1. Half-Life

    The rate constant for this first-order reaction is 0.0990 s–1 at 400 °C. A --> products After how many seconds will 10.0% of the reactant remain?

    asked by Sam on September 22, 2015
  2. chemistry

    Silver is electroplated at the cathode of an electrolysis cell by 1/2 reaction Ag(aq) + e- --> Ag(s). How many moles of electrons are required to electroplate 5.8g of Ag?

    asked by Ashley on November 30, 2011
  3. Chemistry

    Please help me answer the question: What does it mean Write a net ionic equation for the reaction 2HCl + Ca(OH)2 -> CaCl2 + 2H20

    asked by Brittany on November 19, 2009
  4. Chemistry

    How do I find the POtential Energy for a reaction from strontium chloride and potassium carbonate? and what is the chemical reactions for the above

    asked by SBB on December 1, 2011
  5. Chemistry

    in a neutralization reaction, dilute tetraoxosulphate (vi) acid completely reacted with sodium hydroxide solution

    asked by Archie on February 9, 2016
  6. organic chemistry

    Predict the relative rates for the reaction of butadiene and (a) ethene, (b) methyl propenoate, (c) maleic anhydrid.

    asked by cindy on May 21, 2009
  7. chemistry

    Kp for the reaction CO2(g) + C(s) 2CO(g) is 1.47 at 727°C. Calculate Kc at this temperature Answer A. 0.0179 B. 0.0246 C. 121 D. 87.7 E. 1.47

    asked by ken on July 22, 2012
  8. chemistry

    find mass of sulfuric acid obtained in reaction of 20.0g if sulfur trioxide with excess of water

    asked by Allison on March 10, 2015
  9. english

    How might readers react if the topic sentences in an essay did not coincide with the supporting points, and why would their reaction be justified?

    asked by richard on March 28, 2011
  10. Chemistry

    How many liters of hydrogen at STP can be produced by the reaction of 4.15 g of zinc with hydrochloric acid: Zn + 2HCl -> ZnCl2 + H2

    asked by Christina on November 9, 2009
  11. Chemistry

    How much heat (in kilojoules) is evolved or absorbed in the reaction of 3.35 of with enough carbon monoxide to produce iron metal?

    asked by LaK on December 11, 2012
  12. Chemistry

    How many liters of hydrogen at STP can be produced by the reaction of 4.15 g of zinc with hydrochloric acid: Zn + 2HCl -> ZnCl2 + H2

    asked by Julie on November 9, 2009
  13. chemistry

    How do you write a balanced equation for the preparation of phenylmagnesium bromide and it's reaction with benzophenone followed by neutralization in acid?

    asked by Anonymous on November 9, 2014
  14. chemistry 12

    what is the chemical formula for the reaction between lead acetate and potassium iodide? please show both reactants and products. :)

    asked by need help on September 6, 2008
  15. Chemistry

    Right, for the reaction of hot sodium hydroxide plus chlorine , how come one of the products are 5NaCl and not Na5Cl seeing as we now know the oxidation state of cl is -5

    asked by Patel on January 5, 2013
  16. chemistry

    Which term in the following reaction would not be included in the equilibrium expression? 2 Na3PO4 (aq) + 3 MgCl2 (aq) → 2 Mg3(PO4)2 (s) + 6 NaCl (aq)

    asked by barbra on November 5, 2010
  17. AP Chem

    A first-order reaction has a rate constant of 0.547 min - 1. How long will it take a reactant concentration 0.14 M to decrease to 0.07 M? Not sure how to do this!

    asked by Andrea on March 5, 2018
  18. chemistry

    Ca(s) + Br2(l) --> CaBr2 is synthesis my teacher also said that the cause of the reaction is stable electron configuration is that the same thing as the electrolytes one

    asked by lyne on January 21, 2009
  19. Chemistry

    When the oxidation-reduction reaction shown here is balanced, how many electrons are transferred for each atom of copper that reacts? Ag^+ + Cu = Ag + Cu^2+

    asked by Danielle on June 26, 2012
  20. Chem - Stoichiometry

    How many grams of sodium carbonate is required for a complete reaction with 1.00g of calcium chloride dihydrate? Help!

    asked by Erin on October 18, 2009
  21. Chemistry

    What mass of glucose can be produced from a photosynthesis reaction that occurs using 21.2 mol CO2? Answer in units of g

    asked by John on January 21, 2013
  22. chemistry

    given the following data: S(s)+3/2 O2(g)->SO3(g) H=-395.2 kj 2SO2(g)+ O2(g)->2SO3(g) H=-198.2kj calculate H for the reaction S(s)+ O2(g)->SO2(g)

    asked by rame on April 25, 2012
  23. chem

    Please explain: 1) if MnO2 when in a fast reaction with H2O2 appear in balanced equation and 2)purpose of manganese dioxide. Thanks

    asked by bell on April 25, 2015
  24. CHEM-HELP!!!!

    8. 2(NH4)3PO4--> 3N2+ O2+ 12H2+ 2PO3 a)name products b)Name the reactant c)type of reaction this is the only info that is given///thank you

    asked by ALEX on June 8, 2009
  25. Living a Healthy Life

    A child's ability to jump for distance is an example of A. flexibility. B. explosive power. C. reaction time. D. agility. B.

    asked by Amanda on November 22, 2014
  26. Chemistry

    How many grams of PI3 could actually be produced from 250 g of I2 and excess phosphorous if the reaction gives a 98.5% yield? P4 + 6I2 --> 4PI3

    asked by Anonymous on February 26, 2012
  27. PHYSICS

    What is the reaction effect of the following action effects? a) Earth orbits the sun b) Ball accelerates downward Thank YOu.

    asked by JJ on November 21, 2010
  28. Heat

    Consider the following equation: CO + 2 H2 → CH3OH ΔH rxn = -128 kJ Calculate the amount of heat (in kJ) associated with complete reaction of 8.08 g H2. How would u set that up?

    asked by Chemistry on April 19, 2015
  29. Chemistry

    In the first order, reaction A yields products, A=0.400M initially and 0.250M after 15.0 min. What is the value of the rate constant, k?

    asked by Jeremy on January 21, 2013
  30. Chemistry

    If 0.120 moles of water are produced in the reaction H+(aq)+OH-(aq)=H2O deltaH=-56.2kj/mol what is qrxn

    asked by Nick on October 24, 2011
  31. Organic Chemistry

    What is the mechanism of action between sodium benzoate (NaC6H5COO) and hydrochloric acid (HCl)? I need to know where the electrons go in this reaction.

    asked by BOB on October 12, 2011
  32. chemistry

    what is the gas formed when baking soda is added to vinegar? complete the reaction: NaHCO3(s) + CH3COOH(aq)

    asked by shay on October 3, 2012
  33. Chemistry

    Write an equilibrium reaction equation for each of the following buffer mixtures: a)NH3(aq) and NH4Cl(aq) b)HC7H5O2(aq) and NaC7H5O2(aq)

    asked by Anonymous on January 7, 2018
  34. chemistry

    balance the following equation by half reaction method in an acidic medium: C3H8O + MnO4^- gives off C3H6O + Mn^2+

    asked by Jessy on January 13, 2011
  35. Chemistry

    how many moles of silver nitrate are required to react with 24.8 mL of 1.15M calcium chloride in a metathesis reaction Thanks!

    asked by Wendy on April 24, 2012
  36. 11th grade physics

    if action and reaction are always equal and opposite, why don't they always cancel each other and leave no force for acceleration of the body?

    asked by help on November 8, 2010
  37. Chemistry

    Write the net ionic equation for the precipitation reaction between ammonium sulfide and cadmium nitrate.

    asked by Kelly on June 7, 2010
  38. physics

    if the reaction time is 10.0s, how far will the car travel before hitting the brakes? Vf = 27.42 m initial speed = 80 km/hr coefficient of friction = 1.00

    asked by jb on June 25, 2012
  39. Chemistry

    Write the net ionic equation for the precipitation reaction between ammonium sulfide and cadmium nitrate.

    asked by Kelly on June 7, 2010
  40. chemistry

    How many moles of oxygen can be obtained by the decomposition of 7.5 mol of reactant in the following reaction? 2KClO3 -> 2KCl + 3O2

    asked by Maria on January 20, 2011
  41. chemistry

    when you are given two half reactions and you are told to calculate net E^O, would you find the voltage for each reaction and subtract the two to get the answer?

    asked by Anonymous on May 20, 2010
  42. chemisry

    8. Write the structural formula of organic product that would result from the reaction: CH3—CH=CH2 + H2O->.

    asked by cindy on May 4, 2011
  43. Chemistry 12

    If two students compared their instantaneous reaction rates, would you expect their results to be the same? Explain (Hint: Think of tangent.)

    asked by Amy on September 9, 2013
  44. AP Chemistry

    For the reaction 2C6H6+15O2 =12CO2+6H2O, what is the maximum amount of CO2 which could be formed from 5.12 g of C6H6 and 12.28 g of O2?

    asked by Anonymous on September 7, 2013
  45. Chemistry

    How much work (in J) is involved in a chemical reaction if the volume decreases from 5.00 to 1.26 L against a constant pressure of 0.857 atm?

    asked by Dorian on February 23, 2018
  46. CHEMISTRY

    Method for getting correct answer? Thank You! What is Kp for the reaction below, if Kc = 1.13e-3 at 111.2°C? 4A(s) + 5B(g) ↔ 3C(g) a. 1.36e-5 b. 1.15e-12 c. 1.14e-6 d. 8.42e-3

    asked by Chemistry on April 6, 2014
  47. Language of Health Care

    How are the processes of blood clotting, immune response, allergic reaction, and hormone release interrelated?

    asked by Patricia on January 15, 2009
  48. Chem - Stoichiometry

    How many grams of sodium carbonate is required for a complete reaction with 1.00g of calcium chloride dihydrate? Help!

    asked by Erin on October 18, 2009
  49. Chemistry

    Write the net ionic equation for the precipitation reaction between ammonium sulfide and cadmium nitrate.

    asked by Kelly on June 7, 2010
  50. CHEMISTRY

    complete and balance the reaction. HCl + Ba(HO)2 --- the 2 is suppose to be a sub 2 but can get it to do so on this computer and the --- is an arrow. I believe it is BaClO + H2O is this correct?

    asked by Carla on May 3, 2011
  51. Chemistry

    What are the other two independent other than concentration for reaction of hydrochloric acid with calcium carbonates. And what are thier control variable?

    asked by Zee on September 16, 2016
  52. Science

    How does Exothermic and Endothermic reactions affect the rate of a reaction? Please help. I need something that will be easy for me to understand and adopt into my own words. Thank You :)

    asked by Anonymous on November 23, 2014
  53. Chemistry

    Consider the reaction 2 Al2O3(s) → 4 Al(s) + 3 O2(g). ∆H = +3339.6 kJ/mol What is the change in heat when 0.455 L of a 3.60 M Al solution reacts with excess O2 ?

    asked by Mary on January 10, 2014
  54. chm152

    At a particular temperature, Kc = 54 for the reaction H2(g) + I2 (g) 2 HI(g). One mole of HI is placed in a 3.0-L container. What would be the equilibrium concentration of HI? Choose one answer. a. 0.035 b. 0.071 c. 0.29 d. 0.30 e. 0.33

    asked by AMI on March 28, 2010
  55. Chemistry

    A reaction at 3.24 atm consumes 5.10 L of a gas adiabatically (q = 0). Calculate the change in internal energy of the system (in kJ).

    asked by JUNDY on March 31, 2015
  56. chem 223

    What additional volume of 10.0 M HCl would be needed to exhaust the remaining capacity of the buffer after the reaction described in Part B?

    asked by juan on July 22, 2013
  57. PHYSICS

    What is the reaction effect of the following action effects? a) Earth orbits the sun b) Ball accelerates downward Thank YOu.

    asked by JJ on November 21, 2010
  58. Chemistry- Please Help!!

    Predict the proper equilibrium constant expression for the following reaction... Fe(OH)3(s) ----> Fe3+(aq) + 3 OH-(aq) Explain the reasoning behind your answer.

    asked by Kelly on July 27, 2013
  59. physics

    What reaction would you get from francium and water in outer space and what if you added hydrogen to the experiment as far as being used for fuel for travel

    asked by scott on January 17, 2012
  60. Chemistry

    When the equation for the following reaction in basic solution is balance, what is the sum of the coefficients? MnO2 + HO2^1-.....>MnO4^1- A=11 B=31 C=14 D=9

    asked by Wube on April 28, 2012
  61. chemistry

    Write a balanced chemical equation for the reaction that occurs when the hydrocarbon styrene, {\rm C}_{8}{\rm H}_{8}(l), is combusted in air.

    asked by seema on October 5, 2011
  62. chemistry

    explain inside a flashbulb are the 2 reactants necessary for a violent reaction that produce light yet they don't react..

    asked by trina on May 17, 2011
  63. organic chemistry

    Predict the relative rates for the reaction of butadiene and (a) ethene, (b) methyl propenoate, (c) maleic anhydrid.

    asked by believe on May 20, 2009
  64. chemistry

    for a reversible reaction if the concentration of reactant are doubled aad a definate tempreture then equilibrium constant will

    asked by Anonymous on September 4, 2013
  65. Chemistry

    Calculate the cell potential for the following reaction as written at 25.00 °C, given that [Mg2 ] = 0.763 M and [Sn2 ] = 0.0180 M Mg(s)+Sn^2+(aq)-->Mg^(2+)+Sn(s) I keep getting 2.57 but it says I'm wrong. Please help me!

    asked by Lizzie on May 19, 2014
  66. Chemistry(please check my answer)

    Which of the following is an oxidation reaction? A. AuCl4- → AuCl 2- **** B. Mn7+ → Mn2+ C. Cl2 → ClO3- D. Co3+ → Co2+

    asked by Cherry on September 1, 2016
  67. Please help needed urgent

    N2 (g) + 3H2 (g) → 2NH3(g) ΔH = -92.2 kJ What mass of ammonia is theoretically produced if the above reaction released 168 kJ of heat?

    asked by Please Help on October 15, 2017
  68. Chemistry

    Calculate the cell potential for the following reaction as written at 25.00 °C, given that [Mg2 ] = 0.763 M and [Sn2 ] = 0.0180 M Mg(s)+Sn^2+(aq)-->Mg^(2+)+Sn(s) I keep getting 2.57 but it says I'm wrong. Please help me!

    asked by Lizzie on May 19, 2014
  69. Chemistry

    If a reaction quotient is undefined, and the Kc = 1. A+B=>C A=0m, B=0m, C=10m What happens to the concentrations of A,B,C? do they decrease or increase or no change to reach equil?

    asked by Jenny on February 9, 2011
  70. chemistry

    if a reaction vessel contains 11.5g NH3, 12.0g O2, and 10.5g CH4, what is the maximum mass in grams of hydrogen cyanide that could be made?

    asked by robert on October 13, 2012
  71. chemistry

    what is the coefficients on Oxygen in the balanced equation for the following hydrocarbon combusion reaction C7H14 + O2 = CO2 + H2O

    asked by Doss on October 26, 2011
  72. chemistry

    calculate the number of grams of co2 that can be absorbed by complete reaction with a solution that contains 5.00 g of sodium hydroxide

    asked by Anonymous on February 10, 2010
  73. Science PLEASE HELP

    How does Exothermic and Endothermic reactions affect the rate of a reaction? Please help. I need something that will be easy for me to understand and adopt into my own words. Thank You :)

    asked by Anonymous on November 23, 2014
  74. chemistry

    If the initial concentration of AB is .250 M, and the reaction mixture initially contains no products, what are the concentrations of A and B after 75s?of XY after 5.0 X10^1s?

    asked by Ashton on February 22, 2010
  75. ochem

    For a Grignard reaction, if you start with 3.97 mL of pure bromobenzene and 0.733 g of 1-phenylethanone, what is the theoretical yield of 1,1-diphenylethanol? Please help.

    asked by ochem on February 27, 2012
  76. Chemistry

    Hydrofluoric acid etches glass by reacting with the silica in it according to the following equation. H° = 54.5 kJ and S° = 436.5 J/K Calculate G° at 25°C for this reaction.

    asked by Melissa on November 10, 2010
  77. chem

    6FeO3----->4Fe304+02 DELTA H=+ 392kj If 2.83 g of Fe2O3 decomposed according to the above reaction , how many kj of heat would be exchanged with the enviroment?

    asked by lauren on October 16, 2009
  78. Chemistry

    Identify the acid or base behavior of each substance in this reaction: H2PO4 + H2O H3O+ + HPO4-

    asked by Rachael on May 11, 2011
  79. chemistry

    Ca + Br2 --> CaBr2 its synthesis and the reason the reaction happens is stable electron configuration but i don't understand why.

    asked by lyne on January 22, 2009
  80. chemistry

    The dH for the reaction below is -482 kJ. Calculate the heat (kJ) released to the surroundings when 12.0 g of CO (g) reacts completely. 2CO(g) + O2(g) --> 2CO2(g)

    asked by tank on April 16, 2012
  81. AP Chem

    Lead metal is added to a solution of hydrochloric acid. What would be the theoretical cell potential, E°, for the reaction?

    asked by Sam on April 14, 2015
  82. Chemistry

    Calculate the grams of NaNO3 required to produce 5L of oxygen at STP if the percent yield of the reaction is 78.4%?

    asked by Harry on May 2, 2014
  83. chemistry

    write and equation for the reaction of triethylamine and water. does the eqilibrium go to the right or left. so far what I have is C6H15N + H2O but I'm not sure of the products

    asked by casey on April 12, 2012
  84. chm152

    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 ami on March 27, 2010
  85. chemistry

    4NH3(g)+5O2(g) yield 4NO(g)+6H2O(g) Deduce the equilibrium constant expression for the reaction.

    asked by John on April 27, 2012
  86. chemistry

    Write a balanced equation showing the solubility equilibrium reaction of solid calcium hydroxide??

    asked by Anonymous on April 12, 2012
  87. physics

    Write down a half-reaction that explains the change that occurs on the surface of the copper spoon during electrolysis.

    asked by Dludlu on April 11, 2012
  88. Chemistry

    Do chemists speed a reaction by using bunsen burners or steam baths because this lowers the activation barrier?

    asked by Ashley on October 10, 2011
  89. SCIENCE

    CAN WE USE A COPPPER VESSEL FOR STORING 1 MOLAR AgNO3 SOLUTION? IF NO JUSTIFY BY GIVING CHEMICAL REACTION BETWEEN THEM

    asked by DEEPTHY on November 9, 2014
  90. chemistry

    Balanced equation of the reaction that occurs when the butane in cigarette lighters burns in the presence of enough oxygen

    asked by patience on March 18, 2014
  91. chemistry

    Na3PO4(aq) + AlCl3(aq) produces? Complete and balance each of the following equations. If no reaction occurs, write NOREACTION.

    asked by Anonymous on October 10, 2010
  92. Physics

    Determine the stopping distances for a car with an initial speed of 93 km/h & human reaction time of 0.80 s, for an acceleration a=−4.0m/s2.?

    asked by Kelly on October 12, 2015
  93. Chemistry

    Complete the following chemical reaction. Label any precipitate that forms. KCl(aq) + AgNO3 (aq) ¨KNO3 (aq)+AgCl(s)

    asked by Angela on August 7, 2012
  94. organic chemistry

    Assuming that an average 1 oz of black tea contains approximately 6 mg of caffeine, determine the experimental and %yield of the reaction.

    asked by Mary on April 7, 2010
  95. chemistry

    how do I calculate the mass of ammonium sulfate formed from the complete reaction of 700 grams of ammonia?

    asked by Stephanie on March 17, 2013
  96. chemistry

    Give the complete ionic equation for the reaction (if any) that occurs when aqueous solutions of MgSO3 and HI are mixed

    asked by Anonymous on April 13, 2011
  97. chemistry

    Consider the following chemical reaction: 2H2O2(L) ¨ 2H2O(L) + O2(g) ƒ¢Hrxn = -196.1 kJ How much heat is released if 2 moles of O2 are produced?

    asked by peterson on March 9, 2014
  98. Chemistry

    Possible Sources of error in a reaction or sodium bicarbonate and acetic acid. Also known as baking soda and vinegar.

    asked by Grace on February 25, 2014
  99. Science

    Which statement best summarizes the world’s reaction to stratospheric ozone depletion discussed in Chapter 7.4 of your text?

    asked by 100 % on March 4, 2014
  100. chemistry

    what is the pressure of H2 if the hydrogen gas collected occupies 14L at 300K and was produced upon reaction of 4.5 mol of Al?

    asked by brenda on March 14, 2010