ivy

Popular questions and responses by ivy
  1. chemistry

    what is the meaning of the numeral represented by X in the general formula for hydrate salt * XH2O

    asked on April 26, 2011
  2. Chemistry

    Consider the following equation: 4NH3(g) + 5O2(g)----> 4NO(g)+6H2O(g) a. How many liters of oxygen are required to react with 2.5 L NH3? Both gases are at STP b. How many grams of water vapor can be produced from 25 L NH3 if both gases are at STP? c. How

    asked on November 29, 2010
  3. computers

    . Explain the following unexpected result: $ whereis date date: /bin/date ... $ echo $PATH .:/usr/local/bin:/usr/bin:/bin $ cat > date echo "This is my own version of date." $ ./date Fri May 22 11:45:49 PDT 2009

    asked on July 19, 2011
  4. Chemistry

    What is the molarity of the resulting solution when 300. mL of a 0.400 M solution is diluted to 800. mL?

    asked on December 6, 2010
  5. chemistry

    Crude oil pumped out of the ground may be accompanied by the formation of water, a solution that contains high concentrations of NaCl and other salts. If a boiling point of a sample of the formation of water is 2.0 Celsius above the boiling point of pure

    asked on August 10, 2013
  6. Earth Sci

    A cobble-sized sediment is naturally broken off the steep sides of a valley in a mountainous region. The sediment falls onto a glacier that occupies much of the valley. Over several years, the sediment “falls through” the glacier and is then dragged

    asked on January 7, 2009
  7. Chemistry

    What is the concentration of a H2SO4 solution if 10.0 mL of the solution is neutralized by 7.8 mL of a 0.20 M NaOH solution?

    asked on December 6, 2010
  8. Math

    You train for A race by running at a speed of 6 mph. A) At this speed, how many minutes does it take for you to run 3.2 miles? B) on race day, you run 3.2 miles in 30 minutes. What is your speed in miles per hour?

    asked on December 9, 2015
  9. organic chemistry

    An ether and an alkene are formed as by-products in this reaction. Draw the structure of these by-products and give mechanism for their formation.

    asked on October 24, 2011
  10. college Chemistry

    Why was there condensation of the beaker of cold water when a blue flame was passes underneath? This experiment is from the Gas Burner experiment. A) the product of carbon dioxide from combustion (B) the product of hydrogen dioxide from combustion (C) left

    asked on December 5, 2010
  11. Ap Chemistry

    HOw much energy is required to ionize a mole of Hydrogen atoms?

    asked on September 8, 2011
  12. Physiology

    Suppose a salt and a glucose solution are separated by a membrane that is permeable to water but not to the solutes. The NaCl solution has a concentration of 1.95 g per 250 mL (molecular weight = 58.5). The glucose solution has a concentration of 9.0 g per

    asked on May 14, 2011
  13. calculus

    a toy balloon is in the shape of a sphere. it is being inflated at the rate of 20 in^3 / min. at the moment that the sphere has volume 64 cubic inches. what is the rate of change of the radius ?

    asked on February 9, 2017
  14. organic chemistry

    Aqueous sodium bicabonate used to wash the crude n-butyl bromide. a) What was the purpose of this wash? Give equation. b)Why would it be undesirable to waash the crude halide with aqueous sodium hydroxide?

    asked on October 24, 2011
  15. Chem 1

    Use oxidation states to identify the element that is being oxidized in the following redox reaction: Cu(s)+2 H 2 S O 4 (aq) → CuS O 4 (aq)+S O 2 (g)+2 H 2 O(l)

    asked on June 12, 2017
  16. Chemistry

    What is the mole of oxalic acid? Equation:H2C2O4 + 2NaOH---> Na2C2O4 + 2H2O *Moles of oxalic acid dihydrate is 0.032 mole. * Molarity of oxalic acid solution is 0.128 M oxalic acid solution. * Initial volume of Oxalic acid is 19.8 ml and Final volume is

    asked on December 7, 2010
  17. college Chemistry

    What is the mole of oxalic acid? Equation:H2C2O4 + 2NaOH---> Na2C2O4 + 2H2O *Moles of oxalic acid dihydrate is 0.032 mole. * Molarity of oxalic acid solution is 0.128 M oxalic acid solution. * Initial volume of Oxalic acid is 19.8 ml and Final volume is

    asked on December 6, 2010
  18. math

    Which quantity is proportional to 65⁄5?

    asked on January 9, 2020
  19. Chemistry

    What volumes will each of the following occupy at STP? a. 1.80 x 10^24 molecules of SO3 b. 7.5 mol C2H6 c. 25.2 grams chlorine

    asked on December 12, 2010
  20. Chem 22

    balance molecular formula, total ionic formula and net ionic formula of Sr(NO3)2 + Al2(SO4)3. Thank you

    asked on December 2, 2010
  21. Chemistry

    A sample of propane gas, C3H8, was collected over water at 25 degree Celsius and 745 torr. The volume of the wet gas is 1.25 L. What will be the volume of the dry propane at standard pressure?

    asked on December 12, 2010
  22. Math

    Rick rides 11 1/8 miles in an hour with his bike in second gear going uphill. If Rick rides downhill in fourth gear he goes 2 1/2 faster. How many miles will Rick go in an hour downhill in fourth gear?

    asked on January 7, 2012
  23. Chemistry

    What mass of silver nitrate is dissolved in 40.0 mL of a 0.400 M solution of silver nitrate?

    asked on December 6, 2010
  24. organic chemistry

    Why must the alkyl halide product be dried carefully with anhydrous calcium chloride before the distillation?

    asked on October 24, 2011
  25. organic chemistry

    Why does the alkyl halide layer switch from the top layer to the bottom layer at the point where water is used to extract the organic layer?

    asked on October 24, 2011
  26. Chemistry 22

    Determine if the reaction produces a precipitate. For a precipitate mark ‘a’ and if there is no precipitate mark ‘b’. 8. KOH(aq) + Fe(NO3)3(aq)  9. MgCl2(aq) + Na(NO3)2(aq)  10. NaBr(aq) + Ag(NO3) (aq)  11. Na3PO4(aq) + Ba(NO3) 2(aq) 

    asked on December 4, 2010
  27. World History

    Using the graph on world trade and production, which describes the impact increased production in 1932 had on world trade? While production increased steadily after 1932, world trade would not be significantly affected until 1935. Increased production in

    asked on March 25, 2020
  28. Chemistry

    how many molecules of CH4 gas are present in a 1.00 L flask of CH4 gas at STP?

    asked on December 12, 2010
  29. Ap Chemistry

    Calculate the wavelength of light that must be absorbed by hydrogen atom in its ground state to reach the excited ste of E=+2.914*10^(-18)

    asked on September 8, 2011
  30. physics

    A train braking with constant deceleration covers 1km in 20s, and a second kilometre in 30s. Find the Deceleration. Wgat further distance will it cover before coming to a stop. and how long will it take?

    asked on June 18, 2011
  31. Chemistry

    A 120. mL sample of a gas is at a pressure of 1.50 atm. If the temperature remains constant, what will be its volume at 3.50 atm of pressure?

    asked on December 6, 2010
  32. Chemistry 22

    which illustrates in an increase in potential energy? a. a firecracker explodes b. a person climbs a set of stairs c. a wind-up toy winding down d. an apple dropping from a tree

    asked on September 11, 2010
  33. Physiology

    Indicate the site of the following activity in the digestive system (mouth, esophagus, stomach, small intestine, large intestine, liver, gall bladder, pancreas). 1.breakdown of cholesterol by formation of bile acid 2. principal site of formation of folic

    asked on May 18, 2011
  34. Physiology

    Before the invention of refrigerators, pioneers preserved meat by salting it. Explain how meat can be preserved by this procedure.(Hint: think about what salting the meat would do to decomposer organisms, such as bacteria and fungi)

    asked on May 14, 2011
  35. Math

    When Cheryl goes mountain climbing, she rests every 15 minutes that she climbs if Cheryl’s combined time is 2 hours, how many minutes does she rest? Need the answer due tomorrow!!

    asked on April 23, 2019
  36. english

    uncle tom cabin What specific event precipitated the writing of Uncle Tom s Cabin? Find the information in a documented source whose author you can identify

    asked on December 17, 2017
  37. chemistry

    Write net ionic equation for the reaction between nitric acid and calcium hydroxide.

    asked on February 10, 2012
  38. Chemistry

    Which one in this pair has the larger radius? Explain a. Calcium atom or calcium ion b. Aluminum ion or Magnesium ion

    asked on December 12, 2010
  39. Chemistry

    if antiseptic hydrogen peroxide is 3% H2O2 by mass, approximately how many moles of H2O2 are present in each gram of antiseptic solution? you can assume the solution has the same density as water. show your calculations.

    asked on December 2, 2011
  40. organic chemistry

    what are the formulas of the salts that may precipitate when the reaction mxture is cooled?

    asked on October 24, 2011
  41. english

    uncle tome cabin Gradually and imperceptible the strange, silent, patient man, who was ready to bear everyone else's burden, and who sought help from none,--who stood aside for all, and came last, and took least, yet was foremost to share his little all

    asked on December 17, 2017
  42. Philosophy

    True/False 1. Rosenstand argues that moral subjectivism is an intuitively sound, "live and let live" kind of moral position that is both appealing and socially cohesive. 2. For the members of the Flat Earth Society, who believe that all physical evidence

    asked on July 10, 2014
  43. Algebra

    Write a proportion using an unknown value x and the ratio 5:6 then solve it. In an orchestra, the ratio of trombones to violas is 1 to 3. There are 9 violas, Write a proportion that gives the number t of trombones in the orchestra. How many trombones are

    asked on April 16, 2015
  44. Chemistry

    An unknown metal, heated to an unknown temperature until a liquid is dropped into a calorimeter that has 250 ml of water. The water heats up from 22 degrees Celcius to 29 degrees Celcius, at which point the temperature of the water and metal are equal. How

    asked on December 4, 2010
  45. Chemistry 22

    1. Lead (Pb), has a density of 11.35 g/ml. If I have 3.45 cc of lead, what is the weight in grams? 4. I am traveling at 100 mph per hour before getting pulled over. Convert this into meters Per second. (A) 161 m/s (C) 161000 m/s (B) 4.44 m/s (D) 44.4 m/s

    asked on August 31, 2010
  46. Algebra (check my work?)

    1. Write a proportion using an unknown value x and the ratio 5:6 then solve it. 5/6 = x/12 6 * 2 = 12 5 * 2 = 10 x = 10 2. In an orchestra, the ratio of trombones to violas is 1 to 3. There are 9 violas, Write a proportion that gives the number t of

    asked on April 17, 2015
  47. chemistry

    A sample of propane, \rm C_3H_8, contains 12.8 moles of carbon atoms. How many total moles of atoms does the sample contain?

    asked on April 3, 2011
  48. Chemistry 22

    1. What is the Kelvin temperature of a system in which 4.50 mol of a gas occupy 0.250 L at 4.15 atm? 2. In the lab, students generated and collected hydrogen gas according to the following equations: Zn + H2SO4---> H2 + ZnSO4 a) How many mL of hydrogen gas

    asked on November 29, 2010
  49. Chemistry

    For the reaction: C4H10 + O2 ¨ CO2 + H2O ( is this balanced?) , how many moles of CO2 is formed when 5.00 moles C4H10 reacts with O2? A. 5.00 B. 1.25 C. 20.0

    asked on March 5, 2011
  50. Chemistry 22

    A 19.18 mL of 0.125 M Oxalic Acid (H2C2O42H2O) is titrated with a Ca (OH)2 solution. The initial volume of Ca(OH)2 was 14.38 and the final volume of Ca(OH)2 was 28.29 mL when the solution turned very slightly pink. What is the concentration of Ca (OH)2?

    asked on December 4, 2010
  51. Chemistry 22

    Your length measurement was 21.34 cm. The ‘accepted value’ was 21.77 cm. What is the percent error of your measurement?

    asked on December 4, 2010
  52. Chem 22

    1. What volume will a mixture of 5.00 mol of H2 and 0.500 mol of CO2 occupy at STP?

    asked on November 29, 2010
  53. chemistry AP

    give a scientific explanation for the following observations. Use equations or diagrams if they are relevant. A. it takes longer to cook an egg until it is hard-boiled in Denver (altitude 1 mile above sea level) than it does in NYC (near sea level).

    asked on January 28, 2008
  54. Dalton's Law of Partial Pressures

    A sample of propane gas, C3H8, was collected over water at 25 degree Celsius and 745 torr. The volume of the wet gas is 1.25 L. What will be the volume of the dry propane at standard pressure?

    asked on December 12, 2010
  55. Chemistry

    When 1 gram of sex hormone (contains C, H, and O) was burned in a combustion analysis, 1.5 grams of CO2 and 0.405 grams of H2O were obtained. The molar mass was found to be 352g/mol. What is the molecular formula for the sex hormone?

    asked on June 20, 2011
  56. Physiology

    Suppose you were to grind up and homogenate a pancreas. Do you think it would be possible to isolate insulin from this hemogenate? ( Hint: remember that the pancreas is also an exocrine gland, producing pancreatic juice) Explain your answer

    asked on May 14, 2011
  57. math

    Log√35 - log√7 + log√2

    asked on February 29, 2020
  58. Philosophy

    True/False 1. Rosenstand argues that moral subjectivism is an intuitively sound, "live and let live" kind of moral position that is both appealing and socially cohesive. 2. For the members of the Flat Earth Society, who believe that all physical evidence

    asked on July 9, 2014
  59. math

    An iceberg breaks off from the Antarctic continent and floats due north at constant velocity/ It's latitude south decreases by 1 degree in 8 days. Taking the circumference of the earth to be 40 000km, calculate the speed of iceberg in ms^-1.

    asked on June 17, 2011
  60. Physiology

    Would you expect the muscle fibers of the tongue to be striated or smooth? What about the muscle of the diaphragm? Explain your answer.

    asked on May 14, 2011
  61. english

    At the fair, not only can I eat tasty food, but I can also see awesome fireworks. need help making sure its a parallel structure and has linking words

    asked on February 5, 2015
  62. Physiology

    Indicate whether the following would increase or decrease during exercise.? 1.activity of the sympathetic nervous system 2.urine FORMATION 3.vasodilation of blood vessels in the skeletal muscles 4. stroke volume 5.venous return 6.activity of the vagus

    asked on May 18, 2011
  63. ECONOMICS

    UrGENT, PLS ANSWER MY QUESTION IMMEDIATELY!!! For each pair of commodities,state which do you think is more elastic and give your reasons:perfume and salt; penicillin and icecream; automobiles and automobile tires.

    asked on January 19, 2011
  64. Physiology

    If a man’s ideal weight is 165 lbs. and he weighs 185 lbs., how many pounds above his ideal weight is he? What percent above his ideal weight is he? ______________lbs. above ideal weight ______________% above ideal weight

    asked on February 9, 2011
  65. college Chemistry

    1. If 25 grams of Iron (III) hydroxide is dissolved in a 500mL volumetric flask, what is the Molarity of the solution? 2. An unknown metal has a volume of 5.25 mL and a density 2.71 g/mL. What is the weight of the metal in grams? 3. An unknown metal,

    asked on December 4, 2010
  66. Chemistry 22

    Other than a specific confirmatory test, give a simple test that would allow you to distinguish between the following pairs of anions and cations. Tell what you would do and what you should observe for each anions and cations. Anions: a. CO3 2- and NO3 -

    asked on November 17, 2010
  67. Math

    What is half of the answer in the sequence:1,1,2,8,3,27,4

    asked on September 12, 2019
  68. Science

    What is the source of the magma that fuels the island arc complex?

    asked on January 8, 2014
  69. physical

    what is the minimum length of the mirror needed to view the whole body at any distance?

    asked on February 3, 2011
  70. chem

    An unknown metal has a volume of 5.25 mL and a density 2.71 g/mL. What is the weight of the metal in grams?

    asked on December 4, 2010
  71. chemistry

    How many milliliters of 3.60 {\rm M} {\rm HCl} are required to react with 140 {\rm mL} of 1.60 {\rm M}{\rm Al}({\rm OH})_{3}?

    asked on April 23, 2011
  72. Biology

    What happened if you put the Elodea leaf cells in a solution of 0.5% NaCl,1.8% NaCl and 0.9%NaCl?

    asked on July 23, 2011
  73. chemistry

    Calculate each of the following quantities in 0.183 mole {\rm (C_3H_5)_2O}: Find the Atoms of H and C

    asked on April 3, 2011
  74. college Chemistry

    After subtracting the weight of the container, the Vanadium metal inside is found to weigh 8.34 grams. After reacting with Oxygen the newly formed compound weighs 21.43 grams. What is the empirical formula?

    asked on December 4, 2010
  75. Philosophy

    Can someone please check my answers if it is right. Thank you! True/False 1. Rosenstand argues that moral subjectivism is an intuitively sound, "live and let live" kind of moral position that is both appealing and socially cohesive. -FALSE 2. For the

    asked on July 11, 2014
  76. Physiology

    Indicate the effect of the hormone on the response (increase, decrease, no effect)? 1.__________________ effect of secretion of insulin on blood glucose levels 2.__________________ effect of secretion of ADH on blood pressure 3.__________________ effect of

    asked on May 18, 2011
  77. chemistry AP

    Give a scientific explanation for the following observations: Perspiring is a mechanism for cooling the body -is it because when something is heated it produces a salt and h2o, so when our body heats up the chemicals in our body let out salt and water,

    asked on January 29, 2008
  78. chemistry

    Calculate the pH of .100 of a buffer solution that is .25 M in HF and .50 M in NaF. What is the change in pH on addition of the following? A. .002 mol of HNO3 B. >004 mol of KOH I calculated the correct pH of the solution but am having trouble calculating

    asked on February 1, 2014
  79. Math

    A swimming pool is 16 meters wide and 25 meters long. At $50 per square meter. how much will a child-proof covering for the pool cost?

    asked on October 24, 2011
  80. Math

    The 16th term of an Arithmetric Progression is four times the 36th term, and exceeds it by 32. Finda the numbers.

    asked on March 28, 2011
  81. chemistry

    If 39.2 of 0.177 is required to neutralize completely 22.0 solution, what is the molarity of the acid?

    asked on May 7, 2011
  82. business

    I need help! We have to create a business and i have no clue what a 'mission statement' is or anything so please help me! (^~*)

    asked on August 23, 2016
  83. MATH

    A ship sails north, then turns 45° in a clockwise direction. After another hour, it turns clockwise 90°. In which direction is the ship now sailing? 90 + 45 = 135° west?

    asked on March 16, 2015
  84. chemistry

    Draw the condensed structural formulas of ethyl alcohol

    asked on May 22, 2011
  85. Physiology

    Match the hormone or regulatory mechanism to digestive function.? a. Enterokinase b. gastrin c. intestinal cells of Cajal d. cholecystokinin e. CFTR f.enteric nervous system 1._______ this hormone contributes to the secretion of pancreatic juice 2._______

    asked on May 18, 2011
  86. Physiology

    Obesity is defined medically as 20% above a person’s ideal weight. If a person’s ideal weight is 72 kg, when (above what weight) would that person be considered obese? ________________kg

    asked on February 9, 2011
  87. chem AP

    Give a scientific explanation for the following observations. Use equations or diagrams if they are relevant. A. burning coal containing a significant amount of sulfur leads to "acid rain". B. Perspiring is a mechanism for cooling the body. C. At room

    asked on January 28, 2008
  88. Chemistry

    A 21.18 mL of 0.250 M NaOH is titrated with a H2SO4 solution. The initial volume of H2SO4 was 13.28 and the final volume of H2SO4 was 28.29 mL when the solution turned very slightly pink. What is the concentration of H2SO4?

    asked on December 7, 2010
  89. Chemistry

    As one descends group 6A of the periodic table, the number of valence electrons found in each element? A. Increases B. Decreases C. Remains the same

    asked on December 7, 2010
  90. college Chemistry

    A 21.18 mL of 0.250 M NaOH is titrated with a H2SO4 solution. The initial volume of H2SO4 was 13.28 and the final volume of H2SO4 was 28.29 mL when the solution turned very slightly pink. What is the concentration of NaOH?

    asked on December 7, 2010
  91. Chemistry

    What is the concentration of a HCl solution if 20.0 mL of the solution is neutralized by 15.0 mL of a 0.10 M Ca(OH)2 solution?

    asked on December 6, 2010
  92. college Chemistry

    A 21.18 mL of 0.250 M NaOH is titrated with a H2SO4 solution. The initial volume of H2SO4 was 13.28 and the final volume of H2SO4 was 28.29 mL when the solution turned very slightly pink. What is the concentration of NaOH?

    asked on December 6, 2010
  93. MATH

    which following trinomial is a perfect square? A. x^2 + 2x - 3 B. x^2 - 4x - 4 C. x^2 + x + 1/4 D. x^2 - x -56 question B & C 1-term and 3-term is perfect square. how do figure which is perfect square?

    asked on January 30, 2015
  94. Logic

    Eric is planning a 7-day resort vacation. He will play golf on four mornings. He also wants to play tennis but can only play tennis on days he does not play croquet. He will play croquet on any day immediately following a day that he plays golf. What is

    asked on July 31, 2014
  95. chemistry

    A Solute That Removes Hydrogen Ions from Solution

    asked on February 23, 2012
  96. physiology

    How is this hormones regulated: hypothlamus/pituitary axis, nervous system,feedback inhibition indicate which? 1. Follicle stimulating hormone 2. Cortisol 3. Antidiuretic hormone 4. Parathyroid hormone 5. Thyroid-stimulating hormone 6. Insulin 7.

    asked on April 11, 2011
  97. physiology

    Is the hormone protein,steroid or glycoprotein? 1. Follicle-stimulating hormone 2. Cortisol 3. Antidiuretic hormone 4. Parathyroid hormone 5. Thyroid-stimulating hormone 6. Insulin 7. Norepinephrine

    asked on April 9, 2011
  98. neurotransmitters

    There may be more than one region in which the neurotransmitter is active. Choose one, and make sure your answer in column 4 matches the region identified in column 3. 1.Glutamate a.Is it excitatory or inhibitory (indicate which)? b. Name a specific region

    asked on March 18, 2011
  99. Physiology

    Why is it important to clear a neurotransmitter quickly from the synaptic cleft? What might happen to the target muscle cell if the neurotransmitter were NOT cleared? What might happen if neurotransmitter reuptake occured too quickly?

    asked on March 29, 2011
  100. statistics

    A student has a mean score of five tests taken. What score must she obtain on her next test to have a mean average of 88 on all six tests?

    asked on November 12, 2015

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