Most popular questions and responses by Samuel
  1. General chemistry

    Phosphorus pentachloride is produced by the reaction between phosphine and chlorine gas. What mass of chlorine gas would be required to produce 0.015kg of phosphorus pentachloride?

    asked on March 31, 2019
  2. Probability

    The letters in the word MATHEMATICS are arranged randomly. What is the probability that the first letter is E? Preview What is the probability that the first letter is M?

    asked on March 25, 2016
  3. geometry

    A park maintenance person stands 16 m from a circular monument. Assume that her lines of sight form tangents to the monument and make an angle of 47°. What is the measure of the arc of the monument that her lines of sight intersect? Please don't just

    asked on May 3, 2012
  4. chemistry

    A 130.0 mL buffer solution is 0.100 M in NH3 amd 0.135 M in NH3 and 0.135 M in NH4Br. What mass of HCI could this buffer neutralize before the pH fell below 9.00?

    asked on November 6, 2011
  5. math

    Camp Oaks gets 32 boxes of orange juice and 56 boxes o apple juice.Each shelf in the cupboard can hold 8 boxes of juice. What is the least number o shelves needed for all the juice boxes?

    asked on January 21, 2015
  6. Calculus

    A voltage V across a resistance R generates a current I=VR. If a constant voltage of 4 volts is put across a resistance that is increasing at a rate of 0.3 ohms per second when the resistance is 4 ohms, at what rate is the current changing? (Give units.)

    asked on March 1, 2010
  7. math

    There are 6 muffins in a package.How many packages will be needed to feed 48 people if each person has 2 muffins? A.4 B.8 C.16 D.24

    asked on January 21, 2015
  8. algebra

    A rectangular piece of cardboard measures 17cm by 14cm. Strips of equal width are cut off one side and one end. The area of the remaining piece is 108cm^2. Find the width of the strips removed.

    asked on October 28, 2011
  9. General chemistry

    If 10g of phosphine is made to react with 15g of chlorine gas, calculate the percentage yield if 5.5g of phosphorus pentachloride was experimentally produced

    asked on March 31, 2019
  10. Arithmetic

    The sum of three consecutive terms of a geometric progression is 42, and their product is 512. Find the three terms.

    asked on November 25, 2017
  11. Algebra

    A rectangle is drawn so the width is 7 inches longer than the height. If the rectangle's diagonal measurement is 46 inches, find the height.

    asked on December 13, 2012
  12. chemistry

    the molarity of 2% by weight of aqueous solution of H2S4(molecular weight = 98)

    asked on July 5, 2013
  13. Geometry

    The area of a regular octagon is 35 cm². What is the area of a regular octagon with sides three times as long?

    asked on April 2, 2012
  14. Physics 11 - Dynamics

    While standing on a horizontal frictionless surface a 50.0 kg student pushes against a wall with an average force of 125 N to the right for 0.110 s. Calculate the velocity of this student at 1.110 s. My answer: Vf = 0.275 m/s My solutions book has Vf =

    asked on March 19, 2013
  15. Math

    a 6.5 ounce can of tuna for $1.39 or a 3 ounce can of tuna for $0.65. the 6.5 ounce can of tuna costs ________ the 3 ounce can of tuna costs __________ the ______ ounce can of tuna is the better buy

    asked on December 9, 2015
  16. science

    An empty relative density bottle weighs weighs 65g when filled with a liquid and 75g when with water.caculate the density of the liquid.

    asked on January 31, 2013
  17. math

    the minute hand of a clock is 6cm far does the end of the hand travel is 35minute

    asked on March 3, 2018
  18. physics

    (1) a car travelling at a constant speed of 20ms-1 overcomes a constant frictional resistance of 300N. What is the horse power of the engine? ( take 1h.p = 3/4 kw)

    asked on November 21, 2016
  19. English

    Why traditional african marriage is an advantage for men only not, women

    asked on April 21, 2014
  20. Probability

    A computer password is required to be 9 characters long. How many passwords are possible if the password requires 2 letter(s) followed by 7 digits (numbers 0-9), where no repetition of any letter or digit is allowed?

    asked on March 25, 2016
  21. 2D Animation

    Lesson 3: Wrapping Up Unit 10 2-D Animation Unit 10: Character Animation there are 15 questions plz help me

    asked on April 14, 2019
  22. Chemistry Help

    If it takes three "breaths" to blow up a balloon to 1.2 L, and each breath supplies the balloon with 0.060 moles of exhaled air, how many moles of air are in a 3.0 L balloon? i am trying to use v1/n1=v2/n2 but i am stuck, can u help? thank you

    asked on October 15, 2010
  23. Social Studies

    Victory at which Battle convinced the British to help the Americans? I'm thinking its the Battle of Saratoga

    asked on August 14, 2017
  24. Algebra

    a. For the first company, express in words the amount the cab company charges per ride and per mile. Charge per ride: $3 per mile $0.50 b. Write an equation in slope-intercept, point-slope, or standard form. Explain why you chose the form you did.

    asked on December 12, 2017
  25. 2D Animation

    a weighting of 100 in the weight painting mode is represented by which of the following the color blue the ratio 1:1 the color red the ratio 2:1

    asked on April 14, 2019
  26. physics sl

    A dead dog of mass 2.2 kg and an initial speed of 5.5 m.s-1 slides along a rough horizontal surface and stops after travelling 4.2 m. calculate the frictional force between the dog and the surface (Think of the work the friction has to do to stop the dog

    asked on October 4, 2015
  27. math

    If the wheel of a bicycle has a diameter of 60cm, calculate how far a cyclist will have travelled after the wheel has rotated 100 times.

    asked on January 15, 2015
  28. CHEM

    on a heating curve graph...what factors determine the lengths of the flat regions of the graph and slope of the curve between the flat regions

    asked on January 21, 2010
  29. math

    Write a system of equations, three equations/three unknowns, that has (1, 2, 3) as the solution. for this can I just write any random coefficient and then put that as equal to 1,2 or 3? or if not what type of math would I use?

    asked on November 6, 2017
  30. Science

    How is the equator similar to the prime meridian?

    asked on January 6, 2018
  31. physics

    A stone of mass 0.7kg is projected vertically upward with a speed of 5m/s.calculate the maximum height reached. [Take g=10m/s^2 and neglect air resistance]. "

    asked on February 13, 2016
  32. chem

    What volume of 0.200 M H2SO4 will be needed to neutralize 50mL of 0.178 N NaOH? i don't even know how to start

    asked on December 14, 2009
  33. chemistry

    Phosgene (COCl2) is an extremely poisonous gas that was used extensively in World War I as a chemical warfare agent. At 300oC, phosgene decomposes to carbon monoxide and chlorine with a Kp = 6.8 x 10-2. Calculate the pressure in the vessel at equilibrium

    asked on October 13, 2008
  34. Algebra

    The first term of an A.P is 3 and the fifth term is 9.Find the number of terms in the progression if the sum of the progression is 81.

    asked on February 19, 2019
  35. math

    During the summer holidays,your brother earns extra money mowing lawns.He mows 6 lawns an hour and has 21 lawns to mow.How long will it take him?

    asked on April 7, 2015
  36. Math

    Austin pays $1.50 per day for high speed internet after paying the equipment fee of $35.00. Identify the constant of proportionality that relates his internet charges (y) to the number of days (x) he has internet.

    asked on December 30, 2016
  37. physics

    the earth is on average 150million km from the sun calculat its average speed in orbit

    asked on November 30, 2018
  38. math

    Find the perimeter of the given triangle. Round your answer to the nearest tenth if necessary. ∆BCH, if ∆CBH ∼ ∆FEH, ADEG is a parallelogram, BH = 4, HE = 7, EF = 25, and HF = 24.

    asked on December 16, 2017
  39. science

    'Imagine there is a tank of unknown gas that contains 53.31% carbon, 11.18% hydrogen, and 35.51% oxygen by mass. At 35.0 °C and 0.455 bar, 2.00 L of the gas has a mass of 3.20 g. Using this information, answer the following questions. a.) What is the

    asked on October 27, 2014
  40. Algebra

    Determine whether the graphs of the equations are parallel, perpendicular, or neither. y=-x+2 y=-x-3

    asked on May 5, 2008
  41. science

    how would you determine the relative density of kerosene using a relative density bottle

    asked on January 11, 2019
  42. Chemistry

    What is the oxidation half reaction for the following equation: Cr2O7^-2 +Fe+2 - - > Cr^+3 + Fe^+3 Cr^+3 - - > Cr2O7^-2 Fe^+2 - - > Fe^+3 Fe^+3 - - > Fe^+2 Cr2O7^-2 - -> Cr^+3***

    asked on May 31, 2016
  43. math

    What are the steps to show the quotient in simplest form? 0.000027/0.000009

    asked on September 30, 2015
  44. College Physics

    The point charges in Figure 17.41 are located at the corners of an equilateral triangle 25.0 cm on a side, where qb = +12.0 µC and qc = -4.50 µC. (Assume that the +x-axis is directed to the right.) (a) Find the electric field at the location of qa.

    asked on March 24, 2014
  45. AP BIO

    If a particular experiment were known to have a transformation efficiency of 3 x 103 bacteria/ìg of DNA, how many transformant colonies would be expected to grow on the LB/amp/ara plate?

    asked on April 7, 2010
  46. Maths

    The total surface area of a rectangular solid is 130cm, if the solid is 7cm long and 5cm wide. Calculate the height

    asked on February 7, 2019
  47. Chemistry

    In the zinc-copper cell, Zn(s) | Zn^+2(1M) || Cu^+2(1M) | Cu(s), which electrode is negative? Cu^+2 Cu(s) Zn(s)*** Zn^+2

    asked on May 31, 2016
  48. Economics!

    Suppose a chemical company is in a perfectly competitive industry and has a short run total cost curve of TC = q3 + 5q2 + 10q + 10 and a short run marginal cost of SMC = q2 + 10q + 10. At the price of 49, how many will be produced?

    asked on May 4, 2016
  49. math

    The perimeter of a rectangular concrete patio is 38 meters. The area is 90 square meters. What are the dimensions of the patio?

    asked on January 14, 2016
  50. Chemistry

    1. You have gone back in time and are working with Dalton on a table of relative masses. Following are his data: 0.602g gas A reacts with 0.295g gas B 0.172g gas B reacts with 0.401g gas C 0.320g gas A reacts with 0.374g gas C a) Assuming simplest formulas

    asked on September 6, 2010
  51. physics

    A water molecule consists of an oxygen atom and two hydrogen atoms. Oxygen has a mass of 16 atomic units (u) and each hydrogen has a mass of 1 u. The hydrogen atoms are each at an average distance of 96 pm ( 96 x 10 -12 m) from the oxygen atom, and are

    asked on October 13, 2008
  52. Math

    In a circle whose center is O, arc AB contaisn 100 degrees. Find the number of degrees i angle ABO?

    asked on July 24, 2017
  53. Chemistry

    Wha volum of steam is produced when log of propyrie is burnt in excess oxygen at s.t.p?

    asked on June 21, 2013
  54. physics

    Alley club-ax consists of a symmetrical 8 kg stone attached to the end of a uniform 2.5 kg stick that is 98 cm long. The dimensions of the club-ax are that the stcik is 80 cm across and the stone is tied to the stick is 18 cm long. How far is the center of

    asked on October 13, 2008
  55. Calculus

    At noon, ship A is 20 nautical miles due west of ship B. Ship A is sailing west at 23 knots and ship B is sailing north at 17 knots. How fast (in knots) is the distance between the ships changing at 5 PM? (Note: 1 knot is a speed of 1 nautical mile per

    asked on March 1, 2010
  56. English III (11th grade)

    Lana woke up, curled in a corner of the seat at the back of the train. She lifted the shade to see that the sun had hidden itself in a bank of clouds fluffy as the eiderdown her mother had wrapped her in as a child. Her darling Ted, a military man with a

    asked on May 12, 2014
  57. Math

    You write 5 1⁄2 pages of a report in 2 1/3 hours. What is the average number of pages you write per hour?

    asked on December 10, 2017
  58. Chemistry

    A compound on analysis as 87:8% c,12:2%h determine its empirical formular&molecular formular given mass=56gmol

    asked on January 25, 2016
  59. physics

    A cube of balsa wood (side length = 0.25 m) is tied with a string to the bottom of a waterfilled container. The wood is completely immersed. What is the tension in the string?

    asked on July 29, 2013
  60. chemistry

    what will haprn if ammonium chloride solution is used to standardize potassium tetraoxamaganate VII solution instead of ammonium iron II sulphate

    asked on May 11, 2016
  61. Science

    A compound on analysis as 87:8% c,12:2%h determine its empirical formular&molecular formular given mass=56gmol

    asked on January 25, 2016
  62. Math

    2 vertices of a triangle are 1,-4 and 6,-4. List 2 possible coordinates of the third vertex so that the triangle has an area of 20 units.

    asked on April 24, 2014
  63. math

    the bearing of Y from X is 160¤ and the bearing of Z from Y is 060¤. find the bearing of X from Z.

    asked on May 11, 2013
  64. math

    A diver on a platform 40 feet in height jumps upward with an initial velocity of 5ft/s. His height in h feet after t seconds is given by the function h=-16t^2+5t+50. a. What is his maximum height? I got 50.39 b. How long will it take him to reach the

    asked on March 25, 2015
  65. math/physics

    Estimate the percentage savings in the fuel bill if the thermostat is set back from 68 degrees F to 50 degrees F for 12 hours of the day, and left at 68 degrees F for the other 12 hours, assuming an outside temperature of 15 degrees F all day.

    asked on April 26, 2013
  66. Chem 101

    Consider the reaction of 82.0 g of oxygen as follows: 4Fe + 3O2 2Fe2O3 How many moles of oxygen react? How many moles of iron must react? How many moles of product form? What mass of product forms?

    asked on August 26, 2010
  67. chem

    why do elements in the same family generally have similar properties?

    asked on January 24, 2010
  68. natural disasters

    how can the magnatic record inside a valcanic roskbe used to determine the latitude at which the lava cooled?

    asked on September 7, 2009
  69. math

    Using the vertices: B(-9,1), E(2,3), F(12, -2), G(1,-4). Determine whether BEFG is a rhombus, a rectangle, or a square. List all that apply and show the steps

    asked on February 1, 2018
  70. Arithmetic

    A geometric series has a positive common ratio of r. The series has a sum to infinity of 9 and the sum of the first two terms is 5. Find the first four terms of the series.

    asked on November 25, 2017
  71. math

    calculate the volume of the solid when the composite of a cube of edge is 28cm and the square -based pyramid of it height is 16cm

    asked on April 18, 2016
  72. Physics 11

    Displacement is given by x=2+3t+4t². Find the value of instantaneous acceleration.

    asked on March 13, 2013
  73. math

    a wheel is making 300rev/min about its center, calculate the angular velocity of any point on the wheel about the center. also find the speed of a point at a distance of 2cm from the center.

    asked on June 24, 2012
  74. physics

    Uniform rod of weight 10N and length 5m is supported by ropes from points P and Q. The rope at P is attached 1.0m from end M and the rope at Q is attached 0.25m from end O. find the tensions Tp and Tq

    asked on February 24, 2011
  75. s

    unscramble "elasel" in french; unscramble "ionmaes" in french. Thank you

    asked on December 17, 2009
  76. physics

    An athlete at the gym holds a 4.33 kg steel ball in his hand. His arm is 75.0 cm long and has a mass of 5.28 kg. What is the magnitude of the torque about his shoulder if he holds his arm straight out to his side, parallel to the floor? Responses Physics -

    asked on October 13, 2008
  77. Math

    I am 10years old my sister is 4years,in how many years shall i be twice as old as she will be?

    asked on September 3, 2017
  78. statistics

    a survey from teeneage research unlimited found that 30% of teenage consumers receive their spending money from parttime jobs. If 5 teenagers are selected at random, find the probability that at least 3 of them have part time jobs

    asked on March 22, 2017
  79. physics

    A piece of copper of mass 40 grams at 20 degrees Celsius is placed in a copper calorimeter of mass 60 grams containing 50 grams of water at 10 degrees Celsius .ignoring heat losses,what will be the final steady temperature after stirring?(specific heat

    asked on May 29, 2016
  80. physic

    Two forces 5N and 10N act on a body in the direction due North and east respectively at an angle 75 degree. Calculate the resultant force of the inclined angle.

    asked on May 15, 2016
  81. finite math

    The Megabuck Hospital Corp. is to build a state-subsidized nursing home catering to homeless patients as well as high-income patients. State regulations require that every subsidized nursing home must house a minimum of 760 homeless patients and no more

    asked on March 8, 2014
  82. math

    what rate of annual simple interest is equivalent to 9% per annum compounded semi-annually for 3 years

    asked on June 24, 2012
  83. free will baptiste

    i am trying to help my daughter with home work but don't understand question. Show 30, Broken Key is 3. Show several ways. if am able to solve one i can help her to the rest.

    asked on September 28, 2011
  84. Physics

    A car travels 2.06 km in the x-direction, then turns left 70.3 degrees to the original direction and travels an additional distance of 4.23 km. Calculate the x component of the car’s net displacement. Let : d1 = 2.06 km, theta = 70.3 degrees , and d2 =

    asked on February 1, 2011
  85. economics

    Given that the monopolist demand curve is Qd=200-2P, TC=#900 and P= #55. What is the total profit?

    asked on April 9, 2010
  86. chem

    what does the heating curve of ethanol look like? im really confused about this...

    asked on January 21, 2010
  87. physics

    A pendulum consists of an object of mass 1.07 kg that hangs at the end of a massless bar, a distance 1.14 m from the pivot point. Calculate the magnitude of the torque due to gravity about the pivot point if the bar makes an angle of 22° with the

    asked on October 13, 2008
  88. math

    In a random sample of 200 students who were asked their favorite color, it was found that twenty more students liked blue than purple and eight fewer liked green than blue. Find the number of students who chose each color as their favorite. I posted this

    asked on November 6, 2017
  89. life orientation

    indetify three courses are interested after grade 12

    asked on March 13, 2016
  90. logics in programming

    for A=1 to 30

    asked on December 9, 2015
  91. Elective maths

    A particle P of mass 7kg is suspended by two inextensible strings AP,BP of lengths 40cm and 75cm respectively. The ends, AP of the strings are attached to two point at the same level, whose distance apart is 85cm. Find angle APB and the magnitude of the

    asked on October 6, 2015
  92. Chemistry

    If an aquarium tank holds 100 litres of water, calculate how much heat energy would be required to heat the tank from 18.2 Degrees(C) to 32 Degrees(C)

    asked on September 11, 2015
  93. Science

    4g of an organic compound gave 2.34g of carbon 0.16g of hydrogen 0.46g of nitrogen 1.04g of oxygen.what is the empirical formula

    asked on June 22, 2015
  94. physicss

    state the precision of the measured quantities 1. 0.07 m 2. 908 s 3. 7.60 L 4. 0.005 0 mm answers: 1. 0.01 m 2. 1 s 3. 0.01 L 4. 0.0001 mm i do not understand this , please explain it to me

    asked on February 4, 2015
  95. physics

    state the precision of the measured quantities 1. 353g 2. 6.00cm please explain

    asked on February 4, 2015
  96. Economics

    Can someone help me with #1 - a,b,c it is on economics20145.weebly

    asked on December 11, 2014
  97. Physics

    A person pulls a crate with 120 N of force against 100 N of friction a distance of 5 meters. Find the energy the person expends pulling the crate, the amount of energy converted to heat via friction, and the increase in the kinetic energy of the crate.

    asked on November 20, 2012
  98. ap chemistry :(

    consider the reaction C6H14 + 9.5O2 yields 6CO2 + &H2) at constant pressure. which response is true? 1. work may be done on or by the system as the reaction occurs, depending upon the temperature. 2. work is done on the system as the reaction occurs. 3. no

    asked on October 18, 2012
  99. Probability and Statistics

    Can someone tell me what formula I should use? The number of milligrams of tar in filtered and unfiltered cigarettes is being compared. The following cigarettes are pulled to be part of the samples: Filtered: bunch of data Unfiltered: bunch of data The

    asked on November 30, 2010
  100. Chem 101 science

    Rank the following samples in number of atoms from least to greatest. a) 2 mol of K atoms b) 48 g of S c) 27 g of Be d) 50 g of Na

    asked on August 26, 2010


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