lauren

Popular questions and responses by lauren
  1. Chemistry

    a diver exhales a bubble with a volume of 250 mL at a pressure of 2.4 atm and a temperature of 15 degrees celcius. What is the volume of the bubble when it reaches the surface where the pressure is 1.0 atm and the temperature is 27 degrees celcius

    asked on November 14, 2012
  2. chemistry

    You are a workstudy for the chemistry department. Your supervisor has just asked you to prepare 500mL of 3M HCl for tomorrow's undergraduate experiment. In the stockroom explorer, you will find a cabinet called "Stock Solutions". Open this cabinet to find

    asked on April 1, 2019
  3. Chemistry

    N2(g) + 3H2(g)  2NH3(g) at STP How many litres of ammonia gas is produced using 5 litres of H2? N2 + 3H2 ---> 2NH3 - the ratio between H2 and NH3 is 3 : 2 - it's given 5 litres of H2, so the volume of NH3 formed is 5/3*2 = 10/3 = 3.33 (L) Sig FIG ANSWER

    asked on March 29, 2019
  4. Chemistry

    Convert 25 mL of 0.80 mol/L Mg(NO3)2(aq) into moles moles of Mg(NO3)2 = 0.8 x (25/1000) = 0.02

    asked on March 5, 2019
  5. Chemistry

    2 C8H18(g) + 25 O2(g)  16 CO2(g) + 18 H2O­(g) at STP How many moles of O2 are needed to react with 60.0g of C8H18 (octane)? mole of 02 = 60/114 = 53 mols 2 moles of octane =25 mols of 02 0.53/2 x 25= 6.625 answer is 6.6 mols How many litres of CO2 are

    asked on March 29, 2019
  6. Chemistry

    Zn(s) + 2HCl(l)  ZnCl2(s) + H2(g) at STP What mass of zinc is needed to produce 115 mL of hydrogen? - it's given 115 mL of hydrogen, so can convert to 115/1000/22,4 = 0.0051 moles H2 - the ratio between HCl and H2 is 2 : 1, so the moles of HCl needed

    asked on March 29, 2019
  7. Chemistry

    Complete this Bronsted-Lowry reaction, placing each product by it's appropriate label. HSO4- + BrO- ____ (ACID) + ____ (BASE)

    asked on November 15, 2013
  8. Chemistry

    Consider an ideal gas encloesd in a 1.00 L container at an internal pressure of 10.0 atm. Calculate the work, w, if the gas expands against a constant external pressure of 1.00 atm to a final volume of 20.0 L. w = ____ J now calculate the work done if this

    asked on February 10, 2012
  9. chemistry

    2 KOH(l) + H3PO4(l) --> K2HPO4(l) + 2 H2O(l) a) How many mL of 0.450M KOH is needed to react with 60.0mL of 0.250M H3PO4? a) 0.060L x 0.250M = 0.015 mol H3PO4 0.015mol H3PO4 x 2mol KOH / 1mol H3PO4 = 0.03 mol KOH 0.03 mol KOH x 1L/0.450 mol = 0.06667L =

    asked on March 29, 2019
  10. Chemistry

    a precipitate is expected when an aqueous solution of potassium iodide is added to an aqueous solution of: sodium sulfate iron(II) chloride calcium perchlorate barium hydroxide lead nitrate

    asked on December 12, 2007
  11. Chemistry

    Complete the table by filling in the formula for the ionic compound formed by each pair of cations and anions, as shown for the first pair. Ion K+ NH+4 Mg2+ Fe3+ Cl- OH- CO3 2- PO3- 4 Complete the fourth row of the table.

    asked on November 16, 2011
  12. spanish

    what would the possesive pronoun be? Se me quedaron en casa los libros. ¿Trajo Ana ____ (hers)? Uso mi teléfono celular cuando viajo. ¿Cuándo usa Ramón _____ (his)? Tu profesora es muy simpática. _____ (Ours) es simpática también. Me encantan mis

    asked on December 15, 2012
  13. mathematiks concepts

    A must when introducing each whole number operation is to A. encourage the students to work fast. B. make liberal use of real-life story problems that the students can act out. C. begin with flash card games. D. be sure all students are on the same page in

    asked on February 24, 2015
  14. Math

    A cone-shaped pile of sawdust has a base diameter of 40 feet, and is 15 feet tall. Find the volume of the sawdust pile. Round your answer to the nearest hundredth if necessary. Use 3.14

    asked on June 8, 2016
  15. Physics

    A +3.0 nC charge is at x=0 cm and a -1.0 nC charge is at x=4 cm. At what point or points on the x-axis is the electric potential zero?

    asked on February 3, 2011
  16. statistics

    The number of column inches of classified advertisements appearing on Mondays in a certain daily newspaper has mean 320 inches and standard deviation 30 inches. Suppose that the results for 100 consecutive Mondays can be regarded as a random sample and let

    asked on August 8, 2012
  17. Texas State History

    What is the purpose of the NAFTA treaty?

    asked on April 12, 2017
  18. Chemistry

    Decide which of the following bonds is least polar on the basis of electronegativities of atoms, H---S, Si---Cl, N---Cl.

    asked on November 30, 2007
  19. chemistry

    Fe2+(aq) + Cr2O7 2- (aq) →Fe3+(aq) + Cr3+(aq) Balance the equation by using oxidation and reduction half reactions. What is smallest possible integer coefficient of Cr3+ in the combined balanced equation?

    asked on September 28, 2011
  20. Geometry

    Quadrilateral ABCD is a parallelogram. If adjacent angles are congruent, which statement must be true? A. Quadrilateral ABCD is a square. B. Quadrilateral ABCD is a rhombus. C. Quadrilateral ABCD is a rectangle. D. Quadrilateral ABCD is an isosceles

    asked on July 5, 2017
  21. Physics

    A model electric train requires 6 V to operate. If the primary coil of its transformer has 240 windings, how many windings should the secondary have if the primary is connected to a 120 V household circuit?

    asked on November 10, 2009
  22. chemistry

    Solid zinc and aqueous hydrogen sulfate reacts to produce hydrogen gas and aqueous zinc sulfate Is this the right answer Z(aq)+HS equals H(G) ZS? if not can u please correct me

    asked on January 26, 2009
  23. Physics

    At time t = 0s, a puck is sliding on a horizontal table with a velocity 3.00 m/s, 65.0 above the +x axis. As the puck slides, a constant acceleration acts on it that was the following components: ax = 0.460m/s2 and ay = 0.980m/s2. what is the velocity of

    asked on February 14, 2008
  24. college math

    a bag contains 7 red chips and 9 blue chips. Two chips are selected randomly from the bag without replacement. What is the probability that the two chips are the same color? If someone could just point me in the right direction for the many equations I

    asked on November 23, 2009
  25. College Algebra

    Cassius drives his boat upstream for 30 minutes. It takes him 15 minutes to return downstream. His speed going upstream is two miles per hour slower than his speed going down stream. Find his upstream and downstream speed.

    asked on September 3, 2017
  26. English

    Which of the following is a good rule to follow when proofreading an essay? A. Scan the essay twice, once for organization and once for surface errors. B. Ask your best friend to critique your essay. C. Use the computer's spell-check and grammar-check

    asked on April 7, 2015
  27. geometry

    if a polyhedron has a volume of 14 cm and is dilated by a factor of 1/5, what will be the volume of the dilated polyhedron? ROund your answer to the nearest thousandth if necessary

    asked on June 23, 2014
  28. physics

    Unpolarized light passes through six successive Polaroid sheets each of whose axis makes a 59 degree angle with the previous one. What is the intensity of the transmitted beam, I/Io?

    asked on November 16, 2012
  29. chemistry

    a tank contains helium gas at 490 mmHg, nitrogen gas at 0.75 atm, and neon at 520 torr. What is the total pressure in atm?

    asked on November 14, 2012
  30. Physics w/ Calc

    A baseball approaches home plate at a speed of 43.0 m/s, moving horizontally just before being hit by a bat. The batter hits a pop-up such that after hitting the bat, the baseball is moving at 54.0 m/s straight up. The ball has a mass of 145 g and is in

    asked on October 16, 2011
  31. Chemisty

    Aluminum hydroxide forms a positively charged sol. Which of the following ionic substances should be most effective in coagulating the sol? NaCl CaCl2 Fe2(SO4)3 K3PO4 The idea behind coagulating sols is to use those salts that have the highest + and -

    asked on February 11, 2008
  32. PHYSICS (please help)

    Three masses are connected by a string. M1 = 1.0kg M2 = 2.0kg M3 = 3.0kg Mass one and two are on a table while mass three hangs off the edge of the table (there is a pulley). Find the tension in the string connecting m1 and m2. Assume the table is

    asked on November 14, 2014
  33. Chemistry

    A quantity of ice at 0.0 degrees C was added to 33.6 of water at 21.0 degree C to give water at 0.0 degrees C. How much ice was added? The heat of fusion of water is 6.01 kJ/mol and the specific heat is 4.18 J/(g * degrees C) q = mass x specific heat x

    asked on February 4, 2008
  34. Chemistry

    According to your calculations a reaction should yield 5.67 g of oxygen O2. What do you expect the volume to be at 23 degrees C and 0.985 atm? I got the all the amounts 5.67 g 23 degrees C = 296 K .985 atm And use the ideal gas law Can you help me out by

    asked on October 23, 2007
  35. Chemistry

    2. Complete the conversions below. Please show your work and include units in your final answer i. 8.5m = ? mm ii. 1.236km = ?cm iii. 400mL = ?L iv. 25.25cm = ? Tm v. 1zm = ? Zm vi. 45.6mol = ? mmol vii. 8,000,000km = ? nm viii. 1000cm3 = ? L ix. 25m3 = ?

    asked on November 5, 2018
  36. Chemistry

    The freezing point of ethanol is -114.6 C and its Kf value is 2.00 C/m. What is the freezing point for the solution prepared by dissolving 50.0 g of glycerin (C3H8O3) in 200.0 g ethanol? I used Change in temp=Kfm kf=2.00 I calculated m to be 2.1736. I

    asked on February 13, 2013
  37. algebra

    Sarah blends coffee for Tasti-Delight. She needs to prepare 170 lbs of blended coffee beans selling for $3.59 per pound. She plans to do this by blending together a high-quality bean costing $5.00 per pound and a cheaper bean at $2.00 per pound. To the

    asked on February 9, 2012
  38. PROB

    Researchers at the University of Pennsylvania School of Medicine have determined that children under 2 years old who sleep with the lights on have a 36% chance of becoming myopic before they turn 16. Children who sleep in darkness have a 21% chance of

    asked on October 19, 2010
  39. Trig

    Find the exact circular function value for: sec(23pi/6) I know the answer should be: [2sqrt(3)]/3, but I do not understand how to solve the problem. I have a unit circle, but 23pi/6 is not on it, so I don't know how to find the (x,y)

    asked on October 22, 2009
  40. Chemistry

    Caffeine C8H10N4O2, is a stimulant found in a tea and coffee. A sample of the substance was dissolved in 45.0g of choloroform CHCl3 to give a 0.0946m solution. How many grams of caffine were in the sample. m = molality

    asked on February 6, 2008
  41. Chemistry

    All of the following are weak acids except HF H3PO4 H2SO4 HNO2 HC2H3O2

    asked on December 11, 2007
  42. Science

    Helium gas in a balloon occupies 2.5 L at 300.0 K. The balloon is dipped into liquid nitrogen that is at a temperature of 80.0 k. What will the volume of the helium in the balloon at the lower temperature be? I got a weird answer like .66667 and i used

    asked on February 12, 2011
  43. statistics

    an airline estimates that 97%of people booked on their flights actually show up.if the airline books 70 people on a flight for which the maximum number is 68,what is the probability that the number of people who show up will exceed the capacity of theplane

    asked on December 5, 2009
  44. Chemistry

    Classify each of the following by the type of solid if forms: a. LiCl b. BaCl2 c. BCl3 d. CCl4 e. NCl3 I have four different types of solids to guess from like Metallic solid, ionic solid, molecular solid, covalent network solid and i don't know which goes

    asked on February 4, 2008
  45. Chemistry

    Predict the order of increasing vapor pressure at a given temperature for the following compounds: CH3CH2CH2CH2OH HOCH2CH2CH2OH CH3CH2OCH2CH3

    asked on February 2, 2008
  46. Chemistry

    What is the wavelength of the transition from n=4 to n=3 for Li2+? In what region of the spectrum does this emission occur? Li2+ is a hydrogen-like ion. Such an ion has a nucleus of charge +Ze and a single electron outside this nucleus. The energy levels

    asked on November 4, 2007
  47. Chemistry

    A bullet weighing 235 grains is moving at a speed of 2.52 X 10^3 ft/s. Calculate the kinetcic energy of the bullet in joules ahd in calories. One grain equals 0.0648 g. Can someone help me out on this please K. E.= 1/2 mv2 . Convert m to kg Convert ft/sec

    asked on October 29, 2007
  48. Chemistry

    What is the wavelength of a proton traveling at a speed of 6.21 km/s? What would be the region of the spectrum for electromagnetic radiation of this wavelength. For this one I did the same thing 6.63 X 10^-34/ (? kg)(6210 m/s) = How do get the kg for the

    asked on November 3, 2007
  49. math

    one estimate for the ideal body weight of a woman is shown below. use this information to answer part (a) through (d) 55kg+1.5kg for each inch over 5 feet (a) find a linear model for an estimate of the ideal weight of a woman using W for ideal body weight

    asked on March 3, 2016
  50. Chemistry

    Aspirin is prepared by heating salicylic acid, C7H6O3, with acetic anhydride, C4H603. The other product produced is acetic acid, C2H402. C7H6O3+C4H6)3->C9H8O4+C2H4O2 What is the theoretical yield in grams of aspirin, C9H8O4, when 2.00 grams of salicylic

    asked on November 6, 2012
  51. Geometry

    1. Let S be between R and T. Use the Segment Addition Postulate to solve for m. RS = 2m + 2 ST = 3m + 3 RT = 15 A. m = 3 B. m = 2 C. m = 9 D. m = 4

    asked on February 2, 2018
  52. CHEM

    Can you please check my work? I got -4.3KJ/mol If this is not right can you tell me what I am doing wrong? Thank you! Questions. 1.a. Use Hess's Law and the measured mean enthalpy changes for the NaOH-HCl and NH3-HCl reactions to calculate the enthalpy

    asked on November 8, 2013
  53. Chemistry

    A 0.1873 g sample of a pure, solid acid, H2X was dissolved in water and titrated with 0.1052 M NaOH solution. The balanced equation for the neutralization reaction occurring is H2X(aq) + 2NaOH(aq) ¨ Na2X(aq) + 2H2O(l) If the molar mass of H2X is 85.00

    asked on May 11, 2011
  54. science

    The combustion of acetylene in the presence of excess oxygen yields carbon dioxide and water: 2C2H2 (g) + 5O2 (g) ¨ 4CO2 (g) + 2H2O (l) The value of ƒ¢So for this reaction is __________ J/K.

    asked on August 1, 2010
  55. Science!

    CuCO3 + O2 -> CuO + CO2 hydrogen peroxide + manganese dioxide -> hydrogen + oxygen copper (II) sulfate pentahydrate + oxygen -> copper oxide + sulfur trioxide + dihydrogen monoxide What are the balanced queations for these?

    asked on September 28, 2009
  56. Chemistry

    Concentrated aqueous ammonia contains 1.00 mol NH3 dissolved in 2.44 mol H20. What is the mole fraction of NH3 in concentrated aqueous ammonia? What is the molal concentration of NH3

    asked on February 7, 2008
  57. chemistry

    Ca(NO 3 ) 2 + Na 2 CO 3 �� CaCO 3 + 2NaNO 3 net ionic equation?

    asked on April 22, 2020
  58. English

    1 When he awoke, it was three o’clock in the afternoon. He bounded up with a start; half of one of 2 his precious days gone already! He spent more than an hour in dressing, watching every stage of his 3 toilet carefully in the mirror. Everything was

    asked on January 31, 2018
  59. Physics

    A body of mass m falls from rest through the air. A drag force D = bv^2 opposes the the motion of the body. The acceleration due to gravity is g. A) What is the initial downward acceleration of the body? B) After some time the speed of the body approaches

    asked on February 6, 2016
  60. physics

    our charges are placed at the four corners of a square of side 15 cm. The charges on the upper left and right corners are +3 μC and -6 μC respectively. The charges on the lower left and right corners are -2.4 μC and -9 μC respectively. The net electric

    asked on July 28, 2015
  61. Organic Chemistry

    Draw every stereoisomer for 1-bromo-2-chloro-1,2-difluorocyclopentane. Use wedge-and-dash bonds for the substituent groups, and be sure that they are drawn on the outside of the ring, adjacent to each other.

    asked on March 19, 2014
  62. chemistry

    Complete and balance the precipitation reactions. Include physical states in your equations. Ba(NO3)2(aq) + CuSO4 (aq)---> K3PO4(aq)+MgCl2 (aq)---->

    asked on November 11, 2013
  63. Physics

    A series RCL circuit has a resonant frequency of 1500 Hz. When operating at a frequency other than 1500 Hz, the circuit has a capacitive reactance of 5.0 Ù and an inductive reactance of 30.0 Ù. What are the values of (a) L and (b) C? I know I should be

    asked on August 2, 2012
  64. Financial Accouting

    Prepare a 10-column work sheet for fiscal year 2005, starting with the unadjusted trial balance and including adjustments based on these additional facts: a. The supplies available at the end of fiscal year 2005 had a cost of $3,200. b. The cost of expired

    asked on May 27, 2012
  65. Physics

    The hypotenuse of a right triangle is 29.0 centimeters. The length of one of its legs is 20.0 centimeters. What is the length of the other leg?

    asked on February 22, 2012
  66. Algebra 1

    Let x be an integer. What is the product of twice the integer added to three times the next consecutive integer?

    asked on December 13, 2010
  67. Math analysis

    How do I simplify cscx-cotxcosx?

    asked on April 15, 2010
  68. Physics

    An electron enters a parallel plate apparatus 10.0cm long and 2.0cm wide, moving horizontally at 8.0 × 10^7 m/s. (top plate is positive, electron is 1.0cm from each plate..) The potential difference between the plates is 6.0 × 10^2 V. Calculate... (a)

    asked on February 26, 2010
  69. Chem

    Give the ideal bond angle for BrO3- ion? I know this has trigonal bipyramidal geometry and therefore the bond angle is < 109.5. Is there a way to determine a more specific bond angle?

    asked on February 12, 2010
  70. math

    a rectangular box with a volume of 60 ft^3 fas a square base. Find a funtion that models its surface area S in terms of the length x of one side of its base

    asked on November 8, 2008
  71. Chemisty

    What is the molecularity of each of the following elementary reactions? A. O+O2+N2----> O3+N2+ B. NO2Cl + Cl---> NO2 + Cl2 C. Cl + H2 ---> HCl + H D. CS2----> CS + S

    asked on February 17, 2008
  72. Chemistry

    Citric acid H3C6H5O7, occurs in plants. Lemons contain 5% to 8% citric acid by mass. The acid is added to beverages and candy. An aqueous solution is 0.688m citric acid. The density is 1.049 g/ml. What is the molar concentration?

    asked on February 7, 2008
  73. Chemistry

    How do you make CIF2 into a Lewis Structure

    asked on December 5, 2007
  74. Chemistry

    When 23.6 of calcium chloirde CaCl2 was dissolved in water in a calorimeter, the temperature rose from 25.0 degrees C to 21.56 degrees C. If the heat capacity of the solution and the calorimeter is 1071 J/ degrees C, what is the enthalpy change when 1 mol

    asked on November 1, 2007
  75. Chemistry

    In an experiment, you fill a heavy walled 5.00 L flask with methane gas, CH4. If the flask contains 7.13g of methane at 19 degrees C, what is the gas pressure. Use the ideal gas law. Can some one help me get started on this problem please

    asked on October 23, 2007
  76. writing

    Assume that a new employee is taking over your job because you have been promoted. Identify a specific problem in the job that could cause difficulty for the new employee. Assume that you will need to write instructions for the employee to help him or her

    asked on May 11, 2018
  77. Chemistry

    Write the net ionic equation for the following reaction : Na3SO4(aq) + Ba(NO3)2(aq) —> BaSO4 (s) + 2 NaNO3(aq)

    asked on December 10, 2017
  78. math

    Name the congruent angles and sides for the pair of congruent triangles. ∆MGB ≅ ∆WYT

    asked on November 4, 2017
  79. algebra

    a water rocket is launched with an initial velocity of 112ft/sec. its height h, in feet T seconds is given by the formula h=112T-16T^2. when will the rocket be exactly 192 ft above the ground? the rocket first reaches a height of 192ft after _____ and

    asked on December 5, 2015
  80. cultural diversity

    Which is NOT a strategy that can be implemented by a teacher to understand a family’s goals for his or her child’s linguistic development? A. The teacher can create a parent survey. B. The teacher can assume each family has the same goal for their

    asked on October 14, 2015
  81. chemistry

    Gaseous butane will react with gaseous oxygen to produce gaseous carbon dioxide and gaseous water . Suppose 29.1 g of butane is mixed with 64. g of oxygen. Calculate the minimum mass of butane that could be left over by the chemical reaction. Be sure your

    asked on September 16, 2015
  82. Math

    There are two integers from 1 through 40 and are chosen by a random number generator. Write the final answer in a/b form. 1.) P(the same number is chosen twice) 2.) P(both numbers are less than 30) 3.) P(one number is even and one number is odd) 4.) P(both

    asked on April 28, 2015
  83. physics

    A light, inextensible cord passes over a light, frictionless pulley with a radius of 11 cm. It has a(n) 14 kg mass on the left and a(n) 4.3 kg mass on the right, both hanging freely. Initially their center of masses are a vertical distance 2.1 m apart. The

    asked on July 7, 2014
  84. geometry

    What is the altitude of a rhombus if its area is 50 square meters and the length on one side is 12.5 meters? A. 10 m B. 4 m C. 7.5 m D. 12.5 m

    asked on November 17, 2013
  85. Physics

    if pressure inside a cylinder with a circular hatch is 2 atm and the radius of the entrance hatch is 12 inches, what force does the air exert on the hatch? i cannot figure out if it would be 13,300.6 lb 24 lb 288 lb 1,300.6 lb or 904.8 lb

    asked on October 1, 2012
  86. Physics

    A spring whose spring constant is 650 N/m is compressed 0.600 m. What speed (in meters/second) can it give to a 0.100 kg ball when released

    asked on July 2, 2012
  87. Calculus

    an open top box is to be made by cutting congruent squares of side length x from the corners of a 12 by 15 inch sheet of tin and bending up the sides. how large should the squares be? what is the resulting maximum value?

    asked on February 28, 2011
  88. Trigonometry

    How do I find the value of sin(a-b) if tana=4/3, cotb=5/12, 0

    asked on April 15, 2010
  89. Chemistry

    how do you write a chemical equation with this reaction? can u help me solve these 1.Liquid carbon disulfide reacts with oxygen gas, producing carbon dioxide gas and sulfur dioxdie gas. 2. Solid zinc and aqueous hydrogen sulfate reacts to produce hydrogen

    asked on January 26, 2009
  90. Chemistry

    NaCl crystallizes in face-centered cubic cell. what is the total number of ions(Na+ ions and Cr- ions) that lie withing a unit cell of NaCl? 2 4 8 6 5

    asked on February 6, 2008
  91. Chemistry

    Liquid Butane, C4H10, is stored in cylinders to be used as a fuel. Suppose 39.3g of butane gas is removed from a cylinder. How much heat must be provided to vaporize this much gas? The heat of vaporization of butane is 21.3 kJ/mol.

    asked on January 31, 2008
  92. Chemistry

    The principal quantum number of the valence electrons in a atom of lead is A. 2 B. 3 C. 4 D. 5 E. 6

    asked on November 18, 2007
  93. Chemistry

    What is the de Broglie wavelength of an oxygen molecule, O2 traveling at 521 m/s? Is the wavelength much smaller or much larger than the diameter of an atom. (on the order of 100 pm) De Broglie wavelength = h/mv h = Planck's constant in J*s. m is mass in

    asked on November 3, 2007
  94. Chem

    Calculate the frequency associated with light of wavelength 656nm. (this corresponds to one of the wavelengths of light emitted by the hydrogen atom.)

    asked on November 1, 2007
  95. Chemistry

    Magnesium metal reacts with hydrochloric acid to produce hydrogen gas H2 Mg + 2HCl ----> MgCl + H2 Calculate the volume (in liters) of hydrogen produced at 33 degrees C and 665 mmHg from 0.0840 mol Mg and excess HCl P= .875 atm V= ? n= .0840 mol R= 0.0821

    asked on October 23, 2007
  96. sci

    Suppose you are in charge of planning a forest reserve, and one of your main goals is to help sustain locally beleaguered populations of woodland birds. Parasitism by the brown-headed cowbird is an escalating problem in the area. Reading research reports,

    asked on August 22, 2007
  97. chemistry

    calculate the empirical formula: 79.8%C and 20.2%H. what os the formula Take a 100 g sample. That will give you 79.8 g C 20.2 g H. convert g to mols. mols = g/molar mass. 79.8/12.01 = 6.64 20.2/1 = 20.2 This gives the formula of C6.64H20.2 However, we know

    asked on March 31, 2007
  98. English

    The following is an example of regional dialect from which author? "The feller took the money and started away; and when he was going out at the door, he sorter jerked his thumb over his shoulder­­so­­at Dan'l, and says again, very deliberate, 'Well,'

    asked on January 31, 2018
  99. Chemistry

    Acid-Base Titrations These are fill in the blank and I really am not sure what the answers are 1. Indicators change color over a range that is called its ---? 2. The common indicator ---? is very useful in studying neutralizations that involve strong acids

    asked on December 17, 2017
  100. English

    Which of the following sentences contains an error in subject-verb agreement? A. Either Dennis or Susan is going to pick you up. B. Each of the 14 groups are going to contribute an item to the auction. C. Kristy, Molly, and Kate attend the same university

    asked on April 7, 2015

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