Bridget

Most popular questions and responses by Bridget
  1. ap chemistry

    Carbon monoxide reacts with oxygen to form carbon dioxide by the following reaction: 2CO2 + O2 yields 2CO2 Delta H for this reaction is -566 kJ/mol run. What is the delta H for CO? 1). +270 kJ/mol 2). -110 kJ/mol 3). +65 kJ/mol 4). -405 kJ/mol 5). -65

    asked on October 18, 2012
  2. Chemistry

    The cell diagram for the lead-acid cell that is used in automobile and truck batteries is Pb(s) l PbSO4 (s) l H2SO4 (aq) l PbO2(s), PbSO4(s) l Pb (s) where the comma between PbO2 (s) and PbSO4 (s) denotes a heterogeneous mixture of the two solids and the

    asked on February 23, 2014
  3. Math

    Hey guys! Just asking for some quick help. In ABC , A is a right angle, and B = 45 degrees. What is the length of BC? If the answer is not an integer leave it in simplest radical form. The diagram has 11ft listed as height of the tall side Answers: 11ft 11

    asked on May 25, 2018
  4. Chemistry

    Given these standard reduction potentials at 25 C 1. Cr3+ + e- ===> Cr2+ E1=-0.407 V 2. Cr2+ + 2e- ===> Cr(s) E2=-0.913 V determine the standard reduction potential at 25C for the half-reaction equation Cr3+ + 3e- ===> Cr(s) E=? When I tried, I got 1.08V

    asked on February 23, 2014
  5. Chemistry

    I wrote the balanced equation for cream of tartar and baking soda: NaHCO3+KHC4H4O6->KNaC4H4)6+H2CO3 I identified the conjugate acid base pairs: NaHCO3 and H2CO3, KHC4H4O6 and KNaC4H4O6 I wrote a balanced equation for carbon dioxide gas and water:

    asked on November 30, 2015
  6. math

    a sample consists of the following n =6 scores: 2, 7, 4, 6, 4, and 7 compute the mean and standard deviation for the sample

    asked on February 16, 2015
  7. Chemistry

    What is the empirical formula of a molecule containing 65.5% carbon, 5.5% hydrogen, and 29.0% oxygen? -I found this to be C3H3O and WebAssign says it's right. I need help with part b. If the molar mass of the above compound is 110 grams/mole, what is the

    asked on January 11, 2015
  8. Chemistry

    Hi, This is a challenge question for my intro chemistry class and I'd really like to do it. Its in 2 parts. 1. Consider a 2790-lb automobile clocked by law-enforcement radar at a speed of 85.5 mph (miles/hour). If the position of the car is known to within

    asked on October 1, 2013
  9. Chemistry

    Please help me out! Gas law homework! How many liters of HCl (g) at STP can be produced from 5.44 g of Cl2 and excess H2 according to the following equation? H2 (g) + Cl2 (g) --> 2 HCl (g) Thank you so much in advance.

    asked on May 28, 2013
  10. chemistry

    My teacher went over it really fast and now I'm just really confused about how to do my homework =( Calculate the cell potential for the following reaction as written at 25C, given that [Cr2+] = 0.821 M and [Ni2+] = 0.0190 M. Cr(s) + Ni2+ (aq) Cr2+ (aq) +

    asked on February 23, 2014
  11. Math

    Suppose there are 400 students in your school class. What class rank is the 20th percentile?

    asked on March 28, 2012
  12. clinical chem

    How many grams of hydrated MgSO4 ⋅ 5 H20 (M.W.: MgSO4 = 119, H20 = 18) are required to make a 10% solution of MgS04

    asked on January 22, 2018
  13. Differential equations in Calculus...plsssss help?

    Suppose that represents the temperature of a cup of coffee set out in a room, where T is expressed in degrees Fahrenheit and t in minutes. A physical principle known as Newton’s Law of Cooling tells us that dT/dt = -1/15T+5 15T + 5. a) Supposes that T(0)

    asked on November 30, 2014
  14. Chemistry-Acids

    Write a balanced chemical equation to show the reaction that occurs when each weak acid reacts with water. (Omit states-of-matter from your answer. Use the lowest possible whole number coefficients.) (b) HCHO2 I've gotten a and c correct, and from that I

    asked on May 3, 2015
  15. History

    1) Which best describes the difference that divide Maayan and Muhammad? A. Age and interest B. physical barriers C. Culture and politics *** D. Economic status 2) How does Maayan most directly experience the conflict in Israel? A. Through treating victims

    asked on February 18, 2015
  16. chemistry

    15ml of 0.325M NaOH is delivered into 35ml HOBr solution of unknown concentration.The pH of the final solution is 7.48. Ka for HOBr is 2.0 x 10-9at 25C. Find the number of moles of OBr- and HOBr in the final solution.

    asked on February 24, 2011
  17. Chemu

    Hi! I need help with my Chem homework. "When acetylene, C2H2, burns, how many liters of O2 at STp are used for every mole of acetylene burned?" (Balanced equation: 2 C2H2 + 5 O2 --> 4 CO2 + 2 H2O)

    asked on May 28, 2013
  18. physics

    what is the magnitude of the resultant of a 6.0n force acting vertically upward and a 4.0n force acting horizontally

    asked on January 1, 2013
  19. science

    What is considered the main trunk of the respiratory system? Since this is not my area of expertise, I searched Google under the key words "'respiratory system' main trunk" to get these possible sources: http://en.wikipedia.org/wiki/Respiratory_system

    asked on May 19, 2007
  20. physics

    A cowboy at a ranch fills a water trough that is 1.5 meters long, 65 cm wide and 45 cm deep. He uses a hose having a diameter of 2 cm, and the water emerges from the hose at 1.5 m/s. How long does it take the cowboy to fill the trough?

    asked on November 11, 2010
  21. ap chemistry ! i am so lost

    how much work is done by the system when 2.00 moles of O2 expand from a volume of 3.00 liters to a volume of 5.8 liters against a constant external pressure of 0.0100 atm? answer in units of J

    asked on October 18, 2012
  22. math

    If light bulbs have lives that are normally distributed with a mean of 2500 hours and a standard deviation of 500 hours, what percentage of light bulbs have a life less than 2500 hours?

    asked on April 2, 2012
  23. Calculus with Diffrential Equations: Pleease help?

    Suppose that represents the temperature of a cup of coffee set out in a room, where T is expressed in degrees Fahrenheit and t in minutes. A physical principle known as Newton’s Law of Cooling tells us that dT/dt = -1/15T+5 15T + 5. a) Supposes that T(0)

    asked on November 30, 2014
  24. MATH##$$&&^^**

    A researcher wishes to estimate the proportion of college students who cheat on exams. A poll of 490 college students showed that 33% of them had, or intended to, cheat on examinations. Find the margin of error for the 95% confidence interval.

    asked on April 20, 2012
  25. ap chemistry ! i am so lost

    how much work is done by the system when 2.00 moles of O2 expand from a volume of 3.00 liters to a volume of 5.8 liters against a constant external pressure of 0.0100 atm? answer in units of J

    asked on October 18, 2012
  26. Calculus

    Suppose that represents the temperature of a cup of coffee set out in a room, where T is expressed in degrees Fahrenheit and t in minutes. A physical principle known as Newton’s Law of Cooling tells us that dT/dt = -1/15T+5 15T + 5. a) Supposes that T(0)

    asked on November 30, 2014
  27. math

    2-2A #2 Rewrite the following using mathematical symbols: a. P is equal to the set containing a, b, c, and d. b. The set consisting of the elements 1 and 2 is a proper subset of {1, 2, 3, 4} c. The set consisting of the elements 0 and 1 is not a subset of

    asked on July 12, 2010
  28. Math

    Suppose that we wish to seat ten people, 5 men and 5 women, in a row of ten chairs. In how many ways can we seat the people with no restrictions?

    asked on May 6, 2014
  29. math

    Find the slope of the lines that are (a) parallel lines (b) perpendicular lines to the lines passing through the pair of points (3, 4)(2,-1)

    asked on November 4, 2013
  30. MATH

    A mean score on a standardized test is 50 with a standard deviation of 10. Answer the following a. What scores fall between –1 and +1 standard deviation? b. What percent of all scores fall between –1 and +1 standard deviation? c. What score falls at +2

    asked on April 3, 2012
  31. Statistics

    About 13% of the population is left handed. If two people are randomly selected what is the probability that both are left handed?

    asked on July 4, 2017
  32. Physics Electric Circuits

    3. A 15.0 ohm resistor is connected in series to a 120 V generator and two 10.0 ohm resistors that are connected in parallel to each other. b) What is the current through the 15.0 ohm resistor? c) What is the current through one of the 10.0 ohm resistors?

    asked on May 7, 2015
  33. Math

    If two fair dice are rolled, what is the probability that a total of five shows?

    asked on May 6, 2014
  34. English

    In which sentence is an a homonym used correctly? 1. Karen's new dog had flees. 2. If you ask me , there's no hobby like fishing. 3. How many ours do we have to wait. 4. We had chocolate ice cream for desert.

    asked on May 2, 2012
  35. Math

    to the nearest hundred, what is the greatest whole number that rounds to 2,500? the least whole number?

    asked on August 22, 2016
  36. math

    Find the slope of the lines that are (a) parallel lines (b) perpendicular lines to the lines passing through the pair of points (3, 4)(2,-1)

    asked on November 4, 2013
  37. Chem 112

    Calculate the pH of a buffer solution prepared by dissolving 0.12 mole of cyanic acid, HCNO and 0.65 mole of sodium cyanate, NaCNO in enough water to make 1.0 liter of solution. [Ka(HCNO) = 2.0 × 10-4] I know that this question has something to do with

    asked on March 21, 2011
  38. Math

    Could someone please help me? calculate the volume in cu. ft of a section of drainage pipe that measures 8 feet in lenght and 24 inches in diameter (all measurements has to be in the same units and be careful that you distinguish between diameter and area

    asked on February 22, 2007
  39. english

    During the storm, Jenna hid in her basement

    asked on February 2, 2015
  40. economics

    How can you use information about the business cycle when making a decision about a large purchase?

    asked on March 31, 2010
  41. Physics

    what must be the net force if a 19.9 kg mass accelerates to the left at a rate of 2.2m/s^2?

    asked on September 8, 2016
  42. geometry

    I had to complete the following solution by filling in the missing statements and reasons. I filled out the statements, but am having trouble wording the last two reasons. Following solution: x-2(3x-4)=18 Statement: x-2(3x-4)=18 Reason: Given Statement:

    asked on April 18, 2015
  43. Dma 040

    v =1/3ah, solve for h

    asked on September 30, 2013
  44. business

    A women has $500,000 invested in two rental properties. One yields an annual return of 14% on her investment, and the other returns 9% per year on her investment. Her total annual return from the two investments is $52,000. How much is invested at each

    asked on September 20, 2011
  45. business law

    Beta Company arranges to have Carrier Corporation transport five hundred DVD players from New York to California. Dan is Carrier's driver. Beta will suffer the loss if Carrier fails to deliver the players on time because?

    asked on October 22, 2009
  46. math

    Samantha was playing a fraction game where she could earn either positive or negative points on each turn.The lowest score she ever recorded was -26 2/3. The highest score was 8 3/4. Which. What expession represents the distance on a number line between

    asked on December 16, 2014
  47. Art

    Eugene Delacroix's Liberty leading the people commemorated?

    asked on January 31, 2014
  48. math

    Write equation in Standard Form Ax + By =C (-9, 7)(0, 3)

    asked on November 4, 2013
  49. math

    Write an equation of the line with the given slope and containing given points. Slope intercept form Slope 4 through (-3, 3)

    asked on November 4, 2013
  50. dma040

    v=1/3ah solve for h

    asked on September 27, 2013
  51. math

    what are situation and solution equations? example question is: People in a marching band stand in 8 equal rows. There are 56 people in the band. How many people are in each row?

    asked on October 13, 2010
  52. Statistics

    Sample salaries (in dollars) of high school teachers are listed. Find the sample mean and standard deviation of the data. 49,632 54,619 58,298 48,250 51,842 50,875 43,219 49,924

    asked on February 13, 2010
  53. Chemistry 101

    How do I find the mass % of Oxygen in sodium oxide?

    asked on September 26, 2009
  54. 8th Grade Algebra

    Multiply. 1) (3t^2 - 2t - 4) * (5t + 9) Writing. 1) Explain why the product of a quadratic polynomial and a linear polynomial must be a cubic polynomial.

    asked on May 5, 2009
  55. Com 220 creative writing

    Quoting, Summarizing and paraphrasing sources for sexual assaul base on college dringking

    asked on February 1, 2009
  56. algebra/math

    i know this is probably a really simple answer and i'm gonna want to hit my head on a wall after i get it, hopefully, but how would i find a unit rate and then simplify it, if possible? like, 3 pages/5 hours? like the directions just say to write as a rate

    asked on August 23, 2007
  57. arithmetic

    In Jullian's garden, there are 3 rows of carrots, 2 rows of string beans,and 1 row of peas. There are 8 plants in each row. How many plants are there in all?

    asked on November 19, 2014
  58. Statistics

    According to a national poll conducted in 2010, seventy percent of teens reported having sent or received a text message while driving. Assume that I randomly survey 14 teens and asked them whether or not they have sent or received a text message while

    asked on October 27, 2014
  59. statistics

    population has mean 53 and standard deviation 12. Calculate the standard deviation of x bar for a random sample of size 12.

    asked on August 18, 2014
  60. Math

    Determine the equation of g(x) that results from translating the function f(x) = (x + 10)^2 to the right 12 units.

    asked on December 16, 2013
  61. math

    1.graph equation y=4/5x 2.graph linear equation y=-1 3.find the slope of line -2x - 3y = 5 a. slope is b. slope is undefined?

    asked on October 15, 2013
  62. dma040

    Police officer to Speedzilla he was speeding at or above 120 miles per hour. Write an inequality to express Speedzilla speed, then show in graph, write in set notation.

    asked on October 7, 2013
  63. dma040

    Solve for x. 13/14x + 8/7 = 6/7x

    asked on October 7, 2013
  64. dma040

    Explain which terms are alike 7xy -9x^2 -15xy^2 -14xy

    asked on October 7, 2013
  65. math

    how can i find the GCF of a pair of numbers ? (ie 11 18, 8 6)

    asked on January 3, 2011
  66. math

    how to know exponent ?

    asked on July 12, 2010
  67. math

    Bob is framing a rectangular picture 9 in long and 6 in wide. If the framing material costs $1.50 per inch, what will be the total cost of the frame?

    asked on June 26, 2010
  68. Finance

    I am trying to figure out how to compare long-and short-term financingand then describe situations in which each type of financing would be used.

    asked on May 21, 2010
  69. Economics

    o Which government bodies influence national fiscal policies that potentially affect the housing market? I am thinking the federal reserve but I am really unsure about that answer.

    asked on April 6, 2010
  70. vocab

    write a sentences for brother's and brothers

    asked on March 31, 2010
  71. math

    how do i factorise a)9a^2-b^2 b)3x-8y-4xy+6

    asked on April 15, 2008
  72. History!!!!!

    so i have to write a closing argument paper about the whole thing with the Numberburg trial and I have to write a closing statement acting as a lawyer trying to defend and say the germans should of not been prosicuted so go the opposite and most people

    asked on March 21, 2007
  73. Macroeconomics

    Since all economies are faced with scarcity, how might nations attempt to minimize the human hardship associated with scarcity? By setting up some system that transfers resources from the haves to the havenots. E.g., issue food stamps, build low-income

    asked on March 21, 2007
  74. History!!!

    What are several reasons why there is no such thing as a war crime??? The concept is esoteric. In practice, the winner in war gets to decide what it is and who will be punished. Look up esoteric: That definition probably answers your question. This site

    asked on March 18, 2007
  75. probability and Stats

    How can I find standard error from each of the following: a) a proportion & a sample size? b) mean, standard deviation, and sample size? c) mean & standard deviation? thank you

    asked on October 31, 2016
  76. Probability and Stats

    A student was totally unprepared for a multiple-choice test and had to absolutely guess the answer to every one of the 100 questions. About what score (percent) would you expect him to earn if there were four possible answers to every question? I'm not

    asked on October 25, 2016
  77. english

    What do adverbs modify?

    asked on March 9, 2016
  78. Physics Grade12

    two balls are juggled so that each ball is in the air for 1.800s, and the second ball is thrown up at the instant the first starts down. Find the height above the throwing hand where the two balls pass eachother, assuming gEarth=9.800m/s^2 I started with

    asked on February 25, 2016
  79. science

    what is a vector?their structure?

    asked on March 11, 2015
  80. Chemistry

    A chemical formula shows the types and __blank__ of atoms in the smallest representative unit of a substance.

    asked on October 30, 2014
  81. Math

    If two dice are rolled, what is the probability that a total is showing more than four

    asked on May 6, 2014
  82. Math

    If two fair dice are rolled, what is the probability that a total of five shows?

    asked on May 6, 2014
  83. life science,maths lit,geography,tourism

    is it possible 4 me 2bcum a social worker?

    asked on April 30, 2014
  84. math

    If A=3x+4 and B=x^2+2 and C=x^2+3x-2, find the following: 1. AC+B 2. (A+B)(B-C) 3. ABC

    asked on April 13, 2014
  85. math

    5 ----- 8+root7 please help me simplify

    asked on December 23, 2013
  86. Math

    Determine the equation of g(x) that results from translating the function f(x) = x2 + 5 upward 6 units.

    asked on December 16, 2013
  87. Math

    Determine the equation of g(x) that results from translating the function f(x) = x2 + 5 upward 6 units.

    asked on December 16, 2013
  88. Dma 040

    V=1/3ah, V=21,h=3, solve

    asked on September 28, 2013
  89. Dma 040

    V=1/3ah, V=21,h=3, solve

    asked on September 27, 2013
  90. Dma 040

    V=1/3ah, V=21,h=3, solve

    asked on September 27, 2013
  91. Dma 040

    Lenth of a rectangle is 7ft longer than twice the width. If the rooms perimeter is 158ft, whay are the rooms dimensions? Width Length

    asked on September 27, 2013
  92. dma040

    A number subtracted from 13 is the quotient of -34and 2. Find the number

    asked on September 27, 2013
  93. math

    suppose that you roll a pair of 8-sided dice total of 51 times. what is the probability that you will get a sum of 5 at least 3 times

    asked on September 6, 2012
  94. algerabra 1

    how do you find the equation for the line containg the side opposite the side containg the first two vertices?

    asked on June 28, 2012
  95. algerabra 1

    how do you find the equation for the line containg the side opposite the side containg the first two vertices?

    asked on June 28, 2012
  96. geometry

    Need to find the perimeter in feet... The width is 35ft and 5in The length is 10ft and 3in Need to write the answer in feet... If there is anybody that can point me in the right direction.. I know I have to convert in. into feet.. and 12in= 1 foot

    asked on December 7, 2011
  97. Geography

    Are there 7 countries in Central America?

    asked on September 19, 2011
  98. Math

    solve: (square root of 3) sin(theta) + cos(theta) = 1 Thanks! :)

    asked on October 21, 2010
  99. 10th grade

    The ultimate goal of all the explorations launched by the Europeans from the fourteenth century onward was

    asked on October 14, 2010
  100. algebra

    need to write in paragraph form how to solve the expression 161/2

    asked on September 25, 2010

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