Emily

Popular questions and responses by Emily
  1. Honors Chemistry

    "How many grams of NH3 can be produced from the reaction of 28 g of N2 and 25 g of H2? N2 + 3H2 ---> 2NH3 ==> 28 g N2 x (1 mol N2/14.0 g N2) x (2 mol NH3/1 mol N2) x ( 17.0 g NH3/ 1 mol NH3) = 68 g NH3 25 g H2 x ( 1mol H2/2.0 g H2) x (2 mol NH3/3 mol H2) x

    asked on November 8, 2009
  2. Physics

    Starting from rest, a 4.0-kg body reaches a speed of 8.0 m/s in 2.0 s. What is the net force acting on the body?

    asked on January 25, 2012
  3. Math

    A bag contains 6 red marbles, 3 white marbles, and 7 blue marbles. You pick a marble without looking. Find the probability of drawing a white marble. Can someone please explain how I would work this out?

    asked on May 21, 2018
  4. Chemistry

    A sample of argon gas at STP occupies 56.2 liters. Find the number of moles of argon and the mass in the sample

    asked on April 27, 2013
  5. Calculus

    A solid is formed by adjoining two hemispheres to the ends of a right circular cylinder. An industrial tank of this shape must have a volume of 1600 cubic feet. The hemispherical ends cost twice as much per square foot of surface area as the sides. Find

    asked on November 3, 2016
  6. Math

    An auditorium has 50 rows of seats. The first row has 20 seats, the second row has 21, the third row has 22 seats, and so on, each row having one more seat than the previous row. How many seats are there all together? a. write 2 different expressions for

    asked on October 29, 2010
  7. Chemistry

    Write a balanced net ionic equation (include physical states) for the following reaction: Fe(NO3)3(aq) + LiOH(aq) → LiNO3(aq) + Fe(OH)3(s)

    asked on June 27, 2011
  8. Math

    Mike had x pieces of candy. He kept pieces 15 for himself and equally divided the remaining pieces among his 6 friends. How many pieces of candy did each of his friends get?

    asked on August 3, 2020
  9. Physics

    Two rugby players are running towards each other. They are 37 m apart. If one is accelerating from rest at 0.5 m/s^2 and the other was already moving at 3.1 m/s and maintains her speed, a)how long before they crunch together? b)How fast was the

    asked on October 2, 2010
  10. Science

    Calculate the quantity of energy required to change 3.00 mol of liquid water to steam at 100°C. The molar heat of vaporization of water is 40.6 kj/mol

    asked on March 25, 2013
  11. math

    The busy Mother pours herself a coffee into a paper cup before making her way to the amusement park. The coffee temperature is 35 C when the cup is placed on the kitchen counter. The Mother needs to tend to her son and her coffee is forgotten. When the

    asked on April 6, 2018
  12. Geometry probability

    Betty picks 4 random marbles from a bowl containing 3 white, 4 yellow, and 5 blue marbles. The probability that exactly 1 of the 4 marbles drawn is blue is _____ (I know that the probability is 5/12 and that simplifies to 0.4166 but that is not one of the

    asked on January 24, 2017
  13. Math

    A son is 8 years old. His father is five times as old. How old was the father when his son was born?

    asked on July 22, 2020
  14. Life sciences, Business studies,Maths lit and CAT

    With Life sciences, Business studies,Maths lit and CAT, what can I study after matric? Which career field should I follow?

    asked on May 21, 2014
  15. Math

    Several games were played between two basketball teams: the Tigers and the Bears. The Tigers won the first game by two points. A total of 90 points was scored during the game. How many points did each team score?

    asked on July 20, 2020
  16. Math

    The 10th term of an arithmetic series is 34, and the sum of the first 20 terms is 710. Determine the 25th term.

    asked on November 19, 2010
  17. algebra

    What is B if the graph of the equation 3x=By+2 is perpendicular to the graph of 3y=-2x+4

    asked on July 25, 2020
  18. Science

    A tube at both ends has a length of 30 m A. What is the length of a tube open on one end tha has the same fundamental frequency B what is the frequency

    asked on July 21, 2020
  19. chemistry

    The formation constant* of [M(CN)4]2– is 7.70 × 1016, where M is a generic metal. A 0.170-mole quantity of M(NO3)2 is added to a liter of 1.040 M NaCN solution. What is the concentration of M2 ions at equilibrium?

    asked on March 25, 2016
  20. Math

    1) There were a total of 840 guests at a wedding dinner. 60% of them were adults, and the rest were children. Some boys left before the dessert was served. As a result, the percentage of adults increased to 70%. How many boys left before the dessert was

    asked on July 24, 2014
  21. Calc

    A baseball is thrown upwards from a height of 2 meters with an initial velocity of 10 meters per second. Use the fact that -9.8 meters per second squared is constant acceleration due to gravity to answer the following: The maximum height of the ball The

    asked on November 1, 2016
  22. Calc

    A buoy oscillates in simple harmonic motion as waves go by. The buoy moves a total of 3.5 feet from its low point to its high point and it returns to its high point every 10 seconds. What is the equation that describes this motion if it reaches its high

    asked on July 30, 2008
  23. Calculus

    A pencil cup with a capacity of 25π in.3 is to be constructed in the shape of a right circular cylinder with an open top. If the material for the side costs 5/8 of the cost of the material for the base, what dimensions should the cup have to minimize the

    asked on March 16, 2020
  24. World History

    Why did rogue states become more prominent following the Soviet Union’s collapse? I know what a rogue state is but I don't know why it is involved with the Soviet Union and their collapse. I also know that it has something to do with the Cold War. Can

    asked on August 28, 2018
  25. Math (geometry)

    A diagonal of one cube is 2 cm. A diagonal of another cube is 4*sqrt3 cm. The larger cube has volume 64 cubic cm. Find the volume of the smaller cube. --------------------------------------------------------------------------------------------------- There

    asked on April 3, 2008
  26. Science

    After 2 turning fork are simultanesly struck, one hears 4 beats per second. If the frequency of one tuning fork is 480 Hz find the possible frequencies of the other tuning fork

    asked on July 21, 2020
  27. Physics

    Determine the stopping distances for an automobile with an initial speed of 95km/h and human reaction time of 1.0s: (a) for an acceleration a= -5.2m/s^2 (b) for a= -6.7m/s^2

    asked on July 10, 2011
  28. math

    It is a beautiful sunny day at the fair. The U.V. index for this day is 8, or high, so sunscreen is a must for all the young folk. The effectiveness of sunscreen is indicated by the sunscreen protection factor (SPF). The higher the SPF number the fewer

    asked on April 6, 2018
  29. physics!

    In a scene in an action movie, a stuntman jumps from the top of one building to the top of another building 4.0m away. After a running start, he leaps at an angle of 15 degrees with respect to the flat foor while traveling at a speed of 5.0 m/s. will he

    asked on December 9, 2008
  30. math

    Find all the values of x in the interval [0,2π] that satisfy the equation: 8sin(2x)=8cos(x)

    asked on September 13, 2012
  31. Calculus

    Find the slope and y-intercept of the line through the point (6,2) that cuts off the least area from the first quadrant.

    asked on November 26, 2017
  32. biology

    which of the following statements about enzymes is NOT true? A. enzymes work best at a specified pH B. all enzymes have the same shape as their substrates. C. enzymes are proteins D. the shape of an enzyme allows it to do its job. im pretty sure its A. Am

    asked on May 12, 2017
  33. Physics

    A rotating uniform-density disk of radius 0.6 m is mounted in the vertical plane. The axle is held up by supports that are not shown, and the disk is free to rotate on the nearly frictionless axle. The disk has mass 5.8 kg. A lump of clay with mass 0.5 kg

    asked on April 14, 2013
  34. Chemistry

    Consider the following hypothetical aqueous reaction: A (aq)-->B(aq)}. A flask is charged with 0.065 (mole) of A in a total volume of 100.0 (mL}. The following data are collected: Time (min) 0 10 20 30 40 Moles of A .065 .051 .042 .035 .031 Calculate the

    asked on February 9, 2012
  35. Math

    Determine the equation of the parabola with roots 2+sqrt(3) and 2-sqrt(3), and passing through the point (2,5).

    asked on August 23, 2010
  36. ap chem

    consider the molecules PF3 and PF5. b]is the PF3 molecule polar or is it nonpolar. explain C] on the basis of bonding principles, predict whether each of the following compounds exists. In each case explain your prediction. (i) NF5 (ii) AsF5 2. explain why

    asked on January 23, 2007
  37. math

    If the measure of angle 1 is 123 degrees, find the measure of

    asked on June 7, 2010
  38. Chemistry (PLZ HELP)

    Hydrazine, N2H4(aq), is used in the preparation of polymers, pharmaceuticals and rocket fuel. Hydrazine has alkaline properties similar to ammonia and will act as a weak base. Given that a 100 mL sample of 0.10 mol/L hydrazine solution has a pH of 10.55 at

    asked on May 23, 2018
  39. Earth space science

    During which step in the Can Crush Lab did water vapor condense inside the can? A. The can was filled nearly to the top with water. B. The can was placed on the hot stove burner for several minutes. C. The can was removed from the hot stove burner. D. The

    asked on August 27, 2017
  40. French

    Is the word 'maths' masculine or feminine?

    asked on September 29, 2008
  41. Ap Chem

    explain each of the following observations using principles of atomic stucture and/or bonding. a] potassium has a lower first-ionization engergy than lithium. b] the ionic radius of N3- is larger than that of O2-. c] a calcium atom is larger than a zinc

    asked on January 23, 2007
  42. Chemistry

    How would the following affect the calculated value of neutralizing power of antacid (make it higher, lower or no effect)? [The lab uses the back titration technique] 1) The solution mixture of reacted antacid and excess of HCl spattered out the flask

    asked on November 6, 2017
  43. Chemistry

    Which pair of compounds will form a solution? A) Benzene (C6H6) and Hexane (C6H14) B) Na2SO4 and Benzene C) NaCl and Hexane

    asked on April 20, 2012
  44. Calc BC

    Figure out the 35th derivative for xsinx. You have to do a few derivatives by hand to figure our a pattern and then predict the 35th one

    asked on September 11, 2013
  45. cochise

    How many kilocal are required to increase the temperature of 15.6 g of iron from 122 °C to 355 °C? The specific heat of iron is 0.450 J/g °C

    asked on April 13, 2012
  46. Statistics

    A gambler offers to let you play the following game: he will roll two (fair) dice. If the sum of the two dice is 7, you will lose $8. If the sum of the two dice is 2, you will lose $7. For any other roll, you will win $4. What is the expected value of this

    asked on December 7, 2018
  47. math

    6. The half-life of a certain radioactive material is 32 days. An initial amount of the material has a mass of 361 kg. Write an exponential function that models the decay of this material. Find how much radioactive material remains after 5 days. Round your

    asked on May 11, 2016
  48. English grammar

    In the following sentence identify the function of the infinitive (phrase). Is it too expensive to travel to Europe? My list of answers contains: Adverb, subject, direct object, adjective, object of preposition, and predicate noun. I chose predicate noun.

    asked on July 21, 2015
  49. chemistry

    How many moles of Na2CO3 would be needed to react with 750 mL of 0.250 M H2SO4 solution?

    asked on April 1, 2011
  50. chemistry

    Given that the specific heat capacities of ice and steam are 2.06 J/g°C and 2.03 J/g°C, the molar heats of fusion and vaporization for water are 6.02 kJ/mol and 40.6 kJ/mol, respectively, and the specific heat capacity of water is 4.18 J/g°C, calculate

    asked on February 16, 2010
  51. Math

    Suppose the polynomial f(x) has the following end behavior: as x→∞, f(x)→−∞, and as x→−∞, f(x)→−∞. Which of the following polynomials could represent f(x)? There may be more than one correct answer. Select all correct answers. a.

    asked on March 19, 2020
  52. Science

    Study the scenario. An object is at rest. At five seconds, someone comes over and pushes the object with a force of 3 N to the right. Which of the following choices describes the force needed to keep the object in static equilibrium? a. A force of 3 N to

    asked on September 12, 2018
  53. arithmetic geometric

    Determine whether each sequence is arithmetic geometric or neither if the sequence is arithmetic give the common difference if geometric give the common ratio 1. 6,18,54,162, 2. 4,10,16,22 3. 1,1,2,3,5,8 4. 625,125,25,5 5. 5,8,13,21,34

    asked on July 15, 2018
  54. Math

    It is a beautiful sunny day at the fair. The U.V. index for this day is 8 or higher so sunscreen is a must. The effectiveness of sunscreen is indicated by the sunscreen protection factor (SPF). The higher the SPF number the less U.V. rays can penetrate to

    asked on April 9, 2018
  55. Math

    Find the missing length. Round to the nearest tenth of necessary. It is a right triangle with side a being 8 ft and side b being 21ft what is the length of the 3rd side? A 441 B 22.5 C 64 D 19.4* Am I right and please explain I am a little confused.

    asked on February 14, 2019
  56. math

    Show that a function f(n)= 2n^3+n^2+6n+3 always produces a number that is divisible by an odd number greater than 1, for any natural number, n. 2n^3+n^2+6n+3 = n^2(2n+1) + 3(2n+1) = (2n+1)(n^2 + 3) what's next?

    asked on December 14, 2017
  57. Physics

    The place kicker on a football team kicks a ball from ground level with an initial speed of 8.30 m/s at an angle of 19.0° above the horizontal. How long is the ball in the air before it lands on the ground again? You may neglect air resistance.

    asked on February 26, 2017
  58. American Government

    Why do presidents prefer federal judges who tend to agree with their views?

    asked on January 22, 2017
  59. chemistry

    A major component of gasoline is octane C8H18. When octane is burned in air, it chemically reacts with oxygen gas O2 to produce carbon dioxide CO2 and water H2O. What mass of octane is consumed by the reaction of 8.8g of oxygen gas? Round your answer to 2

    asked on August 9, 2016
  60. Math

    Mr.Adams had a coin collection including only nickels, dimes, and quarters He had twice as many dimes as nickels and half as many quarters as he had nickels. If the total face value of his collection was $300.00, how many quarters did the collection

    asked on July 14, 2016
  61. English Grammar - Clauses

    The following sentence contains _____. We like him as much as them. an adjective clause a noun clause an elliptical clause no subordinate clause I think "as much as them" is an adverb clause but since it's not an option, I'd choose "no subordinate clause."

    asked on July 30, 2015
  62. math- plz help

    The denominator of a fraction is greater than its numerator by 9. If 7 is subtracted from both its numerator and denominator, the new fraction equals 2/3. What is the original fraction?

    asked on January 20, 2013
  63. General Chemistry (Chem101)

    A chemist mixes two liquids A and B to form a homogeneous mixture. The densities of the liquids are 2.0514 g/mL for A and 2.6678 g/mL for B. When she drops a small object into the mixture, she finds that the object becomes suspended in the liquid; that is,

    asked on September 20, 2012
  64. Chemistry

    net ionic equation of Na2CO3+2HC2H3O2-->CO2+h2o+2Na2H3O2

    asked on September 1, 2010
  65. Geometry

    Find the value of the variable and VW if V is between U and W. UV=2,VW= 3x, UW=29 UV = r, VW = 6r, UW =42 UV = 4p - 3, VW = 5p, UW =15 UV = 3c+29, VW = -2c-4, UW = -4c Need a site to explain how to do these. Teacher not clear on explaining.

    asked on September 15, 2009
  66. Physics (check)

    A merchant in Katmandu sells you a solid gold 1-kg statue for a very reasonable price. When you get home, you wonder whether or not you got a bargain, so you lower the statue into a measuring cup and measure its volume. What volume will verify that it's

    asked on May 18, 2008
  67. Math grade 12

    A lighthouse with a rotating beam is located 500m south of a coastal cliff that runs west to east a) determine a relation for the distance from the lighthouse to the point the light strikes the cliff in terms of the angle of rotation x b) determine an

    asked on November 5, 2015
  68. Algebra

    A rectangular pool has a perimeter of 142 feet. The length is 25 feet longer than the width. Find the length and width of the pool.

    asked on March 5, 2015
  69. Math

    A farmer wishes to enclose a rectangular region with 196 meters of fencing in such a way that the length is twice the width and that the region is divided along its length into two equal parts. What is the length and width in meters?

    asked on September 17, 2013
  70. physics

    Piston 1 has a diameter of 0.643 cm. Piston 2 has a diameter of 4.59 cm. In the absence of friction, determine the force required on piston 1 necessary to support an object, m, with weight 1151 N. (Neglect the height difference between the bottom of the

    asked on October 27, 2012
  71. science

    A simple model for a person running a 100m race is to assume the sprinter runs with constant acceleration until reaching top speed, and then maintains that speed through the finish line. If a sprinter reaches their top speed of 11.2ms-1 in 2.15s, what will

    asked on September 4, 2012
  72. Calculus I

    Sketch the graph of f by hand and use your sketch to find the absolute and local maximum and minimum values of f. 18. f(x) = 1/x , 1 < x < 3 I can graph it just fine, but for my answer I got that the function has none of the above. Is this correct?

    asked on March 5, 2012
  73. Chemistry

    What will be the freezing point of a solution made by dissolving 5.25 g of naphthalene (C10H8) in 100.0 g benzene (C6H6?). The normal freezing point of benzene is 5.5°C and K f (benzene) is 5.12°C / m.

    asked on September 4, 2014
  74. Physics

    The brakes of a truck cause it to slow down by applying a retarding force of 8740 N to the truck over a distance of 1130 m. What is the work done by this force on the truck?

    asked on November 14, 2012
  75. Math

    The point (-8,3) lies on the terminal arm of angle theta in standard position. Determine the primary trigonometric ratios for angle theta and calculate the value of theta to the nearest degree. Only the sine ratio was positive, and when I used that to

    asked on December 27, 2010
  76. Chemistry

    Hydrogen cyanide is a highly poisonous, volatile liquid. It can be prepared by the following reaction. CH4(g) + NH3(g) → HCN(g) + 3 H2(g) What is the heat of reaction at constant pressure? Use the following thermochemical equations. N2(g) + 3 H2(g) → 2

    asked on October 31, 2010
  77. Math

    Given any right triangle with an acute angle theta, a) Explain why csc theta is always greater than or equal to 1 b) Explain why cos theta is always less than or equal to 1

    asked on October 8, 2010
  78. math

    The measure of an interior angle of a regular polygon is 135 degrees. Find the number of sides in the polygon. This is what I tried: 180(x-2)=135 [Interior Angle Sum Theorem] x-2=.75 x=2.75 That can't be right though. Help? Not sure about your formula.

    asked on March 27, 2007
  79. Math

    Lucy sang 4 songs. Every song was 5/8 minutes long. For how much time did she sing in total? Write your answer in simplest form. I think that you should do 5/8 x 4. Which equals 2.5. But if we need it in simplest form, that would be 5/2 or 2 and 1/2. Is

    asked on June 27, 2020
  80. Algebra 1

    Josh and Greg leave from the same place and travel the same route. Josh travels 2 hours and stops. Greg travels 5 hours at double Josh's rate. After five hours they are 256 miles apart. Find the rate and distance of each.

    asked on March 7, 2018
  81. physics

    An aluminum block absorbs 1.0 x 104 J of energy from the Sun when its temperature increases by 5.0 °C. What is the mass of the block? the specific heat capacity of aluminum is 920

    asked on December 19, 2017
  82. math

    Show that a function f(n)= 2n^3+n^2+6n+3 always produces a number that is divisible by an odd number greater than 1, for any natural number, n.

    asked on December 14, 2017
  83. physics

    15. During the opening kickoff of a college football game, the kicker kicks a football with an initial velocity of 27.5 m/s at an angle of 41° above horizontal. I. What is the time of flight for the ball? II. How far does it travel before hitting the

    asked on October 15, 2017
  84. physics

    A fighter jet is flying at Mach 3.2 in air of temperature 2 degrees C. What is the planes speed? I really don't understand how to do this question. I'd appreciate your help!

    asked on May 15, 2017
  85. math

    Which set of ordered pairs has point symmetry with respect to the origin (0, 0)? (9, 2), (-9, 2) (9, 2), (-9, -2) (9, 2), (9, -2) (9, 2), (2, 9)

    asked on February 16, 2017
  86. Calc

    Find the particular solution that satisfies the differential equation and the initial condition. f '(s) = 10s − 4s3, f(3) = 7 & f ''(x) = 6, f '(2) = 14, f(2) = 19

    asked on October 26, 2016
  87. math

    A billboard is 4.0 meters by 2.5 meters. A scale diagram of the billboard must fit in a space that is 15 centimeters by 12 centimeters. Write a reasonable scale for the scale diagram.

    asked on January 14, 2016
  88. Biology

    A patient has type AB blood. If they received a transfusion of type B blood, predict and explain what would happen

    asked on September 18, 2014
  89. Reading Skills

    This question is based on the following four sentences. 1. Netta and Jim argued over their views of free trade. 2. Netta and Jim had different views on free trade. 3. Netta and Jim were sharply split over the issue of free trade. 4. Netta and Jim refused

    asked on April 2, 2014
  90. Math

    Find the speed of a point on the rim of a 24cm diameter fly wheel which is turning at 2800 revolutions per minute. Give your answer in meters per second.

    asked on March 20, 2013
  91. Physics 1

    An astronaut in her space suit has a total mass of m1 = 76.9 kg, including suit and oxygen tank. Her tether line loses its attachment to her spacecraft while she's on a spacewalk. Initially at rest with respect to her spacecraft, she throws her oxygen tank

    asked on March 14, 2013
  92. Physics

    A solid metal ball and a hollow plastic ball of the same external radius are released from rest in a large vacuum chamber. When each has fallen 1 m, they both have the same 1. momentum. 2. inertia. 3. speed. 4. change in potential energy. 5. kinetic

    asked on December 2, 2012
  93. physics @ elena

    can you please help me with this one At serve, a tennis player aims to hit the ball horizontally. part a)What minimum speed is required for the ball to clear the 0.90m--high net about 15.0m from the server if the ball is "launched" from a height of 2.50m ?

    asked on April 22, 2012
  94. Trig

    A carousel with a 50-foot diameter makes 4 revolutions per minute. a) Find the angular speed of the carousel in radians per minute. b) Find the linear speed in feet per minute of the platform rim of the carousel.

    asked on April 1, 2012
  95. Chem

    A radiation lab orders 64uCi of P-32. After 42 days the activity of the sample is 8.0uCi. What is the life of P-32? Thanks

    asked on October 19, 2011
  96. Math (geometry)

    Find the area of the region inside the circle x^2+y^2=2 AND above the line y=1.

    asked on April 29, 2008
  97. math

    an isosceles triangle has perimeter of 15m. Find all integral possibilities for the lengths of the side in meters. Hint: the sum of the lengths of any two sides of a triangle must exceed the third side.

    asked on October 17, 2018
  98. AP Environmental Science-Ecosystems

    1. What are the physical products of cellular respiration? a. Oxygen and carbon dioxide b. Nitrogen and carbon c. Glucose and oxygen d. Glucose and water e. Water and carbon dioxide 2. If the biomass of flowers that support the butterflies was known to

    asked on October 17, 2017
  99. SCIENCE

    In a reaction 6.56g of Zinc reacted with excess dilute Hydrochloric acid Calculate the volume of hydrogen evolved at STP

    asked on September 6, 2017
  100. math

    8. The half-life of a certain radioactive material is 71 hours. An initial amount of the material has a mass of 722 kg. Write an exponential function that models the decay of this material. Find how much radioactive material remains after 17 hours. Round

    asked on May 11, 2016

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