Most popular questions and responses by alex
  1. Chem

    2HNO3(aq) + Sr(OH)2(aq) --> 2H2O(l) + Sr(NO3)2(aq)? Write the net ionic equation, including the phases. 2H^+(aq) + 2OH(aq) ---> 2H2O(l) Am I correct?

    asked on October 22, 2015
  2. Science

    what the difference between the structures of simple and complex

    asked on September 8, 2013
  3. Chemistry Help

    Write the net ionic equation for the reaction of calcium nitrate and sodium phosphate

    asked on November 14, 2012
  4. social studies

    1.  How did Washington handle the war between Britain and France?  (1 point) The U.S. formed an alliance with France to fight against Britain. The U.S. formed an alliance with Britain to fight against France.

    asked on November 1, 2016
  5. social studies

    explain how the civic virtues of the ancient romans inspired the founding fathers vision of how citizens should conduct themselves in the united states

    asked on October 27, 2016
  6. Language Arts

    1. Which sentence contains an opinion? (1 point) Thomas Jefferson supported American independence from Great Britain. He was a lawyer in his home state of Virginia. Jefferson authored the Declaration of Independence, the most important document in

    asked on December 11, 2015
  7. physics

    Driving in your car with a constant speed of v= 22 m/s, you encounter a bump in the road that has a circular cross-section, as indicated in the figure (Figure 1) . Part A If the radius of curvature of the bump is 52 m, find the apparent weight of a 66-kg

    asked on March 28, 2017
  8. Language Arts

    Act 2 of A Christmas Carol: Scrooge and Marley contains several messages. In a paragraph, explain how one of these messages are conveyed in the second act of the play. Include at least two details from the play to support your points.

    asked on May 15, 2017
  9. English

    stage directions are one element of a drama in a paragraph, define and provide an example of stage directions from "A surprising point of view". then analyze the stage directions. explain how these directions contribution to your understanding of "A

    asked on May 30, 2017
  10. Math

    When Scrooge tells Marley that Marley was always “a good man of business,” in Act 1, Scene 3 of A Christmas Carol: Scrooge and Marley, Marley responds, “BUSINESS!!! Mankind was my business. The common welfare was my business; charity, mercy,

    asked on April 27, 2016
  11. Algebra

    A toy rocket that is shot in the air with an upward velocity of 48 feet per second can be modeled by the function f(t)=-16t^2+48t , where t is the time in seconds since the rocket was shot and f(t) is the rocket’s height. What is the maximum height the

    asked on July 7, 2014
  12. math

    jose said all of the multiples of 8 are also multiples of 2. jamila said that all of the multiples of 8 are also multiples of 4. who is correct. Explain

    asked on November 16, 2011
  13. Physics

    A 50 Kg box rests on a horizontal surface. The coefficient of Static friction between the box and surface is 0.30. The coeffient of Kinetic friction is 0.20. What is the frictional force on the box if a 140 N horizontal push is applied to it. If a 175 N

    asked on April 30, 2016
  14. Physics

    Black Holes are suspected when a visible star is being noticeably pulled by an invisible partner that is more than 3 times as massive as the Sun. A red giant star is accelerated in a linear direction by gravity at 0.075 m/s2 towards an object that is 9.4

    asked on January 11, 2013
  15. Chemistry

    The measured potential of the following cell was 0.1776 volts: Pb|Pb2+(??M)||Pb2+(1.0M)|Pb Calculate the electrode potential of the unknown half-cell(anode). Not sure how to approach this, considering the molarity is unknown. There isn't a lot of space on

    asked on March 27, 2014
  16. Physics

    A pile driver lifts a 450 kg weight and then lets it fall onto the end of a steel pipe that needs to be driven into the ground. A fall of 1.5 m drives the pipe in 45 cm. What is the average force exerted on the pipe?

    asked on October 30, 2016
  17. Equation help 2 questions

    How many real number solutions does the equation have y=-4x^2+7x-8 none one two infinite How many real number solutions does the equation have y=3x^2+18x+27 none one two infinite Thank you!

    asked on April 2, 2014
  18. math

    Arley’s Bakery makes fat-free cookies that cost $1.60 each. Arley expects 40% of the cookies to fall apart and be discarded. Arley wants a 35% markup on cost and produces 200 cookies. Assume that Arley can sell the broken cookies for $1.50 each. What

    asked on June 20, 2016
  19. Chemistry

    Is Glucose soluble in HCl, NaOH and NaHCO3 because it's soluble in water? - I put soluble for all because it dissolves in water. Is p-toluidine soluble in HCl, NaOH, and NaHCO3? I put soluble in HCl, insoluble in NaOH and insoluble in NaHCO3. Is benzoic

    asked on May 25, 2010
  20. History

    What factors led the wartime alliance between the United States and the Soviet Union to disintegrate into the Cold War? What would be a great short answer?

    asked on September 15, 2015
  21. Reading Help

    In hanging fire the recurring line "and momma's in the bedroom with the door closed" creates a feeling of Confidence Connection Isolation Poverty Is it Isolation?

    asked on September 26, 2013
  22. 3rd grade math

    Tyrell says 753 rounds to 800. Sara says 753 rounds to 750. Who is correct? Explain.

    asked on September 14, 2011
  23. Math pizzazz worksheet answers

    Where willcampers sleep in 20 years?

    asked on March 8, 2009
  24. math

    Sixty-five randomly selected car salespersons were asked the number of cars they generally sell in one week. Fourteen people answered that they generally sell five cars; nineteen generally sell six cars; twelve generally sell seven cars; nine generally

    asked on April 17, 2018
  25. Math

    7. You are having a discussion about sequences with your classmate. She insists that the sequence 2, 3, 5, 8, 12 must be either arithmetic or geometric. Is she correct or incorrect? Explain.

    asked on April 17, 2015
  26. physics

    A test rocket is fired straight up from rest. The net acceleration is 20 m/s2 upward and continues for 4.0 seconds, at which time the rocket engines cease firing. What maximum elevation does the rocket reach?

    asked on June 15, 2015
  27. science

    1.the modern atomic model includes orbiting the nucleus. which of the following parts of dalton's was disproved by the discovery of the electron atoms are tiny particles atoms cannot be divided into smaller parts atoms have specific mass and size atoms

    asked on September 30, 2015
  28. History

    All day long and in all places I am always fastening upon you, stirring you and persuading you and reproaching you. You will not easily find another like me. Use the passage to answer the question. 1. In the passage, what Greek philosopher describes his

    asked on October 10, 2016
  29. Launguage arts

    Ebenezer Scrooge's changes between Act 1 and Act 2 of A Christmas Carol:Scrooge and Marley. In a essay, describe these changes and analyze how events in the plot shape Scrooge's character. Include details from the text in you essay. Someone help please!

    asked on May 30, 2017
  30. Chemistry

    For C2H5NH3+, write an equation that shows how the cation acts as an acid. Why is my answer wrong? CH2H5NH3^+(aq) + H2O(l) ---> CH2H5NH2(aq) + H3O+(aq)

    asked on November 6, 2018
  31. Microeconomics

    Larry, Moe, and Jo run the only saloon in town. Larry wants to sell as many drinks as possible without losing money. Jo wants the saloon to bring in as much revenue as possible. Moe wamts to make the largest possible profits. Using a single diagram of the

    asked on December 8, 2006
  32. Chemistry

    Calculate the pH and the pOH of an aqueous solution that is 0.025 M in HCl(aq) and 0.075 M in HBr(aq) at 25°C.

    asked on October 6, 2012
  33. Science: Chemistry

    Pentane (C5H12) burns in oxygen to produce carbon dioxide and water. C5H12(g)+8O2(g)→5CO2(g)+6H2O(g) Calculate the mass of CO2 that can be produced if the reaction of 38.5 g of pentane and sufficient oxygen has a 58.0 % yield.

    asked on November 15, 2015
  34. Polynomial help

    list 3 different ways to write 5^11 as the product of two powers.Explain why all of your expressions are equal to 5^11.

    asked on May 14, 2013
  35. Physics

    If a salmon swims straight upward in the water fast enough to break through the surface at a speed of 5 meters per second, how high can it jump above water?

    asked on February 9, 2014
  36. physics

    A 0.395-kg blue bead slides on a frictionless, curved wire, starting from rest at point in the figure below, where h = 1.50 m. At point , the blue bead collides elastically with a 0.650-kg green bead at rest. Find the maximum height the green bead rises as

    asked on October 18, 2012
  37. Chemistry

    A 100.0 mL sample of 0.20M HF is titrated with 0.10M KOH. Determine the pH of the solution after the addition of 100.0 mL of KOH. The Ka of HF is 3.5 x 10^-4

    asked on April 7, 2011
  38. chemistry

    Mixtures of helium and oxygen are used in scuba diving tanks to help prevent ‘the bends’, a condition caused by nitrogen bubbles forming in the bloodstream. If 95 L of oxygen and 25 L of helium at STP are pumped into a scuba tank with a volume of 8.0

    asked on March 20, 2013
  39. physics

    A skateboarder at a skate park rides along the path shown in (Figure 1) . a=2.7 m and b=1.0m If the speed of the skateboarder at point A is v=1.6m/s, what is her speed at point B? Assume that friction is negligible.

    asked on April 10, 2017
  40. English

    I don't quite understand the meaning of the story "Score/Score" by Phyllis Gotlieb. I can't seem to find much about it on the internet.

    asked on October 6, 2009
  41. Chemistry

    I have a question about this one 2N2O(g) ⇋ O2(g) + 2N2(g), what happens to the equilibrium position if the pressure decreases? Is going to shift to the right or to the left???

    asked on October 21, 2012
  42. Chemistry

    CO(g) effuses at a rate that is ______ times that of Xe(g) under the same conditions.

    asked on November 19, 2015
  43. Equation help

    A physics student stands at the top of a hill that has an elevation of 56 meters. he throws a rock and it goes up into the air and then falls back past him and lands on the ground below. The path of the rock can be modeled by the equation y=0.04x^2+1.3x+56

    asked on April 2, 2014
  44. Expression Help

    simplify the following expression 1/4 *fraction* (24-16x) Answers 6+4x 6+4 6-4x 6-4 Is it A?

    asked on September 24, 2013
  45. French

    3 - Au marché The new employee can't get anyone's order right. Say what each customer asked for and what the employee gave them. Modèle-je / des frites J'ai demandé des frites, mais il m'a donné du pain. 1. Malika / une pêche Malika demande une peche,

    asked on February 18, 2015
  46. Geometry

    I need help!!! a hemispherical bowl with radius 25cm contains water whose depth is 10cm. what is the water's surface area

    asked on March 31, 2014
  47. Math help

    Eric and Mark went to a ball game and visited the concession stand. They each got a hot dog, and mark got a large soda and a bag of peanuts. Eric had a coupon for 3$ off the cost. Mark Paid for the rest, which came to 11.50. Peanuts cost 4$, and a hotdog

    asked on October 7, 2013
  48. Physics

    A girl of mass 55 kg throws a ball of mass 0.8 kg against a wall. The ball strikes the wall horizontally with a speed of 25 m/s, and it bounces back with the same speed. The ball is in contact with the wall 0.05 s. What is the average force exerted on the

    asked on March 30, 2012
  49. Physics

    Six dogs pull a two-person sled with a total mass of 280 kg. The coefficient of kinetic friction between the sled and the snow is 0.080. The sled accelerates at 0.65 m/s2 until it reaches a cruising speed of 15 km/h. What is the team's maximum power output

    asked on October 30, 2016
  50. art

    setting up a photograph to control the lighting, the subjects position, and the angle of the photograph is an example of which artistic technique A.) improvisation B.) staging C.) photo editing d.) cropping

    asked on May 29, 2015
  51. Physics

    A 500.0 g bird is flying horizontally at 2.25 m/s, not paying much attention, when it suddenly flies into a stationary vertical bar, hitting it two-thirds of the way up from the bottom. The bar is uniform and very thin, is 0.750 m long, has a mass of 1.50

    asked on November 29, 2014
  52. math

    Suppose someone gives you 8 to 2 odds that you can not roll two even numbers with the roll of two fair dice. This means you win $8 if you succeed and you lose $2 if you fail. What is the expected value of this game to you? Should you expect to win or lose

    asked on September 15, 2014
  53. Reading Help

    Think about the rites of passage that individuals confront in the following literature The bass, the river, and Shelia Mant by W.D Wetherell Oranges by gary Soto I have no idea what im supposed to do here. Please help me.

    asked on September 26, 2013
  54. Chemistry

    Determine the solubility of a sodium sulfate, Na2SO4, in grams per 100g of water, if 0.94 g of Na2SO4 is dissolved in 20 g of water to make a saturated solution.

    asked on May 3, 2013
  55. Statistics

    A person's level of blood glucose and diabetes are closely related. Let x be a random variable measured in milligrams of glucose per deciliter (1/10 of a liter) of blood. Suppose that after a 12-hour fast, the random variable x will have a distribution

    asked on June 20, 2010
  56. Math

    Its area is given as 18,900 cm2 and the width as 1.8 m. What is the backboard’s length in metres? m

    asked on April 27, 2016
  57. EPCC

    how to calculate the heat (kJ) released to thesurroundings when a 23.0 g of HCL if formed, from a CH4 + Cl2=CHCl3+3HCL

    asked on December 13, 2012
  58. math

    A factory can produce two products, x and y, with a profit approximated by P = I think it's b but I'm not really sure. Can someone show me how to do this or let me check my answer? :) 14x + 22y – 900. The production of y can exceed x by no more than 200

    asked on September 17, 2012
  59. Probability

    We have a red coin, for which P(Heads)=0.4, a green coin, for which P(Heads)=0.5 and a yellow coin for which P(Heads)=0.6. The flips of the same or of different coins are independent. For each of the following situations, determine whether the random

    asked on November 24, 2018
  60. Chemistry

    A reaction : A(aq)+B(aq) --> C(aq) has a standard free-energy change of –4.01 kJ/mol at 25 °C. What are the concentrations of A, B, and C at equilibrium if, at the beginning of the reaction, their concentrations are 0.30 M, 0.40 M, and 0 M,

    asked on April 28, 2014
  61. French, foreign language

    Hi, I need help with answering some questions for French Here's my work on them tell me what you came up with for each question that is incorrect: 1.C'est un plat typiquement français. On les prépare avec du beurre et de l'ail. Ce sont un escargot

    asked on March 17, 2015
  62. math

    3.the total amount Jurene paid for 5 kilos of rice and 2 kilos of fish is less than php 600 a.what mathematical statement represents the total amount Jurene paid?Define the variables used. b.suppose a kilo of rice costs php 35.what could be the greatest

    asked on November 6, 2018
  63. Equations

    How many real number solutions does the equation have y=3x^2+18x+27 none one two infinite

    asked on April 2, 2014
  64. Physical Science

    Which of these cannot increase the strength of an electromagnet? a. making the loops smaller in the coil b. placing an iron bar in the coil c. winding more loops in the coil d. increasing the current in the coil

    asked on April 29, 2014
  65. Reading The Scarlet Ibis help

    The only character who believed in doodle throughout the story of the Scarlet Ibis was Daddy Mama Aunt Nicey The narrator Is it Aunt Nicey?

    asked on September 26, 2013
  66. Math

    The ratio of the amount of money Jason had to the amount of money Wilson had was 12:13. After Wilson spent $63, Jason had 3 times as much money as Wilson. a) How much money did Jason have? b) How much money do they have altogether?

    asked on November 3, 2017
  67. UCF

    What will be the change in enthalpy when 100.0 g of butane, C4H10, is burned in oxygen as shown in the thermochemical equation below? 2 C4H10(l) + 13 O2(g) → 8 CO2(g) + 10 H2O(g) ΔH = −5271 kJ −2636 kJ −4534 kJ −9087 kJ −1.817 × 104 kJ

    asked on April 2, 2014
  68. 4th grade math

    write 3 different improper fractions that equal 4 2/3

    asked on March 23, 2010
  69. Physics

    A plate falls vertically to the floor and breaks up into three pieces, which slide along the floor. Immediately after the impact, a 200g piece moves along the x-axis with a speed of 2.00m/s and a 235g piece moves along the the y axis with a speed of

    asked on November 12, 2014
  70. english

    Choose the correct sentence pattern for the sentence below. There is good reason to be thankful. E-V-S S-V-DO-OC S-LV-PA S-V-DO S-V-IO-DO S-V S-LV-PN Question pattern

    asked on January 23, 2015
  71. math probability

    Assume that Pr[E]=0.55,Pr[F]=0.55,Pr[G]=0.55,Pr[E∪F]=0.85,Pr[E∪G]=0.8, and Pr[F∪G]=0.75. Find: Pr[E' U F]; Pr[F' ∩ G]; and Pr[E ∩ G]

    asked on September 15, 2012
  72. social studies

    Japan 1 bulldozer 3 cars America 1 bulldozer 2 cars WORLD TOTAL 2 bulldozers 5 cars 8. What is the opportunity cost for America to make 1 bulldozer instead of cars? A) 1 car B) 2 cars C) 1/2 car 9. What is the opportunity cost for Japan to make 1 bulldozer

    asked on July 22, 2012
  73. calculus

    The differential equation below models the temperature of a 87°C cup of coffee in a 17°C room, where it is known that the coffee cools at a rate of 1°C per minute when its temperature is 67°C. Solve the differential equation to find an expression for

    asked on April 27, 2017
  74. algebra

    Sal's Sandwich Shop sells wraps and sandwiches as part of its lunch specials. The profit on every sandwich is $2 and the profit on every wrap is $3. Sal made a profit of $1,470 from lunch specials last month. The equation 2x + 3y = 1,470 represents Sal's

    asked on October 14, 2015
  75. Calculus

    How do I solve lim(x-->pi/4)(sinx-cosx)/cos(2x) The (x-->pi/4) goes below the lim. Should i just substitute the x's with pi/4??

    asked on February 21, 2009
  76. Science

    which of the following is an example of a cyclic behavior that is seasonal? a. running from predators b. searching for water c. hunting at night d. migrating for warmth** I think its d

    asked on January 13, 2016
  77. Chemistry

    Hi! I really really need help in this question: what observation is expected when: 1. an acid (nitric acid, HNO3) is added to a solution containing carbonate or bicarbonate ions? 2. silver ion is added to a solution containing chloride (or bromide or

    asked on September 9, 2015
  78. Economics

    Someone advocates using fiscal policy to stimulate the economy and reduce unemployment. Which of the following might this person advocate to implement the fiscal policy? A) increase federal spending B) reduce tax rates C) both A and B D) neither A nor B I

    asked on July 22, 2012
  79. Spanish

    Write the sentences Margarita would say to indicate that she has completed the errand specified in the prompt. Use the appropriate direct object pronouns (lo, los, la, las). Modelo sacar un libro de la biblioteca Lo saqué. echar una carta ????

    asked on October 23, 2015
  80. US Government

    people who believe voting is important have high political ...? what clue:(8-letter word) ----c-c-.

    asked on June 26, 2012
  81. Physics

    Carol drops a stone into a mineshaft 122.5m deep. Calculate the time from when she hears it hit the bottom of the shaft. Assume the speed of sound in the air 343 m/s.

    asked on July 8, 2013
  82. chemistry

    Calculate the weight (in mg) of borax Na2B4O7.10H20 required to react with 25.0 mL if 0.100 M HCI No. moles HCl consumed = __________ moles No. moles borax required = __________ moles Molar mass of borax = __________ g mol-1 (Na2B4O7.10H2O) Weight borax

    asked on April 22, 2013
  83. French, foreign languages

    Hi, I desperately need help with double object pronouns in French. Here are questions that I am working on and I can't make heads nor tails of them: L'agence de voyages a envoyé les billets d'avion à mes parents. Mes parents ont acheté de grandes

    asked on June 12, 2015
  84. Algebra

    Evan washes two types of vehicles. It takes him 30 minutes to wash a car and 40 minutes to wash a truck. He charges $12 to wash a car and $15 to wash a truck. In 270 minutes, Evan made $105 washing cars and trucks. How many trucks did Evan wash?

    asked on July 4, 2014
  85. Chemistry

    Strong base is dissolved in 675 ml of 0.200 m weak acid (ka=3.25x10^-5) to make a buffer with a ph of 3.95. Assume that the volume remains constant when the base is added. HA + OH ---> H2O + A^- calculate the pka value of the acid and determine the number

    asked on November 9, 2011
  86. math

    Eden finances a purchase of $611.03 by making monthly payments of $26.17 for 2 1/2 years. What annual interest rate, compounded monthly, is she being charged?

    asked on June 10, 2013
  87. French

    Did I do this correctly: 1. Malika / une pêche Malika a demande une peche, mais il lui a donne une poire. 2. Soraya / une tomate Soraya a demande une tomate, mais il lui a donne un oignon. 3. Daniel / du pâté Daniel a demande du pate, mais il lui a

    asked on February 24, 2015
  88. Physics

    The free-fall acceleration at the surface of planet 1 is 18 m/s^2. The radius and the mass of planet 2 are twice those of planet 1. What is the free-fall acceleration on planet 2?

    asked on April 21, 2012
  89. Vocab

    An exclusive control like in a business A. Bureaucracy B. Balance and Trade C. Monopoly D. Checks and Balances A???

    asked on November 12, 2015
  90. Physics

    Neutral metal sphere A, of mass 0.10kg, hangs from an insulating wire 2.0m long. An identical metal sphere B, with charge -q is brought into contact with sphere A. Sphere A goes 12 degrees away from Sphere B. Calculate the initial charge on Sphere B. Note:

    asked on May 3, 2008
  91. Physical Science

    The specific heat of copper is 0.385 J/g.°C. Which equation would you use to calculate the amount of heat needed to raise the temperature of 0.75 g of copper from 7°C to 29°C? a. Q = 0.385 J/g.°C ` (29°C 7°C) b. Q = 0.75 g ` 0.385 J/g.°C ` 29°C c.

    asked on May 13, 2014
  92. pals help

    An air-track cart with mass m1=0.29kg and initial speed v0=0.95m/s collides with and sticks to a second cart that is at rest initially. Part A If the mass of the second cart is m2=0.55kg, how much kinetic energy is lost as a result of the collision?

    asked on April 18, 2017
  93. Chemistry

    The burning of the magnesium becomes uncontrolled (it burn brightly. Oops! How will this procedural error affect the reported mole ratio of magnesium to oxygen in the analysis? Explain.

    asked on June 13, 2010
  94. US Government

    Why do we have more safeguards for accused criminals than the victims themselves?

    asked on July 18, 2012
  95. Chemistry

    if 5.00 ml of 1.66x10^-1 M HCl solution is diluted to exactly 250.0 ml with water, what is the concentration of the resulting solution?

    asked on November 16, 2014
  96. pre cal

    f(x) = two divided by quantity x squared minus two x minus three Graph A coordinate axis scaled by one. Domain and Range : _____________________ x and y Intercept(s) : _____________________ Horizontal Asymptote(s) : ___________________ Vertical

    asked on June 23, 2014
  97. ENG1010

    Which of the following is an announcement rather than a topic sentence? A) I want to talk about the increase in the divorce rate. B) Many people have trouble getting along with others. C) Almost one out of every two marriages ends in divorce. D) The

    asked on March 6, 2011
  98. physics

    An air-track cart with mass m=0.20kg and speed v0=1.5m/s approaches two other carts that are at rest and have masses 2m and 3m, as indicated in (Figure 1) . The carts have bumpers that make all the collisions elastic. Find the final speed of cart 1,

    asked on April 18, 2017
  99. Algebra

    Find k, given that (2,k) is equidistant from (3,7) and (9,1). The answer is : k=0 How do I solve this problem?

    asked on August 13, 2012
  100. 6th grade math

    a diver's elevation is -30 feet relative to sea level. she dives down 12 feet. what is her elevation after the dive? a. 12 feet b. 18 feet c. -30 feet d. -42 feet

    asked on October 15, 2014


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