1. chemistry

    When magnesium metal and an aqueous solution of hydrochloric acid combine, they produce an aqueous solution of magnesium chloride and hydrogen gas. Using the equation, Mg (s) + 2HCl (aq) Imported Asset MgCl2 (aq) + H2 (g), if 72.9 g of Mg and 146.0 g of
  2. chemistry

    When magnesium metal and an aqueous solution of hydrochloric acid combine, they produce an aqueous solution of magnesium chloride and hydrogen gas. Using the equation, Mg (s) + 2HCl (aq) Imported Asset MgCl2 (aq) + H2 (g), if 72.9 g of Mg and 146.0 g of
  3. Science test review

    Here are all the word you can use I need help chemical property mixture heat capasity homogeneous viscosity sublimitation physical property compound chemical formula substance density mass tempurature pressure heterogenerous 14. A property of matter
  4. Statistics

    Across the USA, results for these exams are normally distributed. What does that mean and why is this the case? If you were to create a histogram of all GRE scores, what would you expect the histogram to look like? Would it be symmetrical? Would it be bell
  5. Chemistry Problem

    A student proposes to use visible spectroscopy to measure the kinetics of the permanganate/oxalic acid reaction. The initial permanganate solution was very dark. For a 1 cm sample cell, the absorbance A = 2,500[MnO4]. As a practical rule of thumb, Beer's
  6. Chemistry- Dr.Bob!

    Combustion of natural gas (primarily methane) occurs in most household heaters. The heat given off in this reaction is used to raise the temperature of the air in the house. Assuming that all the energy given off in the reaction goes to heating up only the
  7. Chemistry

    Combustion of natural gas (primarily methane) occurs in most household heaters. The heat given off in this reaction is used to raise the temperature of the air in the house. Assuming that all the energy given off in the reaction goes to heating up only the
  8. chemistry

    what experimental difficulty would you encounter if you had neglected to include a drying step before evaporating the ether solution of the neutral organic compound? Water was added to the organic solvent ,but a drying agent wasn't added. So would the
  9. Chemistry Damon step bystep for me

    A 0.887g sample of a mixture of nacl and kcl is dissolved in water and the solution is treated with an excess of agn03 producing 1.822g of agcl. What is the percent by mas of each compound in the mixture My calculation 1.822g/143g/mol = 0.013M x/58 + y/74
  10. algebra

    i did not get a response so i am rewording question . please help if you can. thanks ann store A charges 9.75% tax store B charges 7.25% tax If a shopper's pre tax receipt is between $11.57 and $81.43, write a compound inequality that describes the
  11. science

    Dust mites are microscopic bugs that are too small to see with a dissecting microscope. To see the details of a dust mite’s skin, which of the following microscopes would you use? A. dissecting microscope B. compound microscope C. transmission electron
  12. science

    Dust mites are microscopic bugs that are too small to see with a dissecting microscope. To see the details of a dust mite’s skin, which of the following microscopes would you use? A. dissecting microscope B. compound microscope C. transmission electron
  13. Chemistry

    0.0337g of a volatile liquid when vaporized completely at 100Pa and 300K occupied a volume of 20cm3. When this volume of vapor was completely burnt in an excess of oxygen, 40cm3 of carbon dioxide and 20cm3 of water vapor were formed. All volumes being
  14. Chem.....

    Methanol, CH3OH, is produced on an industrial scale from carbon monoxide and hydrogen. At the temperatures used, gaseous methanol is formed according to the following thermochemical equation: CO(g)+ 2H2(g) CH3OH(g) H = -90Kj 1. State Le Chateliers
  15. Chemistry

    How can you increase the concentration of the product (s) in each of these reactions by varying the temperature and pressure (caused by volume change)? 4NH3 + 5O2 4NO + H2O Delta H = -903.75 kJ Br2 + Cl 2BrCl Delta H = 14.64 kJ Please help... With gaseous
  16. Science asap

    Which organisms are capable of converting gaseous nitrogen in the air into a form that other living organisms can use? nitrogen-fixing bacteria denitrifying bacteria decomposers producers Which step in the nitrogen cycle is accelerated at the beginning of
  17. chemistry 1

    if 20.2g of zn react with and equal amount of magnesium chloride to form magnesium and zinc chloride[zn+mgcl2> mg+zncl2] a.what is the limiting reactant? b. how much magnesium will be produced? Here is the way to solve most of these stoichiometry problems.
  18. Chemistry

    Given 2Al2O3 (s) --> 4Al(s) + 3O2 (g) (standard enthalpy change= 3351.4 kJ) a) What is the heat of formation of aluminum oxide? How do I find heat of formation from standard enthalpy change? I know how to do it when I'm given enthalpy, but they aren't the
  19. Chemistry

    You isolate an acidic compound in an experiment by first separating it from the organic layer. Then you have a solution containing a salt of an acid. You acidify it using concentrated HCl. A precipitation begins to form while the solution is still basic..
  20. Chemistry(Please check!!)

    Write the balanced, complete, and net ionic equations for each precipitation reaction. 1) AgNO_3 + CoCl_2 ---> BE: AgNO_3(aq) + CoCl_2(aq) ---> AgCl_2 (aq) + Co(NO_3)(aq) CIE: Since the balanced equation is all (aq) there is no reaction so no complete or
  21. Chemistry(Please help, thank you!!!)

    Write the balanced, complete, and net ionic equations for each precipitation reaction. 1) AgNO_3 + CoCl_2 ---> BE: AgNO_3(aq) + CoCl_2(aq) ---> AgCl_2 (aq) + Co(NO_3)(aq) CIE: Since the balanced equation is all (aq) there is no reaction so no complete or
  22. chem

    I have to balance an equation and I had to make the equation from an experiment we did. So far, my equation looks like this and I know what I have is correct: Cu(NO3)2+H20+NaOH----->Cu(OH)2 I think I probably need an N or a Na on the right side. What do
  23. Finance

    Joe and Sue invested $1500 at Bank America in 2000, at 4% compounded quarterly. In the year 2005 they moved to another city and took the total money from their first investment added $500 and invested it at Bank Bravo, at 5% compounded quarterly. a. What
  24. Language Arts

    1. "Outstanding" is a compound word. Think about what its two parts, "out" and "standing" mean. What does "outstanding" most likely mean? a. exceptional b. obvious c. standing outside d. tall To answer questions 2 and 3 identfiy whether the capitalized
  25. E.L.A. PLEASE CHECK!

    Which choice best describes the underlined word or words in each sentence? The ancient Sumerians, Egyptians, and Chinese each developed a unique system of writing. Underlined is: Sumerians Egyptians Chinese A- simple subject B- compound subject C- complete
  26. Engish

    Is these correct: Simple-Dolphins are very intelligent, social creatures. Compound- Dolphins are very intelligent and social creatures. Help on these on: Simple- Katy is thinking she might like to become a marine biologist one day.
  27. science

    Which of the following is NOT true about compounds? A) compounds join in specific ratios according to their masses B) the mass ratio of a specific compound is always the same C) compounds are random combinations of elements D) different mass ratio mean
  28. Chemistry

    nitrogen reacts with oxygen to form 2 compounds. Compund A contains 2.8 g of nitrogen for each 1.6 g of oxygen. Compound B contains 5.6g of nitrogen for each 9.6g of oxygen. What is the lowest whole number mass ratio of nitrogen that combines with a given
  29. Chemistry

    nitrogen reacts with oxygen to form 2 compounds. Compund A contains 2.8 g of nitrogen for each 1.6 g of oxygen. Compound B contains 5.6g of nitrogen for each 9.6g of oxygen. What is the lowest whole number mass ratio of nitrogen that combines with a given
  30. Chemistry

    Cyclohexane, C6H12, a hydrocarbon, can isomerize or change into methylcyclopentane, a compound of the same formula (C5H9CH3) but with a different molecular structure. The equilibrium constant is 0.12 at 25°C. If you had originally placed 0.036 mol of
  31. organic chemistry

    urgent, please help me...this is about the separation and purification scheme... there is 4 group of mixture: a)benzoic acid, benzoin and 1,4-dibromobenzene b)fluorene, o-toluic acid and 1,4-dibromobenzene c)phenanthrene, methyl 4-aminobenzoate and
  32. math

    sam invested $5000 in a GIC earning 8% compound interest per year, the interest gets added to the amount invested, so the next year sam gets the interest on the interest already earned , as well as on te original amoun, how much will sam's investment be
  33. math

    (MC) If the compound interest on $1000 for two years at 9% p.a., payable half-yearly is $x, find x. A) 1000x9/100x2 B) 1000(1+9/100)⁴ C) 1000(1+4.5/100)⁴ D) 1000(1+9/100)²-1000 E) 1000(1+4.5/100)⁴-1000
  34. Chemistry

    The half-life of a first order reaction is determined to be 61.0 years. How long will it take for the concentration of the reactant to reach 2% of its initial value?
  35. Chemistry

    Consider the reaction 2D2(g)+O2(g)→2D2O(l) What is the mass of heavy water, D2O(l), produced when 3.75g of O2(g) reacts with excess D2(g)?
  36. Chemistry

    What happens to the equilibrium constant when a catalyst is added to the reaction mixture. A. Increase B. Decrease C. Does not change D. Varies E. None of the above I chose c
  37. ELA

    In "a days wait", how can the fathers reaction to his sons concern best be describe? A. Impatient B. Anger C. Frustrated D. Understanding
  38. health

    it is important to report changes in a client behaviour because A)change is of intrest to all B)the family of the person will ask about it. C)it may be a treatable medical reaction D) all of the above.
  39. chemistry

    The half-life of a first order reaction is determined to be 74.5 years. How long will it take for the concentration of the reactant to reach 2% of its initial value?
  40. Chem

    The half-life of a first-order drug degradation reaction is 48hrs. Calculate the rate constant. Thx!!!
  41. Chem

    H2SO4(aq) + Ba(NO3)2(aq) = BaSO4(s) + 2HNO3(aq) overall heat gen by reaction answer is supposed to be -659.3 but I keep coming up with something else.
  42. chemistry

    The half-life of a first order reaction is determined to be 79.0 years. How long will it take for the concentration of the reactant to reach 2% of its initial value?
  43. physics

    what is reaction product when ethene is treated with steam using phosphoric acid as catalyst at 300 degrees celcious
  44. health

    it is important to report changes in a client behaviour because A)change is of intrest to all B)the family of the person will ask about it. C)it may be a treatable medical reaction D) all of the above.
  45. Williamson Reaction- CHEM

    What would be the fate of any unreacted NaOEt reactant, ie. where does it end up, would it be a contaminant in the crude product or would it be removed, if so how (williamson reaction)
  46. science fair

    Does multitasking help a person or mess up all tasks?(referring to human reaction) is there any way to make this topic more complex and difficult?
  47. chemistry

    When 34.1 g of lead reacts with 6.81 L of oxygen gas, measured at 1.00 atm and 25.0°C, 36.1 kJ of heat is released at constant pressure. What is DH° for this reaction?
  48. chemistry

    The half-life of a first order reaction is determined to be 60.5 years. How long will it take for the concentration of the reactant to reach 2% of its initial value?
  49. Chemistry

    Write out a balanced chemical equation to show the dissociation reaction of magnesium carbonate in distilled water
  50. chemistry

    The half-life of a first order reaction is determined to be 72.5 years. How long will it take for the concentration of the reactant to reach 2% of its initial value?
  51. Chemistry

    Given the following data, calculate the enthalpy change for the reaction S(s)+ O2(g)->SO2(g) S(s)+(3/2)O2(g)->SO3(g) H=-395.2 kJ 2SO2(g)+ O2(g)->2SO3(g) H=-198.2 kJ
  52. Chemistry

    The half-life of a first order reaction is determined to be 85.5 years. How long will it take for the concentration of the reactant to reach 2% of its initial value?
  53. Chemistry

    If a particular reaction evolves 192 kJ of heat while expanding from 1.00 L to 2.00 L at 125 atm of pressure, what is the overall energy change for the system?
  54. organic chemistry

    Show the reaction equation and mechanisms of a mixture of napthalene,p-nitroaniline and benzoic acid dissolved in dichloromethane?
  55. Chemistry

    Dilute H3PO4(aq) and NaOH(aq) are mixed in chemically equivalent quantities. Write the formula equation for the reaction
  56. organic chemistry

    Show the reaction equation and mechanisms of a mixture of napthalene,p-nitroaniline and benzoic acid dissolved in dichloromethane?
  57. chemistry

    The half-life of a first order reaction is determined to be 65.0 years. How long will it take for the concentration of the reactant to reach 2% of its initial value?
  58. chemistry

    The half-life of a first order reaction is determined to be 92.0 years. How long will it take for the concentration of the reactant to reach 2% of its initial value?
  59. 11th grade

    If the volume of water produced during the reaction doubled, what would happen to the ratio of hydrogen to oxygen in the following equation: 2 H2+ O2 --> 2 H2O
  60. chemistry

    What mass of sodium carbonate must be used to produce 10.36L of carbon dioxideat 24°C and 103kPa aaccording to neutralization reaction.
  61. Chemistry

    suppose 8.00 g of CH is allowed to burn in the presence of 9.00 g of oxygen. how much (in gram) CH4 , O2 and H2O remain after the reaction is complete ?
  62. Chemistry

    The half-life of a first order reaction is determined to be 92.0 years. How long will it take for the concentration of the reactant to reach 2% of its initial value?
  63. chemistry

    Calculate the free energy change of the following reaction (in kJ). 3A^2+ +2B------->3A + 2B^3+ Ecell= 1.66 -(5 mol)*(9.65*10^4)*1.66= -8.0095*10^5 Did I do it right? or is the number of electrons wrong?
  64. Chemistry

    Consider 30.0 mL of water that has absorbed 1540 J of heat from a chemical reaction. What is the change in temperature that should be observed in degrees Celsius?
  65. Chemistry

    Given the following data: S(s) + 3/2 O2(g)-->SO3(g) ∆H = -395.2 kJ 2SO2(g) + O2(g) -->2SO3(g)∆H = -198.2 kJ Calculate ∆H for the reaction S(s) + O2(g) --> SO2(g) Could someone please tell me how you would go about doing this type of problem?
  66. organic chwmistry

    When bromobenzene reacts with propene in a Heck reaction, two constitutional isomers are obtained as a product. Give the structures of the two
  67. Chem

    Balance the following redox reactions in acidic solution by the half-reaction method Br–(aq) + I–(aq) + HClO(aq) = Br2(l) + IO3 + Cl–(aq)
  68. adult education

    summarizes the processes of blood clotting, immune response, allergic reaction, and hormone release and how are they interrelated
  69. chemistry

    What is the mass of the organic substance formed by heating of 21.0g of butanoate of ammonium, admitting that the reaction presents a yield of 50%?
  70. Chemistry

    What would Qc be if the volume of the container increased by a factor of 1.604 for this reaction SO2+Cl2 SO2CL2 kc = 12.821 at 373K
  71. Chemistry

    Calculate the work done (in joules) by a chemical reaction if the volume increases from 3.3L to 3.5L against a constant external pressure of 3.7atm .
  72. CHEMISTRY

    Balance the oxidation reduction equation in half reaction PbO2 + KCl => KClO + KPb(OH)3 thank you a lot
  73. Chemistry

    Given the Na+/Na and K+/K half-cells, determine the overall electrochemical reaction that proceeds spontaneously and the E0 value. Answer in units of V Can you please explain the steps?
  74. PIMACOMMUNITY COLLEG

    WRITE THE NET IONIC EQUATION INCLUDING the phases for the reaction of the Hclo2+Naoh--------->H2o+Naclo2
  75. chemistry-electrochem

    Determine the equilibrium constant, Keq, for the reaction 5.3 10–19 18.30 1.7 1054 1.9 1018 5.7 10–55 this is an assignment question- as writen, no values, nothing. any help
  76. Chemistry

    . Show a chemical reaction by which hardness is added to water that also explains the formation of caves in limestone formations?
  77. Physics

    If Galileo and his assistant were 16 km apart, how long would it take light to make the round-trip? How does this time compare with reaction times of about 0.4 s?
  78. chemistry

    How much H2 gas at STP can be produced by the reaction 2 Na(s) + 2 H2O(ℓ)heat−→ H2(g) + 2 NaOH(aq) of 3.90 g of Na and excess water? Answer in units of L.
  79. chem

    what is the percent yield if 27 g of h20 obtained when 33 g of c3h8 reacts with 56 L of 02 at STP.The secong product of reaction is CO2
  80. chemistry

    For the reaction 2A(g) + B(aq) + 3C(l) D(s) + 3E(g), the concentrations at equilibrium are found to be: A: 2.3x10^3 Pa B: 1.8x10^-2 M C: 15.8M D: 12.5M E: 5.6x10^4 Torr i got an answer of 1.83x10^-13 is this correct??
  81. chemistry

    In a reaction, 25.0 grams of magnesium are added to a beaker containing 75.0 mL of 2.00 M nitric acid, HNO3. Which reactant is limiting? Which is in excess?
  82. Inorganic chemistry

    write a balanced half-reaction for the reduction of permanganate ion, Mn04, to Mn02 in a basic solution
  83. Chemistry

    In the reaction C(s) + 2S(s) ¨ CS2(l), the change of enthalpy (ƒ¢H) is 89.3 kJ. Calculate the amount of heat absorbed when 6.33 g of carbon disulfide is formed.
  84. Chemistry

    Determine the total number of electrons transferred in the following balanced reaction. 4 MnO4– (aq) + 12 H3O+ (aq) → 4 Mn2+ (aq) + 5 O2 (g) + 18 H2O (g)
  85. chemistry

    If 10.0 L of butane and oxygen are combined at the same temperature and pressure, which gas will be left over after reaction? Include your calculation/reasoning.
  86. chemistry

    Write the balanced equation for the neutralization reaction between H3PO4 and NaOH in aqueous solution. Phases are optional.
  87. chemistry

    Urea (CO(NH2)2) can react with water to form CONH2NH+ 3 and a hydroxide ion. Which statement is true for this reaction?
  88. Chemistry

    when 0.20 mole HF is dissolved in water to a volume of 1.00 L, 5.8% of the HF dissociates to form F- (aq). What is the equilibrium constant for the reaction ? HF(aq) +H2O(l) ------ F- (aq) +H3O+ (aq)
  89. Chemistry

    when 0.20 mole HF is dissolved in water to a volume of 1.00 L, 5.8% of the HF dissociates to form F- (aq). What is the equilibrium constant for the reaction ? HF(aq) + H2O (I) ----- F- (aq)+H3O+(aq)
  90. chem

    Consider the reaction 4KO2(s) + 2CO2(g) ! 2K2CO3(s) + 3O2(g) . How much KO2 is needed to react with 75.0 L of carbon dioxide at STP?
  91. Chem

    Write a balanced equation for reaction of sodium with diethyl amine, molecular hydrogen, ethanol, and water.
  92. Chemistry

    What happens when sulphur reacts with iron? Does it make any colours before it turns dark grey? Does it do anything significant that I should need to know? I know that it is an exothermic reaction but is that it? Please help, Thanks.
  93. chemistry

    Write an equation for the reaction that take place in hydrogen sulphide gas when bubbled through a solution of zinc nitrate
  94. azad university

    solving advance reactor ideal gas with the this reaction : 4ph3 ->p4+6h2 (xa=0.5 , T=400k) , P=20 atm) how much volume we need until Xa=0.5 ?
  95. Chemistry

    Calculate the volume (in mL) of 0.627 M HNO3 needed to react completely with 8.12 g of BaCO3 in a gas-forming reaction
  96. chemistry

    In the reaction Mg(s) + 2HCl(aq) d H¿(g) + MgCl¿(aq), how many moles of hydrogen gas will be produced from 250.0 milliliters of a 3.0 M HCl in an excess of Mg?
  97. Chemistry

    For the second order reaction: A -> products the plot of what term versus time would yield a straight line? 1/[A] ln[A]/[A] [A] ln[A] I'm pretty certain it's ln[A]?
  98. SCIENCE

    THE VALUE OF KC=6.2 AT 750K FOR THE REACTION CO+H20 CO2.IF INITIALLY THE QUANTITIES OF CO AND H2O ARE 2 MOLES IN 1L.WHAT COULD BE THE EQUILIBRIUM CONCENTRATIONS FOR ALL CHEMICALS?
  99. chemistry

    a test liquid has a density of 1.1g ml wen u pour some of it in a cup of water what will happen assuming that they have no chemical reaction
  100. Chemistry - Cell Potential

    Determine the delta G(o) and the equilibrium constant for the following reaction at 323 K. 2Br- + I2 --> Br2 + 2I- I got 100 kj/mol and K 7.19x10^16 but not sure if this is right