Most popular questions and responses by Paula
  1. Lincoln College Of New En

    it has been found that 85.6% of all enrolled college and university students in the U.S. are undergraduates. A random sample of 500 enrolled college students in a particular state revealed that 420 of them were undergraduates. Is there sufficient evidence

    asked on April 26, 2013
  2. Algebra

    What inequality represents the verbal expression all real numbers less then 69? My answer is x

    asked on September 14, 2014
  3. Chemistry

    Phosphoric acid, H3PO4(aq), is a triprotic acid, meaning that one molecule of the acid has three acidic protons. Estimate the pH, and the concentrations of all species in a 0.300 M phosphoric acid solution. kPa1: 2.16 kPa2: 7.21 kPa3:12.32 [H3PO4] = ?

    asked on March 10, 2013
  4. Chemistry

    Phosphoric acid, H3PO4(aq), is a triprotic acid, meaning that one molecule of the acid has three acidic protons. Estimate the pH, and the concentrations of all species in a 0.300 M phosphoric acid solution. pKa1: 2.16 pKa2: 7.21 pKa3: 12.32 Hint: Convert

    asked on March 9, 2013
  5. science

    why does a cool, distant, supergiant star such as Betelgeuse have such a high apparent magnitude? PLEASE HELPPPPP!!!!!!

    asked on March 21, 2012
  6. physics

    Scientists want to place a 3300 kg satellite in orbit around Mars. They plan to have the satellite orbit a distance equal to 2.2 times the radius of Mars above the surface of the planet. Here is some information that will help solve this problem: mmars =

    asked on September 13, 2014
  7. chemistry

    What is the total change in entropy when 10.0 g of ice melts at 25.0°C? DHfus = 6.01 kJ/mol The answer is 1.03 J/K but idk how to find it.

    asked on March 29, 2015
  8. Algebra

    Sis the set of prime numbers that are less than 15. My answer is 2,3,5,7,11, and 13

    asked on September 16, 2014
  9. chemistry help

    What mass of ammonium chloride must be added to a 0.500 L solution of 0.250 M ammonia to make a buffer with a pH of 9.26? Kb (NH3) = 1.8 × 10–5?

    asked on March 30, 2015
  10. Com 425

    Which of the following statements is an example of metacommunication? 1) "Lets introduce ourselves one at a time." 2) Don't call me names!" 3) I think we should take this vote to the Board." 4) Let's agree to not discuss old issues today."

    asked on July 17, 2016
  11. chemistry

    If a solution of lead iodide has [I-] = 1.1x10-4 M, what is the lead(II)ion concentration at equilibrium?

    asked on March 16, 2015
  12. statistics

    a pizza shop owner wishes to find the 95% confidence interval of the true mean cost of a large plain pizza. how large should the sample be if she wishes to be accurate to within $0.15? a previous study showed that the standard deviation of the price was

    asked on March 17, 2013
  13. Algebra

    Choose them compound inequality that represents all real numbers that are less then -3 or greater than or equal to 5.

    asked on September 17, 2014
  14. science

    If Deneb and Rigel were located at alpha Centauri's distance from earth, how would they appear? PLEASEEE HELPPPPPP!!!!!!!!!!

    asked on March 21, 2012

    the percentage rates of home ownership for 8 randomly selected states are listed below. Estimate the population variance and standard deviation for the percentage rate of home ownership with 99% confidence. 66.0 75.8 70.9 73.9 63.4 68.5 73.3 65.9

    asked on April 19, 2013
  16. Lincoln College Of New En

    the Old Farmer’s Almanac stated that the average consumption of water per person per day was 123 gallons. To test the hypothesis that this figure may no longer be true, a researcher randomly selected 16 people and found that they used on average 119

    asked on April 26, 2013
  17. chemistry help

    If the standard calcium carbonate solution is 100 ppm and 25 mL of solution is used for the standardization, calculate the approximate volume of 2mM EDTA solution needed to reach the end point of the titration. I know to use M1V1=M2V2 but need help

    asked on March 23, 2015
  18. Calculus

    A rocket is fired vertically into the air at the rate of 6 miles/min. An observer on the ground is located 4 miles from the launching pad. When the rocket is 3 miles high, how fast is the angle of elevation between the rocket and the observer changing?

    asked on November 2, 2014
  19. Lincoln College Of New En

    the average 1-ounce chocolate chip cookie contains 110 calories. A random sample of 15 different brands of 1-ounce chocolate chip cookies results in the following calorie amounts, at the a = 0.01 level, is there sufficient evidence that the average

    asked on April 26, 2013
  20. chemistry

    What is the total change in entropy when 10.0 g of ice melts at 25.0°C? DHfus = 6.01 kJ/mol The answer is 1.03 J/K but idk how to find it.

    asked on March 28, 2015

    A random sample of stock prices per share (in dollars) is shown. Find the 90% confidence interval for the variance and standard deviation for the prices. Assume the variable is normally distributed.

    asked on April 19, 2013
  22. chemistry

    Hydroxyapatite is the main mineral component of bone. How many grams of hydroxyapatite will dissolve in 1.00 L of H2O? Ksp = 2.34 × 10–59; Molar mass = 502.3 g/mol? I keep getting 5.83x10^-18 g but the answer is supposed to be 4.35x10^-5 g. I don't

    asked on March 29, 2015
  23. Chemistry

    In a 1.0× 10–4 M solution of HClO(aq), identify the relative molar amounts of these species. (most to least) H2O HClO H3O OH- OCl-

    asked on March 9, 2013
  24. physics

    A single mass (m1 = 3.1 kg) hangs from a spring in a motionless elevator. The spring constant is k = 338 N/m. 1. What is the distance the spring is stretched from its unstretched length? 2. Now, three masses (m1 = 3.1 kg, m2 = 9.3 kg and m3 = 6.2) hang

    asked on October 13, 2018
  25. chemistry

    Calculate the pH of a buffer which contains 0.0500 M pyruvic acid and 0.0450 M sodium pyruvate. (The Ka of pyruvic acid is 4.1 × 10–3)

    asked on March 27, 2015

    the percentage rates of home ownership for 8 randomdomly selected states are listed below. Estimate the population variance and standard deviation for the percentage rate of home ownership with 99% confidence. 66.0 75.8 70.9 73.9 63.4 68.5 73.3 65.9

    asked on April 17, 2013
  27. Earth Science

    A contour (topographic) map indicates that a stream is flowing across a landscape. If the stream has a constant volume, where on the map would the stream most likely have the highest velocity? a. As the stream moves across several closely spaced contour

    asked on September 29, 2013
  28. chemistry

    What mass of ammonium chloride must be added to a 0.500 L solution of 0.250 M ammonia to make a buffer with a pH of 9.26? Kb (NH3) = 1.8 × 10–5?

    asked on March 28, 2015
  29. Lincoln College Of New En

    A survey by Men’s Health magazine stated that 14% of men said they used exercise to reduce stress. Use a = 0.10. a random sample of 100 men was selected and 10 said that they used exercise to relieve stress. Use the P –value method to test the claim.

    asked on April 26, 2013
  30. Physics 212

    Three equal point charges, each with charge 1.50\mu C , are placed at the vertices of an equilateral triangle whose sides are of length 0.300m . What is the electric potential energy U of the system? (Take as zero the potential energy of the three charges

    asked on February 14, 2013
  31. algebra

    A rock is thrown upward with a velocity of 15 meters per second from the top of a 26 meter high cliff ad i misses the cliff on the way back down. when will the rock be 5 meters from the water below?

    asked on February 15, 2013
  32. Math

    The first question is show how to make one addend the next tens numbers. Complete the new addition sentence: 15 + 37= I need a break down to how to to figure this out. Please.. I have no clue what to do.

    asked on October 24, 2016
  33. chemistry

    Suppose that the reaction of Fe3+ and SCN- produces Fe(SCN)2 (+). 5.00mL of 2.0mM Fe3+ is mixed with 5.00 mL of 2.0mM SCN-. The student finds the equilibrium concentrations of Fe(SCN)2(+) to be 0.3mM. 1.) What is the initial number of moles of each species

    asked on February 23, 2015
  34. chem

    Calculate the mass in grams of carbon needed to produce 160 g of CO2 in burning: C + O2 --> CO2

    asked on July 15, 2013
  35. math word problem

    There are 10 women and 8 men in a club. How many different committees of 6 people can be selected from the group if equal numbers of men and women are to be on the committee? I think it would be 2, because half of 6 is 3, so 3 are men and 3 are women. 2

    asked on March 21, 2010
  36. COM425

    Abdoulaye tells his teammate Rick that he prefers to be called “Abdoulaye”; yet Rick continues to call him “Abdou.” This is a violation of __________ rules. 1) communication 2) relational 3) interpersonal 4) corporate (I think its relational, not

    asked on July 17, 2016
  37. 3D Modling

    What are the preset views in Blender Software?

    asked on August 31, 2014
  38. sociology

    How do the themes about male roles appear in the television and movies that we watch? What messages do these themes provide for men and women about masculinity and femininity?

    asked on July 27, 2009
  39. chem

    what is the molality of a solution of 50.0 grams of propanol in 152 mL water if the density of wate is 1.0 g/mL and the density of the solution is 0.78 g/mL

    asked on February 12, 2011
  40. algebra 1

    princess leia is a very good math student. Her average math grade was a 95 on her 15 tests. If Darth Mangham decides to drop her lowest grade, write an expression to determine her new test average.

    asked on October 3, 2014
  41. Lincoln College Of New En

    The percentage of physicians who are women is 27.9% in a survey of physicians employed by a large university health system, 45 of 120 randomly selected physicians were women. Is there sufficient evidence at the 0.05 level of significance to conclude that

    asked on April 26, 2013
  42. Chemistry

    Name the following compounds by IUPAC system : 1. [ Cr (NH3)3 Cl3] 2. Na4[Fe (CN)6 ] 3. Fe4[Fe (CN)6]3 4. [Ag(NH3)2] OH 5. [Cr(NH2-Ch2-ch2-NH2)3]cl3

    asked on March 10, 2010
  43. chem

    I am still having a little problem with my original question. However, this is what I have done so far. I am not sure what to do with the density of the solution of 0.78 g/mL. The answer I came up with is 5.47 mol/kg. I found the density of the water in

    asked on February 13, 2011
  44. Chemistry

    CO(g) + 2H_2(g) CH_3OH (g) deltaH=-90.7kJ Methanol is prepared industrially from synthesis gas (CO and H_2) Would the fraction of methanol obtained at equilibrium be increased by raising the temperature? Explain. Thank you :)

    asked on March 1, 2018
  45. science

    what would be the absolute magnitude and color of a main sequence star with a temperature of 25,000 kelvin? HELP!

    asked on March 21, 2012
  46. math

    The figure shown the chain drive of a bicycle. How far will the bicycle move if the pedals are rotated at 180°. Assume the radius of the bicycle wheel is 13.6 inches. There's a small circle w/a radius of 1.38 in and a large circle w/ 4.33 in.

    asked on November 17, 2010
  47. chemistry help

    What are the differences in measuring the molar mass using freezing point depression between studying ionic solids and molecular solids?

    asked on January 24, 2015
  48. Chemistry

    Calculate Delta H for the following equation: Zn(s) + 2H+(aq) = Zn2+(aq) + H2(g)

    asked on November 28, 2014
  49. Lincoln College Of New En

    26 Gasoline Mileage for Autos and Trucks – Of the top 10 cars and trucks based on gas mileage, 4 are Hondas, 3 are Toyotas, and 3 are Volkswagens. Choose one at random. Find the probability that it is Japanese, Japanses or German or not foreigh.

    asked on April 6, 2013
  50. chemistry

    a 23.8 g sample of unknown metal heated at 100 degrees c is placed in 50.0 mL of water at 24 degrees c resulting in 8.5 c temperature increase. What is the specific heat of the metal

    asked on March 12, 2013
  51. Living Environment

    How one type of atom (carbon)can be the basis of so many types of biomolecules?

    asked on October 8, 2012
  52. math

    In triangle ABC, sin A = 0.7 and sin B = 0.3 and side a = 12. What is the value of side b?

    asked on March 22, 2010
  53. Nutrition

    which of the foods is Not a common allergen? eggs, orange juice, rice, or whole wheat bread Rice is not a common allergen. Am I right? It is in some parts of Asia. But the others are more common here. So I would GUESS Rice is the correct answer. I would

    asked on April 20, 2007
  54. Chemistry

    What are the moles of substances present at equilibrium at 450C if 1 mol N2 and 4 mol H2 in a 10 L vessel react according to the following equation? N2 (g) + 3H_2(g) ⇌ 2NH_3 (g) The equilibrium constant Kc is 0.153 at 450C. Thanks a lot.

    asked on March 1, 2018
  55. Physics

    02. Comic-strip hero Superman meets an asteroid in outer space and hurls it at 800 m/s, as fast as a bullet. The asteroid is a thousand times more massive than Superman, yet in the comic strip, he remains stationary after releasing the asteroid. Say, his

    asked on August 25, 2014
  56. Math

    if 5x + 7y = 18 and 2x - 4y = 6, what is the value of 7x + 3y? a. 7 b. 12 c. 19 d. 24 e. 31

    asked on October 5, 2013
  57. Social studies

    how was the metis'list of rights different from the charter rights and freedom?

    asked on February 8, 2013
  58. chemistry

    What happens when : (give balanced chemical equations only) 1. Caustic soda reacts with carbon dioxide 2.caustic soda reacts with zinc hydroxide 3.potassium reacts with oxygen 4.sodium carbonate is fused with silicon dioxide 5. when bleaching powder reacts

    asked on March 10, 2010
  59. math

    Heidi has a brown pair and a gray pair of slacks; a brown blouse, a yellow blouse, and a white blouse: and a blue sweater and a white sweater. How many different outfits does she have if each outfitshe wears consists of slack, a bluse, and a sweater?

    asked on August 8, 2009
  60. Food and Nutrition

    How can food spices be either an obstacle or an aid to blending into a new culutre? If you prefer to eat highly spiced or seasoned foods, you might not want to eat the foods that are popular in your new culture. I knew a Vietnamese man who lived in the

    asked on March 29, 2007
  61. Chemistry

    I have one more question DrBob, I have draw a structure of this polymer CH2=CH-CH-OH ' CH3 and identify the monomer units. Would the mononer unit be this: CH2-CH-CH-O ' CH3 AND WOULD THIS POLYMERIZATION BE A CONDENSATION TYPE? Paula--I am not an organic

    asked on February 20, 2007
  62. chemistry

    A sample of 10.00g of a solid unknown was dissolved in 25.00g of water. Assuming that pure water freezes at 0.0°C and the solution freezes at -5.58°C, what is the molal concentration of the solution? What is the molar mass of the solid? Show your

    asked on January 24, 2015
  63. Chemistry

    A sample of oxygen gas occupies a volume of 3.84 L at 269. K. What volume will the sample occupy at 486. K?

    asked on December 6, 2014
  64. Chemistry

    What mass of ammonium nitrate is require to produce 145L of N2O at 2850 torr and 42 degree celcius

    asked on September 28, 2014
  65. Music

    if you add up the durations from left to right on any level of a note tree you end up with a what?

    asked on September 11, 2014
  66. Lincoln College Of New En

    How man 4 letter code words can be made using the letters in the word pencil if repetitions are permitted?

    asked on April 4, 2013
  67. statistics

    A mini-computer system contains two components, A and B. The system will function so long as either A or B functions. The probability that A functions is 0.95, the probability that B functions is 0.90, and the probability that both function is 0.88. What

    asked on March 5, 2011
  68. personal finance

    education plays a crutical role in financial success

    asked on February 2, 2011
  69. math

    julie arrived 20 minutes before the race began. she started right on time. it took her 24 minutes to finish the6-kilometer race. she stayed 10 minutes after the race to cool off; she left. if she arrived at the race at 9:10a.m., what time was it when she

    asked on March 31, 2010
  70. College chemistry

    103.5 mL of hydrogen are collected over water at 22.2 degrees Celsius and 758.2 torr from reaction with 0.1356 grams of alloy. calculate the number of moles of dry hydrogen gas that were collected.

    asked on March 30, 2010
  71. math word problem

    Jim is making a diagram of the solar system. If he draws Neptune, which is 2795 million miles from the sun, 10 inches from the sun on his paper, how far away (to the nearest tenth of an inch) from the sun should he draw Mars, which is 142 million miles

    asked on March 21, 2010
  72. Math

    Belinda borrowed $20,500 at simple interest rate of 4.30% p.a. from her parents to start a business. At the end of 3 months, she paid them $7,100 and $6,900 at the end of 8 months. How much would she have to pay them at the end of 18 months to clear the

    asked on September 18, 2016
  73. math

    Write ( 1 9 ) 3 as a product of the same factor. Then find the value

    asked on January 15, 2016
  74. finance

    A quaint but well established cafe shoppe in the new hot cafe wants to build a new cafe for increased capicity it expect sales are $800,000.00 for the first 5 years, direct cost including labor and material 50% for new cafe will be totaled at $750,000.00

    asked on August 17, 2014
  75. math 9th grade

    the perimeter of a rectangle is 56 inches> the width of the rectangle is three-fourth of the length. Find the length of the diagonal of the rectangle. please help me!!!

    asked on October 9, 2011
  76. english

    Lori and her friends went to a movie on the Fourth of July. identify the collective and compound nouns friends collective Fourth of July compound did i miss any? ty

    asked on June 16, 2011
  77. english

    Our class had a test in Spanish this afternoon. find the nouns mark concrete or abstract class concrete test concrete spanish concrete afternoon concrete?

    asked on June 16, 2011
  78. medical terminology

    what are five memory aids for the musculoskeletal system

    asked on June 26, 2010
  79. Chemistry

    In a certain reaction, 300.23 grams of solid aluminum sulfide combine with unlimited aqueous silver nitrate. How many moles of aluminum sulfide react? How many moles of each product will be produced? First of all, is the reaction a double replacement or

    asked on December 7, 2009
  80. Equivalent Payments

    Belinda borrowed $20,500 at simple interest rate of 4.30% p.a. from her parents to start a business. At the end of 3 months, she paid them $7,100 and $6,900 at the end of 8 months. How much would she have to pay them at the end of 18 months to clear the

    asked on September 18, 2016
  81. Physics

    A steel ball of mass 8.0 kg and traveling at 3.0 m/s [E] has a head-on elastic collision with a brass ball which is at rest. After the collision, the velocity of the brass ball is 4.0 m/s [E]. Find: a)the velocity of the steel ball after the collision b)

    asked on January 13, 2016
  82. finance

    Given an interest rate of 7.2 percent per year, what is the value at Year 9 of a perpetual stream of $3,950 payments that begin at Year 19

    asked on October 18, 2015
  83. Math

    In above triangular prism,ab=3cm,ac=4cm,bc=5cm and cd12 cm,show that triangle ABC is a right-angled triangle

    asked on September 6, 2014
  84. Physics

    David, who is 65 kg, is driving his car at a speed of 25 m/s. He sees a dog crossing the road and so he steps on the brake to avoid hitting it. His seatbelt brings his body to a stop in 0.4 s. What magnitude of force does the seatbelt exert on him?

    asked on August 25, 2014
  85. math

    130 square root to the nearest hundredth.

    asked on February 24, 2014
  86. chemistry

    When 30.0g of aluminum reacts with HCl, how many grams of aluminum chloride are formed? Al + HCl --> AlCl3 + H2

    asked on July 15, 2013
  87. science

    water in gas form is called

    asked on January 8, 2013
  88. Physics 111-1

    A wheel, starting from rest, has a constant angular acceleration of 1.8 rad/s2. In a 3.7-s interval, it turns through an angle of 52 rad. How long has the wheel been in motion at the start of this 3.7-s interval?

    asked on November 18, 2012
  89. Material Physics

    Gaseous nitrogen has a density of 1.17 kg/m3 and liquid nitrogen has a density of 810 kg/m3. [The relative molecular mass of nitrogen is 28.0] What is the mean volume per nitrogen molecule in each case? What is the mean separation between nitrogen

    asked on May 24, 2011
  90. Algebra

    A riverboat cruise line has a boat that can travel 76 mi downstream in the same time that it takes to travel 52 mi upstream. The speed of the current in the river is 1.5 mph. Find the speed of the boat in still water.

    asked on March 7, 2011
  91. math

    It is known from experience that in a certain industry 40 percent of all labour-management disputes are over wages, 40 percent are over working conditions, and 20 percent are over fringe benefit. Also, 9 percent of the disputes over wages are resolved

    asked on March 5, 2011
  92. math

    Take any number (except for 1). Square that number and then subtract one. Divide by one less than your original number. Now subtract your original number. Did you reach 1 for an answer? You should have. How does this number game work? Hint: Redo the number

    asked on November 2, 2010
  93. algebra

    9x -12 = 78. I need the steps to solve.

    asked on March 2, 2011
  94. physics

    Show that beta = 3 alpha Why a gas has two heat capacities?

    asked on March 10, 2010
  95. biology

    After a meal rich in starch, the blood with the highest concentration of sugar would be in what blood vessel? What are the 2 blood vessels containing blood with the highest concentration of oxygen?

    asked on September 16, 2009
  96. sociology

    WHy did the government of the US refused to become involved in the Rwandan genocide, but did intervence a few years later in Kosovo?

    asked on July 28, 2009
  97. Geometry

    Two ships leave San Francisco at the same time. One travles 40 degrees W of N at the speed of 20 knots. The other travels 10 degrees W of south at a speed of 15 knots. How far apart are they after 11 hours?

    asked on March 3, 2008
  98. bearing

    A ship is due east of a harbour. Another ship is also 3km from the harbour but on a bearing 042 degrees from it a. Find the distance between the two ships b. Find the bearing of the second ship from the first ship

    asked on May 13, 2017
  99. chemistry

    a thermometer containing 9.5g of mercury has broken. If Mercury has a density of 13.6g/ml what volume spilled

    asked on July 12, 2015
  100. physics

    A skier of mass 74.6 kg is pulled up a slope by a motor-driven cable. How much work is required to pull the skier 63.3 m up a 39.0◦ slope (assumed to be frictionless) at a constant speed of 2.0 m/s? The acceleration of gravity is 9.81 m/s 2 . Answer in

    asked on January 29, 2015


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