1. chem

    "The percentage of sodium hydrogen carbonate, NaHCO3, in a powder for stomach upsets is found by titrating .275 M hydrochloric acid. if 15.5 mL of hydrochloric acid is required to react with .500 g of the sample, what is the percentage of sodium hydrogen
  2. chemistry

    Write the equation for the reaction, if any, that occurs when each of the following experiments is performed under standard conditions. a) crystals of iodine are added to an aqueous solution of potassium bromide. b) liquid bromine is added to an aqueous
  3. Algebra

    Glen created a mural on a rectangular sheet of paper with a width of √18 feet and a length of √24. A. Find the exact area of the mural, in simplified form. When Glen’s mural was unveiled, the school made a smaller version of the mural to
  4. Chemistry(Please check answers)

    1) For a reaction delta Go is more negative than delta Ho. What does this mean? a. delta So is zero. b. delta So is negative c. delta So is positive d. delta So is negative if delta Ho is positive. e. delta So is negative if delta Ho is negative. I think
  5. Math

    Name the property that justifies each step. [(2x100)+(3x10)]+[(1x100)+(5x10)] = (2x100)=[(3x10)+(1x100)]+(5x10) I think this is Commutative = (2x100)+[(1x100)+(3x10)]+(5x10) I think this is Distributive property =[(2x100)+(1x100)]+[(3x10)+(5x10)] I think
  6. math,correction

    Find length x in each triangle. Express your answer in simplified radical form. leg 1 = 8 leg 2 = x hypotenuse = 12 MY answer: so x = ã80 I got √80 or appr. 8.94 yes the symbol is a radical. also since the directions say to leave as a radical form
  7. Math

    How do I Write the equation to find the slope of a line? Write the point-slope form of the equation of a line? Write the slope-intercept form of the equation of a line?
  8. ChemistryDrBob222

    Arrows disappeared from below added them back to the equations. ??(a) I don't understand ln(No/N)=akt The decomposition of IBr(g)into I2 (g) and Br2 (g) is first order in IBr with k = 0.00255/sec. (a)Starting with [IBr] = 1.50M, what will [IBr] become
  9. Organic chemistry!!!Need helpp!!!

    1. Consider the effect of water concentration on rate of the reaction in water and acetone. WOuld you predict that the rate would be greater or less in the presence of a higher concentration of water? Explain your answer, using the structure of the
  10. Organic chemistry!!!Need helpp!!!

    1. Consider the effect of water concentration on rate of the reaction in water and acetone. WOuld you predict that the rate would be greater or less in the presence of a higher concentration of water? Explain your answer, using the structure of the
  11. English

    Which of the following are characteristic of the growth of realism? An embracing of the ideals but not the methodology of later romanticism, a focus upon the lower classes, and a "slice of life" approach A reaction against romanticism, a reaction against
  12. Algebra

    Suppose someone opens the valve on a large water tank so that water drains out. Choose a starting volume of water in the tank (from 100 to 500 gallons), and choose how much water drains out each day (from 2 to 5 gallons). Write the equation that models the
  13. History

    Which option accurately describes the impact the Columbian Exchange had on the indigenous people of the Americas? A. The Columbian Exchange enabled the trade of the coca plant, which was later made into an early form of cocaine. B. Europeans brought
  14. History

    Which option accurately describes the impact the Columbian Exchange had on the indigenous people of the Americas? A. The Columbian Exchange was a barter system between European explorers and the indigenous people, who exchanged gold for rum and spices. B.
  15. Math plz help me!!! URGENT!!

    1. Write the ratio in the simplest form. 16:24 (1 point) 1:2 4:3 3:4 2:3 2. Solve the following proportion. (1 point) p = 2 p = 8 p = 12 p = 24 3. A recipe calls for 2 cups of sugar to make 2 dozen cookies. Use the proportion to calculate how much sugar is
  16. Math I NEEEDDDD HELP PLEASEEEEE

    1. Write the ratio in the simplest form. 16:24 (1 point) 1:2 4:3 3:4 2:3 2. Solve the following proportion. (1 point) p = 2 p = 8 p = 12 p = 24 3. A recipe calls for 2 cups of sugar to make 2 dozen cookies. Use the proportion to calculate how much sugar is
  17. Urgent Spanish Check

    A) Read the following sentence and choose which word is not correct in the context of the sentence. 1) La examen es difícil. La? 2) El árbol es verdes. el? B) The following sentence is written in singular form. Read the sentence, then choose the correct
  18. chemistry

    22.0 ammonium chloride decomposes to form hydrochloric acid, and ammonia. at the conclusion of the reaction, the scientist collects 10.24L of ammounia measured at 52 degrees Celsuis and 105.3 kPa. What was the percent yield of the reaction? Write the
  19. Chemistry

    This question is really making me upset i just can't get the answer right. i've tried so many times. If someone could help it would be muchly appeciated! Experiments were performed with four metals and solutions of their ions: A-A, B-B2+, C-C2+, D-D2+. the
  20. chemistry

    In one experiment, the reaction of 1.00 g mercury and an excess of sulfur yielded 1.16 g of a sulfide of mercury as the sole product. In a second experiment, the same sulfide was produced in the reaction of 1.52g mercury and 1.02g sulfur. a) What mass of
  21. *Chemistry

    Hydrogen reacts w/ sodium to produce solid sodium hydride, NaH. A reaction mixture contains 6.75 g Na and 3.03 g H2. A. Which reactant is limiting? B. What is the theoretical yield of NaH from the above reaction mixture? C. What is the percent yield if 4 g
  22. chemistry - PLEASE HELP

    Spectroscopic studies have shown that the fusion reaction in the sun's core proceeds by a complicated mechanism. One proposed overall equation for the solar fusion reaction is 411H+2 0−1e→42He which is also accompanied by the release of
  23. chemistry

    Use the following information to identify element A and compound B, then answer questions a and b. An empty glass container has a mass of 658.572 g. It has a mass of 659.452 g after it has been filled with nitrogen gas at a pressure of 790. torr and a
  24. Chemistry

    X(g) + 2 Y(g) + 2 Z(g) -->3 M(g) + 2 N(g) I've already found the orders for the following to be: X is 2nd, Y is 1st, Z is 0 and overall of course is 3. But I am confused about the below question. I initially guess that No it doens't occur in one
  25. simplest form

    6 8
  26. Factored Form

    Does 7r-7= 7r 7 This has to be in factored form. please let me know
  27. MA

    Can a/b and (a+b)/b ever form a proportion? Why or why not?
  28. simplest form

    what is 1/2+5/6 in simplest form
  29. engineering

    what is the SI form A)MN/ks^2 B)kN/ms
  30. math

    4.10:1.90 in the form of n:1
  31. simplest form

    what is the simplest form of 1/4?
  32. quadratic

    what is -x^2+4=(3x-1)^2 in the form ax^2+bx+c=0
  33. physics

    Tarzan, who weighs 780 N, swings from a cliff at the end of a 12.0 m vine that hangs from a high tree limb and initially makes an angle of 49.0° with the vertical. Assume that an x axis extends horizontally away from the cliff edge and a y axis extends
  34. Chemistry

    For the following electrochemical cell, what is the correct, balanced reaction? Cu(s) | Cu2+(aq) || Ag+(aq) | Ag(s) A. Cu(s) + Cu2+(aq) → Ag+(aq) + Ag(s) B. Cu(s) + Ag+(aq) → Cu2+(aq) + Ag(s) C. Cu(s) + 2 Ag+(aq) → Cu2+(aq) + 2 Ag(s) D.
  35. Chemistry

    A student conducts an experiment to determine the enthalpy of neutralization for phosphoric acid reacting with sodium hydroxide. The student combines 25.0 mL of equimolar solutions of acid and base, both having an initial temperature of 22.5 °C, in an
  36. Chemistry

    A student conducts an experiment to determine the enthalpy of neutralization for phosphoric acid reacting with sodium hydroxide. The student combines 25.0 mL of equimolar solutions of acid and base, both having an initial temperature of 22.5 °C, in an
  37. AP Chem

    2) For a theoretical yield of 19 g and actual yield of 11 g, calculate the percent yield for a chemical reaction. Answer in units of %. 11 g / 19 g times 100 = 57.89% in your 2 sigfig problem, you might be expected to round off to 58%
  38. chemistry

    are this 2 equations the same NIE? and if not how come? Write a net ionic equation for the reaction that occurs when aqueous solutions of ammonia and acetic acid are combined. Write a net ionic equation for the reaction that occurs when aqueous solutions
  39. Chemistry-DrBob222

    Arrows disappeared from below added them back to the equations. ??(a) I don't understand ln(No/N)=akt Is (a) -3.77 The decomposition of IBr(g)into I2 (g) and Br2 (g) is first order in IBr with k = 0.00255/sec. (a)Starting with [IBr] = 1.50M, what will
  40. French 1

    I have to translate the following into French with an object pronoun. Can you please check for me. Thanks!!! 1.Show us the main course! 2.I’m lending some sugar to him 3.They (femine form) owe me a cake 4.Tell them his name!( use vous form) 5.I don’t
  41. Art

    I am suppose to look at the sculpture Madonna and Child within an Arch by Donatello. I am suppose to say what elements of art are used in this sculpture. The elements of art in case you don't know are form texture color shape line and value. I said this
  42. Calculus

    The owner of a farm wants to form four rectangular corrals. He has 750 meters of iron gate to enclose and to separate the four corrals. To save materials, he he decides to enclose a large area and to divide into four rectangles. Divide them will use part
  43. Albebra

    Find the vertex of the function y = –x2 + 2x + 8. It is where the derivative -2x + 2 = 0. Since you probably haven't learned about derivatives, do it this way: Rewrite is as -x^2 +2x +8 = -(x-1)^2 + 7 Now look at the form of the formula on the right. It
  44. Ochem

    The following question is due to a reaction in organic chemistry ethanol from sucrose. I did not properly state in my last post where the reaction came from. I apologize for this (Dr.Bob). I repost the same question: Calculate how many milliliters of
  45. Spanish

    This is my assignment: Imagine you are babysitting your little brother. Write a total of 5 Spanish sentences using tú commands telling your little brother what to do. Write 3 sentences using regular verbs. Write 2 sentences using irregular verbs. You can
  46. Algebra

    1. (2x-6)/(21) divided by (5x-15)/(12) 2. Solve (x)/(x-9)-4=(9)/(x-9)..I got -6, is that correct? 3. Add. Express your answer in simplest form...(4)/(s)+(6)/(s^2).. 4. Add. Express your answer in simplest form...(x^2)/(x+4)+(8x+16)/(x+4) Lets check you
  47. Ms. Sue PLZ HELP!!!(Civics)

    "Four score and seven years ago our fathers brought forth on this continent, a new nation, continent in Liberty, and dedicated to the preposition that all men are created equal." -Abraham Lincoln With which of the following statements is the author of the
  48. Chemistry

    Ranking equilibrium constants from largest to smallest according to an image?Ethene (C2H4) can be halogenated by the following reaction: C2H4 (g) + X2 (g) -><- C2H4X2 (g) where X2 can be Cl2 (green), Br2 (brown), or I2 (purple). Examine the three
  49. chemistry

    Nitrogen gas, N2, is usually a very inert gas and thus, is often employed in dry boxes. However, it would be a poor choice for use in a dry cell with which of the following substances? A) uranium metal B) Cu/Sn alloys C) Li metals D) Ca metals E) none of
  50. Chem II

    2.5 mol NOCl(g) was placed in a 2.50 L reaction vessel at 400 degrees C. After equilibrium was established, it was found that 28% of the NOCl had dissociated according to the equation: 2NOCl(g)<-->2NO(g)+Cl2(g) Calculate the equilibrium constant, Kc,
  51. science

    writing balanced chemical reaction of K2CO3 (s) with HCl (aq)??
  52. biology

    Describe the to type of energy changes that can occur in a chemical reaction Thanks
  53. English

    Contrat the reaction of Hamlet, Laertes to their father's death.
  54. chemistry again

    how do you find the concentration of an ion remaining after a reaction is complete???
  55. SCIENCE

    CO+H2O ---->CO2+H2 IN THIS REACTION HOW TO I HAVE TO CANAVART CARBONIC ACID?
  56. Chemistry

    How much reaction is complete when Kc=1, options: a.10% b.25% c.50% d.100% please explain the answer
  57. Science

    Is this statement true or false? An antigen causes an allergic reaction. Please and thank you!
  58. Chemistry

    For the following fusion reaction, calculate the change in energy per mole. 2/1 H + 3/2 He -> 4/2 He + 1/1 H
  59. Chemistry

    For the following fusion reaction, calculate the change in energy per mole. 2/1 H + 3/2 He -> 4/2 He + 1/1 H
  60. chem 2

    calculate kc for reaction I2 (g)+Cl2 (g)⇌2ICl(g )Kp=81.9 (at 298 K)
  61. Chemistry

    Hello, Is there a reaction when NaNO3 is added to some H2O? Or does it just dissolves? Please explain why, thanks!
  62. General chemistry i

    Is this a redox reaction? 4Cr+3O2 -> 2Cr2O3
  63. chemisrty

    What is ΔGo at 1000 oC for the following reaction? CaCO3 (s) CaO (s) + CO2 (g)
  64. chemistry (ap)

    What will be the reaction rate (formation of C) when the concentrations of A & B are 0.150 M and 0.250 M respectively?
  65. Chemistry

    what type of reaction occurs in Al+SnCl4 ? and what is the balanced equation
  66. Chemistry

    Calculate Kp at 298K for the reaction SO2 + NO2--->SO3 + NO
  67. AP Chemistry

    What effect would a catalyst have on the rate of reaction for the decomposition of ozone?
  68. Chemistry

    Please help, do you have any pointers on how to use linear regression in determining the reaction order
  69. Science

    Write a mechanism for the aldol reaction of 3,3-dimethyl-2-butanone.
  70. Chemistry

    how can magnesium chloride be lost in a reaction and how can we ensure that it is pure?
  71. science

    Is an icing propane regulator concidered an endothermic reaction?
  72. chemistry

    How to solve CoCl2+HO2- ------> Co(OH)3+ Cl- by half reaction method
  73. science

    when a liquid wax is turned into a solid is it a chemical reaction?
  74. Chemistry

    Classify each reaction and balance the equations. Al(OH)3 ==> Al2O3 + H2O
  75. science

    Write an equation to show reaction of pop with water
  76. Organic Chemistry

    The reaction of (Z)-butenedioic acid with 1,3-cyclopentadiene gives only one product. Why?
  77. chemistry

    what amount of ethanol is needed for combustion reaction for a 20 oz bottle?
  78. Chemistry

    Write the Kc expression for the following reaction: Fe3+ + SCN- = FeSCN2+
  79. Chemistry

    Writing balanced chemical reaction of K2CO3 (s) and HCl (aq) ???
  80. PHYSICS

    What reaction occurs between hydrogen and helium which gives the heat and of the sun
  81. CHEMISTRY

    What will be the reaction rate (formation of C) when the concentrations of A & B are 0.150 M and 0.250 M respectively?
  82. chemistry

    the reaction with ammonium hydroxide with the following metals: Fe3+ Mn2+
  83. chemistry

    Determine the delta H for the following reaction C3H4(g) + 2H2(g) --> C3H8(g)
  84. chemistry

    what mass of excess reactant remians when the reaction is completed?
  85. Chemistry

    How many grams of Ni(OH)2 are produced from the reaction of 45.0mL of 1.75 M NaOH solution?
  86. chemistry

    When 24.2 kg of Fe2O3 react with 14.5 kg of CO and 5.4 kg of Fe are recovered, what is the percent yield for the reaction?
  87. chem

    What does it mean when the sulfuric acid in a chemical reaction is written ABOVE the arrow?
  88. chemastrey

    of exhow many grams of no2 can be produced by the reaction of excess o2 with 19.8 of no
  89. chemistry

    what is the source of activation energy in an exothermic reaction? Is an example heat?
  90. Chemistry

    Write the equation for the reaction of mixing 2 ml of 3 M (HO)2SO2 with 9 ml of 0.2 M NaClO4
  91. chemistry

    what is the chemical reaction of camphor and coca cola drink
  92. Chemistry

    Write the equation for the reaction of mixing 2 ml of 3 M (HO)2SO2 with 9 ml of 0.2 M NaClO4
  93. chemistry

    write the equation for the reaction of mixing 4 ml of 3 M (ho)2so2 with 7 ml of 0.2 M naclo4
  94. Physics

    What is the energy released in the fusion reaction: 2H+2H--> 4He + Q? How do I calculate this?
  95. chemistry

    how does an increase in pressure affect the following reaction? C2H2(g)+H2(g) C2H4(g)
  96. Science PLEASE HELP ASAP

    Why is photosynthesis an example of a chemical reaction, and why is it classified as endothermic?
  97. chemistry

    equation of the reaction of hydrochloric acid and iron sulphide
  98. chemistry

    briefly explain how to demostrate that all the reactants in a neutralization reaction has been used up
  99. chemistry

    Consider the reaction, 4 NH3 + 5 O2 => 4 NO + 6 H2O How many grams of NO will be made from 10.7 moles of O2?
  100. chemistry

    C+HNO3=H2CO3+H2O+NO2 which type of reaction is it.