1. chemistry

    The half-life of a first order reaction is determined to be 60.5 years. How long will it take for the concentration of the reactant to reach 2% of its initial value?
  2. Chemistry

    What would Qc be if the volume of the container increased by a factor of 1.604 for this reaction SO2+Cl2 SO2CL2 kc = 12.821 at 373K
  3. Chemistry

    Help with lab report Need Help finishing my lab report.KNOWN VALUES ARE V OF HCL=50ML,M=2.188.V OF NAOH=55.3ML,M=2.088.INTIAL TEMP FOR HCL=22.5C,NAOH IS 23C.this is for part A: Mass of final NACL solution assuming that the density of a 1 M Nacl solution is
  4. chem experiment:

    You are required to design an experiment to test Hess's law using the combustion of ethanol. Write a brief design for this experiment. What I wrote as my answer: Hess’ Law: is the algebraic addition of chemical equations yields a net equation whose
  5. Math

    A problem is listed below. Identify its type. John bought a new house. He made a $4,500 down payment and financed the rest, $280,000, through his credit union. The credit union charged him 11% per year compounded monthly for 22 years. How much were his
  6. chemistry

    Name the compound (CH3)2CHCCCH3 1. 2-methyl-3-pentyne 2. 3-methyl-1-pentyne 3. 5-methyl-2-pentyne 4. 4-methyl-2-pentyne 5. 3-methyl-2-hexane 6. 4-methyl-2-pentene Can you also explain how to draw the structure? Thanks:)
  7. chem

    which one of the following statements about sulfuric acid is correct? A. sulfuric acid is a known muriatic acid B. sulfuric acid is a strong oxidizing agent C. sulfuric acid has little effect on metals D. sulfuric acid is dangerous to living organisms B
  8. Physics

    I have to compare and contrast three types of tires, and relate them to physics. I've chosen: Racing tires Winter tires All season tires I've chosen to compare them on: Tire tread pattern Rubber compound ??? As you can see, I need something else to
  9. Math

    Write the compound statement in symbols. Let r = The food is good, p = I eat too much, q = I'll exercise. If the food is good and I eat too much, then I'll exercise.
  10. MATH

    a molecule of sodium carbonate contains 2 atoms of sodium to every 3 atoms of oxygen. could a compound containing 12 atoms of sodiumand 15 atoms of o2 be na carbonate explai
  11. Math-CONFUSING!!

    Write the compound statement in symbols. Let r = The food is good, p = I eat too much, q = I'll exercise. If the food is good and I eat too much, then I'll exercise.
  12. math

    the freshman class ranges in height from 4'8"-6'. Write a compound inequality for the height of a freshman "f". Then write it as an absolut value inequality.
  13. Math

    A bank offers two interest account plans. Plan A gives you 6% interest compound annually. Plan B gives you 13% annual simple interest. You plan to invest $2,000 for the next 4 years. Which account earns you the most interest (in dollars) after 4 years? How
  14. chemistry

    pKa = 2.1; pH = 2.0 (stomach); pH = 6 (intestines) = 99.98741233 % ionized in intestines = 0.012587669 % non-ionized in = 55.7311634 % non -ionized in stomach =44.2688366% ionized in stomach Predict whether this compound will be absorbed by passive
  15. Chemistry

    Which of the following compounds has the greatest molar solubility? A) AgBr, Ksp= 5.4 x 10^13 B) Ba3(PO4)2, Ksp = 3.0 x 10^-23 C) Al(OH)3, Ksp = 1.9 x 10^-33 D) MgF2, Ksp = 7.4 x 10^-11 E) Pb(OH)2, Ksp = 1.2 x 10^-15 I know the answer for this problem is
  16. Art

    Which of these is the best definition of freedom of expression? A. expression that doesn't cost anything to have or share B. uncensored speech, art, or other means of communication. C. wild, uncontrolled expression of ideas D. information and ideas that
  17. Critical Thinking

    Since it is the very nature of terrorism not only to cause immediate damage but also to strike fear in the hearts of the population under attack, one might say that the terrorist were extraordinarily successful, not just as a result of their own efforts
  18. chemistry

    Hi I sent this question a few days ago but did not get it answered I think it may have been mixed up in the jumble. Purpose: The purpose of this lab exercise is to construct a table of relative strengths of oxidizing and reducing agents. By completing this
  19. chemistry

    Hi I sent this question a few days ago but did not get it answered I think it may have been mixed up in the jumble. Purpose: The purpose of this lab exercise is to construct a table of relative strengths of oxidizing and reducing agents. By completing this
  20. Maths

    A biscuit manufacturer packs its biscuits into individual boxes using a machine. The weight is advertised on each box as 200 grammes. The machine has been operating for many years and is regularly inspected during production to ensure that it is operating
  21. Chemistry

    You are instructed to create 200. mL of a 0.27 M phosphate buffer with a pH of 7.8. You have phosphoric acid and the sodium salts NaH2PO4, Na2HPO4, and Na3PO4 available. (Enter all numerical answers to three significant figures.) H3PO4(s) + H2O(l)
  22. algebra

    Sam opened a savings account that accrues compound interest at a rate of 3% annually. Let P be the initial amount Sam deposited and let t be the number of years the account has been open. Write an equation to find A, the amount of money in the account
  23. algebra

    I just need a quick check before I hand in my work if you would...Thanks. 1. I am to use the intercepts to graph the equation x+3y=6 I used the formula y=mx+b using 3 and -6 for x I got these as my ordered pairs to graph (3, 1), (-6, 4)…Is this correct?
  24. chemistry

    explain why the pure solvent shows a level horizontal curve as solidification occurs, but the curve for the solution slopes downward slightly. The solvent is BHT and the added particles are an unknown compound. My reasoning is that it happens because the
  25. Chemistry

    Are operating conditions (250 to 300 degees and 50 to 100 atmosphere) consistent with achieving high equilibrium yield of methanol and high production rate. Any conflicts? What is the copper based catalyst? How does its presence help address conflicts.
  26. chemistry

    9. using bond energies, estimate the change in Hr for the following reaction. 2NO + O2--->2NO2 A 1624 kJ B -247kJ C 661 kJ D 54kJ 10. using bond energies estimate the change Hr for the follwing reaction C + 1/2O2 +1/2 N--->O=C=N a -611kJ b 109kJ c 2770kJ d
  27. Chemistry

    Based on the following balanced equation: 2 NH3 + 2 O2 -->N2O + 3 H2O a. How many moles of O2 are required to react completely with 6.00 moles of NH3? b. How many grams of O2 are required to react completely with 6.00 moles of NH3? c. How many moles of H2O
  28. Eng 2

    Which phrase best describes this type of sentence? Sandy creates her best pieces of art late in the day. A) prepositional phrase modifying an adverb B) adverb modifying other adverbs C) prepositional phrase modifying other prepositional phrases D)
  29. Chemistry

    When naming a molecular compound, such as CO, would I write it as mono carbon monoxide or carbon monoxide? My textbook has the rule written as prefix+1st element prefix+2nd element, but I am not sure if the mono applies to the carbon or not.
  30. Chemistry

    I have discovered a new chemical compound with the formula A2B. If a saturated solution of A2B has a concentration of 4.35x10-4M. a) What is the concentration of B2- ions? b. What is the concentration of A1+ ions? c. What is the solubility product constant
  31. Chemistry-please help

    1) Metals that are above hydrogen in the reactivity series react with dilute hydrochloric acid to produce hydrogen gas. Lead is just above hydrogen in the reactivity series.I read a book that says no reaction occurs between lead & dilute acid. Why? Is it
  32. Math

    Department store A charges 9.75% tax; department store B charges 7.25% tax. if a shopper's pre-tax receipt is between $11.57 and $81.43, write and graph a compound inequality that describes the difference in taxes paid for the two locations (to the nearest
  33. Chemistry

    Are my answers correct? C6H14 + 19/2 O2 -> 6 CO2 + 7H2O enthalpy change = -4163 kJ a) if 0.537 mol of carbon dioxide is produced in the reaction represented by the equation above, how much heat is released by the reaction? Enthalpy change = 0.537 mol CO2 x
  34. Chemistry

    Based on the fact that calcium carbonate is an ionic compound, why is it insoluble in water???? Look up your solubility rules. I'm not really sure why, but I know my book states right off that Most sulfide, carbonate, and phosphate salts are only slightly
  35. Chemistry

    The following table contains data for the equilibrium reaction CH3COOH(g)+ C2H5OH(g)↔ CH3COOC2H5(g)+ H2O(g) T = 100oC. Each row in the table represents a different experiment (diffferent intial concentrations). Initial concentration Equilibrium
  36. physics

    Figure 2-42 shows a simple device for measuring your reaction time. It consists of a cardboard strip marked with a scale and two large dots. A friend holds the strip vertically, with thumb and forefinger at the dot on the right in Figure 2-42. You then
  37. chem

    compund containing only C, H, and N yeilds the following data- 1. complete combustion of 34.3 mg of the compund producedmg of CO2 and 40.3 mg of H2O 2. a 65.2mg sample was analyzed by the dumas mthod, giving 35.6 mL of N2 at 740 torr and 25C 3. effusion
  38. Chemistry: Identifying Substances

    Hi! I would like to know the definitions for... ELEMENT: something on the periodic table? COMPOUND: molecule with at least 2 different elements? SYMBOL: i'm confused about this FORMULA: i'm confused about this ATOM: smallest units of elements? MOLECULE: a
  39. Chemistry

    Show the calculation for the limiting reagent when 0.853g of sodium sulfate (95% pure) react with 1.707g of barium hydroxide octahydrate (87% pure) to produce a precipitate of barium sulfate. I've determined the equation is Na2SO4+Ba(OH)2*8H2O=BaSO4+2NaOH
  40. chemistry

    a packaging engineer is working on a new design for cold packs. A burst chamber in the pack will contain 14.0 mL of water, which will be released and used to dissolve ammonia nitrate. a) If the solubility of NH4NO3 is 190g/100g H2O, what mass of this
  41. chemistry

    Anthroquinone (C14H8O2), an important intermediate in the dye industry, is produced from the reaction of benzene with phthalic anhydride (C8H4O3), followed by dehydration with sulfuric acid. The overall reaction is... C8H4O3 + C6H6 --> C14H8O2 + H20 b)
  42. URGENT LANGUAGE ARTS URGENT~!

    Which answer explains why there isn’t a hyphen between well and behaved in the following sentence? The students were so well behaved that Ms. Irvin dismissed them early. (1 point) The words well and behaved don’t end in -ly. The words well and behaved
  43. physical chemistry

    I tried working out this problem but am unsure of a few steps. Please help me if you can. Consider O3 --->1.5O2 At 210degrees Celsius and an initial gas pressure of 0.23atm, it is found that the rate of reaction is 1.8E-2 mol/(Lxs). a) What is the change
  44. organic chemistry

    i'm having trouble figuring out my unknown compound. The elemental analysis is 87.28%carbon and 12.72% hydrogen for my unknown liquid, and for my solid unknown the elemental analysis is 79.22% carbon and 5.7% hydrogen and 15.98% oxygen. I'm not able to
  45. chemistry

    Purpose: The purpose of this lab exercise is to construct a table of relative strengths of oxidizing and reducing agents. By completing this exercise, you will see how more extensive tables of relative strengths of oxidizing and reducing agents have been
  46. 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
  47. 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
  48. 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
  49. 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
  50. 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
  51. 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
  52. chemistry

    my ques is 2Fe2S3+3O2+6H2O-4Fe(OH)3+6S THIS REACTION WRIGHT ,WRONG PLZ JUST REPLY I AM WAIT FOR YOUR ANSWER.
  53. 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
  54. Chemistry

    NaOH+HNO3---> NaNO3+H2O calculate the number of moles of every ion present in solution after the reaction has occurred.
  55. 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?
  56. Chemistry(Urgent, please check!!!)

    The equation A + 2 B = C + D describes an elementary reaction, which takes place in a single step. Thus, the rate law must be? My answer is k(A)(B)^2 Is this correct?
  57. 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?
  58. 11th grade

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

    2 Ch(aq) + Em(aq) + Is(s) + T(g) ⇄ Ry(aq) + 3 Ro(s) + 4 X(g) ΔHrxn=35.6 kJ/mol Name three things that you could do to make the equilibrium below run to the left. What direction would the reaction shift if you added water? Please help me!!
  60. 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?
  61. 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.
  62. 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
  63. Chemistry

    How many molecules of Cl2 would be formed from the reaction mixture that produces the greatest amount of products? 4HCl + O2 --> 2H2O + 2Cl
  64. 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?
  65. 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?
  66. 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?
  67. 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.
  68. 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)
  69. Chemistry

    Sulfur dioxide gas is bubbled through sodium hydroxide solution Write the balanced formula equation for this reaction
  70. 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
  71. chem

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

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

    Whatis the chemical name of the substance formed in the slow reaction that takes place when iron filings are mixed with water?
  74. 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.
  75. 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?
  76. 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
  77. cHEMISTRY

    What mass of AgCl(143.32g/mol) is formed from the reaction of a 0.109 M MgCl2 solution with excess AgC2H3O2?
  78. 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.
  79. 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)
  80. 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)
  81. 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)
  82. Chemistry

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

    Complete and balance the displayed half reaction in neutral aqueous solution taking into account the electrons. Mg(s) → Mg2+(aq)
  84. 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)
  85. Chemistry

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

    give the full, ionic and net equations for the reaction (if any) that occurs when aqueous soulutions of Na2CO3 and MgCl2 are mixed.
  87. 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.
  88. 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?
  89. 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?
  90. 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
  91. Chemistry II

    At a certain temperature, Kc = 33 for the reaction: H2(g) + I2(g) 2HI(g) Assume that the initial concentrations of both H2 and I2 are 6.00 x 10-3 mol/L. Find the concentration of each reactant and product at equilibrium.
  92. Chemistry

    Write a balanced equation showing how you could prepare each of the following salts from an acid-base reaction: KNO3, NaBr, CaS.
  93. 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)
  94. 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)
  95. 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 = ?
  96. 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
  97. 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!
  98. 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?
  99. 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.
  100. 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