1. chemistry

    When 0.627 g of Ca metal is added to 200.0 mL of 0.500 M HCl(aq), a temperature increase of 102C is observed. Assume the solution's final volume is 200.0 mL, the density is 1.00 g/mL, and the heat capacity is 4.184 J/gC. The molar heat of reaction, H rxn,
  2. chemistry

    A coffee-cup calorimeter is filled with 50 mL of 1 M NaOH and 50 mL of 1 M HCl, both at room temperature. After the reaction is complete, the final temperature of the solution is 32.5 degree C. Using the specific heat of water, calculate the heat of
  3. Chemistry 400/ Chem 1A

    A chemist mixes 5.216 g of potassium permanganate, 2.318 g of ethanol, and excess sulfuric acid. These chemicals react as follows: 4 KMnO4 + 5 C2H5OH + 6 H2SO4 ---> 4 MnSO4 + 5 CH3COOH + 2 K2SO4 + 11 H20 What mass of sulfuric acid is consumed in this
  4. Chem I

    Ok one more! Write the balanced equations and assign oxidation numbers to all atoms in these two reactions involving iron. If the effective oxidation number of any particular atom changes during the reaction then a redox reaction has occurred. If a redox
  5. chemistry

    I have to calculate the ΔV= final volume-initial volume For the first trial the final volume was .005mL the initial volume was .03mL, which equaled to -.025mL. The volume was negative because it was exothermic reaction. For the second trial the final
  6. chemistry

    I have to calculate the ΔV= final volume-initial volume For the first trial the final volume was .005mL the initial volume was .03mL, which equaled to -.025mL. The volume was negative because it was exothermic reaction. For the second trial the final
  7. chemistry

    An environmental chemist needs to determine the amount of Fe+2 ions in a simple of polluted water from a rusting industrial plant. one procedure is to analyses the sample by using solution of sodium dochromate, Na2Cr2O7. identify the oxdising agent and the
  8. CHEM

    I know I posted this question again but no one is really helping me. Can someone please help me as soon as possible. In a constant-pressure calorimeter, 60.0 mL of 0.340 M Ba(OH)2 was added to 60.0 mL of 0.680 M HCl. The reaction caused the temperature of
  9. Chemistry

    1) A reactions has a delta H of -76 Kj and a delta S of -117 J/K. Is the reaction spontaneous at 298 K? Work: Delta G= -76kJ/mol - 298K(-117J/K/1000) Delta G= -41.134 Spontaneous 2) A reaction has a delta H of 11 kJ and a delta S of 49 J/K. Calculate the
  10. partial pressure

    1) the value of Kb after the decomposition of sulfur trioxide (S03). 2SO3 (g)--2SO2 (g) +O2 (g) is 1.79 x10^-5 at 350 degree celcius. if SO3 initially at 0.200 atm pressure comes to equilibrium in an otherwise empty tank at 350 degree celcius, determine
  11. CHEMISTRY

    What is NOT is good laboratory method for preparation of oxygen gas? is the anwser here C or am i wrong A)photosynthesis B)electrolysis of water C)catalytic decomposition of hydrogen peroxide D) thermal decompositon of KClO3 Photosynthesis is not a good
  12. chemistry

    1) the value of Kb after the decomposition of sulfur trioxide (S03). 2SO3 (g)--2SO2 (g) +O2 (g) is 1.79 x10^-5 at 350 degree celcius. if SO3 initially at 0.200 atm pressure comes to equilibrium in an otherwise empty tank at 350 degree celcius, determine
  13. chemistry

    the value of Kp after the decomposition of sulfur trioxide (S03). 2SO3 (g)--2SO2 (g) +O2 (g) is 1.79 x10^-5 at 350 degree celcius. if SO3 initially at 0.200 atm pressure comes to equilibrium in an otherwise empty tank at 350 degree celcius, determine the
  14. chem

    Complete the reaction? IF no reaction say so H2O C4H6O3 ====> H2O c) Cu ===== > H2O d) K2O=====> e) 2 NaNO3 + ht →
  15. CHEMISTRY> HELP QUICK! pls

    Calculate the reaction free energy of: H2(g) + I2(g) 2HI(g) when the concentrations are 0.026 mol L-1 (H2), 0.33 mol L-1 (I2), and 1.84 mol L-1 (HI), and the temperature is 700K. For this reaction Kc= 54 at 700 K. +11.6 kJ mol-1 0 kJ mol-1 -11.6 kJ mol-1
  16. chemistry

    what is the oxidation half reaction, reduction half reaction, and the complete balanced reaction of the following? (a) Al(s) + MnO4‾(aq) → MnO2(s) + Al(OH)4‾(aq) (b) Cl2(g) → Cl ‾(aq) + ClO ‾(aq) (c) NO2‾(aq) + Al(s) → NH3(g) + AlO2‾(aq)
  17. 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
  18. Another A.P Question

    A different rigid 5.00L cylinder contains 0.176mol of NO(g) at 298 k. A 0.176mol sample of 02(g) is added to the cylinder, where a reaction occurs to produce NO2(g) (d) write the balanced equation for the reaction. (e) calculate the total pressure, in atm,
  19. Biochemistry

    Complete hydrolysis of 25 mM ethyl acetate in an enzyme 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
  20. biology

    Initially, how do skeletal muscles (the type of muscle attached to bones) make ATP? write the reaction for this procss (Crp +ADP => Cr + ATP) as a 'coupled' reaction, identifying the exergonic and endergonic reactions. what would this type of ATP
  21. A.P Chemistry

    A different rigid 5.00L cylinder contains 0.176mol of NO(g) at 298 k. A 0.176mol sample of 02(g) is added to the cylinder, where a reaction occurs to produce NO2(g) (d) write the balanced equation for the reaction. (e) calculate the total pressure, in atm,
  22. Science

    I need help with coming up a hypothesis for and Organic Compound lab! Anyone have an idea?
  23. science

    it has at lease one meal and one nonmetal element. compound salt
  24. Chem

    a dibasic compound , B, has pkb2 = 6.00. Find the fraction in the form of BH+ at pH 9.00
  25. PELAGIE

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

    What is the formula for the compound formed when potassium reacts with nitrogen?
  27. chemistry

    What is the chemical formula of the compound that forms between lithium (Li) and phosphorus (P)?
  28. Chemistry

    A compound contains 84% carbon and 10% hydrogen.find the emperical formula.
  29. chem

    Which compound has a higher boiling point and why? a. PF3 b. PF5
  30. biology

    which of the following is not an organic compound: cellulose sucrose water testosterone
  31. Chemistry

    why are most elements on the periodic table found as compound in nature?
  32. Chemistry

    Write the formula for each Ionic compound. *barium nitrate
  33. English

    Is The dog followed the rabbit when it jumped into the bushes. a compound sentence?
  34. 8th grade

    what kind of electron determines if a compound is covalent or ionic?
  35. MATHEMATICS.

    FIND THE COMPOUND INTEREST OF 1400 IN 4YEARS AT 3% PER ANNUM
  36. Chemistry

    what compound is the result of silver nitrate and potassium bromide
  37. physical science

    for an ionic compound, the name of the negative ion comes first. True or False?
  38. Chemistry

    The Ksp of iron(II) hydroxide, Fe(OH)2, is 4.87 × 10-17. Calculate the solubility of this compound in g/L.
  39. chemistry

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

    The percentage composition of chlorine, by mass, in the compound K2PtCl4 is
  41. Chemistry

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

    Why is water only compound occuring naturally on earth in three states?
  43. Chemistry

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

    What is the correct name of the compound that is incorrectly named 1-chloro-3-pentyne?
  45. Chemistry

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

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

    what compound is formed if you combine iron, sulphur and oxygen?
  48. chemistry

    which do you think would be more dangerous near an open flame, an ionic or covalent compound?
  49. science

    Calculate the mass percent composition of each element in each compound.
  50. Business mathematics

    Find the compound interest on 650 in 5 years at 4% per annum
  51. trig

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

    What happens when an electric current is passed through a solution of an ionic compound?
  53. applied algebra

    $800 at 5 1/2% annual interest, compound semiannually, for 7 years
  54. 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
  55. ENGLISH

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

    Solve the compound inequality graph solution 6x-410
  57. chemistry

    Write a formula for the compound that forms from potassium and acetate.
  58. chemestry

    calculate the moles of compound in .540g of ammonium bromide
  59. English

    In the sentence Manuel is the new goalie on the team. What is the compound noun
  60. chemistry

    whats the oxidation number for all the elements in the following compound BaNaPO4
  61. 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
  62. chemistry

    Can you make a compound and show the electrons for magnesium and sulfur
  63. Algebra

    Write the solution in interval notation x=-2. ) What would the compound inequality look like? Thanks for the help!
  64. science

    Ddraw an electron dot structure for a compound of fluorine and Z?
  65. Chemistry- Naming compounds Nomenclature

    i am having trouble with this compound. Molybdenum (VI) Chromate I'm have it find its formula and can't seem to get it. Thanks for the help.
  66. 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
  67. grammar

    identify simple complete and compound subject and predicate
  68. Chemistry

    Which compound is most polar in nature? a) CO2 b) H2O c) F2 d) NaCl
  69. algebra

    Solve the compound inequality graph solution-2
  70. chemistry

    how do i name the ionic compound bythis formula (NH4)2Cr2O7
  71. Chemistry

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

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

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

    Name the ionic compound form when a Magnesium reacts with chlorine?
  75. Chemistry

    What physical properties will the ionic compound CaSO4 be expected to have?
  76. algebra

    solve the compound inequality 3x-5>-17 and 4x+3
  77. maths trigonometry

    Expand the following using compound angle formulae Sin(m-n) Cos(p-55)
  78. Chemistry

    Why would Magnesium (Mg) be unable to combine with Chlorine (Cl) to make a compound?
  79. chemistry

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

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

    If I invest $30000 at 10% compound interest for eighteen years how much will i get
  82. chemestry

    a compound salt Xcl2 contains 203% chloride what is element x?
  83. Chemistry

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

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

    what is the total number of atoms in the compound (NH4)3PO4?
  86. 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
  87. solubility

    The Ksp of mercury II hydroxide is 3.60 x 10^-26. Calculte the solubility of this compound in g/L
  88. physical science

    is AL ( aluminium) an element compound formula atom molecule
  89. English

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

    Does Organic compound have weak or strong intermolecular forces?
  91. Science

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

    What do I do if a compound inequality contradicts itself? Do I put down empty set, or what?
  93. business math

    What is the amount of compound interest for the investment in previous question
  94. chemistry

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

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

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

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

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

    Milk is an example of a A.solution B.homogenous mixture C.colloid D.compound I think its a??
  100. Chemistry

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