1. Chemistry

    How much energy does it take to convert 750 grams of ice at 0 degrees Celsius to liquid water at 40 degrees Celsius? (Specific Heat of water = 4.18 J/g*C and the heat of fusion = 334 J/g)

    asked by Morgan Chemistry on May 10, 2012
  2. science

    Two ice skaters stand face to face and "push off" and travel directly away from each other. The boy has a velocity of 5 m/s and he weighs 750 N. The girl weighs 480 N. What is the girl's velocity?

    asked by Anonymous on February 10, 2019
  3. College Algebra

    The ice rink sold 90 tickets for the afternoon session, for a total of $700. General admission tickets cost $10 and youth tickets cost $6 each. How many of each kind of tickets were sold?

    asked by Key on September 3, 2017
  4. Math

    The ice rink sold 97 tickets for the afternoon session, for a total of $765. General admission tickets cost $10 and youth tickets cost $5 each. How many of each kind of tickets were sold?

    asked by Lauren on September 3, 2017
  5. Math

    The ice rink sold 94 tickets for the afternoon session, for a total of $778. General admission tickets cost$10 and youth tickets cost $7 each. How many of each kind of tickets were sold?

    asked by Lauren on September 3, 2017
  6. university of phoenix

    It has been reported that 40% of children in the United States live in homes where both parents work to make ends meet. A school administrator claimed that more than 40% of children in his school district lived in homes where both parents work to make ends

    asked by kay on September 2, 2013
  7. Environmental Science

    only 10 percent of the energy is passed from one trophic level to the next. Explain where the other 90 percent of the available energy goes. Thank you for using the Jiskha Homework Help Forum BUT we are here to HELP you not to DO the work for you. It is

    asked by Qiayamah on December 22, 2006
  8. science

    i need to rearrange the following equations, to make x the subject . r = sx^2 2t and 6y = 9 – 3x can some 1 help me im realy stuck. i need to work it out step by step. the 2t is meant 2 be under sx^2 meaning dived by r= sx^2/2t multipy both sides by 2t

    asked by katie on April 21, 2007
  9. math

    can you please check my work. The time in minutes that it took five students to complete the math test was 45, 27, 30, 25, and 48. What is the mean absolute deviation of the times? I did 25+27+30+45+48= 175 then I divided it by the 5 students. 175/5= 35 so

    asked by sara on April 2, 2016
  10. accounting

    Y company offers its customers credit of 2/10,n 30. Most customers take advantage of the cash discount, mailing their payment to arrive on the 10th day following the date of the invoice. However X comany, Y largest customer, has recently begun sending

    asked by natyyyy on April 27, 2011
  11. Math

    In a special local election, one candidate received 288 votes less than twice the number of votes of the opponent. How many votes did each candidate receive if the total number of votes in the election is 136,395?

    asked by Cole on February 12, 2010
  12. physics

    A child pulls a wagon by the handle along a flat sidewalk. She exerts a force of 80.0 N at an angle of 30.0 above the horizontal while she moves the wagon 12 m forward. The force of friction on the wagon is 34 N. Calculate the mechanical work done by the

    asked by Rosie on October 28, 2014
  13. apply skills and rules improving your writing

    Ten years ago, you started working as a clerk for DMD Medical Supplies. Six months ago, Liz Jakowski, the human resources director, promoted you to office manager. You manage two employees: Jack Snyder and Ruth Disselkoen. Your office provides secretarial

    asked by Sis on January 8, 2012
  14. IMPROVING WRITING

    I have noticed that in the past three months, a month after Jessica Hilo’s medical leave, there have been problems concerning Ruth and Jack’s workload. To begin with, Jessica’s duties have been temporarily reassigned to Frank and Ralph. Furthermore,

    asked by Jacqueline on December 10, 2014
  15. Algebra :( help me

    The table below shows the weekly earnings of two groups of employees working part-time at a local grocery store. GROUP A:$245, $224, $218, $295, $214, $312, $284 GROUP B:$223, $230, $310, $246, $295, $301, $215 PART A: Which measure best describe the

    asked by Alexandrea on April 11, 2013
  16. Physics (12th Grade)

    In changing the state of a system from state A to state B adiabatically the work done on the system is 322 J. If 100 cal f heat are given to the system in bringing it from state A to state B, then what will be the work done on the system in this process?

    asked by Tulika on April 9, 2012
  17. Mathematical methods

    Following completion of your weekly readings, complete the exercises in the “Projects” section on page 397 of Mathematics in Our World. You should be concise in your reasoning. For Project #1, work only equations (a) and (c), but complete all 6 steps

    asked by Debbie on December 13, 2011
  18. Civics

    When Hurricane Andrew struck Florida in 1992, many people were responsible for the safety of its citizens. Which was a primary responsibility of the federal government? Researching technology to detect future hurricanes Restoring water and electricity

    asked by Ruby :) on January 21, 2015
  19. social studies

    Sorry...one more question! A feature of the American political system NOT adopted from practice in England is: a)appeal of disputed court decisions to higher courts b) legislative control of government finaces c) local government through town meetings d)

    asked by cecilia on September 15, 2008
  20. grade 9 GEOGRAPHY

    I am doing a project on the mixedwood plains. I have written this question before but I just want to know if I am on the right track. I need to to find suggestions on how the sensitive tourist can minimize their impact on the local environment and

    asked by peyton on November 30, 2010
  21. Civics

    Lloyd enjoys deer hunting. He goes into local store to purchase a new gun. Which amendment to the Constitution ensures Lloyd's ability to purchase a new gun? 5th amendment 1st amendment 9th amendment 2nd amendment

    asked by jeje on January 6, 2015
  22. Civics

    Lloyd enjoys deer hunting. He goes into local store to purchase a new gun. Which amendment to the Constitution ensures Lloyd's ability to purchase a new gun? 5th amendment 1st amendment 9th amendment 2nd amendment

    asked by jeje on January 6, 2015
  23. Probability

    For each one of the following situations, state whether a Poisson model is a plausible model over the specified time frame. The process of arrivals of passengers to the baggage claim section of an airport The process of order arrivals at an online retailer

    asked by Jia on December 6, 2018
  24. chemistry

    A sample of argon of mass 10.4 g occupies 2100 ml at 30 oC . (i) Calculate the work done by the gas when it expands isothermally against a constant external pressure of 31.1kPa until its volume has increased by 483.1ml. (ii) Calculate the work done by the

    asked by sand on January 11, 2012
  25. physical geography

    1- A traveler leaves lima, Peru( approximately 12 degrees S Lat. And 90 degrees W. long.) at 8:00 am on Tues. Oct. 3rd and travels for 14hrs before arriving in Sydney, Australia( approx.34 degree S and 150 degrees E). what time and what day would the

    asked by mike on January 27, 2007
  26. physics

    You have designed a rocket to be used to sample the local atmosphere for pollution. It is fired vertically with a constant upward acceleration of 19 m/s2. After 23 s, the engine shuts off and the rocket continues rising (in freefall) for a while. (Neglect

    asked by Anonymous on September 19, 2010
  27. 11th grade

    1.What features make The Awakening a "local color" story? 2.What customs and beliefs of Edna Pontellier's society are significant in relation to her psychological development? 3.What attitudes and tendencies in the Creole characters does Edna have trouble

    asked by John on July 28, 2009
  28. Physics

    A tension spring opposes being stretched, but offers no resistance to being compressed (think of a slinky!). A tension spring, with an equilibrium length of 1.25 m, is suspended by one end from a ceiling at a height of 2.5 m above the ground; a mass of 100

    asked by Nick on November 26, 2016
  29. Economics

    Multiple choice 1. If the friend offers to pay you $1 five years from today, the net present value will: A)be higher than $1. B)depend upon the interest rate offered. C)be equal to zero since you don't have the dollar. D)not be important in understanding

    asked by Dina on April 11, 2010
  30. Math

    a woman drives to work and averages 70 kilometers per hour for the trip. On her trip from work to home she averages 100 kilometers per hour. What is her average speed for the round trip?

    asked by Justin on July 15, 2015
  31. Math

    when linda and martin work together painting one room, they can complete the work in 5 hours. when linda works alone it takes her 7 hours to paint the same room. how long would it take marvin to paint the room alone?

    asked by Cesar on September 27, 2015
  32. chemistry

    phsophorous trichloride and phosphorous pentachloride equilibrate in the presence of molecular chlorine according to PCl3 (g) +Cl2 (g)->PCl5 (g) Kc = 2.01 at 500k If a 1.000L reaction vessel is charged with .300 mol of PCl5(g) and allowed to equilibrate at

    asked by james on October 1, 2015
  33. English

    1. Depending on their social class, they did different kinds of work. 2. According to their social class, they did different kinds of work. 3. Based on their social class, they did different kinds of work. --------------------------------------- What is

    asked by rfvv on September 11, 2017
  34. Improving your writing

    I hope I got it this time...Is the use of my semi colons and colon correct ? For the past three months there seems to be an ever-growing problem at our company of DMD Medical Supplies: The quality of work has been poor; the morale of various employees has

    asked by Shawna on February 3, 2012
  35. Biology

    1)Which of the following is NOT a true property of water? A-Water is a good solvent dissolving a wide variety of substances. B-Water has a high ice density allowing ice to sink when present with liquid water. C-Water has strong cohesion allowing it to bead

    asked by HELP ME on January 28, 2019
  36. earth science

    "perhaps more than any other single measurement, atmospheric pressure is the best indicator of current and changing weather conditions." explain and discuss thy this statement is correct. provide some examples (hint: discuss the difference in high and low

    asked by Staci on June 14, 2011
  37. science linear equation

    A theater is presenting a program on drinking and driving for students and their parents. The proceeds will be donated to a local alcohol information center. Admission is $18 for parents and $9 for students. However, this situation has two constraints: The

    asked by Duke on October 25, 2013
  38. HSM 270

    I really need someone to explain this question to me please! Brainstorm ideas for alternative funding for the program you selected from Appendix B. Search the Internet or contact local human services organizations for ideas on obtaining nontraditional

    asked by So confused on April 1, 2010
  39. Earth Science

    i have a few questions 1)what california geologic features formed as the result of erosion by glaciers? 2)which geologic processes formed most of californias nonmetallic mineral resources? 3)an oil well is usually drilled into? 4)which of the following is

    asked by Aaron on October 30, 2008
  40. Physics

    Under what condition can a force act on an object and yet do no work on that object? A. The object moves with no acceleration. B. The object does not move. C. The net force on the object is 0. D. The force operates under constant power. E. None of the

    asked by Alex on February 13, 2009
  41. world history

    Which of the following statements is true of the Ice Age that began 150,000 years ago? A. Many humans enjoyed high levels of nutrition and long days of leisure. B. Culture varied greatly throughout the inhabited world. C. Humans didn't use highly

    asked by firedup on November 14, 2011
  42. Improving your writing Revised

    For the past three months there seems to be an ever-growing problem at our company of DMD Medical Supplies: The quality of work has been poor; the morale of various employees has been brought down; and the workflow has been uneven amongst both teams and

    asked by Shawna on February 2, 2012
  43. statistics

    The distribution of B.A. degrees conferred by a local college is listed below, by major. Major Frequency English 2073 Mathematics 2164 Chemistry 318 Physics 856 Liberal Arts 1358 Business 1676 Engineering 868 9313 What is the probability that a randomly

    asked by Bob on April 16, 2015
  44. Physics

    A vessel contains 10 kg of water and an unknown mass of ice at 0°C. The temperature of the vessel is monitored for 60 minutes. During the first 50 minutes, the temperature remains at 0°C. For the next 10 minutes, the temp steadily increases from 0°C to

    asked by Megan on December 8, 2011
  45. Chemistry

    the heat of fusion water is 335J/g,the heat of vaporization of water is 2.26kJ/g, the specific heat of water is 4.184J/deg/g. how many grams of ice at 0 degrees could be converted to steam at 100 degrees C by 9,574J

    asked by Randy on April 27, 2012
  46. Calculus

    I would like to know if my answers are correct: Disclaimer: We are allowed to keep our answers in formula form 1. Use the washer method to find the volume of the solid that is generated by rotating the plane region bounded by y=x^2 and y = 2-x^2 about the

    asked by Daisy on January 16, 2017
  47. Probability

    I need help with this math question. Probability. In a poll, respondents were asked whether they were planning to vote in the local election. 475 respondents indicated that they were planning to vote and 496 said that they were not. What is the probability

    asked by AJC on July 23, 2010
  48. On the first three downs, the local high school fo

    On the first three downs, the local high school football team had the following gains and losses: 6 yard gain, 10 yard loss, and a 12 yard gain. What is the total gain or loss, and did they manage to get another set of downs?

    asked by Anonymous on August 4, 2013
  49. LOGICAL PUZZLE

    On the first three downs, the local high school football team had the following gains and losses: 6 yard gain, 10 yard loss, and a 12 yard gain. What is the total gain or loss, and did they manage to get another set of downs?

    asked by DIANE on May 4, 2013
  50. Algebra

    Joylin receives a $50 gift card for the local movie theater for her birthday. She uses the card to purchase tickets and snacks for her family. If Joylin spends $6 more on tickets than she does on snacks, how much does Joylin spend on tickets?

    asked by Kelly on July 3, 2014
  51. Math

    The local zoo has 3 lions, 4 elephants, 2 giraffes, 5 monkeys, and 2 zebras. What is the ratios of zebras total animals. Answer: I counted the total number of animals which is 16 so I got 2 zebras to 16 animals or 2:16 or 2/16 Do I need to do anything else

    asked by Matt on September 14, 2016
  52. Math

    i) Predict whether the functions in each pair are equivalent by testing three different values of x. (3 marks each - show your work) ii) Determine whether the functions in each pair are equivalent by simplifying the expression on the right side. (2 marks

    asked by Alex on January 8, 2015
  53. english

    Identify which one of the following sentences contains an unnecessary comma. Please correct the error and explain why the correction is necessary. a. I must have been completely absorbed in my work, because I totally forgot about the meeting. b. Because I

    asked by cathy on October 5, 2012
  54. Math

    i) Predict whether the functions in each pair are equivalent by testing three different values of x. (3 marks each - show your work) ii) Determine whether the functions in each pair are equivalent by simplifying the expression on the right side. (2 marks

    asked by Alex on January 9, 2015
  55. Eng095

    Identify which one of the following sentences contains an unnecessary comma. Please correct the error and explain why the correction is necessary. A. I must have been completely absorbed in my work, because I totally forgot about the meeting. B. Because I

    asked by Yonaa on October 27, 2011
  56. math

    jamie is saving money to buy a cd player that will cost $58, including tax. she has already saved $16. she can earn $6 per hour doing yard work. how many hours will jamie need to work to earn enough money to buy the cd player?

    asked by Melanie on February 1, 2012
  57. english

    . Identify which one of the following sentences contains an unnecessary comma. Please correct the error and explain why the correction is necessary. a. I must have been completely absorbed in my work, because I totally forgot about the meeting. b. Because

    asked by Aran on October 15, 2011
  58. math

    Erica started her own pizza restaurant. She offers one type of crust, one kind of sauce and 6 different toppings: sausage, pepperoni, mushroom, onions, green peppers and tomatoes. 1. How many different two-topping pizzas can she make? 2. Erica decides to

    asked by charlie on February 20, 2016
  59. physics

    You and your friend, both of mass 70 kg, are playing catch with a frisbee on frictionless ice. Initially, you are both at rest. You throw a 0.175 kg frisbee at 10 m/s horizontally at your friend, who catches it. After they catch the frisbee, what is the

    asked by HELP ME...uRGENT! on April 2, 2013
  60. Physics

    a 60 kg person falls off a 15 kg sled moving at 2 m/s. The person doesn't move after falling. Assuming no friction with the ice, and not other net forces acting on the sled, what is the change in velocity of the sled after the person falls off.

    asked by Sophie on December 16, 2010
  61. physics

    You and your friend, both of mass 70 kg, are playing catch with a frisbee on frictionless ice. Initially, you are both at rest. You throw a 0.175 kg frisbee at 10 m/s horizontally at your friend, who catches it. After they catch the frisbee, what is the

    asked by rohit on April 1, 2013
  62. physics

    Two skaters, one with mass 62 kg and the other with mass 45 kg, stand on an ice rink holding a pole of length 10 m and negligible mass. Starting from the ends of the pole, the skaters pull themselves along the pole until they meet. How far does the 45 kg

    asked by Jason on November 1, 2011
  63. English 10th grade

    "Well that's sculpture, making a '74 Toyota look like a '63 Corvette, only I didn't think of it that way...I was doing good work, and I was making good money." What is the purpose of the ellipsis (...)? I have it down to two possible answers: A. to prepare

    asked by Jim on December 3, 2014
  64. Physics please help

    Starting from rest, a 5.00 kg block slides 2.50 m down a rough 30.0 degree incline. The coefficient of kinetic friction between block and the incline is .436. Determine the work done by the friction force between block and incline and the work done on the

    asked by Dee on October 12, 2011
  65. Maths ( urgent help )

    20 men can do a piece of work in 24 days. After working for 6 days, an additional number of men are taken to finish the work in 21 days from the beginning. Find the number of additional men . . . I tried using variation method but the answer didn't come

    asked by mark on October 21, 2015
  66. Physics

    Starting from rest, a 5.00 kg block slides 2.50 m down a rough 30.0 degree incline. The coefficient of kinetic friction between block and the incline is .436. Determine the work done by the friction force between block and incline and the work done on the

    asked by Dee on October 12, 2011
  67. Physics

    Starting from rest, a 5.00 kg block slides 2.50 m down a rough 30.0 degree incline. The coefficient of kinetic friction between block and the incline is .436. Determine the work done by the friction force between block and incline and the work done on the

    asked by Dee on October 13, 2011
  68. math

    It certainly pays to check your work! I just took a HUGE science test. I checked it over twice before I turned it in, and got an A! My score was 94 out of 100! I figure that each time I checked it, I found half of the mistakes that were there at the time.

    asked by lexis green on May 21, 2012
  69. English

    Thank you for your corrections. Can you please check the grammar in the following letter, please? 1) Do you think you can help me find a school in your area which could be interested in an e-mail correspondence with our school? It is a high school with an

    asked by Franco on November 3, 2010
  70. math

    •You and three (3) of your friends were in the same advance placement high school chemistry class in high school. All four (4) of you decided to take the same chemistry class together at the local university along with 21 other students. On the first

    asked by jacque on December 4, 2012
  71. Math

    Define variables and write a system of equations for this situation. Solve using substitution. Suppose you want to join a video store. Big Video offers a special discount card that costs $9.99 for one year. With the discount card, each video rental costs

    asked by Angie on April 1, 2009
  72. Cultural Diversity

    I am working on an autobiographical research paper that analyzes the influences of race as it relates to your community. Can someone please answer a few of the following questions to help me with different openions on the subject? Thank you! Do members of

    asked by Russell on December 30, 2006
  73. Calculus

    Evaluate using integration by parts, substitution, or both if necessary. the intergral of cos 2x ln(sin 2x) dx My work: w= sin2x dw= 2cos2xdx 1/2 dw= cos2xdx 1/2 integrsl sign ln(w)dw u= lnw u'= 1/w v= w v'=1 1/2 [(lnw)(w)- integral sign (1/w)(w) dw] 1/2

    asked by Anonymous on November 5, 2015
  74. Health

    Devon and Hunter have been going to the local skateboard park for several weeks and learning new tricks on their skateboards. Some of the older skaters at the park have been giving them tips to be successful. To increase the amount of time Devon stays on

    asked by Jenna on January 28, 2014
  75. 8th Grade English

    My teacher for my english class at school marked off for these questions and said I could redo it and turn it in tomorrow. I am for sure I did these right. Here are the questions. Underline the verb in the parentheses that agrees with the subject. 1. In

    asked by Katie on December 11, 2012
  76. CULTURAL COMMUNICATION

    Your manager at work has advised you that you and two of your coworkers will be visiting a branch of your company in another country. Select a country that you would like to learn more about. Then, conduct an Internet or library search regarding the

    asked by JOHN on August 25, 2007
  77. Literature / Language Arts

    Think about the work you completed in your reading character role. Determine the ideas that would be most worthy to share in a literary discussion about Johnny Tremain. Provide an explanation for your choices. How did the role you selected and the work you

    asked by ? on December 19, 2015
  78. Physics

    Early one October, you go to a pumpkin patch to select your Halloween pumpkin. You lift the 2.8 kg pumpkin to a height of 1.4 m, then carry it 50.0 m (on level ground) to the check-out stand. Calculate the work you do on the pumpkin as you lift it from the

    asked by Alan on March 15, 2011
  79. Calculus

    If the work required to stretch a spring 1 ft beyond its natural length is 6 ft-lb, how much work is needed to stretch it 6 in. beyond its natural length?

    asked by Ryan on December 4, 2011
  80. Math

    Hi. Im trying to figure out how to solve an equation for x. The equation is y=2(x-3)^2. If I were to work this out, I would have come up with the answer x=sqrt y/2 +3 but the answer is actually x=sqrt 2y/2 +3. I can't work out where the extra 2 has come

    asked by oscar on November 20, 2009
  81. Math

    578 of 850 employees work directly with guests what percentage of employees work directly with guests

    asked by J on November 19, 2012
  82. math

    13 out of 25 college students work at part-time jobs. What percent work at part-time jobs?

    asked by sw on April 12, 2009
  83. Math

    My friend works 36 hours a week at her job. I work 75% of the time she works. How many hours a week do I work? Please help. Thank you!

    asked by LaM0W on December 17, 2018
  84. math

    Fifteen people working at the same rate would complete some work in 10 days. How many days would 6 people need to complete the same work?

    asked by kiko on January 9, 2015
  85. AP calc

    If the work required to stretch a spring 2 ft beyond its natural length is 6 ft-lb, how much work is needed to stretch it 18 in. beyond its natural length?

    asked by Sam on February 20, 2015
  86. Lang. Arts

    Rewrite using commas. When you balance on a skateboard there are three forces at work. I wrote... When you balance on a skateboard, there are three forces at work.

    asked by Cassie on February 19, 2013
  87. Physics. PLEASE HELP!!

    Two ice skaters hold hands and rotate, making one revolution in 7.6 s. Their masses are 15 kg and 50 kg, and they are separated by 4.6 m. Find the angular momentum of the system about their center of mass. Answer in units of J · s Find the total kinetic

    asked by Amber on April 23, 2012
  88. Science

    The amount of friction exerted when an object moves across a surface depends on how the object and the surface rub together. For which of these surfaces will friction be greatest when a block of wood slides across it? a)wet ice; b)glass mirror; c)thick

    asked by Micaela on January 11, 2012
  89. Physics. PLEASE HELP!!

    Two ice skaters hold hands and rotate, making one revolution in 7.6 s. Their masses are 15 kg and 50 kg, and they are separated by 4.6 m. Find the angular momentum of the system about their center of mass. Answer in units of J · s Find the total kinetic

    asked by Amber on April 25, 2012
  90. science

    A drinking glass at a crime scene contains a clear colorless liquid that may be water or alcohol. As the investigator, you know that the densities of alcohol, water, and ice are 0.79g/mL, and 0.92/mL. Design a simple method to determine the identity of the

    asked by Brianna on September 16, 2014
  91. Science

    which of the following is an example of a chemical change? A)Iron changes when heated B)Gas bubbles form in boiling water C) Balls of wax form when melted wax is poured into ice water. D)A gas forms when vinegar and baking soda are mixed My Choice D

    asked by Appreciated Help on September 30, 2015
  92. Physics ~Conservation of Energy~ part 2

    1.) A 500 kg roller coaster is pulled to the top of a hill 45 m high and arrives at the top with a zero speed. a) how much work has done by the vhain to pull the car to the top? b) how much potential energy does it have at the top? c)What is the total

    asked by Isis on January 30, 2013
  93. Physics

    Jack rides his 213kg motor cross bike 25.3m up a 30.0 degree slope at a constant speed. what is the energy his bike expends if the frictional force opposing its movement is one-tenth its weight? Are you sure the mass is 213 kg? Shouldn't it be 21.3 kg? Or

    asked by Jarin on August 3, 2007
  94. Literature

    Need help with this activity: 'Look around your community's sidewalks, streets, transportation system, and public buildings. How easily can a person with a disability get around? Write a letter to the editor of your local newspaper expressing your views

    asked by mysterychicken on December 28, 2009
  95. Physics

    Ignorant of the local custom of offerings strangers outrageous prices and then negotiating down, the clothing maker accepts the initial price 400 tepizes/m^2. The price of this cloth in New York is 120 dollars/yard^2. If the clothing maker bought 500 m^2

    asked by Kelly on January 18, 2011
  96. Scienc

    The dissolution of ammonium nitrate in water changes the temperature of water from 21C to - 1C(ice). If the molar enthalpy of ammonium nitrate is 25.7kj/mol. Determine the mass of ammonium nitrate that was dissolved

    asked by Marc on May 23, 2016
  97. English

    Bobpursely, thank you for helping me! Our project involving three schools is about biodiversity in water. In particular, participating students will have to carry out a chemical and microbiological analyses of water in each school's local area : river

    asked by Henry2 on February 2, 2012
  98. Science

    Bobpursely, thank you for helping me! Our project involving three schools is about biodiversity in water. In particular, participating students will have to carry out a chemical and microbiological analyses of water in each school's local area : river

    asked by Henry2 on February 2, 2012
  99. Chemistry

    Calcium chloride has been used to melt ice from roadways. Given that the saturated solution is 32% calcium chloride by mass, estimate the freezing point. Express your answer in degrees Celsius. Assume that calcium chloride behaves ideally in solution.

    asked by Frank on September 14, 2010
  100. ap chemistry

    Consider the specific heats H2O(s) =2.09 J/g ¡¤◦C,H2O (§¤) = 4.18 J/g ¡¤◦C, and H2O(g) = 2.03 J/g ¡¤◦C. The heat of fusion for water is 334 J/g and its heat of vaporization is 2260 J/g. Calculate the amount of heat required to convert 92 g of

    asked by gabriella on October 22, 2013