Popular questions and responses by Jake
  1. Chemistry

    Determine how many mL of solution A (acetic acid-indicator solution) must be added to solution B (sodium acetate-indicator solution) to obtain a buffer solution that is equimolar in acetate and acetic acid. Solution A: 10.0 mL 3.0e-4M bromescol green

    asked on October 29, 2012

    What type of distribution is described by the following information? Mean = 56 Median = 58.1 Mode = 63

    asked on June 2, 2010
  3. Calculus

    A man of height 1.7 meters walks away from a 5-meter lamppost at a speed of 1.6 m/s. Find the rate at which his shadow is increasing in length. (Round your answer to three decimal places.) This problem is absolutely killing me I see a lot of examples like

    asked on October 7, 2015
  4. english

    1. Write a composition using one of the topics listed below. Your composition should be three to five paragraphs long. It should contain an introduction, a body, and a conclusion. c. Compare and contrast driving in the winter and driving in the summer. 2.

    asked on January 10, 2012

    A Statistics teacher has the following test scores : 93, 72, 80, 95, 90, 70, 91, 85, 86, 100 What is the median test score of these grades ?

    asked on June 3, 2010

    There are 10 colored balls in a box ( 5 red, 3 blue, 2 green ). What is the probability of picking out a red ball and then a blue ball ( If I do not replace the red ball

    asked on June 2, 2010
  7. math

    The diagonal of a TV set is 26 inches long. Its length is 14 inches more than the height. Find the dimensions of the TV set.

    asked on February 21, 2016

    The Sarasota Police department collected data on the number of car accidents ( X ) that occur each day on a certain stretch of route 41. From this data, they derived the probability distribution shown in the table below. X P(X) 0 0.80 1 0.15 2 0.05 What is

    asked on June 2, 2010
  9. Algebra

    Find all values of t such that [t] =2t+3. If you find more than one value, then list the values you find in increasing order, separated by commas. The brackets represent the floor sign function.

    asked on December 13, 2014
  10. physics

    5) After catching the ball, Sarah throws it back to Julie. The ball leaves Sarah's hand a distance 1.5 meters above the ground, and is moving with a speed of 22.0 m/s when it reaches a maximum height of 9.0 m above the ground. What is the speed of the ball

    asked on September 10, 2012
  11. Chemistry

    Which pair of ions will be most likely to react at standard state conditions? 1. a) MnO4- and Sn2+ 2. b) Zn2+ and Cl- 3. c) I- and Cu 4. d) Fe3+ and Cu2+

    asked on May 15, 2012
  12. Chemistry

    If a piece of copper metal is dipped into a solution containing Cr3+ ions, what will happen? Explain with Ev values

    asked on May 15, 2012
  13. Chem

    when 21.70 ml of 0.5000 m h2so4 is added to 21.70 mL of 1.000 M KOH in a coffee cup calorimeter at 23.50 degrees c, the temperature rises to 30.17 degree c. calculate delta H of this reaction (Assume that the total volume is the sum of the individual

    asked on October 7, 2014
  14. Chemistry

    consider the following reaction at 298K 4Al(s)+3O2(g) yields 2Al2O3(s) delta H= -3351.4 Kj find delta S sys find delta S surr find delta S unvi

    asked on January 29, 2015
  15. Chemistry

    If you wanted to create a equimolar buffer using 1.0 mol of NaHS in 1.0L of water what acid would you need to add? how many moles of that acid do you need to add?

    asked on February 11, 2017
  16. 8th grade math

    Jerome, Kevin, & Seth shared a submarine sandwich. Jerome ate 1/2 of the sandwich, Kevin ate 1/3 of the sandwich and Seth ate the rest. What is the ration of Jerome's share to Kevin's share to Seth's share? 1. 2:3:6 2. 2:6:3 3.3:1:2 4.3:2:1 5.6:3:2 please

    asked on December 7, 2012
  17. Chemistry

    Using the following spontaneous reactions, classify the 3 metals involved (Cr, Sn, Al) according to increasing reductant properties. a) 2Cr + 3Sn2+ 2Cr3+ + 3Sn b) Al + Cr3+ Al3+ + Cr

    asked on May 15, 2012
  18. Chemistry

    All of the following are postulates of the kinetic molecular theory of gases except A. The gas molecules are in constant motion. B. The gas molecules are in rapid motion. C. The collisions between molecules are elastic. D. At a constant temperature, each

    asked on December 9, 2010
  19. chem (science)

    Which of the following pairs of elements are likely to form ionic compounds: A) helium and oxygen B) magnesium and chlorine C) chlorine and bromine D) potassium and sulfur E) sodium and potassium F) nitrogen and oxygen I believe the answer is d and f Would

    asked on September 18, 2011
  20. Chemistry

    The following reaction has a Delta G value of 42.6 kJ/mol at 25oC: HB(aq) +H2O(l) --> H3O+(aq) +B-(aq) Calculate Ka for the acid HB.

    asked on May 7, 2012
  21. Chemistry

    Complete and balance the precipitation reactions. Include physical states in your equations. Ba(NO3)2(aq) + CuSO4 (aq)---> K3PO4(aq)+MgCl2 (aq)---->

    asked on November 9, 2013
  22. Statistics

    For a 10 point quiz, the professor recorded the following scores for 8 students: 7, 8, 3, 9, 10, 6, 8, 5 What is the Mean for this set of scores?

    asked on June 1, 2010
  23. chemistry

    The standard internal energy change for a reaction can be symbolized as ΔU°rxn or ΔE°rxn. For the following reaction equations, calculate the energy change of the reaction at 25 °C and 1.00 bar. Sn(s) + 2Cl2(g) --> SnCl4(l) ΔH°rxn = -511.3 kJ/mol

    asked on February 28, 2016
  24. chemistry

    A gas absorbs 45 kJ of heat and does 29 kJ of work. Calculate the change in energy. The answer is 16 kJ, but I don't understand why. If a gas absorbs heat and does 29 kJ of work. Wouldn't they both be positive? Change in energy = q + w 45 kJ + 29 kJ = 74

    asked on March 31, 2010
  25. Precalculus

    Write 4log2+log6-log3 as a single logarithm. Explain with steps please!~~

    asked on January 30, 2012
  26. Chemistry

    CaO(s) + 3C(s) > CaC2(s) + CO(g) deltaHrxn = +464.8 kJ/mol-rxn Is the reaction endothermic or exothermic? What is the enthalpy change if 10.0 g of CaO is allowed to react with an excess of carbon?

    asked on December 8, 2010
  27. Physics Need Help PLEASE

    Two point charges are separated by 8 cm. The attractive force between them is 14 N. If the two charges attracting each other have equal magnitude, what is the magnitude of each charge?

    asked on April 9, 2012
  28. english

    1. Write a composition using one of the topics listed below. Your composition should be three to five paragraphs long. It should contain an introduction, a body, and a conclusion. c. Compare and contrast driving in the winter and driving in the summer. 2.

    asked on January 10, 2012
  29. Calculus

    A hot-air balloon is 180 ft above the ground when a motorcycle passes directly beneath it (travelling in a straight line on a horizontal road) going at a constant speed of 60 ft/s. If the balloon is rising vertically at a rate of 15 ft/s, what is the rate

    asked on March 15, 2011
  30. Chemistry

    Which of the following compounds has the highest vapor pressure at 25°C? A. CH3CH2OH B. CH3OCH3 C. CH3CH2CH2Cl D. CH3CH2CH3 E. CH3CH2CH2CH

    asked on December 9, 2010
  31. Physics

    A lead ball, with an initial temperature of 25.0oC, is released from a height of 125.0 m. It does not bounce when it hits a hard surface. Assume all the energy of the fall goes into heating the lead. Find the temperature (in degrees C) of the ball after it

    asked on February 7, 2019
  32. chemistry

    From the following information, determine ΔH°f of malonic acid, CH2(COOH)2(s). CH2(COOH)2(s) + 2O2(g) → 3CO2(g) + 2H2O(l); ΔH° = –861.0 kJ Substance ΔH°f (kJ/mol) CO2(g) –393.5 H2O(l) –285.8 A. 2613.1 kJ B. –1540.3 kJ C. –2613.1 kJ D.

    asked on December 2, 2010
  33. chemistry

    write the balanced molecular and net iconic equations for the reaction between aluminium metal and silver nitrate. Identify the oxidation and reduction half-reaction

    asked on October 19, 2014
  34. Math Check 2 ?s quick

    The angle of elevation to the top of a 20-story skyscraper is measured to be 10 from a point on the ground 1,500 feet from the building. Find the height of the skyscraper in feet, correct to three decimal places. (Points : 5) 260.47 73.86 972.54 264.49

    asked on January 14, 2014
  35. Chemistry

    Calculate the molar concentration of acetic acid (CH3COOH) in a 5.00-mL sample of vinegar (density is 1.00 g/mL) if it is titrated with 25.00 mL of NaOH.

    asked on March 4, 2009
  36. Spanish

    Conjugate the following irregular verbs in the simple present tense (Indicative). 6. tener (to have) yo ________________________ 7. tener (to have) nosotros ________________________ 8. venir (to come) tú ________________________ 9. venir (to come)

    asked on February 6, 2016
  37. math

    A candle is 17 in. tall after burning for 3 hours. After 5 hours, it is 15 in. tall. Write a linear equation to model the relationship between height h of the candle and time t. Predict how tall the candle will be after burning 8 hours.

    asked on October 9, 2012
  38. chemistry

    What is the net ionic equation for the reaction of formic acid, HCOOH, with NH3? A. H+(aq) + NH3(aq) → NH4+(aq) B. H+(aq) + OH–(aq) → H2O(l) C. HCOOH(aq) + NH3(aq) → NH4+(aq) + HCOO–(aq) D. HCOO–(aq) + H+(aq) + NH3(aq) → NH4HCOO(aq) E.

    asked on November 10, 2010
  39. writing skills

    7. The best way to ensure parallel construction in your essay is to use similar A. paragraph lengths. [B. sentence structure throughout.] C. topic headings in your outline. D. details in each paragraph.

    asked on August 23, 2012
  40. chemistry

    Which two orbitals from CV+ and –OH will overlap creating the C-O bond in CVOH? Which of the following accurately shows the orbital interaction that leads to bond formation between CV+ and –OH?

    asked on November 7, 2010
  41. Algebra

    Let a1,a2,a3..... be an increasing arithmetic sequence of integers. If a4a5=13 what is a3a6?

    asked on December 13, 2014
  42. Calculus

    Suppose f(x) is a continuous function. Then a function F(x) such that F'(x) = f(x) is called: A.) the indefinite integral of f B.) the antiderivative of f C.) an antiderivative of f D.) a definite integral of f E.) All of the above

    asked on February 28, 2020
  43. Physics Help!!

    A passenger on an interplanetary express bus traveling at v = 0.94c takes a seven-minute catnap by his watch. How long does the nap last from your vantage point on a fixed planet?

    asked on May 5, 2012
  44. Calculus

    Determine an expression, in simplified form, for the slope of the secant PQ. Given: P(1,3) , Q(1+h, f(1+h)) , where f(x) = 3x^2 PQ=Y2-Y1/X2-X1 I keep getting wrong answer, arghhh.

    asked on February 8, 2012
  45. Precalculus

    Solve for x: 6^(x+3) - 6^x = 215. I got answer as 1, is it correct?

    asked on January 29, 2012
  46. Math

    How do I solve this if there is no equation to this 1. The population of the bacteria in a Petri dish increases by a factor of 10 every 10 hour. If there are initally 20 bacteria in the dish, how long will it take before the population increases to 60,000

    asked on January 28, 2012
  47. chemistry

    The strongest intermolecular forces present in a sample of pure I2 are A. covalent bonds. B. covalent network bonds. C. metallic bonds. D. dipole–dipole forces. E. London forces.

    asked on December 9, 2010
  48. math

    Complete the table for a savings account in which interest is compounded continuously. initial investment = $600 annual % rate = ? time to double ? Amount after 10 years = $19,205.00 I have no idea how to solve this.

    asked on September 14, 2009
  49. Physics

    Four resistors 2.1Ω, 3.2 Ω, 4.3 Ω, and 5.4 Ω are connected in a series to a 9 V battery. The effective resistance in the circuit is:

    asked on May 28, 2013
  50. Math

    If an object travels in a circle 32pi/5 radians, at what degree measure is it, relative to where it started? a) 1052° b) 144° c) 72° d) 98.6° I got 1152° but there is no option for the answer, what did I wrong?

    asked on January 18, 2012
  51. What is discrete math? And is it relatively easy?

    I ask because my TA recommended taking it next semester along with calc 3. My major is electrical engineering, and I might throw actuarial science into the mix too. So yeah, lots of math.

    asked on December 18, 2007
  52. Algebra

    Which represents the reference angle for 3pi/4? A) (3 pi)/4 B) pi/3 C) pi/4 D) pi/6 I have no clue on how to do this. (Looking at my unit circle I think A?)

    asked on May 29, 2014
  53. writing skills

    12. Which sentence contains a prepositional phrase? A. They tried, although they didn't expect to win. [B. Running all the way, he got there early.] C. With the proper help, they'll complete the project early. D. They sang it, and sang it again.

    asked on July 2, 2012
  54. Biology

    Among humans, increased interest in food intake normally occurs _____. only after the production of glucose in the liver can no longer meet metabolic needs when fewer calories are taken in than are expended, but only after the body depletes its reserves of

    asked on March 14, 2012
  55. Math

    1. The height of a bumble bee above the ground is modelled by h(t) = 0.5cos(2π t) + 2, where h is in metres and t is in seconds. At what time is the bee’s instantaneous rate of change of height with respect to time greatest? a.) 1 s b.) 1.25s c.) 1.5s

    asked on January 18, 2012
  56. history

    4. Which sentence contains a verb in the simple past tense? A. She obeys her father. B. She has obeyed her father. C. She had obeyed her father. [D. She obeyed her father.] is my answer correct

    asked on December 14, 2011
  57. college chemistry

    Consider the following metals. Metal Specific Heat copper 0.385 J/(g · °C) magnesium 1.02 J/(g · °C) mercury 0.138 J/(g · °C) silver 0.237 J/(g · °C) lead 0.129 J/(g · °C) If the same amount of heat is added to 25.0 g of each of the metals, which

    asked on December 2, 2010
  58. physics

    explain the relationship between contours of constant potential and the electric field direction. why is the electric field a vector quantity while the electric potential is a scalar?

    asked on February 1, 2010
  59. Math

    What is the volume of a box that will hold exactly 567 cubes with 1/3 inch sides? I am somewhat confused on how to solve this. Please help.

    asked on February 22, 2019
  60. reading

    What is a summary for chapter 2 slam by Walter dean Myers

    asked on March 7, 2017
  61. Spanish

    . Choose the correct form of the verb comer (to eat) that agrees with the subject ellos. A. como B. comes C. come D. comen choose D. but I'm not sure

    asked on January 21, 2016
  62. Physics

    Mary needs to row her boat across a 100m wide river that is flowing to the east at a speed of 1.0m/s. Mary can row with a speed of .0m/s a) If mary points her boat due north, how dar from her intended landing spot will she be when she reaches the opposite

    asked on September 14, 2012
  63. Chemistry

    Can a solution of CrCl3 be stored in an aluminum container?

    asked on May 15, 2012
  64. Calculus

    Could someone help me setup an equation for this equation? --------------------------------- A city bus system carries 4000 passengers a day throughout a large city. The cost to ride the bus is $1.50/person. The owner realizes that 100 fewer people would

    asked on March 7, 2012
  65. algebra

    For all positive integers x, let x▲ be defined to be (x-1)(x+1). Which of the following is equal to 6▲ - 5▲ ? Does this mean I'm supposed to multiply the 6 and the 5 to (x^2-1) and subtract them from each other?

    asked on September 13, 2011
  66. Chemistry

    A 0.250-g sample of a magnesium-aluminum alloy dissolves completely in an excess of HCl (aq) . When the liberated H2 (g) is collected over water at 29 degrees celsius and 752 torr, the volume is found to be 301 mL . The vapor pressure of water at 29

    asked on February 28, 2011

    The area under a normal curve distribution is Equal to 100 almost equal to 1 equal to 1 equal to .5

    asked on June 3, 2010
  68. Gen. Chemistry

    A 0.887 g sample of a mixture of NaCl and KCl is dissolved in water and the solution is treated with an excess of AgNO3 producing 1.822 g of AgCl. What is the percent by mass of each component in the mixture?

    asked on March 2, 2009
  69. math

    A bakery sells 5800 muffins in 2010. The bakery sells 7420 muffins in 2015. Write a linear model that represents the number y y of muffins that the bakery sells x x years after 2010

    asked on December 21, 2016
  70. physics

    A public transportation bus travels back and forth along a road, following the position-time graph over the time period shown below. There are five points labeled on the graph. What is the average speed and velocity (magnitude and direction) of the bus

    asked on September 18, 2016
  71. Geometry

    What is the area of a regular pentagon with an apothem 14 inches long and a side 20 inches long? Round the answer to the nearest inch. Answer choices: 1400 in.^2 700 in.^2 175 in.^2 140 in.^2 Give work, not answer, please.

    asked on May 14, 2016
  72. math

    The population of the world was 7.1 billion in 2013, and the observed relative growth rate was 1.1% per year. (a) Estimate how long it takes the population to double. (Round your answer to two decimal places.) _______yr (b) Estimate how long it takes the

    asked on April 18, 2016
  73. Physics

    A brick of mass 2.3 kg is lifted to a height of 1.9 m. How much gravitational potential energy is added to the brick? Acceleration due to gravity is g = 9.8 m/s2.

    asked on November 16, 2014
  74. science

    The acceleration of gravity on the surface of Venus is 8.9m/s^2. Would a ball thrown upward on Venus return to the ground sooner or later than a ball thrown upward with the same speed on the earth?

    asked on February 22, 2013
  75. writing skills

    20. A disadvantage of using a sentence outline instead of a topic outline is that a sentence outline is often A. rigid. B. factually grounded. C. underdeveloped. [D. time-consuming.]

    asked on August 23, 2012
  76. Physics 161

    A cat dozes on a stationary merry-go-round, at a radius of 6.9 m from the center of the ride. The operator turns on the ride and brings it up to its proper turning rate of one complete rotation every 7.3 s. What is the least coefficient of static friction

    asked on February 28, 2012
  77. Math

    Could someone explain the steps for this question. Simplify the expression tan(5pi/8)-tan(3pi/8)/1+tan(5pi/8)tan(3pi/8)

    asked on January 24, 2012
  78. Math

    If the diameter of a monster truck tire is 3.5 m and it makes one rotation every 5 seconds, how far does the tire roll in 1 minute? Diameter 3.5 radius: 3.5/2 = 1.75 12(2pi x 1.75) =131.9 m the book states that its 263.89 m? What did I do wrong?

    asked on January 19, 2012
  79. english

    17. Which of the following is a complex sentence that contains a dependent adverbial clause? A. Mark expects the photo to arrive late. B. Mark expects the photo to arrive in damaged condition. [C. Mark expects the photo to arrive when the letter arrives.]

    asked on January 4, 2012
  80. english

    11. The following sentence contains which type of conjunction? He is not only a great player but also an exceptional coach. A. Correlative [B. Coordinating] C. Phrasal D. Subordinating is my answer correct

    asked on December 14, 2011
  81. Economics

    As the aggregate price level falls, the number of domestic products purchased by foreigners will [rise], causing the quantity of domestic output demanded to [rise]. This is known as the [foreign purchases effect]. The first two blanks can be rise,fall or

    asked on March 6, 2011
  82. college chemistry

    To dilute a solution from 0.600 M to 0.100 M, the final volume must be A. 1/6 the original volume. B. 0.7 L. C. More information is needed to answer this question. D. 6 times the original volume. E. 60 L.

    asked on November 18, 2010
  83. Chemistry

    I'm going over some post-laboratory questions for Conductivity of Solutions. One of the questions is... From your measurements, what can you say about a) the presence of ionic impurities in tap water? b) the presence of molecular impurities in tap water? I

    asked on February 18, 2009
  84. chemistry

    Precipitation Reactions Write a molecular equation for the precipitation reaction that occurs (if any) when the following solutions are mixed. If no reaction occurs, write NO REACTION. Express your answer as a chemical equation. Identify all of the phases

    asked on February 9, 2009
  85. English

    Hi i am writing a response paper for "Cathedral" by Raymond Carver. Im not sure but is this a proper thesis statement. In the short story Cathedral, by Raymond Carver, a man refers to Robert as "this blind man." Not only is he categorizing Robert, but he's

    asked on January 26, 2009
  86. Physics

    If a cannonball and a BB have the same speed, which has the longer wavelength?

    asked on April 2, 2008
  87. Accounting

    On September 1, 2011, Fast Track, Inc. was started with $30,000 invested by the owners as contributed capital. On September 30, 2011, the accounting records contained the following amounts: Accounts Payable $2,200 Dividends Declared and paid $2,300

    asked on September 26, 2016
  88. math

    Check plz There are shirts on sale for 25% off. The sale price is 12.75. What is the original price. $12.75 *.25=3.19 $12.75+3.19=15.94

    asked on March 2, 2015
  89. Algebra

    The fifth term of an arithmetic sequence is 11. If the difference between two consecutive terms is 1, what is the product of the first two terms?

    asked on December 13, 2014
  90. writing skills

    11. Which of the following is correct in regard to the use of formal English? A. In formal business correspondence, it's best keep the language impersonal. [B. Formal English is used more frequently in speaking than in writing.] C. In formal English, we

    asked on July 2, 2012
  91. math

    7. A _______ is a group of people who agree to save their money together and to make loans to each other at a relatively low rate of interest. [A. commercial bank] B. credit union C. Christmas club D. investment firm

    asked on January 11, 2012
  92. math

    3. The gross income of David Vaughn is $785 per week. His deductions are $42.25, FICA tax; $90.33, income tax; 2% state tax; 1% city tax; and 3% retirement fund. What is her net income for one week? A. $675.32 B. $628.77 [C. $605.32] D. $749.77

    asked on January 10, 2012
  93. history

    The 1978 Supreme Court decision in Bakke v. Regents of the University of California A. established the "red state-blue state" divide. [B. ruled against the principle of affirmative action.] C. established the rights of students to appeal college admissions

    asked on December 12, 2011
  94. math

    Suppose the mean of dogs a pet shop grooms each day is known to be 14.2 dogs. If a sample of n=12 days is chosen and a total of 178 dogs are groomed during those 12 days, then the sampling error is?

    asked on December 10, 2011
  95. Chemistry

    What is the Cl concentration just as Ag2CrO4 begins to precipitate when 1.0 M AgNO3 is slowly added to a solution containing 0.015 M Cl and 0.015 M CrO4^2?

    asked on February 20, 2011
  96. math

    A man is 6ft tall is standing 10 feet from the base of a lamp post. The mans shadow has a lenght of 4ft . How tal is he lamp post

    asked on January 31, 2011
  97. chemistry

    I got E) for the first and couldn't figure out the other one. Can any one verify the first and help with the second?? In which of the following processes is there a decrease in the potential energy of the substances involved? A) a coil spring is compressed

    asked on January 13, 2011
  98. chemistry

    I got E) for the first and couldn't figure out the other one. Can any one verify the first and help with the second?? In which of the following processes is there a decrease in the potential energy of the substances involved? A) a coil spring is compressed

    asked on January 13, 2011
  99. college algebra

    f(x)=x^2+3; g(x)=x+4 find (fog)(-2) I have an answer of -7 or could this be just 7

    asked on April 23, 2010
  100. Chemistry

    list in order from most ionic to most covalent kbr, Hcl, NaF, N2,

    asked on January 21, 2010


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