Mandy

Most popular questions and responses by Mandy
  1. Chemistry

    Which of the following will be more soluble in an acidic solution than in pure water? AgI, Ni(OH)2, KClO4, SrSO4, CaCO3

    asked on December 5, 2013
  2. English; conmas

    Where should commas be placed? Combine flour shortening pecans and cold water to make a tasty pie crust.

    asked on November 16, 2011
  3. AP CHEMISTRY NEED HELP PLEASE!

    Calculate the enthalpy of combustion of C3H6: C3H6 (g) + 9/2 O2 (g) yield 3CO2 + 3H2O using the following data: 3C (s) + 3H2 (g) yield C3H6 (g) change in H= 53.3 kJ C(s)+O2 (g) yield CO2 (g) change in H= -394kJ H2 (g) + 1/2 O2 (g) yield H2O (l) change in

    asked on January 24, 2012
  4. Chemistry

    Of the compounds below,_____ has the smallest ionic separation and why? A.RbF B.K2S C.SrBr2 D.KF E.RbCl --> How does one determine if a compound has a high or low ionic separation, and what is ionic separation?

    asked on March 20, 2017
  5. History!

    Can someone please help me? Thanks! I'm really behind and i need to get caught up and i just really need some help! Thanks!! :) 1. As a result of the French and Indian War, _____ claimed all land west of the Mississippi River, and _____ gained control of

    asked on December 18, 2013
  6. Business Math

    A local Barnes and Noble paid a $79.33 net price for each calculus textbook. The publisher offered a 10% trade discount. What was the publisher’s list price? (Round your answer to the nearest cent.)

    asked on February 27, 2014
  7. Chemistry - pH

    Calculate the pH of each of the following solutions: a) .35 M hydrochloric acid, HCl b) .35 M acetic acid, HC2H3O2 c) .35 M sodium hydroxide, NaOH Can someone please explain to me how to calculate the pH in a way that is easy to understand? I am confused.

    asked on September 14, 2009
  8. chemistry

    Write a Lewis structure of OSF4 in which the formal charges of all atoms are zero

    asked on November 14, 2008
  9. Science

    Can someone please please help me? I don't have a text book, i have a online book and it isn't working. Can someone please be nice and help me? Science isn't my subject! 1. Why is Earth’s temperature just right for life? (1 point) Earth’s core is hot

    asked on January 21, 2014
  10. PHYSICS HELP ASAP

    a 3 kg block slides down a frictionless plane inclined 20 degrees to the horizontal. If the length of the plane's surface is 1.50m, how much work is done, and by what force? suppose the coefficient of kinetic friction between the block and the plane. What

    asked on January 10, 2011
  11. Chem

    A 0.170-mole quantity of NiCl2 is added to a liter of 1.20 M NH3 solution. What is the concentration of Ni2 ions at equilibrium? Assume the formation constant* of Ni(NH3)62 is 5.5 × 108.

    asked on December 5, 2013
  12. Chemistry

    Can anyone help and check my answers? A. 8.43 cm to millimeters--- 84.3 millimeters. B. 2.41x10^2 cm to meterss--- 0.0241 meters. C. 294.5 nm to centimeters--- I don't know how to concert this. D. 1.445x10^4 m to kilometers--- 0.001443 Kilometers. E. 235.3

    asked on July 21, 2008
  13. Chemisrty

    if electricity of sufficient voltage is passed into a solution of potassium iodide in water, a reaction takes place in which elemental hydrogen gas and elemental iodine are produced, leaving a solution of potassium hydroxide. what is the unbalanced

    asked on March 20, 2016
  14. chemistry

    the solubility of Kl is 50g in 100g of H2O at 20 celcius, if 110g of Kl are added to 220g of H2O, is the soultion saturated or unsaturated? and what is the %m/m of the solution?

    asked on November 16, 2011
  15. Mathematics

    The difference between two numbers is 9 and the product of the numbers is 162. Find the two numbers. Explain your working

    asked on November 22, 2011
  16. social studies

    The northwest ordinance provided for all of the following except: a. the eventual creation of three to five states out of the Northwest Terrirtory b. a prohibiton on slavery c. freedom of whorship d. discuss the future of the northwest territory

    asked on March 25, 2010
  17. Chemistry

    Of the compounds below,_____ has the smallest ionic separation and why? A.RbF B.K2S C.SrBr2 D.KF E.RbCl --> How does one determine if a compound has a high or low ionic separation, and what is ionic separation?

    asked on March 20, 2017
  18. college pre-calculus

    An investment of $4000 is deposited into an account in which interest is compounded monthly. Complete the table by filling in the amounts to which the investment grows at the indicated times. (Round your answers to the nearest cent.) r = 4%

    asked on September 18, 2012
  19. maths

    The sum of a number and four times its reciprocal is 5.Find possible values of the number.

    asked on January 28, 2014
  20. math

    Michael estimated his mass as 8 kilograms. Is his estimate reasonable? Justify your answer. Please help me thanks.

    asked on November 24, 2015
  21. Chemisty

    In the titration of total acid with sodium hydroxide, NaOH, it was determined that 36.03mL of 0.0980M NaOH was needed to neutralize all the acid in a 10.0mL aliquot of a powdered drink mix solution. In a second titration, it was determined that were 1.45 x

    asked on October 22, 2014
  22. Sentences

    What kind of sentence is this: Noah Webster supported himself through sales of his spelling book over 100 million copies of the book were sold. 1.Properly constructed sentence 2.Dangler 3.Run-on 4.Misplaced part We will start with the idea that this is NOT

    asked on October 19, 2006
  23. Chemisty

    Consider the reaction of sulfuric acid, H2SO4, with sodium hydroxide, NaOH. H2SO4(aq) + 2 NaOH(aq) -> 2H2O(l) + Na2SO4(aq). Suppose a beaker contains 35.0mL of 0.175M H2SO4. How many moles of NaOH are needed to react completely with sulfuric acid? Thank

    asked on October 22, 2014
  24. Math Trignometry

    . From the top of the 800-foot-tall Cartalk Tower, Tom sees a plane; the angle of elevation is 67°. At the same instant, Ray, who is on the ground 1 mile from the building, notes that his angle of elevation to the plane is 81° and that his angle of

    asked on May 19, 2016
  25. physics

    A 120 kg mass is blown apart into an 80 kg piece and 40 kg piece. after the blast, the two masses are moving apart with a relative velocity of 60 m/s. the total kinetic energy after the explosion is: A. 21 kJ B. 35 kJ C. 48 kJ D. 56 kJ E. 82 kJ Because of

    asked on August 6, 2007
  26. chemistry

    How do i calculate the effective nuclear charge of a 3d electron of copper? what is the zeff. for a electron in the 3d orbital of copper. i looked up the answer to be 13.20, but i calculated 13.05 this is my work: (1s2)(2s2 2p6)(3s2 3p6)(3d10)(4s1)

    asked on November 10, 2008
  27. psychology

    Bruce is furious when his midterm is returned with a C grade. He tells his sociology professor that he had read each of the assigned chapters three times, and if someone can do that and just be average, then there’s something wrong with the test! The

    asked on April 26, 2017
  28. Physics

    Why is the total distance traveled by a mass traveling in a circle of radius R during n revolutions, 2piRn?

    asked on March 6, 2011
  29. Chemistry II

    Acetone, C3H6O, is the main ingredient of nail polish remover. A solution is made up by adding 35.0mL of acetone(d=0.790g/mL) to 50.0mL of ethyl alcohol,C2H6O(d=0.798 g/mL). Assume that the volumes are additive. From this information calculate the molarity

    asked on September 27, 2009
  30. chemistry

    Al2O3(s)+6NO(g)---->5N2(g)+6H2O(l) how many grams of Nitric Oxide are required to produce 145g of nitrogen in the following reaction?

    asked on February 27, 2012
  31. math

    Nine friends share 12 pounds pecans equally. how many pounds does each friend gets equally?

    asked on November 9, 2016
  32. physics

    a passenger at an airport pulls a rolling suitcase by its handle. If the force used is 10N and the handle makes an angle of 25 degrees to the horizontal, what is the work done by the pulling force while the passenger walks 200m?

    asked on January 6, 2011
  33. Chemistry

    The Ksp of calcium hydroxide, Ca(OH)2, is 4.68 x 10-6 at 289.15K. Calculate the pH of a saturated solution. Here's my work: 4.68 x 10-6= 4s^3 s= 0.0105 -log(0.0105)= 1.98 14-1.98=12.02 The answer is supposed to be 12.324, but I'm not sure what I'm doing

    asked on December 4, 2014
  34. chemistry

    The value of pKb for the base ethylamine (CH3CH2NH2) is 3.19 at 25°C, while the pKa for formic acid (HCO2H) is 3.74, also at 25°C. a) Calculate the value of the equilibrium constant Kc for the following aqueous equilibrium: HCO2– (aq) +

    asked on April 1, 2010
  35. Physics

    The center of a 1.50 diameter spherical pocket of oil is 1.20 beneath the Earth's surface. Estimate by what percentage directly above the pocket of oil would differ from the expected value of for a uniform Earth? Assume the density of oil is 800 kg/m^3.

    asked on March 17, 2011
  36. chemistry

    Draw the Lewis structure of NO2- Assign formal charges to each atom in the O3 molecule shown below. Be sure to click the +/- button below (it will turn yellow when activated) before clicking on the molecule. .. .. .. :O--O==O .. .. Based on formal charges,

    asked on November 14, 2008
  37. calculus

    A potter forms a piece of clay into a cylinder. As he rolls it, the length,L, of the cylinder increases and the radius, r, decreases. If the length of the cylinder is increasing at .1 cm per second, find the rate at which the radius is changing when the

    asked on February 3, 2010
  38. Organic chemistry

    In Hydration of 2-Ethyl-1-Butene which is the major product and which is the minor product? possible products are 3-methyl-3-pentsnol with a bp of 123C and 2-ethyl-1-butanol with a bp of 146C. Thank you!

    asked on November 27, 2010
  39. Physics

    The center of a 1.50 diameter spherical pocket of oil is 1.20 beneath the Earth's surface. Estimate by what percentage directly above the pocket of oil would differ from the expected value of for a uniform Earth? Assume the density of oil is 800 kg/m^3.

    asked on March 18, 2011
  40. Chemistry

    What volume of 5.0 M H2SO4 should be diluted to 100mL to prepare a 0.25 M H2SO4 M solution? I know the molar mass of H2SO4 is 98g but I'm not sure where exactly that fits in and how I'm supposed to get it to be diluted. Thank you!

    asked on October 8, 2014
  41. Chemistry

    A student performed an anaysis of a samply for its calcium content and got the following results : 14.92% , 14.91%, 14.88% , 14.91% the actualy amount of calcium in te sample is 15.70%. What conclusion can you draw about the accuracy and precision of these

    asked on July 15, 2008
  42. Physics

    Measuring coefficients of friction. A coin is placed near one edge of a book lying on a table, and that edge of the book is lifted until the coin just slips down the incline. The angle of the incline Theta C, called the critical angle, is measured. (a)

    asked on September 27, 2009
  43. Geography

    Which is the result of zero population growth? population stability no natural increase*** a rapid decline in human population the elimination of high density populations

    asked on May 6, 2016
  44. PreAP Physics

    Pam has a mass of 40Kg and she is at rest on smooth, level, frictionless ice. Pam Straps on a rocket pack. The rocket supplies a constant force for 22m and Pam acquires a speed of 62 m/s. A) What is the magnitude of the force? B) What is Pam's final

    asked on November 30, 2011
  45. Chemistry II

    Acetone, C3H6O, is the main ingredient of nail polish remover. A solution is made up by adding 35.0mL of acetone(d=0.790g/mL) to 50.0mL of ethyl alcohol,C2H6O(d=0.798 g/mL). Assume that the volumes are additive. From this information calculate the molarity

    asked on September 27, 2009
  46. math

    Fran works due north of home. Her husband Alan works due east. By the time Fran is 7 miles from home, the distance between them is one mile more than Alan's distance from home. How far from home is Alan? Miles Please and thank you in Advanced!!!

    asked on December 11, 2011
  47. Math: Multistep area problems

    Mark is covering an 8-inch-square board with 1-inch-square tiles. He uses gray tiles to make four 2-in. by 2-in. squares. He covers the rest of the board with white tiles. How many more white tiles than gray tiles will Mark use?

    asked on June 2, 2016
  48. college physics

    Two solid spheres A and B are made from the same material. The mass of sphere B is eight times that of sphere A. If the radius of sphere A is 7.50 cm, what is the radius of sphere B? [Volume of a sphere of radius r is given by V = 4ðr63/3]

    asked on January 19, 2010
  49. english

    WHOEVER has made a voyage up the Hudson must remember the Kaatskill mountains. They are a dismembered branch of the great Appalachian family, and are seen away to the west of the river, swelling up to a noble height, and lording it over the surrounding

    asked on May 4, 2013
  50. AP CHEMISTRY

    what volume of nitrogen at 215 degrees celsius and 715mm Hg would be required to react with 0.100 mol of hydrogen to produce ammonia? N2(g) + 3H2(g)-->2NH3(g)? Any help is greatly appreciated.

    asked on December 8, 2011
  51. english

    At the foot of these fairy mountains the voyager may have descried the light smoke curling up from a village whose shingle roofs gleam among the trees, just where the blue tints of the upland melt away into the fresh green of the nearer landscape. It is a

    asked on May 5, 2013
  52. Physics

    A boat takes 2.70 hours to travel 40.0 km down a river, then 5.90 hours to return. How fast is the river flowing?

    asked on September 14, 2008
  53. Science

    Give one reason how each of the points below effect the ecological footprint. -Forest -Fishing grounds -Cropland -Grazing land -Buildup land

    asked on February 3, 2019
  54. maths

    A woman is now 4 times older than her daughter.Six years ago,the product of their ages was 136.Find their present ages.

    asked on January 26, 2014
  55. physics

    You know your mass is 69 kg , but when you stand on a bathroom scale in an elevator, it says your mass is 78 kg. What is the magnitude of the acceleration of the elevator?

    asked on March 17, 2011
  56. geometry

    The longer diagonal of a rhombus is 2 times as long as the shorter diagonal. Find the length of the shorter diagonal if the area is 24in squared.

    asked on March 24, 2010
  57. English

    Which word best matches the meaning of want best used in this sentence? (Many a time we were near suffocation, from the want of fresh air.)

    asked on November 4, 2015
  58. AP CHEMISTRY NEED HELP PLEASE

    What Volume of nitrogen at STP would be required to react with 0.100 mol of hydrogen to produce ammonia? N2(g) +3H2 (g)(arrow) 2NH3(g)

    asked on December 8, 2011
  59. PreAp Physics

    You are walking from your math class to your science class carrying a book weighing 112N. You walk 45 meters down the hall, climb 4.5 meters up the stairs and then walk another 40 meters to your science class. What is the total work performed on your

    asked on November 23, 2011
  60. capitalization

    we listened to that old song again,"you and me against the world." (We, You, And, Me, Against, The, World )

    asked on June 1, 2009
  61. ART ( please help)

    i have been working one this paper for a few days and i have been struggling with it, I need to write about the elements and principles of the art piece "Polly, Minou and Eon" by Will Barnet. I cannot seem to figure out any of the elements and principles

    asked on October 29, 2011
  62. chemistry

    200cm^3 of 1.0 mol dm^-3 sulphuric acid,H2SO4 is poured into a 250 cm^3 volumetric flask.Distilled water is then added to make 250 cm^3 of solution. (a)What is the molarity of the diluted acid solution? (b)What is the volume of 1.6 mol dm^-3 sodium

    asked on May 7, 2014
  63. chemistry

    Al2O3+6HCl----->AlCl3+3H2O what type of reaction is this? -combination -decompisition -or double displacement reaction

    asked on February 27, 2012
  64. math

    Solve the equation by using the square root property. Simplify all radicals. (a) x2 = 256 (b) t 2 = -144

    asked on December 3, 2011
  65. physics

    a battery with and emf of 12V and an internal resistance of 0.5 ohms, is connected in series to a resistor of 5.0 ohms. what is the terminal voltage (n V) of the battery?

    asked on April 12, 2010
  66. physics

    A ladder rests inclined against a wall. Are you safer on the ladder when the floor is frictionless but the wall is rough or when the wall is frictionless and the floor is rough?

    asked on November 23, 2008
  67. chemistry

    For the following reaction, identify the substances oxidized, reduced and the oxidizing and reducing agents? 2SO2 + O2 --> 2SO3

    asked on October 30, 2013
  68. capitalization

    aunt consuelo is consuelo melendez, doctor of dental surgery. ( Aunt, Consuelo, Consuelo, Melendez, Doctor, Dental, Surgery )

    asked on June 1, 2009
  69. Genetics biology

    A man and his wife both have normal vision, but a daughter who has color blindness can the man sue his wife for infidelity? show the cross help me please, have been lots of people saying no and yes to this

    asked on February 20, 2015
  70. chemistry

    For the following reaction, identify the substances oxidized, reduced and the oxidizing and reducing agents? 2SO2 + O2 --> 2SO3

    asked on October 30, 2013
  71. english

    Sally wants a new bicycle, but her mother and father will not buy her one. correct punctuation

    asked on June 1, 2009
  72. maths

    In a class of 49 students, there are 21 boys. What fraction of the class are boys?

    asked on October 15, 2019
  73. Math

    an artist intends to paint a 60-square-foot mural on a large wall that is 18 ft wide and 11 ft tall. find the dimensions of the mural if the artist leaves a border of uniform width around it.

    asked on May 1, 2019
  74. stoichiometry

    How many grams of Nitric oxide are required to produce 145g of nitrogen in this reaction: Al2O3(s)+6NO(g)---->5N2(g)+6H2o(l)

    asked on November 17, 2011
  75. Chemistry

    Calculate the change in pH when 5.00 mL of 0.100 M HCl(aq) is added to 100.0 mL of a buffer solution that is 0.100 M in NH3(aq) and 0.100 M in NH4Cl(aq).

    asked on December 5, 2013
  76. Biology

    Cancer cells differ from normal cells in that they exhibit all of the following except a. large cytoplasm - i think this one is the answer b. irregular sizes and shapes c. have multiple nuclei d. abnormal number of chromosomes

    asked on January 24, 2019
  77. Chemistry

    Calculate the pH at the equivalence point for the titration of 0.180 M methylamine (CH3NH2) with 0.180 M HCl. The Kb of methylamine is 5.0× 10–4.

    asked on December 5, 2013
  78. chemistry

    which temperature is colder: 50F or 50C???

    asked on September 26, 2012
  79. Biology

    Two genes in a melanoma patient are found to have a correlation coefficient of 0.92. This indicates that these two genes. a. behave similarly: slight relationship b. behave similarly: strong relationships c. behave differently: strong relationships. d.

    asked on January 24, 2019
  80. chemistry

    A student dissolved 3.65 g of hydrogen chloride gas,HCL in water to make 1.0dm^3 of solution.Calculate the volume of a 0.1 mol dm^-3 barium hydroxide,Ba(OH)2 solution required to completely neutralise 25.0 cm^3 of the acid solution.(RAM:H,1;CL,35.5)

    asked on May 7, 2014
  81. Business Math

    True Value received an invoice dated 4/28/12. The invoice had a $5,700 balance that included $600 freight. Terms were 5/10, 4/30, n/60. True Value pays the invoice on May 12. What amount does True Value pay?

    asked on February 27, 2014
  82. physics

    Two solid spheres A and B are made from the same material. The mass of sphere B is eight times that of sphere A. If the radius of sphere A is 7.50 cm, what is the radius of sphere B? [Volume of a sphere of radius r is given by V = 4ðr63/3]

    asked on January 19, 2010
  83. Chemistry II

    Calculate the enthalpy change in kilojoules when 54.7g of MgCO3 decomposes according to the following equation: MgCO3 (s) into MgO (s) + CO2 (g) My delta H answer was 100.6 KJ but the real answer is 76.1 KJ. Can someone please help?

    asked on November 29, 2009
  84. Chemistry II

    Acetone, C3H6O, is the main ingredient of nail polish remover. A solution is made up by adding 35.0mL of acetone(d=0.790g/mL) to 50.0mL of ethyl alcohol,C2H6O(d=0.798 g/mL). Assume that the volumes are additive. From this information calculate the molarity

    asked on September 27, 2009
  85. Using Acetic Acid as an Oxidizing Agent

    Hi, We did an experiment in lab and our professor asked us why we used acetic acid as our oxidizing agent NaOCl + CH3COOH --> HOCl + CH3COO- Na+ for the above reaction? I'm thinking it has to do with the fact that it is a relatively weak acid and can be

    asked on February 10, 2009
  86. Math

    A boat crew rowed 20 miles downstream, with the current, in 2hours. The return trip upstream, against the current, covered the same distance, but took 5 hours. Dine the crew's rowing rate in still water and the rate of the current? Still water _ MPH and

    asked on December 11, 2011
  87. PreAP Physics

    A force of 600N is applied to a metal box to pull it 15 m across a floor. The roped used to pull the box is held at an angle of 46 degrees with the floor. How much work is done? My answer is w= 6251.93J

    asked on November 23, 2011
  88. Chemistry

    In Hydration of 2-Ethyl-1-Butene which alcohol is predominant? Thanks!!!

    asked on November 27, 2010
  89. Chemistry II

    Eugenol, the active ingredient in cloves, has a formula of C10H12O2. What is the boiling point of a solution containing 1.14g of eugenol dissolved in 10.0g of benzene? The boiling point of benzene is 80.1C and the boiling point elevation constant for

    asked on September 28, 2009
  90. english

    Parents want their children to go to college; however, they do not always have the funds to send them. correct punctuation

    asked on June 1, 2009
  91. english

    My little sister is a big baby; she cries all the time. correct punctuation

    asked on June 1, 2009
  92. algebra; slope

    what did the ape think of the grape's house?its not divine that's not enough letters! according to some students, what if the true purpose of homework?

    asked on January 14, 2009
  93. CHEMISTRY

    I need help please. "what voluma [in mL] at STp will be occupied by 0.0035 mol of methane [CH4]" THANK YOU SOO MUCH!

    asked on May 21, 2008
  94. maths

    In a class of 49 students there are 21 boys What fraction of the class are girls?

    asked on October 15, 2019
  95. Child Care

    Research suggest that every youngster should receive emotional support from at least three... a)legal guardians b)nonparental adults c)peers d)school friends I'm really stuck on this one.

    asked on December 5, 2012
  96. PREAP Physics

    From what height would a compact car have to be dropped to have the same kinetic energy that it has when being driven at 100 km/hr?

    asked on December 1, 2011
  97. addmath A.P.

    Tn=3n-2 Find the first term,a;the common difference,d;and then find the 5th term.

    asked on March 7, 2015
  98. chemistry

    Calculate the volume of 2.0 mol dm^-3 sulphuric acid,H2SO4 needed to prepare 2.5 dm^3 of 0.5 mol dm^-3 of the same acid solution.

    asked on May 5, 2014
  99. add maths

    Given that log2 3=h and log2 5=k, express log2 0.45 in terms of h and k.

    asked on May 3, 2014
  100. chemistry

    balance:H2(g)+S2(g)------->H2S(G)+heat A.) how would the equilibrium be affected give the following: - increase in temperature - increase in hydrogen concentration - increase in reaction container of volume B.) is equilibrium homogeneus or heterogeneus?

    asked on February 28, 2012

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