer has 50 turns in its primary and 250 turns in its secondary. 12 V ac is connected to the primary. Find: a. The volts ac available at the secondary. b. Current in the 10  device connected to

    asked by Alex
  19. chemistry

    what is the name of the polyatomic ion (C2O4)-1?

    asked by christina
  20. Chem

    Calculate the frequency associated with light of wavelength 656nm. (this corresponds to one of the wavelengths of light emitted by the hydrogen atom.)

    asked by Lauren
  21. PowerPoint

    In my PowerPoint presentation, I am presenting a biography. The book has a title and subtitle. Should BOTH be underlined? Keep in mind, this is a PowerPoint

    asked by anonymous
  22. Cultural Diversity

    Which of these statements is Not true? 1. Eye contact with the listener signals approval and consent in most Non-Anglo cultural groups. 2. African-American children are taught to look away from a peer while listening. 3. Eye contact in Asian-American

    asked by Rose
  23. Business Management

    I need answers for penn foster principles of management exams, Im not sure about my answers I need to compare.

    asked by Nattie
  24. Chem

    How much heat is released when a mixture containing 10.0g CS2 and 10.0 g Cl2 reacts by the equation. CS2 + 3Cl2 ----> S2Cl2 + CCl4 Delta H = -230 kJ

    asked by Lauren
  25. Chemistry

    A sample of 1.029g of KC8H5O4 was titrated with an NAOH solution of unknown concentration. If 22.83 mL of base was used to reach the endpoint, what was the concentration of NaOH? What mass of KC8H5O4 should be used such that a volume of NaOH between 35-40

    asked by Matt
  26. Vision/Help me

    I have put together the math in words, please help me show the work in a math format. Info below Note 1,2,3 To find the population growth rate subtract the population of 2006 from 2007. Divide that answer by the 2006 population. Australia’s growth rate

    asked by ALGRBRA
  27. Spanish

    How do you say these words in spanish? flower candle type of incense cementary mask tomb skull grasshopper Please help! Its due tomorrow!

    asked by lolliangel
  28. science PLEASE!

    Remember, the treadmil is a machine. What is the inpput force exerted by the man inside the whill?? what is the output force exerted upon the water rising from the well? waht is the mechanical advantage of this machine? the man wt is 75kg. he raises his

    asked by cam
  29. science

    which ranks the gases in order of increasing average velocity? H2

    asked by Avonlea
  30. College Physics

    In the first overtone, an organ pipe that is open at one end and closed at the other end produces the note concert A, of 440 Hz. (a) find the frequency and wavelength of the fundamental mode. (b) What will the fundamental frequency be if (i) the open end

    asked by Jen
  31. Physical Science

    A 50.0g sliver spoon at 20.0 degrees celsius is placed in a cup of cofee at 90.0 degrees celsius. How much heat does the spoon absorb from the cofee to reach a temperature of 89.0 degrees celsius? Please explain...

    asked by Sarah
  32. Physics

    This question really has me stumped and I don't know why, I seem to have forgotten the process . . . A model electric train requires 6 V to operate. If the primary coil of its transformer has 240 windings, how many windings should the secondary have if the

    asked by Melinda
  33. Physics...please help!!!

    if you draw 4 points in a square shape and try to join them all with non-crossing path you can do that, but if you draw 5 points in a shape of pentagon and try to join them it does not work. So, the question is how to prove using one of Euler's equation

    asked by MURKA
  34. Science

    I can't find 2 examples of suspensions from household items and 2 solutions from household item for Science class tomorrow!

    asked by Ashley
  35. math

    Peter is reading a 103 page book. He has read three pages more than one fourth of the number of pages he hasn't yet read. How many pages he has bot read? Estimate how many days it will take Peter to finish the book if he reads about 8 pages per day. I'm

    asked by carly
  36. ALGRBRA

    have put together the math in words, please help me show the work in a math format. Info below Note 1,2,3 To find the population growth rate subtract the population of 2006 from 2007. Divide that answer by the 2006 population. Australia’s growth rate

    asked by Vision/Help Me
  37. College Physics

    One end of a 14 m long wire having a total mass of .8000 kg is fastened to a fixed support in the ceiling, and a 7.50 kg object is hung from the other end. If the wire is struck a transverse blow at one end, how much time does the pulse take to reach the

    asked by Jen
  38. math

    Find the value of a. Find the value of the marked angles. There are 2 angles (5a+13) and (2a+70) I tried to make an equation 5a+13+2a+70+180. Right now I'm stuck. Am I on the right track?

    asked by rickell
  39. Chemistry

    What is the de Broglie wavelength of an oxygen molecule, O2 traveling at 521 m/s? Is the wavelength much smaller or much larger than the diameter of an atom. (on the order of 100 pm) How do I do this

    asked by Lauren
  40. PowerPoint

    How do you change the font and the SIZE especially of a footer? The footer on mine is the wrong font and the size is too small. Please help!

    asked by anonymous
  41. Statistics- quick! Is this right?

    I need to verify one of my answers quickly...the problem is: The mean annual salary for classroom teachers is $43,658. Assume a standard deviation of $8000. 1) Determine the sampling distribution of the sample mean for a sample of size 256. Interpret your

    asked by Laura
  42. Crossword (Spanish)

    Few questions i did not get... 1. Cual es la _______ de medicina que tomas? 5 letters 2.El medico va a _________ la garganta. 8 letters 3. Voy a la farmacia porque necesito comprar ______. 8 letters 4. Tengo la _____; voy a guardar cama. 5 letters 5. Yo

    asked by Anonymous
  43. Chemistry

    What is the wavelength of a proton traveling at a speed of 6.21 km/s? What would be the region of the spectrum for electromagnetic radiation of this wavelength. How do I do this

    asked by Lauren
  44. Religion--thesis statement help!

    Majority is where evil exists and the individual is distinctly evil, and minority is when evil does not exist, rather the actions one does can be considered evil through explanation. i need to write a strong thesis statement agreeing with the minority view

    asked by Mark
  45. Math

    During the past month, you withdrew $22 from your savings account and then deposited $24. If your balance at the end of the month is $120, how much did you have in your account at the beginning of the month? 22 24 -- = -- 120 x 2880 ---- 22x x=130.9 Is

    asked by Marie
  46. biologgyy HELP ME!

    what compound is formed from carbon dioxide in the calvin cycle?

    asked by brie
  47. please correct grammar in my paragraph

    The critics of power plants are right: The amount of radiation power plants release is dangerous. However, people don’t realize that they are constantly exposed to radiation by various ways. One can get exposed to radiation of 350 millirems from just

    asked by julie
  48. Literature

    What are the good points and bad points of naturalism and of transcendentalism? I think transcendentalism is a way to express yourself but you would also have to deal with other people who don't agree or other people who think tradition is more important.

    asked by Sam
  49. bibliography

    I'm writing an essay and I know after a quote, you write the author's name in parenthesis. however, i'm using a quote from a website, the article doesn't have an author. it is a website that just states statistics about my topic and issues and problems. so

    asked by julie
  50. Chem

    The space probe Pioneer 11 was launched April 5,1973, and reached Jupiter in December 1974 traveling a distance of 998 million km. How long did it take an electromagnectic signal to travel to earth from Pioneer 11 when it was near Jupiter.

    asked by Lauren
  51. chemistry

    what are the coefficients a, b (van der waals equation) for nitrogen/ N2?

    asked by Avonlea
  52. science

    Gravity accelerates objects downward at 9.8 m/s. How much downwards force does the man generate with each step he takes? how much work is performed when gravity pulls him down 0.5 m after each step?

    asked by cam
  53. SCI 275

    What are some goals of environmental science? I can not find the answer to that.

    asked by dawn
  54. ETH 125

    Is enviromental science the same thing as enviromental ethnics?

    asked by dawn
  55. math

    the sum of two consecutive numbersis 205. whatare two numbers? (hint:let n represent the first number. then n + 1 represents the second number.

    asked by breeawna
  56. math

    13-b/6=2-0.5b/4 I cross muliptiled and I got 12-3b=52-4b. I'm stuck. What do I do now?

    asked by marc
  57. grammar

    do you underline or put in quotes the name of a book? What about it's subtitle?

    asked by anonymous
  58. Math

    This is for grade 11 math, under quadratic extrema and roots. Fred and Ginger have 24 m of fencing to enclose a garden at the back of their house. From the pictures you can see (shows a large rectangle for the house, with a smaller one attached on the

    asked by Laura
  59. Biology

    What are the seven forms of cell transport?

    asked by Kiki
  60. goverment

    how did the framers decide how many senators each state would have

    asked by Anonymous
  61. another bio ?

    what direction along a DNA strand does DNA polymerase add base pairs

    asked by kelly
  62. Language Arts

    what are some good ways to study vocab. words?

    asked by Sarah
  63. Summary Help

    In Health class. Every week we have to do a Current Event from the LATimes which is a summary of a current event that has been posted on LATimes. Your allowed to use the newspaper or internet. My problem is summarizing it without plagiarizing the article.

    asked by Wenmar
  64. Chemistry

    The space probe Pioneer 11 was launched April 5,1973, and reached Jupiter in December 1974 traveling a distance of 998 million km. How long did it take an electromagnectic signal to travel to earth from Pioneer 11 when it was near Jupiter. Where do I

    asked by Lauren
  65. Chemistry

    A)Whats the pH of Distilled water.(is it really 7 or can be 6). B)Also whats the pH of (4o ml DI water +1.0 ml of 6.0 M HCl)? C)and also pH of (4o ml DI water +1.0 ml of 6.0 M NaOH)?

    asked by johnX
  66. Math

    Ineed help with 2 function rules. X Y X Y -4 -3 -2 -2 -2 0 0 1 0 3 1 2 Function rule? Function rule?

    asked by Mary
  67. chemistry

    whats the pH if 25.0 ml of 2.0 M NaOH is added to 1.00 L of pure water?

    asked by Niraj
  68. algebra

    can you show how to solve for x x+1/x + 6/2x-3 =0

    asked by walter
  69. accounting, correction

    can someone correct these for me thanks. If you have a spare minutes. I'll appreciate it.... Identify whether the normal balances (in parentheses) assigned to the following accounts are correct or incorrect. a. Office supplies (Debit) My answer: Correct b.

    asked by student acc
  70. maths

    Am I right? 1) 22x^2 + 16x + 64 < 0 For this problem I got: -32 > x < 24 * 35 minutes ago * - 3 days left to answer.

    asked by viku
  71. biology

    state two roles of chorlesterol in the membrane? please could somebody help me out! sam

    asked by sam
  72. accounting, correction

    Can someone correct these for me thanks I'll appreciate it very much.... Identify whether a debit or credit yields the indicated change for each of the following accounts: a. To increase Store Equipment My answer: Debit b. To increase Owner Withdrawals My

    asked by student acc
  73. Health Services

    How is the delivery system of a public organization different than that of a private organization?

    asked by Jess
  74. biology

    how does Amoeba engulf particles of food by endocytosis? please could somebody help me! sam

    asked by sam
  75. Bio

    Does Aspirin do something to the reaction of amylase with starch ?

    asked by <Y
  76. Math

    Hi, 3D GEOMETRY (P) a surface. (AB), (AC), (BC) lines that intercept the surface in three points M1, M2, M3. We have Vector(M1A) = k1 * Vector(M1B) Vector(M1C) = k2 * Vector(M1A) Vector(M1B) = k3 * Vector(M1C) Show that k1*k2*k3=1. Thanks!

    asked by Al
  77. biology

    is heat capacity the same as specific heat capacity?

    asked by michelle
  78. AP>PHYSICS<>please help!

    If you have 4 points on a plane you can join them all with non-crossing paths, its possible. But if you try 5 points it seems like you cant do it. Prove that it doesn't work using Euler's equation. There's 5 vertices, 9 edges and 6 faces.

    asked by MURKA
  79. math

    -5y-9=-(y-1) I combined like terms and I divided -8/-4. I got 2. Is this right?

    asked by paul
  80. powerpoint

    how do you type your name on the bottom of one of the slides? Which format do you use?

    asked by anonymous
  81. chemistry

    what are the van der waals coefficients (a and b) for nitrogen?

    asked by Rebekah
  82. powerpoint

    how can I create a fireworks display on the last slide of my presentation?

    asked by anonymous
  83. Math

    Find the domain and range y=x^2-3x+8. Explain how you found the domain and range.

    asked by Alexandra
  84. marriage of figaro

    does mozart compose the music in the opera in such a way that he puts the nobility as above the peasantry?

    asked by JJ
  85. Mathematics

    A class writes the equation n+n+1+n+2=87 to solve the following problem. The sum of 3 consecutive odd integers is 87. Find the three integers. What error did they make? I don't know where to start. I'm confused, I need help!!! Help will be greatly

    asked by Michael
  86. science

    what type of simple machine is a lawn mower?

    asked by DuLaney,9
  87. globe school for environmental Research

    How are igneous rocks form

    asked by olivia
  88. Biology

    Could someone explain what concentration gradient is? My book doesn't give a definition, and the definitions on the web that I've found don't explain it very well.

    asked by Kiki
  89. biology

    When does DNA synthesis occur? What is meant by leading and lagging strands?

    asked by kelly
  90. language arts

    What is it called when there are four periods at the end of a sentence? I know what it means but...

    asked by Shelby
  91. Math

    (-2) and -2^2. Why are the answers different?

    asked by Ash
  92. Chem

    is 3.00 x 10^8 m/s the speed of light

    asked by Lauren
  93. riddle helf

    what weighs a thousand pounds on monday but weightless by friday??...please help

    asked by johnny
  94. science

    what is a changed variable?

    asked by Anonymous
  95. current everntc

    an someone explain the conflict between the isrealites/palestinians?

    asked by john
  96. math

    i need help with this problem:2x-y=-4 -x-y=5 when you answer this question can you plz include the steps you did to get the final answer?

    asked by asha
  97. algebra.math

    Can someone help me with this word problem. How far up a wall will an 11m ladder reach, if the foot of the ladder must be 4m from the base of the wall? Round your answer to the nearest tenth.

    asked by kim
  98. Spanish

    I need someone to read it, and check for grammar, spelling, accents, etc. Thanks in advance!!! ¡El despertador sonar en las cuatro y media de la mañana! Yo me despierto. Yo tengo que ir practicar de nadar. Mi padre es normalmente despierto también.

    asked by B D
  99. Spanish

    I need someone to read it, and check for grammar, spelling, accents, etc. Thanks in advance!!! ¡El despertador sonar en las cuatro y media de la mañana! Yo me despierto. Yo tengo que ir practicar de nadar. Mi padre es normalmente despierto también.

    asked by B D
  100. biology

    will a dialysis tube swell/expand after being immersed in a beaker of water for several hours? if so why has it swelled?

    asked by sam
  101. biology

    will a dialysis tube swell/expand after being immersed in a beaker of water for several hours? if so why has it swelled?

    asked by sam
  102. math

    HOW DO I FIND THE VALUE OF 3 AND 432?

    asked by prttyizs
  103. English 2

    what is dynamic character?

    asked by michelle
  104. Grammar

    With five gallons of gas.

    asked by puncuating sentences
  105. History

    In what ways was Constantinople a golden city?

    asked by Nazharia Zehr
  106. Social Studies

    Sultan Mehmet wanted only the walls and buildings of the city, Constantinople; but his soldiers could keep the rest. Why?

    asked by Nazharia Zehr
  107. Criminal Justice

    Create a checklist that may be provided to the officers involved in the operation so they may have a reference reminding them of what they must do to properly process a defendant in a federal investigation. The checklist should include processing

    asked by Luke Phillips
  108. art

    to make objects appear to recede into the background, your best bet would be to

    asked by martha flores
  109. Computer Science/Excel

    Here's the problem: John believes that the average American will be in debt forever. He decides to create a table that demonstrates this. He thinks that given 60 months (5 years) to get out of debt and the annual percentage rates 1-5 and 7-15 the

    asked by Denise
  110. Physics

    When is your weight normal, higher, or lower while moving up and down in an elevator?

    asked by Beth
  111. religion--verse explaining

    i think it is more profitable to look at all the attributes of spirtual malpractise in given cultures, and when we do so we find a set of oppositions that maintains remarkable consistency as a set, despite variations between cultures. can someone explain

    asked by Mark
  112. Social Studies

    I have to define the meaning of liberty. I know the basics of what it means, but I need some help to make it deeper.

    asked by pinkpolkadots7
  113. math

    where is the fraction key symbol on the key board? my problem is 3 1/8 + 4 11/12 +3 1/10 + 2 4/5

    asked by mike
  114. Reading

    What is the answer to this analogy? join:club::enroll:?

    asked by Kristen
  115. math

    3/7x+5=8. I tried to cross-mulitplied and I got 3x+35=8. I divided -27 by 3 and I got -9. Is this right?

    asked by david
  116. chemistry

    how do you read this formula: 2Au2O3

    asked by elena
  117. Price ratio

    Can any explain if the following is correct, A percentage decrease of 10% is equal to a price ratio of 0.1 is a price ratio of 0.4 equal to a a price decrease of 40 % ??? Any advice appreciated !! thanks

    asked by Lou
  118. algebra 2

    this might seem simple but i don't understand if you can please help FACTOR x^3-7x^2+14x-8 thanks for your help

    asked by Ramma
  119. Spanish-Math

    I need to be able to help my 8 year niece with her homework. I don't know Spanish. Need to have these questions translated, not answered. Can you help? Q1: Myra Compra una pecera y algo de equipo. Gasta $59 en la pecera, $125 en la bomba de aire y $38 en

    asked by Barbara
  120. French

    Why is sometimes the conjugasion for "we" is nous nous? How do I know when is nous and when is nous nous?

    asked by Miche
  121. Science 7th

    I have to create an Advertisement for Nitrogen. I am lost and have no ideas.

    asked by Kili
  122. Physics

    1. How can voltage be induced in a wire? Can someone help me figure out an answer to this? please

    asked by Michelle
  123. Physics

    How can you easily increase the magnetic field strength inside a current-carrying coil? Could someone help?

    asked by Britney
  124. History - Common Sense Thomas Paine

    Why would the colonists loyal to the British object to Thomas Paine's Common Sense?

    asked by Ro