1. 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 27, 2010
  2. 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
  3. Genral Science

    What C word defines a substance that speeds a chemical reaction without being consumed? http://en.wikipedia.org/wiki/Catalysis

    asked by stuart on March 28, 2007
  4. 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
  5. 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
  6. 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
  7. 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
  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 4, 2013
  9. 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 27, 2013
  10. 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
  11. 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 July 31, 2017
  12. Chemistry

    Write a net ionic equation for the reaction that occurs when cobalt(II) carbonate (s) and excess hydroiodic acid are combined.

    asked by stone on September 29, 2017
  13. Chemistry

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

    asked by Chelsea on October 4, 2013
  14. 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
  15. 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 8, 2012
  16. 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 25, 2011
  17. CHEMISTRY

    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
  18. 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
  19. 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
  20. Chemistry

    In H2SO4 + 2NaOH = 2H2O + Na2SO4 How much of the excess reagent will remain after the reaction has been completed? I know that NaOH is the limiting reactant

    asked by Anonymous on April 5, 2018
  21. chemistry

    why would acyl halides give higher yields of amides compared to carboxylic acids or esters on reaction with NH3?

    asked by jen on March 30, 2018
  22. Chemistry

    When you mix sodium bicarbonate and calcium chloride with bromothymol (and indicator that changes color when a chemical reaction occures) what does it create?

    asked by Geoff on September 15, 2011
  23. 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
  24. 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
  25. chemistry

    Given the following data: 4PCl5(s) ¨ P4(s) + 10Cl2(g) ƒ¢H = +1774 kJ P4(s) + 6Cl2(g) ¨ 4PCl3(l) ƒ¢H = -1278.8 kJ Find the ƒ¢H of the following reaction: PCl5(s) ¨ PCl3(l) + Cl2(g)

    asked by Hi on March 3, 2015
  26. 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
  27. 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
  28. 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
  29. 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 3, 2010
  30. 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 18, 2015
  31. 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
  32. 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
  33. 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
  34. 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 19, 2013
  35. organic chemistry

    assuming the reaction goes to completion, calculate the volume of 6M KOH needed to completely neutralize all of the hydrogen bromide formed.

    asked by Scisi on September 29, 2010
  36. 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
  37. chemistry

    my ques is 2Fe2S3+3O2+6H2O-4Fe(OH)3+6S THIS REACTION WRIGHT ,WRONG PLZ JUST REPLY I AM WAIT FOR YOUR ANSWER.

    asked by zeba razi on August 23, 2013
  38. 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 13, 2017
  39. 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
  40. 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
  41. Translation

    I am in a translation class and the sentence contains this phrase can you tell me what it means The city was brutal in its reaction wiping 50 3/4p off the share price what does 50 3/4p stand for

    asked by John on November 2, 2011
  42. chemistry

    What mass of precipitate will form if 1.50 L of concentrated Pb(ClO3)2 is mixed with 0.150 L of 0.190 M NaI? Assume the reaction goes to completion.

    asked by jackson on November 17, 2014
  43. 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
  44. 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
  45. 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
  46. chemistry

    A sample of cesium metal reacted completely with water, evolving 47.0 mL of dry H2 at 31°C and 769 mmHg. What is the equation for the reaction?

    asked by Jessica on December 13, 2011
  47. World History

    Generally peasants and the lower castes had a more positive reaction to the teachings of the Buddha, since Buddhists did not support the concept of a ________.

    asked by Rachel on November 15, 2012
  48. 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 January 31, 2016
  49. HCA 220

    can someone explin how blood clotting, immune response, allergic reaction, and hormone release interrelate. I have been searching and can't find anything

    asked by lulu on May 1, 2011
  50. Chem

    Question 11 Marks: 4 Consider the equilibrium of water with gaseous hydrogen and oxygen: Give the value of for this reaction, if it is written as: Choose one answer. a. -7.8 x 10^-16 b. -3.9 x 10^-16 c. 1.3 x 10^-15 d. 6.4 x 10^-14 e. 3.6 x 10^2

    asked by CAA on March 25, 2010
  51. 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
  52. 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
  53. 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
  54. 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
  55. 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
  56. 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 9, 2010
  57. chemistry

    Complete, Balance and classify the chemical reaction....please help do not understand A)Li(s)+AuCL3(aq)-> B)AL(NO3)(aq)+K2CO3(ag)-> C)Ba(s)+F2(g)-> D)SnCI2(aq)+Na3PO4(aq)-> E)Na+AICI3(s)->

    asked by twynna on February 28, 2011
  58. 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
  59. 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
  60. english

    the author of my brothers keeper mainly develops jamies character through A. his actions b.dialogue and thoughts c.the narrators description d.others reaction to him

    asked by ciara on September 11, 2015
  61. 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
  62. 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
  63. Chemistry

    Write a balanced net ionic equation (include physical states) for the following reaction: Fe(NO3)3(aq) + LiOH(aq) → LiNO3(aq) + Fe(OH)3(s)

    asked by Emily on June 27, 2011
  64. 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 3, 2016
  65. CHEMISTRY

    BALANCE THE REDOX REACTION USING HALF CELL METHOD IN AN ACIDIC MEDIUM CHCl3 + MnO4- = Cl2 + CO2 + Mn+2

    asked by Maria on September 15, 2016
  66. chemistry

    Consider the following equations. For each, decide whether it represents a chemical reaction or a physical change. a. SnCl4(aq) + 4H2O(l)  Sn(OH)4(s) + 4HCl(aq) b. 4K(s) + O2(g)  2K2O(s) c. NaCl(s)  Na+(aq) + Cl-(aq)

    asked by ABCD on July 3, 2011
  67. 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 21, 2014
  68. 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
  69. 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 6, 2012
  70. 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
  71. chemistry

    If, in the reaction below, 31 g of C4H10 produces 41 41 g of CO2, what is the percent yield? Assume that the one reactant is limiting. 2C4H10 + 13O2 + 10H2O

    asked by Rosa on January 6, 2013
  72. 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
  73. chemistry

    Could you please tell me the objective, theory and mechanism,result, precautions and applications of following experiment : reaction of 4-aminotoluene and o-vanillin(preparation of azomethine)

    asked by Edward on August 3, 2015
  74. chemistry

    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 LUNGILE on March 4, 2016
  75. CHEMISTRY

    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 LUNGILE on March 4, 2016
  76. 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
  77. 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
  78. 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 13, 2011
  79. 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 7, 2008
  80. 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 Cami on January 4, 2013
  81. 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 25, 2010
  82. chem

    Consider the chemical reaction, 2Al + 3Cl2 → 2AlCl3. Here, 56 g of Al can produce 415.14 g of AlCl3 (Molar masses: Al = 26.98 g; Cl = 35.45 g). true or false

    asked by bekah on October 4, 2014
  83. CHEMISTRY!!

    1) How would you prepare 20 mL of a solution having pH = 2.00 by dilution of 0.10 M HCl? 2) The Ka, for hypochlorous acid, HClO, is 7.2 x l0^–4 at 25°C. What is pKa? Write the equation for the reaction to which Ka applies.

    asked by jess on October 25, 2015
  84. 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
  85. 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 29, 2012
  86. 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 5, 2015
  87. 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 19, 2008
  88. 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 30, 2010
  89. 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
  90. chemistry

    For the oxidation- reduction reaction equation given here, 2Na+S -> Na2S indicate how many electrons are transferred in the formation of one formula unit of produce.

    asked by Anonymous on April 29, 2016
  91. chemistry

    Zinc reacts with hydrochloric acid according to the reaction equation Zn(s)+2HCL(aq)=>ZnCl2(aq)+H2(g). How many mm of 1.50M HCL(aq) are required to react with 9.05 g of ZN?

    asked by Mimi on August 9, 2012
  92. 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
  93. 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
  94. chemistry

    What would Qc be if the volume of the container decreased by a factor of 1.774 for the following reaction? PH3(g) + BCl3(g) → PH3BCl3(s) KC = 534.8 at 353.0oC

    asked by Andy on May 6, 2014
  95. 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
  96. 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 20, 2016
  97. 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 14, 2010
  98. 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
  99. 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
  100. 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 29, 2016