1. chemistry characterization & analysis of aspirin

    write a balanced equation that describes an acid base reaction that would allow you to determine the moles of aspirin present in a sample

    asked by molly on November 13, 2012
  2. Chemistry

    In a coffee cup calorimeter, 50.00 mL of HNO3 (aq) and 50.00 mL of KOH(aq) were mixed. The temperature of the resultant solution increased 6.5 C. What is the Delta H of this reaction?

    asked by Jaime on April 9, 2012
  3. chemistry

    the thermal decompostion of 26.4g of CaCo3 produced10.6g calcium and 3.17g carbon. calculate the mass of oxygen produced in this reaction.

    asked by Mary on February 13, 2011
  4. Chemistry

    For the following chemical reaction HCN(aq)+KOH(aq)--->H2O(l)+KCN(aq) Write the net ionic equation, including the phases.

    asked by Ann on April 4, 2016
  5. Chemistry

    The rate constant fo a particular reaction increases by a factor of 6.5 when the temperature is increased from 300.0K to 310.0K. Calculate the activation energy.

    asked by Anonymous on December 26, 2010
  6. Chem-help

    What mass of precipitate will form if 1.50 L of concentrated Pb(ClO3)2 is mixed with 0.750 L of 0.290 M NaI? Assume the reaction goes to completion.

    asked by Anonymous on July 7, 2012
  7. Chemisty

    The value of ∆Ho for the reaction below is -1107 kJ: 2Ba(s) + O2(g) → 2BaO(s) How many kJ of heat are released when 15.75 g of Ba(s) reacts completely with oxygen to form BaO(s)? A) 35.1 B) 114 C) 70.3 D) 20.8 E) 63.5

    asked by Jenny on September 17, 2013
  8. Chemistry

    Zinc reacts with hydrochloric acid according to the reaction equation... Zn (s) + 2HCl (aq) ---> ZnCl2 (aq) + H2 (g) How many milliliters of 5.00 M HCl (aq) are required to react with 5.55 g of Zn (s)??

    asked by Chelsea on October 5, 2013
  9. chemistry

    if the activation energy for a given compound is found to be 10 kJ/mol, with a frequency factor of 4.0x10^13 s-1, what is the rate constant for this reaction at 398K?

    asked by hall on February 26, 2012
  10. chemistry

    Determine the actual values for the standard change in entropy for the following reaction. NH3(g) + HCl(g) NH4Cl(s) do I use the delta G equation?

    asked by whyyy on October 26, 2011
  11. chemistry

    Express the rate of the reaction in terms of the change in concentration of each of the reactants and products. 2D(g)+3E(g)+F(g)>>>>2G(g) + H(g) when D is decreasing at 0.30 MOL/Ls, how fast is (H) increasing?

    asked by andrew on September 8, 2014
  12. chemistry

    Ni+4CO=NI(CO)4 this reaction separates nickel from other solid impurities.Starting with 86.4g NI,calculte the pressure of NI(CO)4 in a container of volume 4.00L

    asked by silly on November 28, 2010
  13. Chemistry

    A reaction at 2.43 atm produces 20.0 L of a gas and evolves 75.3 kJ of heat (exothermic). Calculate the change in internal energy of the system (in kJ).

    asked by JUNDY on March 31, 2015
  14. Chemistry

    Consider this reaction N2g+O2g+2NOg H=180.5kj How much heat would be required to produce 1.300 mol NOg?

    asked by Sarah on May 19, 2016
  15. chem

    write the net ionic equation for the unknown titration reaction in this experiment. KHC8H4O4(aq) + NaOH(aq)----> KNaC8H4O4 + H2O(l)

    asked by natash on April 8, 2008
  16. chem

    Given: 3H2(g) + N2(g) 2NH3(g) If the reaction starts with 0.500 mol of H2, how many atoms of hydrogen in the compound NH3 would you expect to make?

    asked by kp on February 14, 2010
  17. Science

    1) Why is photosynthesis and example of a chemical reaction, and why is it classified as endothermic? 2) how do everyday activities like driving a car using electricity less to global warming?

    asked by I’m dumb on October 30, 2018
  18. chemistry

    the following reaction consumes 2.6kg of CO(g): CO(g) + H2O(g) --> CO2(g) + H2(g) how many total liters of gas are formed if the products are collected at STP?

    asked by chaz on July 30, 2012
  19. chemistry

    consider the following reaction: 2C2H6(g)+7O2 (g)-->4CO2(g)+6H2O (g) delta H = -3120kJ If 3.00g of ethane are burned, how many kJ of heat are produced?

    asked by madison on January 14, 2011
  20. Chemistry 112

    Can someone please explain to me how to calculate reaction order with respect to something? I've read this in my textbook, and I watched videos on YouTube, but I still don't understand. Please help.

    asked by Aiyana on January 30, 2017
  21. Chemistry

    what mass of water will be formed by reaction of 3.50g of methylamine (8CH3NH2) with 15.0g of perchloric acid (13HClO4)? Answer is 99.1. How do you work this?

    asked by Michelle on November 7, 2012
  22. ap chemistry

    Find the equilibrium constant for the reaction Cr(s) + Zn2+(aq)→Cr2+(aq) + Zn(s) if the standard cell emf is −0.76 V at the cathode and −0.91 V at the anode. RT - F= 0.025693 V

    asked by Gabriella on September 28, 2013
  23. chemistry

    How many grams of hydrogen are released by the reaction of 1.00 g of aluminum with excess potassium hydroxide solution assuming 100% yield

    asked by juan on March 12, 2015
  24. Chemistry

    The equilibrium constant for the reaction: 2NO(g)+Br2(g)2NOBr(g) Kc=1.3x10^-2 at 1000 Kelvin Calculate Kc for: NOBr(g)NO(g)+ 1/2Br2(g)

    asked by Colin on February 26, 2012
  25. chemistry

    In a certain chemical reation, two reactants undergo change to form two products. Why can't you determine what type of reaction occurred from this information?

    asked by Bubba on November 26, 2008
  26. chemistry

    Use Hess's Law and a table of heats of formation to determine the enthalpy for the following reaction. 3SO2(g) + 3H2O(g) + 3/2O2(g) --->3H2SO4(l) ΔH = ?

    asked by korko on September 28, 2014
  27. Chemistry

    How many molecules of Cl2 would be formed from the reaction mixture that produces the greatest amount of products? 4HCl + O2 --> 2H2O + 2Cl

    asked by Jennifer on October 4, 2010
  28. Chemistry

    What mass of precipitate will form if 1.50 L of concentrated Pb(ClO3)2 is mixed with 0.750 L of 0.170 M NaI? Assume the reaction goes to completion.

    asked by bella on February 17, 2013
  29. chemistry

    Whatis the chemical name of the substance formed in the slow reaction that takes place when iron filings are mixed with water?

    asked by B on September 13, 2008
  30. chemistry

    Find the equilibrium constant for the reaction Cr(s) + Zn2+(aq) → Cr2+(aq) + Zn(s) if the standard cell emf is −0.76 V at the cathode and −0.91 V at the anode. R T F = 0.025693 V

    asked by jack hoff on October 6, 2015
  31. APChem

    does anyone know a good website i could look at so i could answer this question: ? Explain how indicators work using a chemical reaction as part of your explanation. Any websites? please? thank you!!

    asked by Kiki on February 28, 2010
  32. chem.

    What mass of precipitate will form if 1.50 L of concentrated Pb(ClO3)2 is mixed with 0.700 L of 0.240 M NaI? Assume the reaction goes to completion.

    asked by mee on May 21, 2016
  33. chemistry

    What is the activation energy for a reaction whose rate is tripled by a temperature increase from 28 to 53 C? I understand that I have to use the arrhenius equation, but how do I set it up for a problem like this?

    asked by Jeena on March 15, 2010
  34. chemistry

    calculate the number of grams of Al2S3 which can be prepared by the reaction of 20g of Al and 30gm of sulphur. how much the non_limiting reactant in excess?

    asked by Ahsan on May 6, 2016
  35. chemistry

    Use Hess's Law and a table of heats of formation to determine the enthalpy for the following reaction. 3SO2(g) + 3H2O(g) + 3/2O2(g) --->3H2SO4(l) ΔH = ?

    asked by korko on September 28, 2014
  36. chemistry

    Al2O3(s)+6NO(g)---->5N2(g)+6H2O(l) how many grams of Nitric Oxide are required to produce 145g of nitrogen in the following reaction?

    asked by Mandy on February 28, 2012

    What mass of AgCl(143.32g/mol) is formed from the reaction of a 0.109 M MgCl2 solution with excess AgC2H3O2?

    asked by lIZ on February 29, 2016
  38. Chemistry

    Consider the following equilibrium at 395K: NH4HS(s) NH3(g) + H2S(g) The partial pressure of each gas is 0.265 atm. Calculate Kc for the reaction.

    asked by Susan on February 19, 2013
  39. Chemistry

    How many moles of NaBH4 are needed to generate one mole of B2H6 if the reaction gives an 80% yield? 3NaBH4 +4BF3 ¨ 3NaBF4 + 2B2H6

    asked by Dan on April 8, 2010
  40. Chemistry

    How much heat (in kilojoules) is evolved or absorbed in the reaction of 2.65 g of Na with H2O? 2Na+2H2O ---> 2NaOH + 2H2 Delta H= -368.4

    asked by Anonymous on February 17, 2010
  41. chem

    What volume of benzene (C6H6,d=0.88g/ml,molar mass=78.11g/mol) is required to produce 1.5 x 10^3 kJ of heat according to the following reaction?

    asked by Melissa on November 18, 2013
  42. english

    Select the vocabulary word that best completes the sentence. Most people learn best when they can follow a(n) _[blank]_. example influence state reaction A?

    asked by Bri on August 1, 2018
  43. chemistry

    if 15 grams of ethane gas c2h6, reacts with 128 g oxygen un a combustion reaction, how many moles of water can be produced?

    asked by jen on February 1, 2016
  44. Chemistry- please help!!

    The following reaction occurs in an aqueous acid solution: no3- + I- -> IO3- + NO2 In the balanced equation, the coefficient of water is A. 4 B. 3 C. 1 D. 5 E. 2

    asked by Charleze on May 23, 2010
  45. Chemisry

    What is the minimum amount of 5.2M H2SO4 necessary to produce 22.8g of H2 (g) according to the following reaction? 2Al(s)+3H2SO4(aq)→Al2(SO4)3(aq)+3H2(g) (Please be precise and clear)

    asked by Tyler Jones on February 11, 2014
  46. Chemistry

    In the reaction Al2S3(s) + 6HCl(aq) --> 2AlCl3(aq) + 3H2S(g), how many moles of HCl are used for each mole of AlCl3 formed? A.0 B.2 C.3 D.1 E.1.5 where do you start and how do you figure it out?

    asked by Rose on December 14, 2017
  47. social studies

    Identify two reasons that explain why Britain and France thought that the policy of appeasement was the best solution as a reaction to Hitler's demands.

    asked by Carly on October 27, 2008
  48. chemistry

    what is a titration, what is the type of reaction to find the volume of hydrochloric acid needed to react with 25 of potassium hydroxide solution

    asked by bee on May 4, 2013
  49. Chemistry

    Calculate the cell potential for the following reaction as written at 25.00 °C, given that [Cr2 ] = 0.875 M and [Ni2 ] = 0.0100 M. I keep on getting the answer .42 which is incorrect. Thank you so much in advance!

    asked by Julia on April 24, 2017
  50. chemistry

    Choose the term that best describes the following chemical reaction: C10H8 + 12 O2 10 CO2 + 4 H2O A. synthesis B. combustion C. electrolytic D. decomposition

    asked by ashley on November 29, 2011
  51. Chemistry

    Consider the reaction below : P4(s) + 5O2(g) ---> P4O10(s) How many grams of phosphorus react with 4.745 x 10^1 L of oxygen at STP to form tetraphosphorus decaoxide?

    asked by Brooke on July 29, 2011
  52. 11th grade

    what is the chemical reaction equation for : Hydrogen sulfite reacts with oxygen to form sulfur dioxide and water vapour.

    asked by Cats on May 24, 2010
  53. Chm

    If we increased the amount of acetic acid and sodium bicarbonate to 2.0 moles, what effect would this have on the reaction? The enthalpy change? Explain

    asked by Lorraine on July 30, 2016
  54. Chemistry

    For a certain reaction, the activation energy is 52.1 kJ/mole. By what ratio will the rate constant change if the temperature is decreased from 175C to 75C?

    asked by Whitney on February 19, 2015
  55. Chemistry

    1)In the reaction O2+2F2--> 2 OF2, F2 is the oxidizer. 2)F can't have positive oxidation states. Does 2 explains the reason for the 1st one or is it because because of F's higher electronegativity?

    asked by Shenaya on August 1, 2017
  56. chemistry

    If 150.0 f of sulfuric acid is spilled, what is the minimum number of moles of sodium carbonate have to be added to complete reaction

    asked by rose on October 31, 2010
  57. chem 1411

    what mass of H2 is produced by the reaction of 118.5 mL of a 0.8775M solution of H3PO4 according to the following equation: 2Cr+2H3PO4= 3H2+2CrPO4

    asked by JACI WINLOW on October 18, 2016
  58. CHEM 1411

    What mass of Gallium chloride is formed by the reaction of 2.6 L of a 1.44 M solution of HCl according to the following equation: 2Ga+ 6HCl= 2GaCl3+3H2

    asked by JACI WINLOW on October 18, 2016
  59. physical science

    Help please. Aisha drops an antacid tablet in water and times how long it takes to dissolve. Which of the following will decrease the reaction rate?

    asked by Brittany on March 22, 2013
  60. science, chemistry

    Separate this redox reaction into its component half-reactions. O2+2Cu---->2CuO thought it was: Oxidation 2e-+O2---->2O(-2) Reduction Cu---->Cu(2+)-2e- but this is wrong

    asked by Cari on November 30, 2012
  61. Chemistry

    What is the value of the equilibrium constant at 25°C for the reaction between each of the following? (a) Sn(s) and Pb2+(aq) (b) Cr(s) and Cu2+(aq) I have been unable to get either and have spent the last two hours attempting it. I have been using the

    asked by Caroline on May 4, 2015
  62. Chemistry

    I need to know how to right a net ionic equation for the following chemical reaction: 5 H2C2O4 + 3 H2SO4 + 2 KMnO4 = K2SO4 + 2 MnSO4 + 8 H2O + 10 CO2

    asked by Matthew on April 14, 2011
  63. Chemistry

    SO2(g) + O2(g) → SO3(g) What volume of sulfur dioxide gas reacts with 15.0 L of O2? The reaction conditions are 875°C and 1.00 atm pressure

    asked by Harry on February 2, 2014
  64. Chemistry

    3NO2(g) + H2O(l) → 2HNO3(aq) + NO(g) standard enthalpy: -133.5 Find the change in internal energy for this reaction. Enter in kJ.

    asked by Rachel on October 22, 2014


    asked by Maria on September 15, 2016
  66. science

    calculate the volume of gas at STP that is produced when 1g of silver nitrate is heated. the unbalanced reaction is: AgNO3(s)=Ag(s)+NO2(g)+O2(g)

    asked by Mahlako on May 18, 2015
  67. Chemistry

    Balance? Cr2O7^2- + C2H4O yields C2H4O2 + Cr^3+ (When I say ^ a number followed by a plus or minus that's the charge) Half-reaction method needed.

    asked by Alex on October 11, 2010
  68. chemistry

    What is delta Hrxm dagrees for the following chemical reaction? CO2(g)+2KOH(s) = H2O(g)+K2CO3(s) Express your answer in numerically, in kJ

    asked by Lilit*** on October 20, 2008
  69. Chemistry

    Write a balanced equation showing how you could prepare each of the following salts from an acid-base reaction: KNO3, NaBr, CaS.

    asked by Stacey on April 5, 2011

    Na2CO3 write the hydrolysis reaction for the salts. Dissociate the salt into cation and anion and ignore inert species

    asked by BUNNIE on April 5, 2011
  71. chemistry

    What volume of 16M HNO3 is required to dissolve 0.50g of Cu metal in the following reaction? Cu(s) + 4HNO3(aq) ---> Cu(NO3)2 + 2H2O + 2NO2

    asked by Alex on February 4, 2011
  72. Chemistry

    What happens if sodium acetate (CH3COONa) is added to the following reaction? CH3COOH  H+ + CH3COO- a) [H+] increases b) [H+] decreases c) a precipitate is formed d) [H+] does not change

    asked by scilover on May 20, 2013
  73. chemistry

    How many grams of Nitric oxide are required to produce 145g of nitrogen in this reaction: Al2O3(s)+6NO(g)---->5N2(g)+6H2o(l)

    asked by mandy on November 17, 2011
  74. chemistry

    write a balanced chemical equation for the process of photosynthesis and the conditions of the reaction giving physical state of all the substances

    asked by aakriti on June 15, 2015
  75. Chemistry

    how could you maximize the rate of reaction of magnesium and hydrochloric acid other than concentration and surface area techniques.tell a experiment in short.

    asked by Anjan on April 14, 2011
  76. organic chemistry

    what is the major and minor product of 3-methyl 1-pentene + propanol reacted with sulfuric acid?! Detailed mechanism reaction please?? Thank you!

    asked by jamie on May 19, 2010
  77. Chemistry

    What type of reaction is photosynthesis, the process where carbon dioxide combines with water to form glucose in the presence of sunlight?

    asked by josie on June 18, 2014
  78. chemistry

    write a balanced net ionic equation for the overall reaction represented by the cell notation below. Pt/ Fe2+, Fe3+ // I-/AgI/Ag

    asked by Lana on May 12, 2013
  79. Chemistry

    The first order reaction has a rate constant of 3.0x10^-3 s^-1. The time required for the r eaction to be 75% complete is: 95.8s 201s 231s 462s 41.7s

    asked by Sam on February 22, 2008
  80. chemistry

    Read the scenario. Hydrogen chloride (HCl) and potassium hydroxide (NaOH) react. What products are formed from this reaction?

    asked by PLEASE help on September 14, 2017
  81. Physical Science

    Predict the shift of equilibrium for each of the following conditions in the following reaction involving gaseous reactants and products: N2 + 3H2 = 2NH3 + heat

    asked by Ed on February 8, 2013
  82. Chemistry

    Sulfur dioxide gas is bubbled through sodium hydroxide solution Write the balanced formula equation for this reaction

    asked by Janie on April 12, 2011
  83. Chemistry

    Please help !!!! Is anyone know what are two side reactions that could occur in the Diels-Alder Reaction of Cyclopentadiene with Maleic Anhydride in addition to the main product? Thanks

    asked by Amanda on February 10, 2010
  84. stoichiometry

    How many grams of Nitric oxide are required to produce 145g of nitrogen in this reaction: Al2O3(s)+6NO(g)---->5N2(g)+6H2o(l)

    asked by mandy on November 17, 2011
  85. Chemistry ( I NEED HELP REAL QUICK )

    How much Al is needed to react with 675 mL of 0.655M HCl solution according to the reaction => 2Al + 6HCl→2AlCl3+ 3H2 Help your friend!

    asked by Farrell on May 25, 2015
  86. Chemistry

    Write a balanced chemical equation that represents the reaction between methane and hydrochloric acid. CH4+HCl-> I'm not quite sure what happens...help please? Thanks in advance!

    asked by Cicilia on June 7, 2012
  87. Chemistry

    Write the balanced chemical equation for the reaction of the weak acid HCN with water. Include the phase of each species.

    asked by NA on September 3, 2015
  88. chemistry

    If the half-life of a first-order decomposition reaction is 24.2 minutes, how long will it take for 10.0 moles of the reactant to decompose so that only 2.5 mol remains?

    asked by Josh on September 4, 2012
  89. children graowing up

    the final stage in an acute distress reaction prompted by separation is often ? a.dispair b.detachment c.resentment d.protest my answer is b

    asked by susue on July 29, 2013
  90. Chemistry

    NaOH+HNO3---> NaNO3+H2O calculate the number of moles of every ion present in solution after the reaction has occurred.

    asked by Hiba on September 15, 2010
  91. 7th grade

    A Pyrotechician is working on a new fourth of July rocket. He is using a highly reactive metal when burned. What can he use to lower the reaction rate????

    asked by Anomynous on January 14, 2010
  92. chemistry

    Complete and balance the displayed half reaction in neutral aqueous solution taking into account the electrons. Mg(s) → Mg2+(aq)

    asked by andy on June 2, 2010
  93. Social studies

    What was the response by the states to Andrew Jackson's reaction to the Supreme Court decision in favor of the Cherokee in Worchester v. Georgia?

    asked by Anonymous on March 23, 2018
  94. chemistry

    give the full, ionic and net equations for the reaction (if any) that occurs when aqueous soulutions of Na2CO3 and MgCl2 are mixed.

    asked by Kayla on July 4, 2011
  95. Chemistry

    Write a net ionic equation for the reaction that occurs when excess hydrobromic acid (aq) and sodium sulfide are combined.

    asked by Sarah on September 24, 2017
  96. Chemistry

    For the reaction HCl + NaOH → NaCl + H2O, how many moles of hydrochloric acid are required to produce 281.0 g of water?

    asked by Andrew on October 31, 2016
  97. Chemistry

    In the reaction Ca(OH)2 + 2HCL -> CaCl2 + 2H2O: How many kilograms of H2O will be produced when 0.0948 Kg of Ca(OH)2 react with excess hydrochloric acid?

    asked by Ana on April 9, 2015
  98. chemistry

    What mass in kg of NH3 must be used to produce 4.4 multiplied by 106 kg HNO3 by the Ostwald process, assuming 100% yield in each reaction?

    asked by Kris on August 1, 2013
  99. chemistry

    One of the by-products of a reaction is 2-methyl-2-butene. A) Suggest a mechanistic pathway for the formation of this alkene. B) How is this by-product removed during the purification?

    asked by Aly on October 28, 2011
  100. chem

    IF a reation generally takes 40 seconds to occur at 45 degrees C, how long should the reaction take a t the following temperatures? A. 35C B. 55C C. 65C

    asked by john on January 18, 2012