1. Maths

    The temperature dropped by 2 degrees an hour during the night. At midnight the temperature was 31 degrees. What was the temperature at 6a.m.
  2. Math

    Adding Integers At 7.00 am the temperature was 8 degrees Celsius. What was the temperature at midnight if the temperature was 10 degrees lower
  3. CHEM HELP!

    A car burning lead-free fuel has a catalytic converter fitted to its exhaust. On analysis its exhaust gases are shown to contain small quantities of nitrogen oxides. Which modifications would result in lower exhaust concentrations of nitrogen oxides? 1 an increase in the ...
  4. physics

    How long does it take a 1000W electric kettle to bring 1.0L of water to the boiling point if the initial temperature is 15oc and the kettle is made of 400g of iron? Assume that no heat was lost to the surroundings and that the kettle was 100% efficient?
  5. chemistry

    PLEASE NOTE: Titration requires several steps in order to obtain exact results. The procedures described in this lab assume that you have already done the TITRATION TUTORIAL and are familiar with the technique. 1. Prepare the NaOH solution by dissolving approximately 4g of ...
  6. chem

    I'm stuck on this one aswell... 50.0 ml of a 0.0500 M solution of lead (II) nitrate is mixed with 40.0 ml of a 0.200 M solution of sodium iodate at 25°C. Calculate the Pb2+ and IO3- concentrations when the mixture comes to equilibrium. At this temperature the Ksp for lead (II...
  7. Physics

    A fish at a pressure of 1.1 atm has its swim bladder inflated to an initial volume of 8.16 mL. If the fish starts swimming horizontally, its temperature increases from 20.0 degrees Celsius to 22.0 degress Celcius as a result of exertion. A)Since the fish is still at the same ...
  8. Chemistry

    Can someone just check this one for me? The neutralization reaction between Al(OH)3 and HNO3 produces a salt with the formula Al(NO3)3 + H2O Yes and no. It DOES produce a salt and that salt is Al(NO3)3 with the formula you have. However, the H2O, although a part of the ...
  9. Chemistry

    For the following balanced equation: 2 Ag+ (aq) + Cu(s) ---> Cu2+ (aq) + 2 Ag(s) Which letter corresponds to the correct cell notation at standard state conditions? A. Cu2+(aq)/ Cu(s) // Ag(s) / Ag+(aq) B. 2Ag+(aq)/ Cu2+(aq)// 2Ag(s)/ Cu(s) C. Ag+(aq) / Cu2+(aq)// Cu(s) / ...
  10. Chemistry

    Write a balanced equation for the overall reaction: Step 1 O3 + Cl --> O2 + ClO Step 2 ClO + O --> Cl + O2 = O3 + O --> 2O2 Is that correct? or would it be O3 + O --> O2 + O2
  11. Dr.Bob

    I was wondering if I'm synthesizing a product in the end. I shouldn't put the end product of each reaction on the front page as well right?
  12. chemistry

    Balance the follwoing chemical reaction in an acidic solution __H2O(l) + __H^+(aq)+ OH^-(aq)+ __ CR2O7^2-(aq) + __ Cl^-(aq)---> __ Cr^3-+ __Cl2(aq)+ __H2O(l) + __H^+(aq) + __ OH^-(aq)
  13. chemistry

    Can I get weblinks that show the esterification reaction which produces ethyl formate and the estirificaiton process which produces Ethyl Butyrate?
  14. Chemistry

    What is the name of the product formed by the reaction of propylide ion and 2-chloropropane? I'm having problem because I don't know the formula of propylide ion.
  15. chem 2

    I just need help setting up this equation. NH3 is titrated with HCL. Does this mean the reaction is this? NH3 + HCL --> NH4 + CL- ??
  16. CHEMISTRY

    HOW MANY GRAMS OF CO2 WOULD BE FORMED FROM 20 GRAMS OF C6H6 IN THE FOLLOWING REACTION? 2 C6H6 + 15O2=12CO2 +6 H2O
  17. chemistry

    name the type of nuclear reaction and name the nuclear symbol that is missing: 27Al13 + ? yields 30P15 + 1n0
  18. chemistry

    What is DG° at 298 K for the following reaction? Pb(s) + PbO2(s) -> 2PbO(s) Substance DG°f (kJ/mol) at 298 K PbO(s) –187.9 PbO2(s) –217.3
  19. Chemistry

    Calculate E, E^o and (delta)G^o for the following cell reaction: Mg(s) + Sn2+(aq) (yields) Mg2+(aq) + Sn(s) [Mg2+] = 0.045 M, [Sn2+] = 0.035 M
  20. chemistry

    the heat of this reaction,Na + 1/2 Cl 2 NaCl, is 98.3 kcal/mole what is the heat given off two moles of NaCl are formed ?
  21. Chemistry

    At equilibrium, [S(CH2CH2Cl)2] = 350 M, [SCl2]=.325M, and [C2H4] =.273 M for the reaction below. SCl2 + 2C2H4 = S(CH2CH2Cl)2 What is the Kc?
  22. science

    If u use 4 g of calcium carbonate in excess acid,instead of 2 g.They find that the rate of the reaction increases.why the rate increases?
  23. Chemistry

    Calculate the grams of KHP needed to react with 25.2 ml of 0.10M KOH if the reaction is? KOH+KHP -----> K2P + H2O
  24. Chemistry

    Suppose that 50 mL of 0.3 M LiOH and 60 mL of 0.1 M NaHSO3 are mixed. What is the K for the dominant equilibrium in terms of Ka's, Kb's, Kw etc.? Ka of HSO3- 1/Ka of HSO3- Kb of OH- 1/Kb of OH- Kb of SO3-2 1/Kb of SO3-2 Kw 1/Kw There is no reaction.
  25. chemistry

    In the reaction of N2 and H2 to produce NH3, how many moles of H2 will produce 37.9 grams NH3 if sufficient N2 is present? Do not enter units with your answer.
  26. chem

    What happens to a catalyst in a reaction? a. it remains unchanged b. it is incorporated into the products c. it is incorporated into the reactants d. it evaporates
  27. Chemisty

    The compound copper(II) nitrate is a strong electrolyte. Write the reaction when copper(II) nitrate is put into water
  28. Chemisty

    The compound potassium carbonate is a strong electrolyte. Write the reaction when potassium carbonate is put into water
  29. chemistry

    The activation energy for the decomposition reaction, 2 HI---> H2 + Hi Is 186 kj/mol. The rate at 555 k is 3.2 x 10 -7L/mol. Sec. What is the rate at 645 k
  30. chemistry

    Consider the reaction at equilibrium: CaO(s) + CO2(g) ! CaCO3(s) If you add more CaO to the system, how will the system respond?
  31. College Chemistry

    For the following reaction: A + 3B ¨ 4C Which of the following provides the direct link between the amount of reactant A and the amount of product C?
  32. chemistry

    equilibrium pressure at 731 K for the reaction H2+I2-2HI initially the mixture contains 0.08592 each of H2 and I2 and 1.0atm.what is the pressure of HI at equilibrium?
  33. Chemistry

    What type of reaction will occur when an aqueous solution of lithium chloride is mixed with an aqueous solution of ammonium sulfate?
  34. Chemistry

    calculate the rate constant at 225C for a reaction that has a rate constant of 8.1X10^-4 at 95c and an activation enegry of 93.0 kj/mol
  35. CHEMISTRY

    Method for how to get answer? Thank you! For the equilibrium reaction below. To what is Kc equal? N2(g) + 3H2(g) ↔ 2NH3(g) a. [N2] + 3[H2] ------------------ 2[NH3] b. [N2][H2]3 ------------------ [NH3]2 c. 2[NH3] --------------- [N2]+ 3[H2] d. [NH3]2 --------------- [N2...
  36. chemistry

    A carbonate ion, CO32−, can participate in an acid-base reaction. How should the carbonate ion be classified?
  37. Chemistry

    For the reaction CaCO3(s)+ 2HCl(aq)= CaCl2(aq)+ CO2(g)+ H2O(l) how many grams of CaCl2 can be obtained if 14.6 g HCl is allowed in CaCO3?
  38. Chemistry

    In an acid-base neutralization reaction 25 mL of 0.4 M NaOH reacts with 50.00 mL of H2SO4 solution. Calculate the concentration of the H2SO4 solution?
  39. Chemistry

    When 2.05 moles of CH4 are mixed with 5.03 moles of O2 in the reaction below, the limiting reactant is CH4 + 2O2 -> CO2 + 2H2O
  40. chemistry

    Calculate Hrxn for the reaction below. 2 NOCl(g) N2(g) + O2(g) + Cl2(g) You are given the following set of reactions. 1/2 N2(g) + 1/2 O2(g) NO(g) H = 90.30 kJ NO(g) + 1/2 Cl2(g) NOCl(g) H = -38.6 kJ
  41. science

    Which rate constant would result in the fastest reaction? A. 1.3 × 103 L/mol · s B. 2.8 L/mol · s C. 9.5 × 10-2 L/mol · s D. 4.2 × 10-3 L/mol · s is the answer for this one c?
  42. Chemistry

    Is carbon dioxide a chemical reaction? Just carbon dioxide itself... (like from fossil fuels, cars, etc.)
  43. Chemistry

    Given Ka values of 5.76×10^-10 & 4.8×10^-10, for NH4+ anf HCN.what is the equilibrium constant for following reaction? NH4+ + CN- >< NH3 + HCN
  44. Chemistry - half life

    What is the half-life (in h) for the decomposition of O3 when the concentration of O3 is 2.37 ✕ 10−6 M? The rate constant for this second-order reaction is 50.4 L/mol/h.
  45. chemistry

    6.70 A sample of benzene, C6H6, weighing 3.51g was burned in an excess of oxygen in bomb calorimeter. The temperature of the calorimeter rose from 25.00C to 37.18C. If the heat capacity of the calorimeter and contents was 12.05kJ/C, what is the value of q for burning 1.25 mol ...
  46. math

    the formula C=5/9(F-32) is used to convert Fahrenheit temperature,F, to Celsius temperature,C. What temperature in Fahrenheit is equivalent to a temperature of 100 Celsius. I know that in Fahrenheit its 212 degrees, but i used it by using guess and check. i need help with how ...
  47. math-story prob

    Please help: Jaylee wants to have a mural for her room. She has two bids: #1 Artist charges an initial fee of $79.50, plus $1 sq ft. Artist #2 does not charge a initial fee and charges $2.50 sq ft. Which size of mural(in sq ft) will be the same cost when painted by either artist?
  48. Chem

    Calculate the Keq of the reversible reactions Cr2O7 + 2OH -> CrO4 + H2O and 2CrO42->Cr2O72 , given the following data: HCrO4 -> H + CrO42 K = 3.2 x 10^-7 2HCrO4 -> Cr2O72 + H2O K = 34 H2O -> H+ + OH- K = 1 x 10^-14 HCL and NaOH = 1M KCrO4 and KCr2O7 = 0.1M
  49. Chemistry

    On a day when the air temperature is 75°F, the relative humidity is measured to be 86%. How many degrees would the air temperature have to be lowered for the relative humidity to be 100%?
  50. physics

    A pair of eyeglass frames are made of an epoxy plastic (coefficient of linear expansion = 1.30 10-4°C−1). At room temperature (20.0°C), the frames have circular lens holes 2.27 cm in radius. To what temperature must the frames be heated if lenses 2.28 cm in radius are ...
  51. physics

    A pair of eyeglass frames are made of an epoxy plastic (coefficient of linear expansion = 1.30 10-4°C−1). At room temperature (20.0°C), the frames have circular lens holes 2.27 cm in radius. To what temperature must the frames be heated if lenses 2.28 cm in radius are ...
  52. physics

    A pair of eyeglass frames are made of an epoxy plastic (coefficient of linear expansion = 1.30 10-4°C−1). At room temperature (20.0°C), the frames have circular lens holes 2.27 cm in radius. To what temperature must the frames be heated if lenses 2.28 cm in radius are ...
  53. chem

    2H202--> 2H20 +O2 Given that you started with ½ cup of H2O2, what was the mass of each product in the reaction? (1/2 cup = 118.3 mL, density of H2O2 is 1.4 g/mL)
  54. Chemistry

    Hi I need help with another balancing oxidation-reduction reaction: Cu(s) + Ag^1+(aq) → Cu^2+(aq) + Ag(s) My work: Cu (s) --> Cu^2+ (aq) + 2e- 2 [1e +Ag^1+ (aq) --> Ag(s)] Cu(s) + 2 Ag(aq) --> Cu (aq) + 2 Ag (s) Is this right? And I need help with this one... Zn...
  55. chemistry

    3CS2 + 6 NaOH==> 2 Na2CS3 + Na2CO3 + 3 H2O how many grams of Na2CS3 are produced in the reaction of 65 ml of liquid CS2(d=1.26 g/ml) and 1.56 mol NaOH?
  56. chemistry

    how many grams of lithium sulfate will be formed when 25 grams of sulfuric acid react with an excess of lithium hydroxide in the following reaction
  57. Chemistry

    Will a double replacement reaction take place if a solution of sodium hyrdrogen carbonate is added to a solution of sodium chloride?
  58. Chem

    How much heat will be produced when 16grams of C2H6 burns? The reaction is 2 C2H6 + 7 O2 --> 4CO2 + 6 H20 triangle heat = -350kJ
  59. chemistry

    theoretical yield of NaCl using 0.016 mols HCl with HCl + NaOH - NaCl + H2O as the equation for the reaction
  60. Chemistry

    Use the standard reduction potentials in volts: Cu^2+ --> Cu+ +0.16; I2--> I- +0.54. calculate the value of E (in volts) for a cell in which the overall reaction is= 2Cu+ + I2--> 2Cu^2+ + 2I-
  61. Chemistry

    Use the standard reduction potentials in volts: Cu^2+ --> Cu+ +0.16; I2--> I- +0.54. calculate the value of E (in volts) for a cell in which the overall reaction is= 2Cu+ + I2--> 2Cu^2+ + 2I-
  62. Chemistry

    reaction between sulfur and oxygen is S+O2 = SO2. how much sulfur is in the original materials, would result in 1000g of so2
  63. chemistry

    How many grams of carbon disulfide,CS2 will form if 0.450 mol of carbon is consumed in a 3C+2SO2=CS2 +2CO2 reaction
  64. chemistry

    How many grams of carbon disulfide,CS2 will form if 0.450 mol of carbon is consumed in a 3C+2SO2=CS2 +2CO2 reaction
  65. Chemistry

    will acidic foods cooked in a cast iron skillet become Fe+2 enriched because of a reaction beteen the acidic food and the skillet?
  66. chemistry

    Suppose that 1.78 x 10^3 kg of Fe are obtained from a 5.80 x 10^3 kg sample of Fe2O3. Assuming that the reaction goes to completion, what is the percent purity of Fe2O3 in the original sample?
  67. chemistry

    How many grams of CaO (56.08) are required for complete reaction with HCl (36.46) in 275 mL of a 5.90 M HCl solution? CaO + 2HCl --> CaCl2 + H2O.
  68. Chemistry

    Consider the reaction CH4+ 2Cl2=CCl4. If .33 moles of CH4 is reacted with 1 mole of Cl2, how much CCl4 is produced?
  69. chemistry

    What does a catalyst do to the rate of reaction? What would you expect to happen to the rate of decomposition of dinitrogen pentoxide if a catalyst were added to the system?
  70. chemistry

    The reaction of 9.3 grams of fluorine with excess chlorine produced 4.1 grams of ClF3. What percent yield of ClF3 was obtained?
  71. ap chemistry

    In the reaction below, 22 g of H2S with excess O2 produced 10 g of sulfur. ?H2S + ?O2 ! ? S + ?H2O. What is the percent yield of sulfur? Answer in units of %
  72. AP Chemistry

    For the reaction ? ZnS + ? O2 →? ZnO+? SO2 , what is the maximum amount of ZnO which could be formed from 14.06 g of ZnS and 5.56 mol of O2? Answer in units of g
  73. Chemis

    Write a blanaced molecular equation for the reaction 2Na(NO3) + Cu(OH)2. Write complete ionic and net ionic equations?
  74. Chemistry

    Write a blanaced molecular equation for the reaction 2Na(NO3) + Cu(OH)2. Write complete ionic and net ionic equations?
  75. chemistry

    Assume that a particular reaction evolves 241 of heat and that 25 of work is gained by the system. What are the values of delta E and delta H for the system?
  76. chemistry

    Propane reacts with oxygen in a combustion reaction. What volume of carbon dioxide gas is formed when 20 L of propane are reacted with 55.7 L of oxygen?
  77. ap

    The reaction of 5.3 grams of fluorine with excess chlorine produced 4.6 grams of ClF3. What percent yield of ClF3 was obtained? Answer in units of %
  78. chem

    How many grams of the adipic acid (C6H10O4) could form from the reaction of 15.00 g of cyclohexane (C6H12) with the 25.00 g of oxygen? Will the formula be... 2O2 + C6H12 ---> C6H10O4
  79. chemistry

    consider mixing 3.5L of co2 and 1.8L of h2o at 35C and 740mm Hg. determine the mass of the unbalanced reaction. CO2 + H2O = C4H10 + O2
  80. Chemistry

    A voltaic cell operates with 0.40 M Zn 2+ at the solid zinc anode and 1.45 M Zn2+ at the solid zinc cathode at 25 C. Is the reaction thermodynamically favored?
  81. Chem

    Given the following reaction: 4 KO2 + 2 H2O + 4 CO2 ==> 4 KHCO3 + 3 O2 How many moles of O2 will be produced if 3.27 moles of CO2 react completely?
  82. chem 100 electrochemisty

    Calculate the standard reduction potential for the reaction that coverts Cu3+ to Cu2+. Cu3+ + 2e-> Cu+ E0 =1.28 V Cu2+ + e-> Cu+ E0 = 0.15V
  83. Chemistry

    A vessel initially contains pure A at a pressure of 1.0 bar. The total pressure of all gases at equilibrium is 1.5 bar. What is K for this reaction? A (g) <--> B (g) + C (g)
  84. Chemistry

    A vessel initially contains pure A at a pressure of 1.0 bar. The total pressure of all gases at equilibrium is 1.5 bar. What is K for this reaction? A (g) <--> B (g) + C (g)
  85. Chemistry

    A vessel initially contains pure A at a pressure of 1.0 bar. The total pressure of all gases at equilibrium is 1.5 bar. What is K for this reaction? A (g) <--> B (g) + C (g)
  86. chemistry

    What is the unbalanced equation for the combustion reaction of gaseous C4H10 and gaseous oxygen to form gaseous carbon dioxide and gaseous water?
  87. chemistry

    A reaction has a first order rate constant of 6.11x10-5 s-1 at 25C and 0.00221 s-1 at 85oC. What is the value of the rate constant at 63oC?
  88. Chemistry

    Which of the following is true concerning the reaction below? H2S + HNO3 → S + NO + H2O A. S is reduced. B. H is oxidized. C. N is reduced. D. O is oxidized. ***
  89. Chemistry

    The compound copper(II) nitrate is a strong electrolyte. Write the reaction when solid copper(II) nitrate is put into water:
  90. Chemistry

    In the reaction of formation of sodium chloride (NaCl), 15 g of sodium is placed in contact with 20 g of chlorine. What is the reactant in excess and its mass in excess?
  91. Chem

    Given the reaction: Fe2SiO4 (s) + 2 H2CO3 (aq) ----> 2FeCO3 (s) + H4SiO4 (aq). How many grams of Fe2SiO4 are required to completely react with 55.0 mL of .500 M H2CO3 (aq)?
  92. Chemistry

    Given the reaction: Fe2SiO4 (s) + 2 H2CO3 (aq) ----> 2FeCO3 (s) + H4SiO4 (aq). How many grams of Fe2SiO4 are required to completely react with 55.0 mL of .500 M H2CO3 (aq)?
  93. Chemistry

    Given the reaction: Fe2SiO4 (s) + 2 H2CO3 (aq) ---> 2 FeCO3 (s) + H4SiO4 (aq) how many grams of Fe2SiO4 (s) are required to completely react with 55.0 mL of .500 M H2CO3 (aq) ?
  94. AP Chemistry

    In the reaction below, 17 g of H2S with excess O2 produced 10 g of sulfur. 2 H2S + O2 → 2 S + 2 H2O . What is the percent yield of sulfur? Answer in units of %.
  95. Science: Chemistry

    Can the Law of Conservation of Mass be applied to a chemical reaction in which a gas is produced? Yes. THe gas has mass.
  96. Chem

    Is this the balanced chemical equation for reaction between NaBr and H2SO4? H2SO4 + NaBr ---> HBr + NaHSO4
  97. Chemistry-help

    What is the chemical equation for the reaction between iron and sulphur to produce iron sulphide? Do we write sulphur as S or S8?
  98. chemistry

    in the lab of reaction with copper copper is suppose to loose mass because it oxidates. its that right or does it gain mass thanks
  99. chemistry

    how many moles of Cl2 will be produced from the reaction of 9.61 moles of HCl? MnO2 + 4HCl = MnCl2 +Cl2+2H2O
  100. REACTION STEPS AND MECHANISM FOR [CO(NH4)3CO3]NO3

    (NH4)2CO3 + NH3+[CO(OH2)6](NO3)2+H2O2
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