Most popular questions and responses by Jordan
  1. chemistry

    Quantum numbers arise naturally from the mathematics used to describe the possible states of an electron in an atom. The four quantum numbers, the principal quantum number (n), the angular momentum quantum number (ℓ), the magnetic quantum number (mℓ),

    asked on November 4, 2016
  2. Chemistry

    At 25 °C, an aqueous solution has an equilibrium concentration of 0.00147 M for a generic cation, A (aq), and 0.000735 M for a generic anion, B2–(aq). What is the equilibrium constant, Ksp, of the generic salt A2B(s)?

    asked on May 6, 2016
  3. Chem 2

    4) Calculate the solubility of calcium hydroxide, Ca(OH)2 (Ksp = 5.5 x 10-5) in grams per liter in: a. Pure water b. 0.10 M CaCl2

    asked on July 29, 2014
  4. CHM

    Calculate the percent ionization of hydrazoic acid (HN3) in solutions of each of the following concentrations A) 0.377 M B) 0.107 M C) 4.16*10^-2 M Ka= 1.9*10^-5

    asked on October 8, 2012
  5. History

    Which examines the relationship between the colonies and their imperial governments? The interdependent relationship between imperial powers and colonies was created through infrastructure and construction projects. Imperial powers used various forms of

    asked on January 3, 2018
  6. chemistry

    Which neutral atoms have the following electron configurations in either a ground state or excited state? Enter the name or symbol. [Ar]4s23d3 - I know that this is Vanadium [Xe]6s24f1 - I thought that this was Lu but it counts it wrong each time! Help

    asked on November 4, 2016
  7. Algebra

    a. Do some research and find a city that has experienced population growth. Determine its population on January 1st of a certain year. Write an exponential function to represent the city’s population, y, based on the number of years that pass, x after a

    asked on February 27, 2018
  8. Physics

    A copper pipe with an outer radius of 0.011 m runs from an outdoor wall faucet into the interior of a house. The temperature of the faucet is 4.4° C and the temperature of the pipe, at 3.1 m from the faucet, is 24° C. In fourteen minutes, the pipe

    asked on April 26, 2012
  9. Math

    Find the unknown digit to make the sentence true 2.48>2.4__ 1>2.463 5.723

    asked on September 10, 2012
  10. physics

    While standing at the edge of the roof of a building, you throw a stone upward with an initial speed of 7.65 m/s. The stone subsequently falls to the ground, which is 11.1 m below the point where the stone leaves your hand. At what speed does the stone

    asked on September 7, 2015
  11. Math

    If the population of a town grew 11% up to 5,173, what was the population last year.

    asked on June 23, 2016
  12. World History

    Which options accurately describe life events of explorer Jacques Cartier? (select all that apply) A) Cartier established a colony near Roanoke Island in present-day North Carolina. B) Cartier named Canada after the Huron-Iroquois word for settlement,

    asked on December 16, 2018
  13. Math

    Kelly subtracted 2.3 from 20 and got 17.7. Explain why this is reasonable.

    asked on October 19, 2008
  14. Chemistry

    What is the minimum amount of 6.0M H2SO4 necessary to produce 19.0g of H2(g) according to the reaction? 2Al(s)+3H2SO4(aq)→Al2(SO4)3(aq)+3H2(g)

    asked on November 14, 2014
  15. Physics

    A shot-putter throws the shot (mass = 7.3kg) with an initial speed of 15.0 m/s at a 33.0 degree angle to the horizontal. Calculate the horizontal distance traveled by the shot if it leaves the athlete's hand at a height of 2.00m above the ground.

    asked on September 12, 2009
  16. physics

    In lacrosse, a ball is thrown from a net on the end of stick by rotating the stick and forearm about the elbow. If the angular velocity of the ball about the elbow joint is 30.3 rad / s and the ball is 1.35 m from the elbow joint, what is the velocity of

    asked on October 5, 2015
  17. Math

    Jennifer got a box of chocolates. The box is a right triangular prism shaped box. It is 7 inches long, and the triangular base measures 2 inches x 3 inches x 4 inches. What is the surface area of the box of chocolates?

    asked on February 27, 2018
  18. physics

    The drawing shows a version of the loop-the-loop trick for a small car. If the car is given an initial speed of 4.5 m/s, what is the largest value that the radius r can have if the car is to remain in contact with the circular track at all times?

    asked on October 8, 2010
  19. Math

    What are the coefficients in the polynomial 4x^2+3x-3? I'm not posting this to get the exact answer, I just need help on finding the coefficients. I'm not real good with polynomials, and I've been struggling a little. I just need explaining on how to find

    asked on May 9, 2018
  20. Physics

    A bat strikes a 0.145-kg baseball. Just before impact, the ball is traveling horizontally to the right at 47.0 m/s ; when it leaves the bat, the ball is traveling to the left at an angle of 31.0 ∘ above horizontal with a speed of 58.0 m/s . The ball and

    asked on June 26, 2016
  21. Social studies PLEASE HELP!

    1. What was one impact of the Iranian Revolution on the United States? a. Higher oil prices*** b. Increased terrorisim c. Increased taxes d. Increased military spending

    asked on May 18, 2017
  22. Chemistry

    A compound is found to contain 50.05 % sulfur and 49.95 % oxygen by mass. What is the simplest (empirical) formula for this compound? They said to assume that it is 100 grams. I found the molar mass. S- 32.06 0-16.00 But now I don't know what to do. Please

    asked on August 27, 2015
  23. Physics

    A football is kicked at 45 degrees and travels 82 meters before hitting the ground. A) What was its initial velocity? B) How long was it in the air? C) How high did it go?

    asked on December 9, 2009
  24. Algebra

    The Circumference and area of a circle of radius r are givin by 2 [pie] r and [pie] r[2], respectively use 3.14 for the constant [pie] A. What is the circumference of a circle with a radius of 2 m? B.What is the area of a circle with a radius of 2 m? C.

    asked on September 17, 2007
  25. Social Studies Please help

    I need the answers to Unit 4 lesson 8 Constituition for the United states. It is a pretest not a test and it is for connections academey.

    asked on December 16, 2016
  26. Physics

    A pendulum 1.70m long is released (from rest) at an angle 30 degrees. 1. Determine the speed(m/s) of the 60.0g bob at Theta = 15. 2. Determine the tension in the cord at the lowest point Theta = 0. 3. Determine the tension in the cord at Theta = 15. A

    asked on October 17, 2012
  27. Physics

    The treasure map in the figure gives the following directions to the buried treasure: "Start at the old oak tree, walk due north for 490 paces, then due east for 120 paces. Dig." But when you arrive, you find an angry dragon just north of the tree. To

    asked on January 29, 2012
  28. chemistry

    The number of unpaired electrons and the element for [Xe]6s24f145d7: I know the element is Iridium but I cannot figure out the unpaired electrons!

    asked on November 25, 2016
  29. science

    what variable can affect the attendance at a football game?

    asked on May 9, 2011
  30. Math

    Chad buys peanuts in 2 pound bags he repackages them into bags that hold 5/6 pounds of peanuts how many 2 pound bags of peanuts Should Chad by so that he can fill the 5/6 pound bags without having any peanuts leftover

    asked on February 3, 2014
  31. physics

    A long thin rod is cut into two pieces, one being as long as the other. To the midpoint of piece A, piece B is attached perpendicularly, in order to form the inverted "T" shown in the figure. The application of a net external torque causes this object to

    asked on October 27, 2012
  32. English Help!

    What is one of Carmody's main motives in this scene?

    asked on May 15, 2017
  33. pre-calculus

    A developer wants to build homes on a rectangular plot of land 4 kilometers long and 3 kilometers wide. In this part of the city, regulations require a greenbelt of uniform width along two adjacent sides. The greenbelt must be 10 times the area of the

    asked on October 14, 2011
  34. math

    A student takes a multiple choice quiz with 12 questions and 5 alternatives per question. Unfortunately, this student has no idea what any of the answers are, so he randomly selects an alternative for each question on the exam. Using this “blind

    asked on September 24, 2015
  35. Chemistry.

    Calculate the mass of CaCO3 that would produce 40 mL at STP. STP means P= 1 atm and T= 0 degrees C. How do I find the mass?

    asked on November 22, 2008
  36. physics

    An unsuspecting bird is coasting along in an easterly direction at 4.00 mph when a strong wind from the south imparts a constant acceleration of 0.300 m/s2. If the acceleration from the wind lasts for 2.70 s, find the magnitude, r, and direction, θ, of

    asked on September 8, 2015
  37. physics

    You throw a baseball directly upward at time t = 0 at an initial speed of 13.3 m/s. What is the maximum height the ball reaches above where it leaves your hand? At what times does the ball pass through half the maximum height? Ignore air resistance and

    asked on September 7, 2015
  38. Physics

    A baseball is popped straight up into the air and has a hang-time of 6.25 s. Determine the height to which the ball rises before it reaches its peak.

    asked on November 1, 2010
  39. math

    Two sides of a triangle measure 25 cm and 35 cm.Which could be the third side.

    asked on June 12, 2017
  40. Science

    Which of the following can be accurately said about climax communities? A. Climax communities are always stable. (B. Restoration of the original climax community is always achieved at the same rate.) C. Climax communities are always uniform. D. Restoration

    asked on March 23, 2016
  41. chemistry

    Suppose you live in a different universe where different amount of quantum numbers is required to describe the atomic orbitals. These quantum numbers have the following rules: N principal 1,2,3,…. L orbital =N M magnetic -1. 0. +1 How many orbitals are

    asked on November 12, 2008
  42. math

    Juan and rachel have the same number of marbles. Rachel gives away 10 marbles and Juan gives away 22 marbles. Rachel then has 3 times as many marbles as Juan. How many marbles did each of them have at first

    asked on November 19, 2014
  43. physics

    A car starts from rest on a curve with a radius of 120m and accelerates at 1.0m/s^2. Through what angle will the car have traveled when the magnitude of its total acceleration is 2.0 m/s^2?

    asked on September 22, 2009
  44. math

    each box has 10 pencils . how many pencils do 3 boxes have ?

    asked on January 21, 2011
  45. differential calculus

    a man 6 ft tall is walking toward a building at the rate of 4 ft/sec. if there is a light on the ground 40 ft from the building, how fast is the man's shadow on the building growing shorter when he is 30 ft from the building?

    asked on October 14, 2015

    A physics exam consists of 9 multiple choice questions and 6 open-ended problems in which all work must be shown.If an examinee must answer 6 of the multiple- choice questions and 3 of the open-ended problems, in how many ways can the questions and

    asked on April 30, 2015
  47. Science

    What is continental drift?

    asked on February 8, 2018
  48. Algebra 2/statistics

    On a fair 6-sided die, each number has an equal probability p of being rolled. when a fair die is rolled n times, the most likely outcome (the mean) is that each number will be rolled NP times, with a standard deviation of sqrt NP(1-P). Brandon rolls a die

    asked on April 30, 2015
  49. Physics

    Two boxes, A and B, are connected to each end of a light vertical rope. A constant upward force 90.0N is applied to box A. Starting from rest, box B descends 11.0m in 3.50s . The tension in the rope connecting the two boxes is 30.0N a) What is the mass of

    asked on February 17, 2015
  50. World History

    How did Asoka foster peace during his reign? Select all that apply. -He posted his laws in public on stone pillars. -He made everyone observe Buddhist practices. -He fought wars of conquest throughout his rule. He built rest houses and set up hospitals.

    asked on November 28, 2018
  51. Math-trig

    So how do find the arcsec(-3)? secy = x secx = -3 1/cosx = -3 1 = -3cosx -1/3 = cosx Now what angle is this?

    asked on June 20, 2018
  52. cal 1

    Find the dimensions of the rectangle of largest area that has its base on the x-axis and its other two vertices above the x-axis and lying on the parabola. (Round your answers to the nearest hundredth.) y = 7 - x^2

    asked on December 8, 2010
  53. Social Studies

    Which of the following were the cost of mining? Choose all that apply. A. Streams that were polluted and forests cut down B. permanent settlements began C. foreign miners were treated unfairly D. lawlessness and disorder were rampant I kinda don't really

    asked on May 4, 2018
  54. geometry

    Ray BD bisects ∠ABC so that m∠DBC = (x + 6)° and m∠ABD = (2x – 12)°. What is x?

    asked on September 27, 2017
  55. Physics

    Which of the following is correct for the reflected ray if a light ray strikes a plane mirror at an angle of 50° from the normal? a. 40° from the surface of the mirror b. 40° from the normal c. 50° from the surface of the mirror d. 90° from the normal

    asked on July 12, 2013
  56. chemistry

    A sample of 45.1 g of methane gas (CH4(g)) has a volume of 6.20 L at a pressure of 2.90 atm. Calculate the temperature. Another one that I'm stumped on, last question for my practice exam, can you explain how to solve?

    asked on November 4, 2016
  57. physics

    An electric drill starts from rest and rotates with a constant angular acceleration. After the drill has rotated through a certain angle, the magnitude of the centripetal acceleration of a point on the drill is twice the magnitude of the tangential

    asked on October 24, 2010
  58. Geometry

    A mountain bike tire has a diameter of 26 inches. To the nearest foot, how far does the tire travel when it makes 32 revolutions?

    asked on May 16, 2017

    As a solid, Ag adopts a face-centered cubic unit cell. How many unit cells are present per cubic centimeter of Ag?

    asked on September 27, 2012
  60. Chemistry

    The following information is given for ethanol, C2H5OH, at 1atm: boiling point = 78.4oC Hvap(78.4oC) = 38.6 kJ/mol melting point = -115oC Hfus(-115oC) = 5.02 kJ/mol specific heat liquid = 2.46 J/goC At a pressure of 1 atm, what is H in kJ for the process

    asked on January 24, 2011
  61. physic

    please help me im stuck. A 400 g air-track glider attached to a spring with spring constant 9.00 N/m is sitting at rest on a frictionless air track. A 600 g glider is pushed toward it from the far end of the track at a speed of 94.0 cm/s. It collides with

    asked on December 5, 2009
  62. Calculus (Help please)

    A tank has the shape of an inverted circular cone with a base radius of 5 meters and a height of 20 meters. If water is being pumped into the tank at 2 cubic meters per minute, find the rate at which the water level is rising when the water is 7 meters

    asked on January 9, 2012
  63. physics

    In the figure below, a constant horizontal force !@#$%^&p of magnitude 18 N is applied to a wheel of mass 12 kg and radius 0.50 m. The wheel rolls smoothly on the horizontal surface, and the acceleration of its center of mass has magnitude 0.50 m/s2. What

    asked on April 7, 2010
  64. Math

    As dry air moves upward it expands and in doing so cools at a rate of 1 degrees Celsius for each 100 m rise up to about 12 km If the ground temperature is 20 degrees Celsius find an expression for the temperature T as a function of the height H the answer

    asked on November 3, 2013
  65. geometry

    Point A is the incenter of (triangle) PQR. Find each measure. ARU AU QPK

    asked on November 8, 2011
  66. Math

    Janna is using a cone-shaped cup to fill a cylindrical container. The cup has the same height and radius as the container. How many times will she have to fill the cylindrical container? A. 1/3 B. 1 C. 2 D. 3 It didn't show the numbers for the radius or

    asked on May 31, 2018
  67. Spanish

    Can someone help me with this please Re-write the following dialogue adding the correct form of “estar” or the gerundio of the verb (other than estar) in parenthesis to form the present progressive form. Jose: Hola María. ¿Qué ___(5)___ (ESTAR tú)

    asked on May 25, 2009
  68. Physics

    The pressure and volume of an ideal monatomic gas change from A to B to C, as the drawing shows. The curved line between A and C is an isotherm. IMAGE:wvw.webassign.n3t/cj8/15-p-031.gif a)Determine the total heat for the process in joules. b)State whether

    asked on November 29, 2015
  69. Math (Calculus)

    A tank has the shape of an inverted circular cone with a base radius of 5 meters and a height of 20 meters. If water is being pumped into the tank at 2 cubic meters per minute, find the rate at which the water level is rising when the water is 7 meters

    asked on January 9, 2012
  70. phyical science.

    The type of fossil fuel that forms only from the remains of plants

    asked on January 16, 2008
  71. Math

    Write y = -2/3x -4 in standard form using integers. 2x + 3y = -12 2x + 3y = -4 -2x +3y = -12 2x + 3y = 12 I just need to know the steps for the most part, I don't get them.

    asked on December 14, 2018
  72. Math

    Reviewing for exams today... yay... Anyways, I need some help on this question. Name the subset(s) of the real numbers to which the number belongs: -7 There's no multiple choice answers by the way.

    asked on December 10, 2018
  73. Math1

    The population of Winnemucca, Nevada , can be modeled by P=6191(1.040^t where t is the number of years since 1990. What was the population in 1990? By what percent did the population increase by each year?

    asked on March 22, 2017
  74. Literature

    What are some differences between “The Finish of Patsy Barnes” by Paul Laurence Dunbar, and “Raymond’s Run” by Toni Cade Bambara, “The Story-Teller” by Saki, and “The Drummer Boy of Shiloh” by Ray Bradbury? I am writing an essay and I

    asked on October 13, 2016
  75. Science

    Scientists have discovered a new virus that is very different from any known viruses. What type of matter is the virus most likely made of? A)combination of protons and some atoms that have not been discovered so far. B)Combination of protons of differnt

    asked on November 3, 2017
  76. Geography

    Which hemisphere is responsible for most of the world's research and development? Northern Hemisphere or Southern Hemisphere. I've been reading over a site our teacher gave us, but I can't seem to find this.

    asked on November 1, 2018
  77. General Chemistry (College LvL)

    When a 4.00g sample of KBr is dissolved in water in a calorimeter that has a total heat capacity of 2.908 kJ x K^-1, the temperature decreases by .230 K. Calculate the molar heat of KBR

    asked on February 28, 2011
  78. 5th grade

    Can you explain what the "Silk Road" is?

    asked on September 15, 2008

    Calculate the heat energy released when 29.7 g of liquid mercury at 25.00 °C is converted to solid mercury at its melting point. Constants for mercury at 1 atm: Heat capacity of Hg (l) 28.0 J/Mol*K, Melting pt 234.32 k, and enthalpy of fusion 2.29 kg/mol

    asked on September 11, 2012
  80. SocialStudies

    #2 What was a common theme shared by Mayan and Aztec civilizations? A. They traded fur with the Dutch and French. B. They were both interested in astronomy. C. They shared similar marriage customs. D. They were nomadic and traveled in clans.*** #3 What was

    asked on September 4, 2018
  81. S.S.

    4.What can you infer about what Lewis and Clark saw as they moved west from the Mississippi River. -the land on the east coast was more fertile than the land in the west. -the landscape rose sharply and then flattened as they went farther west. -the

    asked on January 5, 2014
  82. Chemistry

    DrBob222, HELP! Calculate the heat energy released when 29.7 g of liquid mercury at 25.00 °C is converted to solid mercury at its melting point. Constants for mercury at 1 atm: Heat capacity of Hg (l) 28.0 J/Mol*K, Melting pt 234.32 k, and enthalpy of

    asked on September 11, 2012
  83. math

    the gas tank of a car is 2/3 full. a trip uses up 1/4 of the gas in the tank. how full is the tank at the end of the trip? please include how you got the answer, thanks

    asked on September 21, 2009
  84. language

    What is a tree map? Thank you for using the Jiskha Homework Help Forum. Here is a definition of "tree map" as concerning languages: Family Tree of Indo-European Languages:

    asked on January 12, 2007
  85. Algebra 1

    You buy a used car for $20,000. It depreciates at the rate of 21% per year. Find the value of the car for the given years (5 and 8) I'm using the equation v=c(1-r), and i end up getting 6154.11 ; im not sure if i subtract that from 20,000 or if that is my

    asked on July 28, 2016
  86. math

    Two teams, the Exponents and the Radicals, square off in a best of 5 math hockey tournament. Once a team wins 3 games, the tournament is over. The schedule of the tournament (for home games) goes: E-R-E-R-E If the Exponents are playing at home, there is a

    asked on January 25, 2016
  87. calculus

    If 3x^2 + y^2 = 7 then evaluate the second derivative of y with respect to x when x = 1 and y = 2. Round your answer to 2 decimal places.

    asked on March 10, 2015
  88. math

    As dry air moves upward it expands and in doing so cools at a rate of 1 degrees Celsius for each 100 m rise up to about 12 km If the ground temperature is 20 degrees Celsius find an expression for the temperature T as a function of the height H the answer

    asked on October 30, 2013
  89. Chemistry

    how many grams of aluminum sulfate are produced if 23.33 g Al reacts with 74.44 G CuSO4

    asked on May 21, 2012
  90. science

    An orange is placed on a table in a completely dark room, without any source of light. Which of the following choices correctly describes what an observer will see as he looks in the direction of the orange? A) The orange will not be seen at all because

    asked on April 23, 2019
  91. Chemistry

    What is the equilibrium constant in the following reaction [C][O2]/[CO2] [CO2]/[C][O2] [C]^2[O2]^2/[CO2]^2 [CO2]^2/[C]^2[O2]^2

    asked on May 4, 2016
  92. English 111

    33. I'll make a centerpiece out of it. 36. I thought it was a funny joke, but I didn't think you'd get sick. 37. We must persevere and not be implicated in wrong doing as we push ahead in this fight. 43. I don't believe in religion, but kept my eyes closed

    asked on December 9, 2013
  93. Chemistry

    Consider the reaction N2(g)+3H22NH3(g). What is the effect of decreasing the volume on the contained gases The reaction shifts toward the product gas The system reacts by increasing the number of gas molecules*** the pressure on the gases decreases

    asked on May 4, 2016
  94. Chemistry

    A 2.20 g-sample of a compound containing carbon, hydrogen, and oxygen is burned and it produces 4.61 g CO2 and 0.94 g H2O. What is the empirical formula of this compound?

    asked on September 7, 2015
  95. Chemistry

    If the CO2 is not removed by boiling after the addition of HCL, how will this affect the amount of NaoH required to reach the bromophenol endpoint. Explain.

    asked on April 9, 2014
  96. Chemistry

    An atom it ground state contains 18 electrons. How many of these electrons are in orbitals with l=0? a.4 b.2 c.8 d.6

    asked on April 4, 2011
  97. trig

    Suppose that θ is an angle in standard position whose terminal side intersects the unit circle at , −15/17,−8/17

    asked on June 4, 2017
  98. math

    Show 1/4 of a set of 8 counters. How many counters is that?

    asked on April 7, 2010
  99. History

    Two methods used to control annual floods were ______________

    asked on December 11, 2014
  100. Geometry Help!!!

    . Katrina lives directly east of the park. The football field is directly south of the park. The library sits on the line formed between Katrina’s home and the football field at the exact point where an altitude to the right triangle formed by her home,

    asked on May 22, 2014


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