1. Chemistry

    Colligative Properties The freezing point of distilled water was determined by recording a thermogram: -0.176 degrees Celsius. The freezing point of a 0.200 m (molality) solution containing an unknown, ionic compound was determined by recording a second thermogram: -.904 ...
  2. chemistry

    Consider the following multistep reaction: C+D-> <-CB (FAST) CD+D->CD2 (SLOW) CD2+D->CD3 (FAST) C+3D->CD3 (OVERALL) Based on the mechanism determine the rate law for the overall reaction??
  3. Chemistry

    A reaction has delta H_rxn= -125 kJ and delta S_rxn= 324 J/K. At what temperature is the change in entropy for the reaction equal to the change in entropy for the surroundings?
  4. chemistry

    Reaction: Na2CO3 + 2 HCl -> 2 NaCl + CO2 + H2o How many grams of NaCl can be produced from the reaction of 1.35g of Na2CO3 with 125mL of 0.265 M HCl?
  5. Chemistry

    In the reaction: MnO2 + 4 HCl ---> MnCl2 + Cl2 + 2 H2O Calculate: The volume of Cl2 produced from the reaction of 10 grams of HCl with excess MnO2?
  6. chemistry

    is this true or false? i think its false because isnt it spontaneous if its positive When (triangle i think its called delta) H for a reaction is large and positive, the reaction is not expected to be spontaneous.
  7. OChem

    Could someone explain these two reaction mechanisms (I know they are substitution): 1) 1-propanol reacted with H2SO4 and NaBr 2) 2-pentanol reacted with H2SO4 and NaBr does the carbocation rearrange for the second reaction? thanks for the help!
  8. Science

    I don't understand this question... Which side of the chemical equation would energy be located on in an endothermic reaction? I understand that in an endothermic reaction it absorbes energy.
  9. chem

    3. Given a chemical reaction and H associated with the reaction: stoichiometry and limiting reactant problem involving gases. Why would we need delta H for a stoichimetry or limiting reactant problem? And can i get an example pleasE?
  10. statistics

    The reaction time of subjects to a certain psychological experiment is considered to be normally distributed with a mean of 20 seconds and a standard deviation of 4 seconds. What is the reaction time such that only 10% of subjects are faster?
  11. statistics

    The reaction time of subjects to a certain psychological experiment is considered to be normally distributed with a mean of 20 seconds and a standard deviation of 4 seconds. What is the reaction time such that only 10% of subjects are faster?
  12. Chemistry II

    The following general reaction was found to be first-order with respect to A and second-order with respect to B: A + B ---> products What would the rate of this reaction be in terms of k in a one liter vessel containing 4 moles of A and 7 moles of B?
  13. science

    A mixture of hydrogen gas and oxygen gas are ignited and the following reaction occurs: Hydrogen + Oxygen = Water + Energy. Is this an Endothermic or Exothermic reaction and why?
  14. Chemistry

    I’m trying to precipitate out FePO4. Following the reaction: H3PO4 + FeCl3 = FePO4(s) + 3HCl I reacted phosphoric acid to ferric chloride, and according to the reaction, there should be a precipitate. But I haven’t observed a precipitate for the last 3 hours. Is there a ...
  15. chemistry Please Help Dr.BOB

    Complete hydrolysis of 25 mM ethyl acetate in an enzyme (i.e., esterase)-catalyzed reaction is carried out in a 40 mM NaCl solution buffered by 0.2 M Tris-Cl, pH 9.1. What is the pH at the end of the reaction? (For Tris base, which is the abbreviation for Tris (hydroxymethyl) ...
  16. Jade

    1. Spectroscopic studies of the reaction of azide ion with the cluster [Ru3(CO)12] in acetone solvent confirmed the occurrence of process (i) under a CO atmosphere. Kinetic measurements of this rapid [Ru3(CO)12]+ N3– →[Ru3(NCO)(CO)11]–+ N2(i) reaction revealed the ...
  17. Chemistry Help

    1. Spectroscopic studies of the reaction of azide ion with the cluster [Ru3(CO)12] in acetone solvent confirmed the occurrence of process (i) under a CO atmosphere. Kinetic measurements of this rapid [Ru3(CO)12]+ N3– →[Ru3(NCO)(CO)11]–+ N2(i) reaction revealed the ...
  18. chemistry - kinetics

    Understanding the high-temperature behavior of nitrogen oxides is essential for controlling pollution generated in automobile engines. The decomposition of nitric oxide (NO) to N2 and O2 is second order with a rate constant of 0.0796 M−1*s−1 at 737∘C and 0....
  19. Chemistry

    Consider the reaction: CaCl2. 2H2O(s) <=> CaCl2(s) + 2H2O(g) The equilibrium constant for the reaction as written is
  20. chemistry

    The rate of formation of C in the reaction 2 A + B ----> 3 C + 2 D is 2.2 mol/L.s. Calculate the rates of reaction of A and B, and the rate of formation of D.
  21. Chemsitry

    If Kc = 6.38 × 105 for the reaction A(g) ⇀ ↽ 2B(g), what is Kc for the reaction written as 2B(g) ⇀ ↽ A(g)? How would I solve this?
  22. English

    Write a sentence that matches the form provided in the description (Sentence with compound subject and action verb.) My Sentence is : The lizard and the cat jumped on the mouse. Now i need a second sentence to match my first sentence (Sentence with a proper noun and a linking ...
  23. CHEMISTRY HELP!!!!!!!!

    How many grams of KCl are produced by the thermal decomposition of KClO3 that produces 25mL of O2 at 25 degrees and at 1 atm? A)0.0508 B)0.0762 C)0.0835 D)0.125 what is the anwser and what equation would i use to get the anwser? Write the balanced equation for the ...
  24. Chemistry

    Hi can someone please help with this question, or atlest direct me in the right direction. Please and thank you. The initial rate of reaction H2O2(aq) --> H2O (l) + 1/2 O2(g) is found to be1.7*10^-3 M/s . Assume that this rate holds for 2 minutes. Start with 165ml of 1.55M ...
  25. Chemistry

    If you could me solve ths is anyway, it would be much appreciated. A solution containing 3.50g of sodium carbonate is mixed with one that contains 5.00g of silver nitrate. a. Write the complete chemical equation and the net ionic equation for the reaction that occurs. b. What ...
  26. Chemistry

    a student uses the unduiluted glucose stock solution in a reaction and finds that the absorbance values over 90 seceonds are all 1.900. What does this result tell you abou the enzyme activity of glucose oxidase in this reaction after the 90 seconds time point? Would it be ...
  27. Chemistry

    If you could me solve ths is anyway, it would be much appreciated. A solution containing 3.50g of sodium carbonate is mixed with one that contains 5.00g of silver nitrate. a. Write the complete chemical equation and the net ionic equation for the reaction that occurs. b. What ...
  28. Chemistry

    I need chemistry help. I think 1. c, 2.b, & 3.a (please tell me why or why not and help me set up the problems if possible) 1.) The following half reaction has been balanced except for the electrons. How many and where should the electrons be included? 14 H+(aq) + Cr2O72-(aq...
  29. MATH-too confusing :(

    Last fall, a gardener planted 64 iris bulbs. She found that only 56 of the bulbs bloomed in the spring. a.) Find the empirical probability that an iris bulb of this type will bloom. Give answer as a fraction in lowest terms. b.) How many of the bulbs should she plant next fall...
  30. chemistry

    A classic experiment in equilibrium studies dating from 1862 involved the reaction in solution of ethanol and acetic acid to produce ethyl acetate and water. The reaction can be followed by analyzing the equilibrium mixture for its acetic acid content. In one experiment, a ...
  31. Chemistry

    I want to know the enthalpy change for this reaction which occurs in a blast furnace: Fe2O3(s) + 3C(s) --> 2Fe(l) + 3CO(g) You will need the heat of formation for CO, and ironIIIoxide, and the heatofmelting for iron. I suspect you have some temperature in mind also which ...
  32. organic chemistry

    Michael & Aldol Condensation Reaction We are preparing an a,b-unsaturated ketone via Michael and aldol condensation reactions. The reactants are trans-chalcone and ethyl acetoacetate (in ethanol and NaOH). This creates 6-ethoxycarbonyl-3,5-diphenyl-2-cyclohexenone. What I'm ...
  33. organic chemistry

    Michael & Aldol Condensation Reaction We are preparing an a,b-unsaturated ketone via Michael and aldol condensation reactions. The reactants are trans-chalcone and ethyl acetoacetate (in ethanol and NaOH). This creates 6-ethoxycarbonyl-3,5-diphenyl-2-cyclohexenone. What I'm ...
  34. organic chemistry

    Michael & Aldol Condensation Reaction We are preparing an a,b-unsaturated ketone via Michael and aldol condensation reactions. The reactants are trans-chalcone and ethyl acetoacetate (in ethanol and NaOH). This creates 6-ethoxycarbonyl-3,5-diphenyl-2-cyclohexenone. What I'm ...
  35. chemistry

    how do i name the ionic compound bythis formula (NH4)2Cr2O7
  36. algebra

    Solve the compound inequality graph solution-2<2x-4<4 answers are 0<x<-2, 3<x<6, 1<x<4, 1<x<0
  37. chemistry

    what is the total number of atoms in the compound (NH4)3PO4?
  38. Chemistry

    why are most elements on the periodic table found as compound in nature?
  39. English

    I can't unscramble this word it is a compound or a collective noun it is afsedrniru
  40. Science

    How do you prepare 500mL of a 2.5M solution of NaOH from the solid compound?
  41. chem

    Which compound has a higher boiling point and why? a. PF3 b. PF5
  42. science

    Name the ionic compound form when a Magnesium reacts with chlorine?
  43. science

    what compound is formed if you combine iron, sulphur and oxygen?
  44. algebra

    Solve the compound inequality graph solution 6x-4<-34 or3x+10>10
  45. Chemistry

    which compound shows small change in solubility from 0°C to 100°C?
  46. Chemistry

    Identify the compound and classify its functional group in the image H H H H H H H-C-C-C-O-C-C-C-H H H H H H H
  47. Chem

    Does Organic compound have weak or strong intermolecular forces?
  48. chemistry

    whats the oxidation number for all the elements in the following compound BaNaPO4
  49. Science

    Why is water only compound occuring naturally on earth in three states?
  50. organic chemistry

    what is this compound, it has a mf of c6h12o i. imgur. com/gCgw0Hi. png
  51. Organic Chemistry

    Do these two names refer to the same compound: N-butylcyclohexylamine vs N-butylcyclohexanamine?
  52. Chemistry

    If you were given 0.021 milligrams of the compound,H3PO4, what would the mass of H in the sample be?
  53. Chemistry

    what are 1 or 2 causes of loss of product that you may observe when synthesising a coordination compound
  54. Chemistry

    what is the gram molecular mass of the compound with the formula CH3COOH ? (1)22.4 g (2)44.0 g (3)48.0 g (4)60.0 g
  55. chemistry

    A dead alkaline battery is found to contain a compound of Mn and O. It's analysis gives 69.6% Mn and 30.4% O
  56. chemistry

    the correct formula for the ionic compound containing Tl^3+ and Te^2- ions would be: Please show. thank you
  57. science

    it has at lease one meal and one nonmetal element. compound salt
  58. grammar

    identify simple complete and compound subject and predicate
  59. english pronouns

    Using correct pronoun in compound sentence. Were you and (they, them)the winners?
  60. science

    Ddraw an electron dot structure for a compound of fluorine and Z?
  61. Chemistry

    A compound contains 84% carbon and 10% hydrogen.find the emperical formula.
  62. Chemistry

    The Ksp of tin(II) hydroxide, Sn(OH)2, is 5.45 × 10-27. Calculate the solubility of this compound in g/L.
  63. english MS.sue help please

    Which of these is a compound noun? flashlight*** birds butter am i right
  64. science

    Calculate the mass percent composition of each element in each compound.
  65. Science-Chemistry

    What compound is made when sodium is burned in air
  66. Chemistry

    The Ksp of tin(II) hydroxide, Sn(OH)2, is 5.45 × 10-27. Calculate the solubility of this compound in g/L.
  67. Chemistry

    Write the formula for each Ionic compound. *barium nitrate
  68. Chemistry

    What physical properties will the ionic compound CaSO4 be expected to have?
  69. Chemistry

    Why would Magnesium (Mg) be unable to combine with Chlorine (Cl) to make a compound?
  70. Physical sciences

    Name of the following compound:KBr, Na2CO3 ,FeSO4, CrCl3
  71. Chemistry

    Can anyone please tell me what can you say about the purity of the compound extracted based on your TLC results? Thanks
  72. Chemistry

    he Ksp of mercury(II) hydroxide, Hg(OH)2, is 3.60 × 10-26. Calculate the solubility of this compound in g/L. I came up with x=2.8*10^-13
  73. ENGLISH

    WE'LL, WON'T... WHAT IS THE PROPER PHRASE FOR THESE WORDS? IS IT A COMPOUND WORD?
  74. Chemistry

    The Ksp of manganese(II) hydroxide, Mn(OH)2, is 2.00 × 10-13. Calculate the solubility of this compound in g/L.
  75. science

    how to find if a compound e.g.CH3CN acts both as a nucleophile and an electrophile
  76. physical science

    What is a compound that has water chemically attached to its ions?
  77. Chemistry

    In fluorescence, why do we have to preapre a calibaration curve for every compound in our sample?
  78. Chemistry

    In fluorescence, why do we have to preapre a calibaration curve for every compound in our sample?
  79. science

    are substances either elements or mixtures????????/ a substance is an element, or compound.
  80. Physical Science

    What is the name of the binary compound formed from potassium and iodine?
  81. MAT 221

    -10 < -2 + 8x < 22 4x + 7 < 11 or 1 ¨C x ¡Ü -2 Please help me solve these compound inequalities. Any instruction would be appreciated.
  82. English

    Is The dog followed the rabbit when it jumped into the bushes. a compound sentence?
  83. chemistry

    Determine a compound that will precipitate the (Hg2)^2+ in Hg2X2(soluble).
  84. Algebra

    What do I do if a compound inequality contradicts itself? Do I put down empty set, or what?
  85. Algebra2

    Find the functional values f(-5), f(1), and f(3) for the compound function. 1. f(x)= |x-5| if x≤1 ; (1)/(x+1) if x>1
  86. Algebra

    Write the solution in interval notation x<5 and x>=-2. ) What would the compound inequality look like? Thanks for the help!
  87. trig

    Expan each of the following using the compound-angle formulae:sin(x + 20degree)
  88. Chemistry

    How to predict the possible structures of a compound if the degree of unsaturation of it is in fraction?
  89. chemistry

    when you burn ionic and covalent compound using Bunsen burner,what you will see?
  90. math

    How many formula units of the compound are present in 5.7g of Epson salt?
  91. chemistry

    What quantity of solid compound? 300ml of 4% (w/v) ammonium chloride.
  92. Chemistry

    The percentage composition of chlorine, by mass, in the compound K2PtCl4 is
  93. Algebra2

    Find the functional values f(-5), f(1), and f(3) for the compound function. 1. f(x)=|x-5| if x≤1 ; (1)/ (x+1) if x>1
  94. Chemistry

    Indicate how many stereoisomers are possible for each compound. b) tetrahedral [NiCl2Br2]2– c) octahedral [Fe(CO)4BrCl]
  95. Chemistry

    What happens when an electric current is passed through a solution of an ionic compound?
  96. biologgyy HELP ME!

    what compound is formed from carbon dioxide in the calvin cycle?
  97. PELAGIE

    what is the time necessary for 99.9%of the atoms of a radioactive compound to be disintegrated? t½=5times.
  98. chemistry

    What is the formula for the compound formed when potassium reacts with nitrogen?
  99. Chemistry

    Since we say that sand is silicon dioxide,it is considered a compound and not a mixture?
  100. chemistry

    What is the percentage of water to the nearest tenth in this compound?Ba(OH)2*8H2O
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