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Questions Asked on
May 12, 2012

  1. CHEMISTRY

    A Sample of gas originally at 25 degrees C and 1 atm pressure in a 2.5 L container is allowed to expand until the pressure is .85 atm and the temperature is 15 degrees C. What is the final volume of gas? Did anyone get 2.6 L

    asked by John

  2. CHEMISTRY

    A mixture of Xe, Kr, and Ar has a total pressure of 6.7 atm. What is the mole fraction of Kr if the partial pressures of XE and Ar are 1.6 atm and 2.8 atm? Did anyone get .343 ?

    asked by John

  3. Chemistry

    For the reaction below, Kp = 1.16 at 800.°C. CaCO3(s) CaO(s) + CO2(g) If a 25.0-g sample of CaCO3 is put into a 10.2-L container and heated to 800.°C, what percent of the CaCO3 will react to reach equilibrium?

    asked by Andrew

  5. chemistry

    write the steps of complete ionization of carbonic acid and hydro sulfuric acid.

    asked by ryan

  6. statistics

    a company manufactures batteries in batches of 18 and there is a 3% defect rate. Find the standard deviation for a number of defects per batch?

    asked by tara

  7. Physics

    A cannon fires a projectile into the air at an angle of 60degrees above the horizontal. The projectile falls back on the ground at a distance d from the cannon and its maximum height is h. Ratio d/h is equal to:

    asked by Zess

  8. functions

    a car is spinning at a rate of 4.3pi radians/s. how many rotations will it make in an hour?

    asked by kerry

  10. Compound interest

    Hello My teacher skipped over this and I have no clue how to do this or the equations. Help would be wonderful thank you If 6000 dollars is invested in a bank account at an interest rate of 10 per cent per year, find the amount in the bank after 15 years

    asked by someone

  11. CHEMISTRY

    Is CF4 an example of a central atom with an expanded octet?

    asked by John

  12. math problem-

    Bacteria grow in a nutrient solution at a rate proportional to the amount present. Initially, there are 250 strands of the bacteria in the solution which grows to 800 strands after seven hours. Find the time needed for the bacteria to grow to 1600 strands.

    asked by gwapa

  13. Calculus!

    Which is the standard form of the equation with p = 26, O=3pi/4 ? the O before the =3pi has a diagonal slash through it.

    asked by kelsey

  15. statistics

    8. Compare the mean for the heights of males and the mean for the heights of females in these data. Compare the values and explain what can be concluded based on the numbers. Comparing the mean of height between male and female shows that the average

    asked by jeanne

  16. ALG 2 (exponents)

    Write log'2' 8 = 3 in exponential form?

    asked by Greg

  17. Please Help:D

    Given a square, what is the locus of points equidistant from the sides?

    asked by My Name Is Bob

  18. solid mensuration

    103. A billiard ball, aimed at a point A on the edge of the cushion of a horizontal billiard table, rolls along a line making 18 degrees with the cushion. If the cushion over hangs so that its edge is 4 cm. above the table and the diameter of the ball is 5

    asked by apolonio

  20. chemsitry

    the ph of a .030M C2H5 COOH solution is 3.20. What is this acids Ka?

    asked by ryan

  21. Physics

    Vector A has magnitude 37 units and direction, counterclockwise from east, of 12.9 degrees. What is the value of its x component to 1 decimal place?

    asked by Tanner

  22. math

    A box with no top is to be constructed from a piece of cardboard whose width measures x cm and whose length measures 6 cm more than its width. The box is to be formed by cutting squares that measure 2 cm on each side from the four corners, and then folding

    asked by amanda

  23. business

    What keys or tips can raise suspicion about the validity of arguments, presented verbally and in writing? Not sure if I understand correctly...

    asked by twg

  25. Math

    A rectangular solid has a base area of 43.3 sq inches and a height of 50 inches a triangular prism has a base in the shape of an equilateral triangle and a height of 50 inches. the volumes for both shapes are equal. find the side of the equilateral

    asked by Joshua

  26. statistics

    suppose the replacement times for washing machines are normally distributed with mean 8.6 years and standard devistion of 1.6years. a. what percentage of washing machines have replacement times less than 7 years? b. find the probability that a washing

    asked by tara

  27. Algebra 2

    How would I find the sum of the geometric series given? 1/5 - 1/25 + 1/125

    asked by Greg

  28. Math

    Score Percentile Score Percentile Score Percentile Score Percentile -3.5 0.02 -1 15.87 0 50 1.1 86.43 -3 0.13 -0.95 17.11 0.05 51.99 1.2 88.49 -2.9 0.19 -0.9 18.41 0.1 53.98 1.3 90.32 -2.8 0.26 -0.85 19.77 0.15 55.96 1.4 91.92 -2.7 0.35 -0.8 21.19 0.2

    asked by Need Help!!!

  30. adv functions

    a pie is cut into 8 equel slices. if a person wants 0.75(pie sign) centimetre of crust, about how many pieces should they take?

    asked by chris

  31. CHEMISTRY

    CaC2 (s) + 2 H20 (g) -> Ca(OH)2 (s) + C2H2 (g) The complete reaction of 22.7 g of CaC2 requires consumption of ________g of H2O. I did 22.7 g CaC2* (2/64 mols CaC2) = .709 Right?!?!

    asked by John

  32. chemistry

    what is the base ionization constant expression for ammonia?

    asked by ryan

  33. Life orientation

    How smoking is a human factor tha may cause ill health,accidents,crises or disaster?

    asked by Tsakani

  35. Math 8th Grade

    I would greatly appreciate it if someone would please be kind enough to take the time and show me how to work these problems. Thank you very much Solve by finding y and graph using the slope and y-intercept: 3x-y=1(My answer -y=3x+1)which is wrong could

    asked by Please help me

  36. science

    if i use 30 ul from a total volume of 600ul to get 40ug/ml. So to get the total ug only, do i take 40ug/ml*.030ml*(600ul/30ul)=total ug

    asked by eng

  37. science

    if i use 30 ul from a total volume of 600ul to get 40ug/ml. So to get the total ug only, do i take 40ug/ml*.030ml*(600ul/30ul)=total ug

    asked by eng

  38. Math

    he number of bacteria in a culture is modeled by n(t)=1710e071t (a) The initial number of bacteria is (b) The relative rate of growth of this bacterium population is (c) The number of bacteria after 3 hours is (d) After how many hours will the number of

    asked by someone

  40. CHEMISTRY

    If 33.7 ml of 0.210 M KOH is required to completely neutralize 27.0 ml of a HC2H3O2 solution, what is the molarity of the acetic acid solution? HC2H3O2(aq)+ KOH(aq)-->KC2H3O2(aq)+H2O(l)

    asked by Michael

  41. CHEMISTRY

    A Sample of gas originally at 25 degrees C and 1 atm pressure in a 2.5 L container is allowed to expand until the pressure is .85 atm and the temperature is 15 degrees C. What is the final volume of gas? Did anyone get 2.6 L

    asked by John

  42. math

    The number of bacteria in a culture is modeled by n(t)=1710e071t (a) The initial number of bacteria is (b) The relative rate of growth of this bacterium population is (c) The number of bacteria after 3 hours is (d) After how many hours will the number of

    asked by someone

  43. Math

    If the larger of two numbers is divided by the smaller, the quotient and the remainder are 2 each. If 5 times the smaller number is divided by the larger, the quotient and the remainder are still 2 each. find the two numbers.

    asked by Arshia

  45. chemistry

    write a balanced chemical equation for the dissociation of solid magnesium hydroxide in water?

    asked by ryan

  46. Information Literacy

    1-When choosing your search strategy for a search engine, it's best to A. enter the least important word first. B. ignore alternate spellings. C. combine keywords into phrases by using quotation marks. D. use verbs, articles, and capitals My answer C 2- To

    asked by Moha

  47. Science please help!

    A lamp connected to a battery lights up. If a second, identical lamp is connected to the battery in parallel, the current drawn from the battery will _____ , and compared to the original brightness of the first lamp, both lamps will be _____ . will the

    asked by matthew

  48. Information Literacy

    1-To determine the best place to begin your online research, you should first A. identify keywords and search terms. B. formulate your research question. C. choose several verbs and modifiers to help define your search. D. settle on a single, concise

    asked by Moha

  50. us history

    Which was not one of the causes of the Great Depression? (Points : 5) excessive income taxes speculative stock purchases risky banking practices severe drought

    asked by ahmed

  51. chemistry

    write a balanced equation for the reaction between sulfuric acid and calcium metal

    asked by ryan

  52. Information Literacy

    which of the following is true regarding doing online search for information A. If your search turns up no hits, you need to use a more specific keyword B. You'll get better results if you choose a single, general keyword . C. Using one or two specific key

    asked by Moha

  53. accounting

    1.On December 15, 2012, Pascal declared a cash dividend of $2.00 per share to stockholders of record on December 31. The dividend is payable on January 15, 2013. Pascal has issued 1,000,000 shares of common stock, of which 50,000 shares are held in

    asked by ashley

  55. chemistry

    how do you write the ionization reaction and the acid ionization constant expression for the third ionization of phosphoric acid in water? Can you explain the main concepts that are involved in this?

    asked by ryan

  56. Math

    The cars in a car service use a total of gallons of gasoline per week. If each of the cars uses the same amount of gasoline, then, at this rate, which of the following represents the number of gallons used by 5 of the cars in 2 weeks? A. 10CG B. 2G/5C C.

    asked by John

  57. chemistry

    how do you identify the base in this reaction? h2o(L) + CH3NH2(aq) yields OH-(aq) + CH3+(aq)

    asked by ryan

  58. algebra

    write the following using a positive exponent, simplify the expression and simplify6^2. write using a positive exponent. do not evaluate

    asked by plz help

  60. math

    the printed matter on a 18 by 22 centimeter page of a book must cover 96 square centimeters.If all margins are to be the same width, how wide should they be?

    asked by amanda

  61. Math

    I need help atleast an equation to get started please A lab assisstant wants to make five liters of 27.8% acid solution. If solutions of 50% and 13% are in stock, how many liters of each must be mixed to prepare the solution.

    asked by Janine

  62. English - ms. sue

    ms sue i trying to find a movie, song that i compare with rosemary. i not know what movie character enter in as ray of hope and show them light in movie.

    asked by Mohammad

  63. Information Leteracy

    1) which of the folowing is true regarding doing an online search for information A- if your serch turns up no hits,you need to use a more specific keyword B- you'll get better result if you choose a single, general keyword C- Using one or two specific

    asked by Bita

  65. english language arts

    hii! so is this sentence a metaphor or a hyberbole? The cloud was a thick blanket of ashes. thanks!

    asked by Anonymous

  66. CHEMISTRY

    Are these listed in the correct order of increasing average molecular speed? NH3

    asked by John

  67. CHEMISTRY-HELP

    The electronegativities of the elements are H=2.1, O=3.5, F=4.0, S=2.5, Cl=3.0. Determine (calculate) the electronegativity diffrences for the following molecules and explain how they are arranged in the order: H2, O2, HCl, HF, H2O and position them in the

    asked by Bran

  68. 11TH Geometry

    With the image of O(-2,-1) after 2 reflections. one across the line y=-5 and line x=1

    asked by Megan

  70. Writing

    I need to write and essay answering this question but I cant find a good article. Please help. "What responsibilities does the individual play in selecting food choices? Should the individual in turn bear the full expense that the health care industry

    asked by Jeury

  71. Chemistry

    If 9.03 x 1021 molecules of a compound having general formula CnH2n+2 weigh 1.71g, what is the molar mass of the compound? Give its molecular formula

    asked by Susan

  72. math

    a pie is cut into 8 equel slices. if a person wants 0.75(pie sign) centimetre of crust, about how many pieces should they take?

    asked by chris

  73. Chemistry

    Na (s) + 1/2F2 (g) = 2NaF (s) Are the reactants at higher or lower energy than the products and is the reaction endothermic or exothermic? I feel that the reaction is exothermic, but can't determine higher or lower enery?

    asked by Bran

  75. Art and Writing Therapist

    I just have a few questions. Ok so the main point of being a Art/Writing Therapist is ...... when you talk to teenagers, children or adults about their problems in their life and you help them by writing and create art like for example when a regular

    asked by Laruen

  76. CHEMISTRY!

    Pure copper has a density of 8.933 g/cm^3. What is the volume of a 5 g block of copper? I did D=M/v Flipped the formula to V=M/D V= 5g/8.933 (g/cm^3) so that equals .56 cm^3 Right?!?

    asked by John

  77. precalculus algebra

    Diane is a manager at a small movie theater. On Wednesday, she sold twenty adult and children’s tickets. Adult tickets are $3 each. Children’s tickets are $2 each. On Wednesday, the theater made $125 from ticket sales. How many adult tickets were sold?

    asked by amy

  78. math

    the arc length and central angle of a circle are 10cm and 80degrees respectivly. what is the length of the radius?

    asked by celina

  80. English

    Hello. I will really appreciate some help. 1)Do you think it's possible and natural to use "unsuccessfully" in the following position: "They have been trying to solve the problem in the new project, but unsuccessfully"? 2)Do you think the article is a must

    asked by Ilma

  81. economics

    Movie attendance dropped 8 percent as tick prices rose a little more than 5 percent. What is the price elasticity of demand for movie tickets? Could price elasticity be some-what overestimated from these figures? That is, could other things have changed,

    asked by Ashaki

  82. Probability

    In a raffle there are four winning tickets from 12, What is the probability from six tickets there are two winners? Thank you in advance.

    asked by William

  83. chemistry

    2 questions please: The highest positive oxidation number that chlorine can exhibit an any compound is +7, whereas its most negative oxidation number is -1. Write the electron configuration of chlorine and explain why these are limiting oxidation numbers

    asked by Derrick

  85. Soanish-8th grade Help!

    I'm trying to conjugate this in the past tense tú/presentarse would I conjugate it in past tense like this- (tú te presentaste) Something looks wrong with it

    asked by Jake

  86. HELP-CHEMISTRY!

    Na (s) + 1/2F2 (g) = 2NaF (s) Are the reactants at higher or lower energy than the products and is the reaction endothermic or exothermic? I feel that the reaction is exothermic, but can't determine higher or lower enery?

    asked by Bran

  87. track and field

    is a speed of 6.5 on a tredmill for five minutes equal to a good mark for a seventh grade girl to get 67 seconds in the 4 by 400?

    asked by Kennedy

  88. algebra

    evaluate the expression. Assume h does not equal 0 h^0=

    asked by plz help

  90. Physics

    a charged particle is in point (2, 3, 8) and has a charge Q1 = 5x10-10C. Another particle is at (5,7,0) and has a charge Q2 = 3x10-10C. Calculate how much work needed to move the first particle to the point (0, -7.2) using the electric field

    asked by Filip

  91. Chemistry

    The electronegativities of the elements are H=2.1, O=3.5, F=4.0, S=2.5, Cl=3.0. Determine (calculate) the electronegativity diffrences for the following molecules and explain how they are arranged in the order: H2, O2, HCl, HF, H2O and position them in the

    asked by Bran

  92. Math

    For this problem my equation is Y=70+110e^kt but i keep getting it wrong any suggestions? A roasted turkey is taken from an oven when its temperature has reached 185 Fahrenheit and is placed on a table in a room where the temperature is 75 Fahrenheit. (a)

    asked by someone

  93. math

    The Pythagorean Theorem gives the relationship between the sides of a right triangle. The following identities show the relationships between the trigonometric functions of a particular angle. sin2 θ + cos2 θ = 1 tan2 θ + 1 = sec2 θ 1 + cot2 θ = csc2

    asked by rick

  95. solid mensuration? help.

    Window glass formerly was made by gathering a lump of molten glass on the end of a hollow rod blowing it into the form of a large hollow cylinder about 6 ft. long and 1 1/2 ft. in diameter. This was cut longitudinally and then placed in an oven and heated

    asked by sara

  96. physics

    i need three project topics in physics. Help please

    asked by Joanna

  97. math

    For this problem my equation is Y=70+110e^kt but i keep getting it wrong any suggestions? A roasted turkey is taken from an oven when its temperature has reached 185 Fahrenheit and is placed on a table in a room where the temperature is 75 Fahrenheit. (a)

    asked by someone

  98. math

    The probability that a voting-age adult in 2004 voted in the presidential election was 0.57. Five voting-age adults in 2004 were randomly selected. Find the probability that exactly 2 or the 5 adults voted in the presidential election.

    asked by Timothy

  100. managerial economics

    Some of the fields have large enough quantities of both oil and natural gas that coordination must achieved for the production of both rather than oil alone as in our examples. Will fields with both oil and gas have greater difficulties in unitization than

    asked by tip

  101. Information Literacy

    which of the following is true regarding doing online search for information

    asked by moha

  102. algebra

    evaluate 176-A^2 when A=9 176-A^2=

    asked by plz help

  103. solid mensuration

    If a match box has inside dimensions of 2 in. by 1 ¼ in. by 5/8 in., find the useful capacity of the box. The cover is made with open ends so that the box can slide into it, the fit being snug. If the match box and cover are made of thin slices of wood

    asked by xzknij

  105. Health

    At the dining halls I work out all employees must wear hats or hairnets and gloves at all times no exceptions! At all the restaurants I have ever eaten at I have never seen waiters or waitresses wear gloves or hairnets/hats ever! I feel as if this a huge

    asked by Dylan

  106. science-biology

    can anyone help me by finding which enzymes are present in carbohydrates? is it salivary amylase(tyalin)

    asked by sandra

  107. algbra 1b

    can someone tell me if i have the answer correct a. Suppose a market research company finds that at a price of p = $40, they would sell x = 27 tiles each month. If they lower the price to p = $15, then more people would purchase the tile, and they can

    asked by nell

  108. CHEMISTRY

    Determine the pressure in atm for a 10 g of CO2 sample contained in a sealed 10 L tank at 50degrees C? Did anyone get 26.5 atm?

    asked by John

  110. algebra

    evaluate the expression. Assume h does not equal 0 h^o=

    asked by plz help

  111. statistics

    A group meeting is attended by 16 delegates. (a)If a 6-person negotiation panel is selected at random from the 16 delegates, what is the probability the negotiation panel consists of 3 delegates from Atlantis and 3 delegates from Zedonia?

    asked by matt

  112. Statistics

    In 1972, there were 3.4 trillion cigarettes purchased worldwide, and in 1984, there were 4.3 trillion cigarettes purchased worldwide(in trillions) in the year x, where x=0 represents the year 1972. (a) Which of the following linear equations could be used

    asked by Kwame

  113. Math

    first three terms of a geometric sequence are the same as the 1st, 9th and 11th terms of an arithmetic sequence, respectively. What is the common ratio in the geometric sequence ? Thanks!

    asked by Matthew

  115. algebra

    what's the simplied form of (5m^-4n^2)^3

    asked by plz help

  116. algebra

    using product rule, power rule, negative rule using scientific notation. 5.4*10^6/2.7*10^4=5.4/2.7*10^6/10^4=2*10^2

    asked by plz help

  117. Health

    Writeacher, could you please check if everything is OK? Thank you very much. 1) My classmates always keep me from work (from the lesson??). I was on the phone with the bank when we were cut off. 2) I was so cross with my boss that I hung up on him.Peter

    asked by Mike

  118. Technology

    Design the defining diagram, hierarchy chart and the algorithm that will determine the percentage sales commission earned on loyalty customers' purchases from a customer file.

    asked by Devi

  120. child care management

    A teaching method that uses computers to help children learn is called ?

    asked by jennifer

  121. math

    If a^x=b^y=c^z and b^2=ac then find value of y.

    asked by Shobhit

  122. solid mensuration

    the area of the total surface of a polyhedron weighing 64 lb. is 340 sq. in. what is the surface of a similar polyhedron made of the same material and weighing 1000 lb. ? thank you!!

    asked by sara

  123. physics

    A 2630-kg car drives up a hill 769 meters high in 41.0 seconds. Calculate the power exerted

    asked by Matt

  125. Science!

    Always forms virtual images at the same distance behind the optic as the object is in front of it. I thought it was concave but im not sure if concave lens form a virtual images when its infront of the optic

    asked by matthew

  126. Algerbra

    Multiply -7/5 * (6/7)

    asked by Sue

  127. English

    Hello. I'll be very grateful if you help me with a few questions. 1)Would you use the article in the context: "he became (the?)French president", "he became (the?) president of France"? 2)Which preposition is correct in the following context: "England

    asked by Ilma

  128. English

    What punctuation is correct for this sentence? Comma or Semi-Colon? But these weren’t simply mashed; they were formed delicately by my mother’s hands But these weren’t simply mashed, they were formed delicately by my mother’s hands

    asked by Teddy

  130. solid mensuration

    104. A fly stationed at a point on the circumference of the base of a cylindrical tower of radius 12 ft. finds that he can just see a distance flagstaff by walking along the tangent line to the base either a distance 8 ft. in one direction or a distance 5

    asked by apolonio

  131. Algebra 2

    Simplify: (8x^8 y^27) ^1/3 I need a little help learning how to work this problem out

    asked by GREG B.

  132. math

    using the product rule: 5.4*10^6/2.7*10^4=5.4/2.7*10^6/10^4=2*10^2 solve plz.

    asked by plz help

  133. Math

    Bob takes 45 minutes each day for lunch. He does not get paid for the lunch break. How many hours does he work in a 5-day workweek if he checks in at 8:00 a.m. and checks out at 5:15 p.m. each day?

    asked by Mike

  135. MATH

    which two points of a trignometric function will always give an average rate of change of 0?

    asked by shab

  136. solid geometry...

    find the area of the earth's surface within the Arctic Circle; that is, in latitude north 66° 32' N. thank you! :D

    asked by sara

  137. factoring math

    factor -16sin^2a+81

    asked by sasha

  138. math(geometry)

    find the altitude on hypotenuse if a=6cm and b=8cm?

    asked by Hoema

  140. math

    Hello, I'm having a hard time fingering our this question. Not really sure what formula to use. Thanks in advance! For a five year period, Ned deposited $800 each quarter into an account paying 5.6% annual interest compounded quarterly. (a) How much money

    asked by lynn

  141. algebra

    simply. Assume m,n=0 (5m^-4n^2)^3

    asked by plz help

  142. math

    3x+8 over 5 + 7/5= -7x over 4

    asked by amanda

  143. MATH

    Solve by finding y and graph using the slope and y-intercept: 3x-y=1 x-y=3 3x-8=y Use the point-slope form of an equation to write the following in slope intercept form: m= 3 point: (4,2) m= 3/8 point: (3,5)

    asked by Please Please Help

  145. Health

    Could you please check if these questions are all possible? Thank you, Writeacher. 1)Focus on the first Hanoverians and answer briefly the following questions. What were the first political parties in Britain, where did they descend from and who sided with

    asked by Mike

  146. french

    i need a sentence for controle

    asked by jessie

  147. poems

    does anyone know a poem about seashores and it has to be aroung grade 6 level thank u?

    asked by smiley

  148. algebra

    evaluate -a^4when a= -2 -a^4=

    asked by plz help

  150. algebra

    express using a positive exponent 1/k^-w 1/k^-w=

    asked by plz help

  151. algebra

    multiply and simpify y^-4*y^6*y^7=

    asked by plz help

  152. algebra

    divide and simplifyr r^-7/r^-3= divide and write expression using positivr exponent.

    asked by plz help

  153. algebra

    solve -9< 4x - 4< -3

    asked by Sue

  155. math

    calculate 10^1.27 how do i do this?

    asked by hannah

  156. RR

    simply (r^-6)^-5 (r^-6)^-5=

    asked by plz help

  157. math

    a/5-1/5=-6

    asked by amanda
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