Popular questions and responses by jason
  1. Chem

    Plese tell me if these are right. A 15.0-mL sample of NaCl solution has a mass of 15.78g. After the NaCl is evaporated to dryness, the dry salt residue has a mass of 3.26g. Calculate the following concentrations for the NaCl solution. a. %(m/m)= 3.26 x 100

    asked on November 7, 2010
  2. Algebra

    2. The table shows the heights in inches of trees after they have been planted. What is the height of a tree that is 64 in. Tall in its pot A. 42 in B. 52 in C. 60 in D. 76 in 3. Which ordered pair is a solution to y=8x A. 0,8 B. -1,8 C. 1.5,10 D. 2,16 4.

    asked on October 13, 2016
  3. Chemistry

    175g of water was heated fro 15 to 88 degrees C. how many kilocalories were absorbed by the water? I got 94.5 kcal. Is this right?

    asked on September 18, 2010
  4. Chemistry

    In aqueous solution, hypobromite ion, BrO-, reacts to produce bromate ion, BrO3 -, and bromide ion, Br-, according to the following chemical equation. 3BrO-(ag) → BrO3 -(ag)+2Br-(ag) A plot of 1/[BrO-] vs. time is linear and the slope is equal to 0.056

    asked on February 19, 2011
  5. Chemistry

    what is the total number of moles in 80.0 grams of C2H5Cl (gram-formula mass=64.5grams/mole)? (1)0.806 (2)1.24 (3)2.48 (4)5.16 i appreciate any help.

    asked on January 3, 2011
  6. Chemistry

    A 0.25g sample of a pretzel is burned. The heat it gives of is used to heat 50.g of water from 18 to 42 degrees C. what is the caloric value of the pretzel in kcal/g? Can someone walk me through step by step?

    asked on September 18, 2010
  7. Physics #2

    A car can decelerate at -3.40 m/s2 without skidding when coming to rest on a level road. What would be the magnitude of its deceleration if the road were inclined at 14° uphill? Assume the same static friction coefficient.

    asked on October 11, 2010
  8. physics

    The sun rotates around the center of the milky way galaxy at a distance of about 30,000 light years (1ly= 9.5*10^15m). if it takes about 200 million years to make one rotation, estimate the mass of our galaxy. Assume that the mass distribution of galaxy is

    asked on October 25, 2008
  9. physics

    A diver in midair has an angular velocity of 6.0 rad/s and a moment of inertia of 1.2 kg·m2. He then pulls is arms and legs into a tuck position and his angular velocity increases to 12 rad/s. The net external torque acting on the diver is zero. What is

    asked on November 1, 2011
  10. english 11

    1. In persuasive writing, it is important to (1 point)anticipate and address counterarguments. clearly state your position. provide facts and examples to back up your position. practice all of the above. 2. “Redskin” was originally a term for (1

    asked on March 9, 2012
  11. Physics

    When spiking a volleyball, a player changes the velocity of the ball from 4.5 m/s to -20 m/s along a certain direction. If the impulse delivered to the ball by the player is -9.7 kg * m/s, what is the mass of the volleyball?

    asked on March 29, 2011
  12. calculus

    26. A train is heading due west from St. Louis. At noon, a plane flying horizontally due north at a fixed altitude of 4 miles passes directly over the train. When the train has traveled another mile, it is going 80 mph, and the plane has traveled another 5

    asked on March 16, 2009
  13. Trigonometry

    Given \tan \theta = -\frac{4}{3}, where \frac{\pi}{2} < \theta < \pi, what is the value of \frac{1}{\sin \theta + \cos \theta}?

    asked on March 27, 2013
  14. Math

    the box and whisker plot show data for the test scores of four groups of students in the same class. which plot represents a group with a median grade below 65? (Posting plots in comments) I was thinking its A, but i'm not sure.

    asked on April 3, 2015
  15. Algebra

    An engineer designs a satellite dish with a parabolic cross section. The dish is 14 ft wide at the​ opening, and the focus is placed 4 ft from the vertex. ​a) Position a coordinate system with the origin at the vertex and the​ x-axis on the​

    asked on November 16, 2016
  16. history

    What impact did the Three-Fifths Compromise have on the passage of the Constitution at the Philadelphia Convention? Politicians believed a compromise would lead southerners to emancipate their slaves through eschewing representation in the House of

    asked on October 22, 2018
  17. english

    Could someone check my answers please?From "When Grees Meets Greek" 1) What can you conclude from the wording of the following text? "One morning Ramkilawansingh(after this, we calling this man Ram) was making a study of the noticeboards along Westbourne

    asked on January 9, 2012
  18. geometry

    A cylinder has a height of 16 cm and a radius of 5 cm. A cone has a height of 12 cm and a radius of 4 cm. If the cone is placed inside the cylinder as shown, what is the volume of the air space surrounding the cone inside the cylinder? (Use 3.14 as an

    asked on January 23, 2014
  19. chemistry

    the heat of vaporization for water is 540 cal/g. how many kilocalories are needed to change 22g of liquid water to steam at 100*c?

    asked on June 18, 2013
  20. chemistry-

    How do I construct an ICE table for this question. CH3COOH + NaOH --> CH3COONa + H2O Fill in the equilibrium line of the table. [Think about the initial pH and think about the pH at the end point of the titration. Initial pH 2.72 When the solution turned

    asked on May 9, 2007
  21. Physics

    The gravitational field strenght on the moon is 1.63N/kg. If a rock on the moon weights 2000N, how much does the same rock weigh on the earth?

    asked on October 21, 2012
  22. finance (efficiency of management)

    The best indication of the operational efficiency of management is? A. net income B. earnings per share C. EBIT D. gross profit I like net income as a metric for operational efficiency because net income is how much money the company has after to paid all

    asked on July 25, 2008
  23. Language Arts (ASAP)

    3. In "All Together Now," Jordan uses appeals to emotion and appeals to reason to try to persuade her readers that her views are important. In a paragraph, cite one example of each kind of appeal in her work. Then, explain whether you find Jordan's appeals

    asked on December 6, 2016
  24. chem

    why do we add boiling chips or boiling stones before the distillation starts? Boiling chips should never be added to a hot solution!Why? i don't know what the answer is to the first one, but as for the second i think i have a clue. is it that the boiling

    asked on November 2, 2008
  25. English

    What elements of the Restoration comedy are seen in The Importance of Being Earnest?

    asked on January 22, 2013
  26. chem

    The Rf value of compound A is .34 when the TLC plate is developed in hexane and .44 when the plate is developed in diethyl ether. Compound B has an Rf value of .42 in hexane and .60 in diethyl ether. Which solvent would be better for seperating a mixture

    asked on October 21, 2008

    How are presidential vetoes and congressional overrides related to partisan control of government?

    asked on February 4, 2018
  28. Algebra

    Hi! My name is Jason... today I have 2 problems for you both having to deal with Algebra. My questions are ::: Question 1 :: Direction: Find the degree of the polynomial. Problem: - 1 + 8 x ^ 4 - x ^ 2 (negative 1 plus 8x squared minus x squared) Question

    asked on August 20, 2007
  29. chemistry

    A 2.500×10−2M solution of NaCl in water is at 20.0∘C. The sample was created by dissolving a sample of NaCl in water and then bringing the volume up to 1.000 L. It was determined that the volume of water needed to do this was 999.3mL . The density of

    asked on May 24, 2015
  30. physics

    Two skaters, one with mass 62 kg and the other with mass 45 kg, stand on an ice rink holding a pole of length 10 m and negligible mass. Starting from the ends of the pole, the skaters pull themselves along the pole until they meet. How far does the 45 kg

    asked on November 1, 2011
  31. chemistry

    A 2.500×10−2M solution of NaCl in water is at 20.0∘C. The sample was created by dissolving a sample of NaCl in water and then bringing the volume up to 1.000 L. It was determined that the volume of water needed to do this was 999.3mL . The density of

    asked on May 24, 2015
  32. finance (please review my thought process and ans)

    4. A conservative financing plan involves A. ANSWER Heavy reliance on debt B. Heavy reliance on equity C. High degree of financial leverage D. High degree of combined leverage I chose (A) because financial leverage is the use of debt financing. 5. At age

    asked on July 25, 2008
  33. Chem

    A sample of 2-butanol has a specific rotation of 3.25. Determine the % ee and molecular composition of this sample. The sepcific rotation of pure (+)-2-butanol is +13.0. is it (3.25/13.0)x100%= 25%... i'm a little confused on the molecular composition

    asked on November 18, 2008
  34. Math-Statistics

    For a standard normal curve, find the z-score that separates the bottom 90% from the top 10%.

    asked on December 9, 2009
  35. chemistry

    Ammonium iodide dissociates reversibly to ammonia and hydrogen iodide: NH4I(s) ↔ NH3(g) + HI(g) At 400ºC, Kp = 0.215. If 150 g of ammonium iodide is placed into a 3.00-L vessel and heated to 400ºC, calculate the partial pressure of ammonia when

    asked on March 22, 2011
  36. chemistry

    Ammonium carbonate decomposes upon heating according to the following balanced equation: (NH4)2CO3(s)-->2 NH3(g)+CO2(g)+H2O(g) Calculate the total volume of gas produced at 25 C and 1.07atm by the complete decomposition of 11.86 g of ammonium carbonate.

    asked on April 16, 2010
  37. Physics 221

    An electron is accelerated by a uniform electric field (1000 V/m) pointing vertically upward. Use energy methods to get the magnitude and direction of its velocity after it moves 0.10 cm form rest. Does the electron gain or lose potential energy?

    asked on December 31, 2013
  38. Chemistry

    What is the geometry of S2O82- its basically two SO4 molecules connected by the O-O bond

    asked on November 4, 2008
  39. Physics

    Two students (90.0 kg and 60.0 kg) on roller skates face-to-face push against each other. The 90.0 kg student moves at 5.0 m/s just after their hands lose contact. I figured out part A (final velocity of 60.0 kg student) to be 7.5 m/s backward. I need help

    asked on December 24, 2014
  40. Chemistry

    Which of the following species is the strongest oxidizing agent under standard state conditions? a. Ag+(aq) b. H2(g) c. H+(aq) d. Cl2(g) e. Al3+(aq) I think Ag+(aq) will transfer electons sooner than the other four choices. BECAUSE: H2 will hold on it its

    asked on March 10, 2009
  41. Math

    Kevin has an equal number of quarters nickels and dimes in his piggy bank, he randomly picks a coin replaces it and picks another coin. What is the probability that the sum of the two coins picked is at least thirty cents

    asked on August 29, 2016
  42. physics (this one is killing me clear answer)

    At time t = 0 s, a puck is sliding on a horizontal table with a velocity 3.60 m/s, 35.0° above the +x axis. As the puck slides, a constant acceleration acts on it that has the following components: ax = –0.360 m/s2 and ay = –0.980 m/s2. What is the

    asked on February 4, 2014
  43. chem

    what precautions should be observed when an aqueous sodium carbonate solution is used to extract an organic solution containing traces of acid? is it that aqueous sodium carbonate is extremely combustible, which can't be exposed to an open flame?

    asked on October 28, 2008
  44. Mechanics

    Typically, a tennis ball hit during a serve travels away at about 51 m/s. If the ball is at rest mid-air when struck, and it has a mass of 0.058 kg, what is the change in its momentum on leaving the racket? Show the solution and answer.

    asked on September 19, 2013
  45. Algebra

    4 years ago my father's age was 4 times that of my age. At present the sum of my father's age and that of mine is 53 years . What is father's present age.

    asked on October 5, 2014
  46. chem

    a crude non acidic product mixture dissolved in diethyl ether contains acetic acid. describe an extraction procedure that could be used to remove the acetic acid.

    asked on October 28, 2008
  47. chemistry

    How much heat would be released by the condensation of 5.40 g of steam at 100 °C and the subsequent cooling of the water to 25 °C? [ÄHvap = 40.7 kJ/mol at 100 °C; Cp for H2O(l) is 4.18 J g-1 °C-1]

    asked on January 24, 2008
  48. physics

    What is the intensity in watts per meter squared of 85.0 db sound?

    asked on November 27, 2012
  49. physics

    Radio waves transmitted through space at 3.00¡¿10 8 m/s by the Voyager spacecraft have a wavelength of 0.120 m. What is their frequency?

    asked on November 13, 2012
  50. math

    A rectangular school yard 280 m by 245 m is to be fenced. How many metres of fencing will be required to fence it completely?

    asked on July 5, 2012
  51. Chemistry

    Can you tell me if these are right please? When 2.50g of copper reacts with oxygen the copper oxide product has a mass of 2.81g. What is the simplest formula of the copper oxide. I got Cu2O (copper (I) oxide). Aluminum and oxygen gas react to produce

    asked on October 19, 2010
  52. Physics

    Comic-strip hero Superman meets an asteroid in outer space, and hurls it at 750 m/s, as fast as a bullet. The asteroid is three thousand times more massive than Superman. In the strip, Superman is seen at rest after the throw. Taking physics into account,

    asked on February 15, 2012
  53. math

    marissa pours 1 1/2 cups of punch in each glass how many fluid ounces is each serving?

    asked on April 22, 2014
  54. physics (clear answer)

    Two children hang by their hands from the same tree branch. The branch is straight, and grows out from the tree trunk at an angle of 26.1° above the horizontal. One child, with a mass of 43.6 kg, is hanging 1.31 m along the branch from the tree trunk. The

    asked on April 3, 2014
  55. chemistry

    In the following half equation, which is the oxidizing agent? NO3–(aq) + 4H+(aq) + 3e– NO(g) + 2H2O a. NO3– b. H+ c. e– d. NO e. H2O An oxidizing agent is a chemical compound that readily transfers oxygen atoms, or is a substance that gains

    asked on March 10, 2009
  56. Physics

    Two identical speakers, labeled Speaker 1 and Speaker 2, are playing a tone with a frequency of 175 Hz in phase. The centers of the speakers are located 6.00 m apart. Five observers are standing on a line that is 6.00 m in front of the speakers, as shown

    asked on November 2, 2019
  57. chemistry

    Use the reaction shown to calculate the mass of iron that must be used to obtain 0.500 L of hydrogen at STP: 3Fe(s) + 4H2O(l) pr029-1.jpg Fe3O4(s) + 4H2(g

    asked on January 13, 2013
  58. Math

    Clark's Country Pet Resort is fencing a new play area for dogs. The manager has purchased 186 yd of fence to enclose a rectangular pen. The area of the pen must be 2156 yds^2. What are the dimensions of the​ pen? Length is how many yards? Width is how

    asked on November 15, 2016
  59. chem

    why does the addition of a salt (like sodium chloride) to the aqueous layer sometimes help break up an emulsion that forms in an extraction? - sorry about that last post

    asked on October 21, 2008
  60. AP Chemistry

    A 5 gram sample of a gaseous substance occupies 10 L at 48◦C and 697 torr. What is the density of the gas under these conditions? Answer in units of g/L I first started converting the temperature to Kelvin, and the pressure to ATM. I then re-arranged the

    asked on November 13, 2017
  61. Math pls help me pls pls

    If the outliers are not included, what is the mean of the data set? 72, 82, 3, 55, 62, 73, 90, 80, 151, 59, 46, 31 59 65 67 73 is it b

    asked on February 10, 2016
  62. finance firm's sales on credit

    In general, the larger the portion of a firm's sales that are on credit, the: A. lower will be the firm's need to borrow B. higher will be the firm's need to borrow C. more rapidly credit sales will be paid off D. more the firm can buy raw materials on

    asked on July 25, 2008
  63. Physics

    The femur of a human leg (mass 10 kg, length 0.9 m) is in traction, as shown in the figure below. The center of gravity of the leg is one-third of the distance from the pelvis to the bottom of the foot. Two objects, with masses m1 and m2, are hung using

    asked on July 15, 2013
  64. chem

    What would be the effect of raising the temperature and increasing the carrier gas flow rate on the ability to resolve two closely spaced peaks in gas chromatography? -I was thinking that the width or the maximum peak of each curve will change since the

    asked on January 16, 2009
  65. finance (risk premium)

    The risk premium is likely to be highest for A. U.S. government bonds B. corporate bonds C. gold mining expedition D. either B or C I like C the gold mining expedition I that correct??

    asked on July 25, 2008
  66. physics (clear answer)

    An airplane traveling north at 400 m/s is accelerated due east at a rate of 50 m/s2 for 6 s. If the effects of air resistance and gravity are ignored, what is the final speed of the plane?

    asked on February 5, 2014
  67. chemistry

    what experimental difficulty would you encounter if you had neglected to include a drying step before evaporating the ether solution of the neutral organic compound? Water was added to the organic solvent ,but a drying agent wasn't added. So would the

    asked on November 9, 2008
  68. calculus

    The table below gives selected values for the function f(x). Use a trapezoidal estimation, with 6 trapezoids to approximate the value of . x 1 1.1 1.2 1.5 1.7 1.9 2.0 f(x) 1 3 4 6 7 8 10

    asked on February 9, 2016
  69. physics

    Wind gusts create ripples on the ocean that have a wavelength of 5.00 cm and propagate at 2.00 m/s. What is their frequency?

    asked on November 13, 2012
  70. Chemistry

    An electron in the n = 10 state of a hydrogen atom emits a photon with energy of 6.54×10–20 J. What is the final state of the electron

    asked on November 19, 2016
  71. finance (assumptions)

    The cost of capital for common stock is ke=(D1/Po)+g. What are the assumptions of the model? A. growth (g) is constant to infinity B. the price earnings ration stays the same C. the firm must pay a dividend to use this model D. all of the above are

    asked on July 26, 2008
  72. physics

    A jellyfish can propel itself with jets of water pushed out of its bell, a flexible structure on top of its body. The elastic bell and the water it contains function as a mass-spring system, greatly increasing efficiency. Normally, the jellyfish emits one

    asked on November 29, 2014
  73. physics

    The pendulum on a cuckoo clock is 5.00 cm long. (a) Determine the period of this pendulum. (b) What is its frequency?

    asked on November 20, 2012
  74. math-test statistic

    If we have a sample of 12 drawn from a normal population, then we would use as our test statistic A) z0 with 11 degrees of freedom B) t0 with 12 degrees of freedom C) z0 with 12 degrees of freedom D) t0 with 11 degrees of freedom

    asked on December 5, 2009
  75. physics

    You are trying to find out how high you have to pitch a water balloon in order for it to burst when it hits the ground. You discover that the balloon bursts when you have pitched it to a height of 17 m. With what velocity did the balloon hit the ground?

    asked on November 19, 2014
  76. math

    If $60 is put in an account that gets 7% per year, and I add $15 at the end of each year, how much will I have at the end of 8 years?

    asked on February 7, 2016
  77. science

    A jellyfish can propel itself with jets of water pushed out of its bell, a flexible structure on top of its body. The elastic bell and the water it contains function as a mass-spring system, greatly increasing efficiency. Normally, the jellyfish emits one

    asked on November 30, 2014
  78. physics

    Approaching a flashing pedestrian activated traffic light, a driver must slow down to a speed of 30km/h. If the cross walk is 150m away and the vehicle's initial speed us 59km/h, what must be the magnitude of the car's acceleration to reach the speed

    asked on July 3, 2013
  79. Math, Probability

    According to a survey of Australian households, the probability that annual household income is over $50,000 if the residents own 2 cars is 80%. Of the households surveyed, 60% had incomes over $50,000 and 70% had 2 cars. The probability that annual

    asked on September 14, 2018
  80. physics

    the angular speed of the hour hand of a clock is

    asked on December 1, 2016
  81. calculus

    An auditorium with a flat floor has a large screen on one wall. The lower edge of the screen is 3 feet above eye level and the upper edge is 10 feet above eye level. Assume you walk away fron the screen at a rate of 3 ft/s while looking at the screen. What

    asked on November 13, 2012

    Why is baseball in all its forms – from T-ball to the major leagues – important to Americans of all ages? What traditions have grown around baseball, and how do they affect the people who play and love the game? How can knowing about the game of

    asked on October 18, 2015
  83. Chemistry

    A solution made up of 1.00 M NH3 and 0.500 M (NH4)2SO4 has a pH of 9.26. a. Write the net ionic equation that represents the reaction of this solution with a strong acid. b. Write the net ionic equation that represents the reaction of this solution with a

    asked on August 3, 2014
  84. finance

    1. The belief that investors require a higher return to entice them into holding long-term securities is the viewpoint of the A. the expectations hypothesis B. segmentation theory C. the liguidity premium theory D. market credit crunch theory 2. The market

    asked on July 23, 2008
  85. Mechanics

    a driver of a 1200-kg car notices that the car slows from 20 m/s to 15 m/s as it coasts a distance of 130 m along level ground. How large a force opposes the motion? Show the solution

    asked on September 14, 2013
  86. physics

    A hot air balloon is traveling vertically upward at a constant speed of 2.7 m/s. When it is 11 m above the ground, a package is released from the balloon. After it is released, for how long is the package in the air? The acceleration of gravity is 9.8 m/s

    asked on November 27, 2014
  87. chem

    Hydrogen iodide can decompose into hydrogen and iodine gases. 2HI(g) mc026-1.jpg H2(g) + I2(g) K for the reaction is 0.016. If 0.148 atm of HI(g) is sealed in a flask, what is the pressure of each gas when equilibrium is established?

    asked on March 5, 2014
  88. finance (bonds to stock)

    corporations prefer bonds to preferred stock for financing their operations because? A. prefered stocks require a dividend B. bond interest rates change with the economy while stock dividends remain constant C. the after-tax cost of debt is less than the

    asked on July 25, 2008
  89. chem

    A student carried out a simple distillastion on a compound known to boil at 124 C and reported an observed boiling point of 116-117 C. Gas chromatographic analysis of the product showed that the compound was pure, and a calibration of the thermometer

    asked on November 3, 2008
  90. Chemistry

    What is the molar solubility of PbCl2 in a solution of 0.23 M CaCl2? Ksp = 1.6 10-5 for PbCl2. idk how to do this because of the Cl2

    asked on May 11, 2009
  91. Finance

    Universal Laser, Inc., just paid a dividend of $3.30 on its stock. The growth rate in dividends is expected to be a constant 6 percent per year, indefinitely. Investors require a return of 15 percent on the stock for the first three years, a rate of return

    asked on March 28, 2016
  92. physics

    The barrel of a rifle has a length of 0.976 m. A bullet leaves the muzzle of a rifle with a speed of 561 m/s. What is the acceleration of the bullet while in the barrel? A bullet in a rifle barrel does not have constant acceleration, but constant

    asked on November 19, 2014
  93. chem

    K2CO3 is an excellent drying agent for some classes of organic compounds. would it be a better choice for an acid (RCO2H)or an amine(RNH2)? why? i know this is RNH2. could it be explained that potassium carbonate itself is basic so it will make water and a

    asked on October 28, 2008
  94. Interediate algebra

    if f varies jointly as q^2 and h, and if f = 72 when q = 3 and h = 4, find h when f = 48 and q = 2

    asked on April 7, 2012
  95. Physics

    An iron bolt of mass 70.0 g hangs from a string 31.3 cm long. The top end of the string is fixed. Without touching it, a magnet attracts the bolt so that it remains stationary, displaced horizontally 23.0 cm to the right from the previously vertical line

    asked on January 18, 2010
  96. Geography

    Would appreciate the help and input. Thanks 1. What is the effect of Washington’s location on the Pacific Rim? (1 point) a.International relations are difficult to develop and maintain.* b.The culture in Washington is more influenced by the Far East

    asked on February 15, 2019
  97. finance (total asset turnover)

    Total asset turnover indicates the firm's? A. liquidity B. debt position C. ability to use its assets to generate sales D. profitability I read about a asset turnover ratio in the text book. this ratio by itself is useless but when compared to the company

    asked on July 26, 2008
  98. physics

    An attack helicopter is equipped with a 20- mm cannon that fires 105 g shells in the forward direction with a muzzle speed of 669 m/s. The fully loaded helicopter has a mass of 4260 kg. A burst of 133 shells is fired in a 5.41s interval. What is the

    asked on December 10, 2012
  99. Chemistry

    3.13g if CuNO3 is dissolved in water to make a 0.270 M solution. What is the volume of the solution?

    asked on November 22, 2010
  100. Math

    Each day Julia's math Teacher gives class a warm up qs. It's true/false 20% of the times and multiple choice 80% . Julia gets 70% on true false correct and 90% on multiple choice correct. Julia answered today's question correctly. What's the probability

    asked on April 15, 2015


  1. 1
  2. 2
  3. 3
  4. 4
  5. 5
  6. 6
  7. 7
  8. 8
  9. 9
  10. 10
  11. 11