1. Chimestry

    (The reaction of calcium hydride and water produces calcium hydroxide and hydrogen as products). How many moles of H_2(g) will be formed in the reaction between 0.90mol CaH_2(s) and 1.33mol H_2O(l)?
  2. Chemistry

    50 mL of a 2.5 M solution of ammonium phosphate is added to 100 mL of 1.5 M solution of calcium nitrate. At the end of the reaction 11.2 grams of solid product were obtained. Whats the % yield of this reaction?
  3. Chemistry

    The following reactions is a first order reaction with respect to nitrite ion and its rate constant is 0.0030/s. In a solution that is 10.0 M NO2-, what is the half-life of the reaction? NH4+ + NO2- -->N2 + 2H2O
  4. Physics

    For a certain Chemical reaction, you find that delta H = -100kJ and delta S = -200 J/K. What is the Gibbs free energy for the reaction at: (a) room temperature (b) 800 C (c) comment on whether the reactions are spontaneous or not
  5. organic chemistry

    Show the reaction of 1-naphthylamine hydrochloride with sodium hydroxide using structural formulas. Indicate which layer (aqueous or organic) each component in the reaction will mainly reside in (for both products and reactants). How is this done?
  6. Chemistry

    The combustion of methanol (CH3OH) forms carbon dioxide and water vapor. A combustion reaction refers to a reaction of a substance with oxygen gas. What is the balanced equation?
  7. chemistry

    For the reaction Al (s) + 3 HCl (aq) -> AlCl3 (s) + ₃/₂ H2 (g), it was observed that when 4.00 g of aluminum reacted with excess HCl, exactly 30.0 kJ of heat were released. The delta H for this reaction is a) – 91.3 kJ b) – 120 kJ c) –
  8. chemistry

    Consider the following reaction:4HCl(g)+O2(g)produces 2H2O(g) + 2Cl2(g) How many molecules of Cl2 would be formed from the reaction mixture that produces the greatest amount of products? Express your answer as an integer.
  9. chemistry

    For the reaction Al (s) + 3 HCl (aq) -> AlCl3 (s) + ₃/₂ H2 (g), it was observed that when 4.00 g of aluminum reacted with excess HCl, exactly 30.0 kJ of heat were released. The delta H for this reaction is a) – 91.3 kJ b) – 120 kJ c) –
  10. chemistry

    what would the written chemical reaction be to this problem? How many grams of hydrochloric acid should we use so we have exactly enough to react with 40g of sodium hydroxide? You'll need to write a chemical reaction, balance it, and then perform your
  11. Grade 9th

    If 6.5g of zinc reacts with 5.0g of HCL,according to the reaction.Zn + 2HCL:zncl2+h2 Which substance is the limiting reaction? How many grams of the reactant remains unreactant? How many grams of hydrogen would be produce?
  12. Chemistry

    Consider the reaction 2H2O(g) --> 2H2(g) + O2(g) deltaH = +483.6 kJ/mol at a certain temperature. If the increase in volume is 32.7 L against an external pressure of 1.00 atm, calculate deltaU for the reaction. (1 L * atm = 101.3 J)
  13. College Chemistry

    Consider the reaction. 4Fe(s) + 3O2(g) ¨ 2Fe2O3(s) If 0.500 mol of Fe reacts with 0.400 mol of O2, what are the limiting reactant and the theoretical yield in moles of Fe2O3 for the reaction, respectively?
  14. Chem

    What reaction(s) could happen if we left the same reaction mixture (from the conversion of dimethyl fumarate to dimethyl maleate) for 6 months in the absence of light? Use chemical eqns to explain your answer.
  15. Chemistry

    1. For the reaction 2N2O(g) ⇋ O2(g) + 2N2(g), what happens to the equilibrium position if the pressure decreases? A. Shift to the right B. Shift to the left C. Doubles D. Does nothing E. Halves 2. if an equilibrium reaction shifts to the right when
  16. Chemistry

    At a high temperature, the equilibrium constant for the decomposition of hydrogen iodide is 65.0. If the initial concentration of HI is 1.60 M, what is the concentration of hydrogen at equilibrium? 2Hl(g) H2(g) + I2(g) A. 1.42 M B. 0.753 M C. 0.240 M D.
  17. Chemistry

    The balanced equation for the decomposition of sodium bicarbonate is 2 NaHCO3 (s) --> Na2CO3 (s) + H2O (g) + CO2 (g)delta H 129.2. Using the enthalpies of formation, calculate the enthalpy of formation of sodium bicarbonate.
  18. chemistry

    What is the empirical formula of a substance that contains 8.33×10−2 mol of carbon, 0.167 mol of hydrogen, and 8.32×10−2 mol of oxygen?

    Which choice best describes the underlined words in this sentence? There goes that antique fire truck from the car show. A- simple subject B- complete subject C- compound subject D- none of the above I think B. Which choice best describes the underlined
  20. Chemistry

    I have a question for chem 1LD webworks number 4. it asks to repeat the previous question steps and find the delta H for the high spin and low spin for Fe(ox)3 3- but calculate with B3LYP, 6-31G* instead of a semi-empirical
  21. chemistry

    What is the rate of disappearance of dinitrogen pentoxide between 100 s and 200 s? Is this rate higher or lower than the rate from 0 s to 100 s that you calculated in part c? As the reaction takes place, what happens to [N2O5]? In general, does a higher
  22. Biochemistry

    You wish to make 3 reactions (1 ml each) with the specified amounts of protein. The remainder of each reaction consists entirely of buffer. The source of your protein is a stock solution that has a concentration of 0.5 mg/ml. What is the volume of stock
  23. chemistry

    How is ambient energy relative to whether a reaction is spontaneous?? Does Exothermic reaction that is self-sustaining not have any ambient energy? I don't know but if there is a higher amount of ambient energy is the reaction spontaneous? I don't think a
  24. Chemistry

    2 Al(s) + 3 Cl2(g) → 2 AlCl3(s) Into a cylinder with a moveable piston (pressure stays constant), a piece of aluminum is placed and chlorine gas is added. After they react, the temperature inside the piston is considerable higher than its initial
  25. Statistics

    The life spans of three randomly selected tires are 31,950 miles, 36,050 miles, 34,000 miles. Using the empirical rule, find the percentile that corresponds to each life span.
  26. statistics

    the life spans of three randomly selected tires are 31,400 miles, 40,600 miles and 36,000 miles. Using the empirical rule, find the percentile that corresponds to each life span.
  27. chemistry

    Imagine there is a tank of unknown gas that contains 53.31% carbon, 35.51% oxygen, and 11.18% hydrogen by mass. At 35.0 °C and 0.470 bar, 2.0 L of the gas has a mass of 3.3 g. Using this information, answer the following questions. a.) What is the
  28. Chem

    If a sample of the radioactive nuclide 139Cs has an activity of 0.0730 Ci, what is the instantaneous rate of decomposition of 139Cs in terms of grams per second? The mass of 139Cs is 138.9134 amu. (1 Ci = 3.700 × 1010 disintegrations/s, 1 amu = 1.66054 ×
  29. college

    if a sample of the radioactive nuclide 139cs has an activity of 0.0730 ci, what is the instantaneous rate of decomposition of 139cs in terms of grams per second? the mass of 139cs is 138.9134 amu. 1 ci 3.700 × 1010 disintegrations/ s, 1 amu 1.66054
  30. chemistry

    Consider the formation of cyanogen c2n2 and its subsequent decomposition in water given by the equations 2Cu2+ + 6CN- 2[Cu(CN)2]- + C2N2 C2N2 + H2O HCN + HOCN How much hydrocyanic acid HCN can be produced from 35.00 g of KCN, assuming 100% yield?
  31. science

    A scientist is studying a chemical reaction. She predicts that after the reaction the product will have less chemical potential energy than the reactants had originally. The scientist observes the reaction, and notes that no light or sound is produced.
  32. Calculus

    For the decomposition of Carbon 14, find the age of a prehistoric cave painting discovered in the Lascaux Caves in southern France if the amount of Carbon 14 has decayed to 14.29%...again using calculus formulas. Not sure how to use this equation (content
  33. Chemistry

    Is the following reaction spontaneous at 25*C? delta s reaction = -217 J/K*mol delta H rxn = -1202 KJ 2Mg (s) + O2 (g) -> 2MgO (s) delta suniverse = delta s system - delta H system / T i got positive (+) 3.81 x 10 ^ 3 J/K and my notes says it is
  34. chemistry - equilibrium Help

    you observed that very little corrosion occurred on the nail immersed in NaOH(aq) solution. This observation is difficult to explain from an electrochemistry perspective since electrochemistry principles predict a spontaneous reaction that should cause
  35. chemistry-help!

    The initial rate of reaction for H2O2(aq) <-> H2O (l) 1/2 O2 (g) is found to be 1.7x10(-3)M/s. Assume that this rate holds for 2 minutes. Start with 160ml of 1.60 M H2O2. How many milliliters of O2 measured at 24C and 760mmHg , are released from
  36. Chemistry

    A compound containg 3 atoms of carbon and 8 atoms of hydrogen is combined in a reaction with oxygen molecules. The two end products of this equation are carbon dioxide (CO2) and water. What element should you look at first in balancing this equation? Is
  37. Chemistry

    A compound containg 3 atoms of carbon and 8 atoms of hydrogen is combined in a reaction with oxygen molecules. The two end products of this equation are carbon dioxide (CO2) and water. What element should you look at first in balancing this equation? Is
  38. chem!

    Calculate the heat of reaction for the incomplete combustion of 67.0g propane producing carbon monoxide gas and water vapour. how would I go about and do this question? What are you studying? Do you know how to use the thermodynamic tables (delta Ho, etc).
  39. chemistry

    Need some help. have the A part of the question but do not know how to set B or C. Butadiene (C4H6) reacts with itself to form a dimer with the formula C8H12. The reaction is second order in butadiene. If the rate constant at a particular temp is 0.04/(M
  40. Science Help!

    Which sequence of processes must occur for an atom of carbon to go from a human to a car? A. Respiration, photosynthesis, decompiosition B. Fossilization, decomposition, respiration C. Photosynthesis, combustion, respiration D. Respiration, fossilzation,
  41. Chemistry - please help!

    The decomposition of KClO3 produces oxygen gas and solid KCl. What mass of KClO3 must be decomposed to produce 126 L of oxygen gas at 133 Celsius and .88 atm? I know I need to use PV=nRT but I can't figure out how.
  42. Chemistry

    What type of reaction is listed below? Prove that it is balanced by listing the number of elements on both side of the equation (reactants vs. products)? CH 3 COOH + NaHCO 3  NaCH 3 COO + H 2 CO 3 2. What type of reaction occurred with H 2 CO 3
  43. Chemistry

    The reaction of NO and O2 produces NO2. 2 NO(g) + O2(g) „_ 2 NO2(g) The reaction is second-order with respect to NO(g) and first-order with respect to O2(g). At a given temperature, the rate constant, k, equals 4.7 x 10^2 M^¡V2s^¡V1. What is the rate
  44. AP Chemistry

    (a) When 300.0 milliliters of a solution of 0.200 molar AgNO3 is mixed with 100.0 milliliters of a 0.0500 molar CaCl2 solution, what is the concentration of silver ion after the reaction has gone to completion? (b)Write the net cell reaction for a cell
  45. AP Biology

    The respiration of plants is a biochemical reaction and should have a rate determined by the Arrhenius equation, k = Ae-EA/RT. Here, k is the rate, A is a constant, EA is the activation energy for the reaction, R is the gas constant, and T is the
  46. Chemistry 3A

    An aqueous solution contains the ions B, C, and D that are in equilibrium with one another according to the reaction B (aq) + C (aq) ->/<- D (aq) A certain amount of water is added so as to double the volume of this solution, while keeping the
  47. chemistry

    The typical battery used in a standard flashlight produced approximately 1.5 V. If the value for ΔG° of the reaction were −289,500 J, what would you calculate as the moles of electrons exchanged in the balanced redox reaction? I got 1 mols for
  48. Chemistry

    How many milliliters of O2 are consumed in the complete combustion of a sample of hexane, C6H14, if the reaction produces 325 mL of CO2? Assume all gas volumes are measured at the same temperature and pressure. The reaction is 2C6H14(g) + 19O2(g) ->
  49. chem

    Consider the following unbalanced equation: C2H5OH(g) + O2(g) → CO2(g) + H2O(l) 1.55 g of ethanol reacts with 10.0 g of oxygen. What is the total volume of gas present (in L) after the reaction is complete, assuming the reaction takes place at 1.00
  50. Inorganic chemistry

    The standard free energy change for a chemical reaction is -18.3kJ/mole. What is the equilibrium constant for the reaction at 87 degrees Celsius? (R=8.314J/K*mol) Delta G = -Rtlnk -18,300/8.314/360 = -6.114
  51. Chem

    A 7.50g sample of aluminum is placed in 250.0 mL of 1.80 mol/L sulfuric acid. The reaction is not nearly as vigorous as expected and produces only 427 mL of gas at 27 degrees celsius and 480 kPa pressure. Calculate the percentage Yield of the reaction
  52. Organic chem

    When you react 1-octene wih borane tetrahydrofuran solution and hydrogen peroxided over NaOH and water... (hydroboration- oxidation reaction) how do you run the reaction differently to improve the yield of the major product 1-octanol?
  53. AP Chemistry Help!

    I had to conduct an experiment to find the enthalpy of reaction for : 4Fe + 3O2 + 6H2O ----> 4Fe(OH)3 In the experiment , I started with an inital temperature of 22.3 C and edned with 36.7 C so the delta T is +14.4C. Now it's telling me to calcualte the
  54. chemistry

    Decide if each of the following principles were first discovered during Thompson's cathode ray tube experiments, Rutherford's gold foil experiment, Millikan's oil drop experiment or none of these. Label each one with either Thompson, Rutherford, Milikan,
  55. college chemistry

    The chemical reaction representing production of water gas is as follows: C(s)+H2O(l)=CO(g)+H2(g) calculate the enthalpy change in the production of 200L(at 500mmHg and 65degree celcius) of hydrogen by this reaction.

    A second-order reaction has a rate constant of 1.65 M–1 s–1. If the initial reactant concentration is 1.0 M, calculate the time (in seconds) required for the reaction to become 90% complete. i got 0.06734 seconds but that's incorrect i have no idea
  57. Chemistry

    What type of reaction occurs when potassiumbromide solution is mixed. With lead(II) acetate solution? Gas evolution, oxidation reduction, precipitation, acid-base neutralization, or no reaction
  58. chemistry

    A laboratory instructor gives you a test tube containing Ag+ ,Ba 2+ , and Cu 2+ ions. Devise a reaction scheme that would allow you to selectively precipitate each of these ions. Write a balanced net ionic equation for each precipitation reaction.
  59. Chemistry 104

    The reaction of hydrogen peroxide, sulfuric acid and lead results in the production of lead sulfate in an acidic aqueous solution. Write the balanced equation for this reaction.
  60. science(chem)

    How many mg of fluorenone can 0.53mol of sodium borohyride(NaBH4) reduce? ~I don't know how to get this..wouldn't I have to have a reaction equation given to me?? Well I didn't have one for the question given to me so I don't know what to do. I tried
  61. Chemistry

    When a mixture of 10.0 g of acetylene and 10.0 g of oxygen is ignited, a complete combustion of the reactants takes place. What is the limiting reagent of this reaction? How many grams of each of the reactants and products are present at the end of the
  62. chemistry

    Consider the combustion reaction: C3H8 (g) + 5 O2(g) ---> 3 CO2(g) + 4H2O(g), where triangle symbol H= - 531 kcal/mol. If 6.70 x 10 to the 4th kcal of energy is released in the reaction, How many grams of oxygen were consumed
  63. Chemistry

    Consider the reaction 3CH_4(g)rightarrow C_3H_8(g)+ 2H_2(g). Calculate delta G at 298 K if the reaction mixture consists of 40atm of CH_4, 0.015atm of C_3H_8, and 2.3×10^−2atm of H_2.
  64. organic chemistry

    Instead of using 1-propanol or 2-pentanol, a student decided to conduct the same reaction you did starting with 2,4-dimethyl-3-pentanol. What product(s) would you predict for this reaction? Show a mechanism to account for any products you propose. How do I
  65. Chemistry 101

    Which of the following will not increase the rate of a reaction? a. using a catalyst b.increasing the temperature c. decreasing the concentration of a reactant d. finding a shorter path for the reaction to take place e. increasing the kinetic energy
  66. Biochemistry

    The ΔG°' for the reaction Citrate isocitrate is +6.64 kJmol-1= +1.59 kcalmol-1. The ΔG°' for the reaction Isocitrate α-Ketoglutarate is -267kJmol-1 = -63.9 kcalmol-1 What is the ΔG°' for the conversion of citrate to
  67. Chemistry

    The empirical formula of a group of compounds is CHCl. Lindane, a powerful insecticide, is a member of this group. The molar mass of lindane is 290.8 g/mol. How many atoms of carbon does a molecule of lindane contain?
  68. Grammar and Composition

    1. After the snowstorm subsided, the anxious people shoveled their driveways, sidewalks, and porches. a. this is a simple sentence b. this is a compound sentence c. this is a complex sentence d. this is a compound-complex sentence C 2. After the blizzard,
  69. chemistry

    For a certain reaction, Delta H(not) = -76.8 kj and delta S(not) = -217 j/k. If n =3, calculate E for the reaction at 25degrees celcius.
  70. science

    How is a single replacement reaction different from a double replacement reaction? I am having trouble telling which on is which.
  71. Chemistry

    Is CO + O2 -> CO2 an endothermic or an exothermic reaction? Also, are all combustion reaction endothermic? Thanks in advance.
  72. chemistry

    The reaction A + B to C + D is second order in A and zero order in B. The value of k is 1.10×10−2 M^{-1}\;min^{-1}. What is the rate of this reaction when A}]=0.124 M and B}]=3.89 M?
  73. Chem

    Given the following hypothetical reaction: 2 E(g) + F(g) + G(g) products. If the rate law is: Rate = k[E]2[F]-1, what is the overall order of reaction? 1. a. zero 2. b. first 3. c. second 4. d. third
  74. Chemistry

    NH4Cl(s) → NH3(g) + HCl(g) ΔH°=176 kJ/mol At 25 °C, this reaction has a ΔG° of 91.1 kJ/mol. What is the ΔS° of this reaction?
  75. chemistry

    The reaction A + B to C + D is second order in A and zero order in B. The value of k is 1.10×10−2 M^{-1}\;min^{-1}. What is the rate of this reaction when A}]=0.124 M and B}]=3.89 M?
  76. Chem

    NH4Cl(s) → NH3(g) + HCl(g) ΔH°=176 kJ/mol At 25 °C, this reaction has a ΔG° of 91.1 kJ/mol. What is the ΔS° of this reaction?

    The value of the equilibrium constant for the reaction below is 40.0 at a specified temperature. What would be the value of that constant for the reverse reaction under the same conditions?
  78. Chemistry

    The rate of the following reaction is 0.480 M/s. What is the relative rate of change of each species in the reaction? A+3B=2C
  79. chem intro

    The rate of the following reaction is 0.90 M/s. What is the relative rate of change of each species in the reaction below? A + 3B --> 2C
  80. chemistry

    For the reaction Cl2(g)<-> 2Cl)g) Kp=2.45*10^-7 at 1000K. What is delta G (degrees) for this reaction at 1000K?
  81. type of reaction

    what type of reaction is ammonium nitrate? HNO3(aq) + NH3(l) --> NH4NO3(aq)
  82. Chemistry

    Write balanced reaction for the following metal acid reaction A) Mg and HCI B) Zn and HCI
  83. Chemistry

    What would the equation be for the reaction between potassium permanganate and cyclohexene. I know it's a oxidation reaction but not sure of the equation.
  84. chemistry

    For a certain reaction, Delta H(not) = -76.8 kj and delta S(not) = -217 j/k. If n =3, calculate E for the reaction at 25degrees celcius.
  85. chemistry

    2 NO2(g) N2(g) + 2 O2(g) The ΔH° for the reaction above is -66.4 kJ. The system is initially at equilibrium. What happens if N2 is added to the reaction mixture at constant temperature and volume? The reaction absorbs energy. The reaction releases
  86. (1-17)Chemistry - Science

    Consider the reaction: SO2 (g) + NO2 (g)  SO3 (g) + NO (g) At T = 1000 K, where the reaction is exothermic with an equilibrium constant K = 9.00 If the reaction vessel is instead charged initially with SO3(g) and NO(g), each at a partial pressure
  87. chem- molar weight

    I worked this problem, I would like to know if I did it correctly, I think I missed something, I'm not sure..... When a 20.0 gram sample of an unknown compound is dissolved in 500 grams of benzene, the freezing pointof the resulting solution was observed
  88. chemistry

    For the decomposition of gaseous dinitrogen pentoxide (shownbelow), 2 N2O5(g).....> 4NO2(g) + O2(g) the rate constant is k = 2.8 10-3 s-1 at 60°C. The initial concentration of N2O5 is 1.52 mol/L. (a) What is [N2O5] after 5.00 min? _____mol/L (b) What
  89. Steve help please?!?!

    How many moles of oxygen are produced from the decomposition of 36.7 g of dinitrogen pentoxide? 2N2O5 4NO2 + O2 A. 3.19 mol B. 0.340 mol C. 0.170 mol D. 5.44 mol Hi Steve, I posted this question the other day but really don't know how to answer it. Can you
  90. science

    A substance in a solid at room temperature. It is unable to conduct electricity as a solid but can conduct electricity as a liquid. This compound melts at 755 degrees celsius. Would you expect this compound to have ionic bonds, metallic bonds, or covalent
  91. Chemistry

    Silver oxide is used in small batteries called button batteries (Figure below). It decomposes upon heating to form silver metal and oxygen gas. 2Ag2O(s) → 4Ag(s) + O2(g) How many moles of silver are produced by the decomposition of 4.85 g of Ag2O?
  92. Chemistry

    Would a compound that is soluble in HCl be soluble in NaHCO3? I think that a compound that is soluble in NaOH and not HCl would be soluble in NaHCO3, right? Thanks!
  93. Chemistry

    The thermal decomposition of 1.6608 g of MgSO4 * H2O produces 1.4446 g of a product in a well-behaved reaction. There are two possibilities: 1) MgSO4 * H2O(s) -> MgSO4(s) + H2O(g) 2) MgSO4 * H2O(s) -> MgO(s) + SO3(g) + H2O(g) Complete the following
  94. Chemistry Dr. BOB

    I don't get it!! In winemaking, the sugars in grapes undergo fermentation by yeast to yield CH3CH2OH and CO2. During cellular respiration, sugar and enthanol are "burned" to water vapor andCO2. Write a combustion reaction for ethanol. I need help with
  95. chemistry

    In an effort to purify the output from a catalytic chemical reaction, C-Cl bonds are to be broken in a gaseous compound by means of LASER radiation. Determine the longest wavelength of radiation still capable of breaking the C-Cl bond. Express your answer
  96. chemistry

    ) Choose the correct integrated rate law for each reaction order. (Enter only the letter to the left of the correct response.) Reaction Order Answer zero d first c second a a. l/[A]t = kt + l/[A]0 b. log[A]t = kt +log[A]0 c. ln[A]t = –kt + ln[A]0 d. [A]t
  97. Chemistry

    What is the molar heat of reaction? When 0.732 g of Ca metal is added to 200.0 mL of 0.500 M HCl(aq), a temperature increase of 119C 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.
  98. science(chemistry)

    I have a question about TLC plate solvents. What solvents will leave stains on a plate with a TLC plate out of the ones below and why?) (n-Octane, n-Hexane, Decane, Acetone, 1-Propanol, 2-Propanol, Ethanol, Toluene, Cyclohexane, Methanol, n-Heptane,
  99. Chemistry

    A solution contains H2O2 in water. Complete decomposition of the H2O2 in 170 g of this solution yields 5.6 L of O2(g), measured at 0 oC and 101.325 kPa. What is the percentage by mass of H2O2 in this solution? Choose the closest answer. A 10% B 20% C 5.0%
  100. english

    She folds some of the clothes she has already ironed, and crosses to the bed with them.” What impression do we get of the character in the above stage directions? She is bored with her current circumstances She is too busy to worry about housework She is