1. math

    1. the speed of light is 8.0x^8m/s in standard form that is? 2. the average size of a virus is 2x 10^-10 nanometers in diameter. how to write the number(s) given scientific notation in standard form. thank you
  2. math

    A cat can walk 2,190 miles in 2 hours. How can 2,190/2 be written in expanded form? 1) 2,000+100+90/2 2)200+90+1/2 Write it in quotation form.
  3. math

    The disney Golf classic starts with 64 golfers. the golfes form pairs and each pair plays amtch. the losers drop out nad the winners of each pair then form new pairs and play again. Then those winners form pairs and play. this continues until there is one
  4. college algebra

    I think this is an exponential equation. I can not figure out how to put the equation into the TI-84 to get the approximate form 3/5 ln(5x-1)+1 =1.4 subtract 1 from sides and divide by 3/5 lh(5x-1)=0.6667 Put in logarithm form e^0.6667=5x-1 add 1 to both
  5. Chemistry

    (a) Propylene, H2C=CH-CH3, can be reacted to form a polymer known as polypropylene (PP). What type of polymerization reaction is most appropriate for the formation of polypropylene? i)Addition Polymerization ii)Anionic Polymerization iii)Condensation
  6. chemistry

    The electrochemical cell described by the balanced chemical reaction has a standard emf (electromotive force) of 0.27 V. Calculate the equilibrium constant (Kc) for the reaction at 298 K. Round your answer to 3 significant figures. H2O2(aq) + 2ClO2(g)
  7. chemistry

    Liquid Nitrogen tetroxide, N2O4(l), was used as a fuel in Apollo missions to the moon. In a closed container the gas N2O4(g) decomposes to nitrogen dioxide, NO2(g). The equilibrium constant,k, for this reaction is 0.87 at 55 degrees Celsius. A vessel
  8. Chemistry

    Consider the following reaction: 4NH3(g) +5O2(g) -->4NO(g) +6H2O(g) Suppose we have two flasks connected by a stopcock. In one flask, we have 2.0L of NH3(g) at a pressure of .500 atm. In the other flask, we have 1.00L of O2(g) at a pressure of 1.5atm.
  9. chemistry

    Indicate the number of covalent bonds that each nonmetal atom is expected to form. a. Se is expected to form 2 covalent bonds. b. H is expected to form 1 covalent bonds. c. Br is expected to form 1 covalent bonds. d. N is expected to form 3 covalent bonds.
  10. physics-please check

    is this right?: when a form of energy changes from one form to another some energy may transfrm into a useful form, those useful form of energy is high grade energy.while the rest of the energy will always change to form we cannot use.which is called the
  11. Chemistry

    Reaction of gaseous fluorine with compound x yields a single product y, whose mass percent composition is 61.7% F and 38.3%Cl. (a) What is a probable molecular formula for product Y, and what is a probable molecular formula for X? (b) Draw an electron-dot
  12. Chemistry

    2. Aluminum metal reacts with zinc(II) ion in an aqueous solution by the following half-cell reactions: Al(s) → Al3+(aq) + 3e− Zn2+(aq) + 2e− → Zn(s) a. Predict the potential of the cell under standard conditions. (4 points) b.
  13. Chemistry-Please help

    2C8H18(g)+25O2(g)+16CO2(g)+18H2O(g) 0.290mol of octane is allowed to react with 0.600mol of oxygen.The limiting reactant is Oxygen. How many moles of water are produced in this reaction? After the reaction, how much octane is left?
  14. Chemistry

    Explain why each of the following is incorrect: (a) Entropy increases in all spontaneous reactions. Wouldn't (a) be actually correct? Because when there's a spontaneous reaction, you have less stable molecules and more disorder. It will be lower in some
  15. Chemistry

    Explain using electron-pushing arguments why glycolysis must go through G6P to F6P step (C1 aldehyde to C1 ketone). Focus on the subsequent aldolase-catalysed reaction and explain why glucose 1,6 bisphosphate would not be able to go through the aldolase
  16. chemistry

    The rate constant of the reaction between CO2 and OH - in aqueous solution to give the HCO3- ion is 1.5 1010 1/(M·s) at 25°C. Determine the rate constant at blood temperature (37°C), given that the activation energy for the reaction is 38 kJ/mol. units
  17. mechanics

    a non uniform rod ab of length 4 m and mass 5 kg is in equilibrium in horizontal position resting on two supports at point C and D wgere AC= 1 m and AD= 2 m. the magnitude of reaction at C is half of the reaction at D. Find the distance of the centre of
  18. Microbiology- Biology 205

    Can someone please help me with this question.... When you blow bubbles into a glass of water, the following reactions take place: H2O + CO2 --a--> H2CO3 --b--> H+ + HCO3- 1. What type of reaction is a? 2. What does reaction b tell you about the type
  19. Chem

    Calculate the reaction quotient Q,for the cell reaction.The measured cell voltage is given.balane the chemical equation by using the smallest whole number coefficients. (a) Pt(s)Sn4+(aq),Sn2+(aq)||pb2+(aq),pb2+|C(graphite)(s) -E=+1.33V
  20. Chemistry

    If there was a reaction between organic compounds: OH + Cl --> O + HCl, how would I determine which atoms is the nucleophile (O, Cl, or H)? Here is a picture of the reaction: img33.imageshack.us/img33/3923/29529709.jpg From my understanding, a
  21. chemistry

    The activation energy for the reaction in which CO2 decomposes to CO and a free radical oxygen atom, O, has activation energy of 460 kJ mol^-2. The frequency factor is 2 x 1011 s^-1. What is the rate constant for this reaction at 298 K?
  22. chemistry

    A 2.30 mole quantity of NOCl was initially in a 1.50 L reaction chamber at 400°C. After equilibrium was established, it was found that 20.0 percent of the NOCl had dissociated: 2NOCl(g) 2NO(g) + Cl2(g) Calculate the equilibrium constant Kc for the
  23. Chemistry

    Is the decomposition of lead(ii)nitrate a redox reaction? Equation with O.S. underneath 2Pb(NO3)2 => 2PbO + 4NO2 + O2 +2 -1 +2-2 +4-2 0 I got all the o.s. but I am still confused as to whether or not this makes it a redox reaction. Do the individual
  24. Chemistry

    What are the Oxidation and Reducation reactions for these equations : BaCl2 + NaHCO3 -> BaCO3 + NaCl + HCl (carbon is the reduction reaction, but I don't know what the oxidation reaction is) CaCO3 + HCl -> CaCl2 + CO2 + H2O
  25. combusion -science

    the reaction order with respect to C4H10 =.15 and the reaction order with respect to O=1.6 , the pre exponential factor =4.16.10^9 . the activation energy =125000 kl/kaul. write out an expression for the rate of butane destruction
  26. chemistry kinetics

    The reaction SO2Cl2(g) → SO2(g) + Cl2(g) is a first order reaction carried out at constant volume at 600 K whose t1/2 is 4.1 hr. The initial pressure of SO2Cl2 is 1.25 atm. What will be the total pressure of the system after 1 hour?
  27. Chemistry

    Explain using electron-pushing arguments why glycolysis must go through G6P to F6P step (C1 aldehyde to C1 ketone). Focus on the subsequent aldolase-catalysed reaction and explain why glucose 1,6 bisphosphate would not be able to go through the aldolase
  28. chemistry

    How do you figure out the answer for the reverse reaction? At 350 K the value of Kp for the equilibrium represented by the balanced equation is 2.87 x 10-2. Calculate the value of Kc for the reverse reaction at the same temperature. Express answer in
  29. Chemistry-Please help

    2C8H18(g)+25O2(g)-->16CO2(g)+18H2O(g) 0.290mol of octane is allowed to react with 0.600mol of oxygen.The limiting reactant is Oxygen. How many moles of water are produced in this reaction? After the reaction, how much octane is left?
  30. Math

    5 distinct positive reals form an arithmetic progression. The 1st, 2nd and 5th term form a geometric progression. If the product of these 5 numbers is 124 4/9, what is the product of the 3 terms of the geometric progression? Note: The phase "form an
  31. Chemistry

    From the Standard Potential Table in your general chemistry textbook: Which reaction has been chosen as the 'standard' against which every other reaction is measured? A. 2H+ + 2e– ==> H2 B. O2 + 4H+ + 4e– ==> 2H2O C. F2 + 2e– ==> 2F– D.
  32. chemistry

    When I am writing a half-reaction with a corroding metal that is in Deaerated water, what can i assume there to be in the water that can show up in a half-reaction?
  33. chemistry

    A reaction occurs where the concentration of reactant A changes from 0.74 moles/liter to 0.63 moles/liter in 20 seconds. what is the average rate of reaction?
  34. CHM 152

    The activation energy for a reaction is 37.6 kJ/mole. The rate constant for the reaction is 5.4 x 10-3 s-1 at 45 oC, Calculate the rate constant at 145 oC.
  35. Chemistry

    The rate of a reaction A ---> B is expressed by the rate expression rate=k(A)2. If the molar concentration of A is tripled, the rate of the reaction should increase by a factor of some many?
  36. chemistry

    Given the thermochemical equation: 2 Al(s) + 3/2 O2(g) > Al2O3(s) ΔH = -95.7 kJ find the heat of reaction, ΔH, for the following reaction: 2 Al2O3(s)> 4 Al(s) + 3 O2(g) Select one: a. -95.7 kJ b. +95.7 kJ c. -47.8 kJ d. +47.8 kJ e. +191.4
  37. Chemistry

    In a given 1st order reaction A ---> products, the initial concentration of A is 0.40 M. What will be the concentration of A after 15 seconds if the half-life of the reaction is 3 seconds?
  38. chem for Dr. Bob

    In the reaction 2 H2(g) + S2(g) reverse reaction arrow 2 H2S(g), Kc = 6.28 multiplied by 103 at 900 K. What is the equilibrium value of [H2] if at equilibrium [H2S] = [S2]1/2?
  39. Chemistry

    An exothermic reaction is spontaneous above 400K but non spontaneous below it. Of the deltaH for the reaction is -40.0 kcal, what are the values of deltaS and deltaG at 400K?
  40. Chemistry ( HELP PLEASE!!! )

    Consider the reaction H3PO4+ 3NaOH→Na3PO4+ 3H2O. How much Na3PO4 can be prepared by the reaction of 3.43 of H3PO4 with an excess of NaOH?
  41. chemistry

    When I am writing a half-reaction with a corroding metal that is in deionized water, what can i assume there to be in the water that can show up in a half-reaction?
  42. chem- to clarify....

    "How does a gas differ from a liquid with respect to the following property: Ability to mix with other substances of the same phase to form homogeneous mixtures Gases form homogeneous mixtures with each other regardless of the identities or relative
  43. math

    Solve for x 2^x+1 - 2^x = 112 Put this in exponent form: (3¡îx)(¡îx©ø) Put into equation form: Horizontal stretch of 2, up 3, left 6, reflection on x-axis. Please help me with these three so I can work on the rest using these as examples. Thanks so
  44. Mat 117

    •I am having trouble figuring out this question. Why is (3x + 5) (x - 2) + (2x - 3) (x - 2) not in factored form? Show specifically how to find the correct final factored form. What is this factoring method called? Please help. Thank you.
  45. Math

    1. The expression 6x(4-3x)–5x(x–4)–9x+2) can be written in the form ax^2+bx+c. The value of abc is? 2. A rectanglular garden is being designed for the City of Calgary Park. The length is 3x+5 and the width is 2x–1. The area of the garden can be
  46. Math

    The flat fee of a cab is $3.50 plus an additional $2.25 every mile. b. Write an equation in slope-intercept, point-slope, or standard form. Explain why you chose the form you did What does that mean?
  47. science

    humidity is the amount of water vapor in the air at a given time.if the air at 75 degrees holding the maximum amount of moisture that it can,and the temperture suddenly drops to 60degrees,what is likely to be the result? a)precipitation will be released in
  48. chemistry

    A gaseous mixture containing 5 moles of H2 and 7 moles of Br2 reacts to form HBr. Write a balanced chemical equation. Which reactant is limiting? What is the theoretical yield in moles? What is the theoretical yield for this reaction in grams? How many
  49. Chemistry

    Which of the following elements is most likely to form an ion that will then form an ionic bond with an ion of a Group 1A element? Pt I Fr Be
  50. french

    is this right: black in french is 'noir' for masculin form and for feminin form it is 'noires' please correct me
  51. Science

    What is the name of the energy form that can damage buildings if too much of it is present? and What is the name of a form of renewable energy that comes in and out regularly.
  52. Math HELP!

    1. Write 12/32 in simplest form. Could someone please help me on how I can turn this fraction into simplest form like explain the steps! Thanks.
  53. Math

    Can someone please tell me Why is (4x + 5) (2x - 1) + (x - 9) (2x - 1) not in factored form? What is the correct final factored form? What is this factoring method called?
  54. math

    standard form numbers are used around the world for....... 1:speed of light i need 3 more situations when you use standard form
  55. Standard Form

    Find the equation in standard form for the line that satisfies the given requirements. passing through (1, 5) and (2, 6)
  56. Math

    Simplify each exponent. 'Write the answer in standard form and exponent form. 12^2 (2^8)*(2^-3) 2^15/2^8 4^5+4^2 (3^-3)^2 ((2)^4*(2)^5)/(2)^6 4^2-2^3 help....i forgot how to do these. thanks,
  57. converting parabolic equations

    The vertex form of the equation of a parabola is x=8(y-1)^2-15. What is the standard form of the equation?
  58. Honors Chemistry

    Fe2O3 + 2Al --> 2Fe + Al2O3 How many grams of Fe will form when 97.6g Al2O3 form? Please & Thank you
  59. Algebra II

    (3-4yi)(6+7i)-[(2-3yi)-3(1+7i)] Express it in a+bi form I got 19+42i-21yi+28y but I do not know how to express it in a+bi form, can you please help me with it?
  60. math

    Simplify each exponent. 'Write the answer in standard form and exponent form. 12^2 (2^8)*(2^-3) 2^15/2^8 4^5+4^2 (3^-3)^2 ((2)^4*(2)^5)/(2)^6 4^2-2^3 help....i forget how to do these. thanks,
  61. 7th grade

    WHATS 111,111 IN PRIME FACTORED FORM AND IN TREE FORM?
  62. converting parabolic equations

    The vertex form of the equation of a parabola is x=8(y-1)^2-15. What is the standard form of the equation?
  63. Algebra

    F) Why is (3x + 5) (x - 2) + (2x - 3) (x - 2) not in factored form? What is the correct final factored form? What is this factoring method called?
  64. Algebra

    Does an inequality of the form ax > b always, sometimes, or never give a solution of the form x > c? Give examples to support your answer.
  65. Math

    Can someone please tell me Why is (4x + 5) (2x - 1) + (x - 9) (2x - 1) not in factored form? What is the correct final factored form? What is this factoring method called?
  66. circles

    Convert form standard to general form for circle. Circle with center (a,b) and radius c.
  67. Chem. Again

    28: You have a glass of pure water. Are chemical reactions occurring in the water? If so, what are they? If not, explain why not. 29: While investigating the effects of acid rain in your area, you discover a lake that is surprisingly resistant to changes
  68. chemistry

    Air bags in cars are inflated by the sudden decomposition of sodium azide (NaN3) by the following reaction. 2 NaN3(s) −→ 3 N2(g) + 2 Na(s) What volume of N2 gas, measured at 1.31 atm and 85.0◦C, would be produced by the reaction of 65.0 g
  69. Chemistry

    The homework question is : Calculate the Delta H for the following reaction: C6H6 + O2 -> C + H2O(l) State whether the reaction is exothermic or endothermic. I'm not sure where to go with this but so far I balanced out the formula to this C6H6 + (3/2)O2
  70. Chemistry please help

    A general reaction written as 1A + 2B --> C + 2D is studied and yields the following data: Expt (A). (B) initial (C)/t 1. 0.150. 0.150. 8.00 x10^-3 2. 0.150. 0.300. 1.60 x10^-2 3. 0.300. 0.150. 8.00 x10^-3 What is the order of the reaction with respect
  71. chemistry

    What is the acid and base whose reaction will produce the salt Na3PO4? What is the acid and base whose reaction will produce the salt PbS? What is the acid and base whose reaction will produce the salt KIO3? phosphoric acid, sodum hydroxide lead hydroxide,
  72. chemistry

    Which of the answer choices correctly defines reaction rate? the amount of reactants used in a specific type of reaction the amount of products produced in a specific type of reaction the speed at which reactants change to products over a given time the
  73. Mathematics

    Express the Complex Number -1-i in polar form. how is complex no expressed in polar form? what is polar form of complex no? Please help
  74. English

    1.All of the balloons on the string (popped) except two. 2.Do you (want) to buy those books? 3.Daniel's dog is (following) the trail to the river's edge. 4.For thirty years the noon whistle has (blown)exactly on time. 5.The players have (challenged) their
  75. ELA

    What is the BEST description and explanation for the underlined word in this sentence? The barking dog woke the entire neighborhood with his incessant noise. A) Barking is an adjective form being used to modify the dog. B) Barking is a verb form being used
  76. chemistry

    Am doing a lab report on the determination of the product of a redox reaction: the reaction of bromate and hydroxylammonium ions. here is the lab Experiment: In this experiment you will determine the equation of a redox reaction by the use of experimental
  77. CHEMISTRY

    1.Calculate the enthalpy change (ΔHºrxn) for the following reaction: (The enthalpy of formation of aqueous sodium hydroxide is -469.60 kJ/mol. The enthalpy of formation of liquid water is -285.8 kJ/mol.) 2Na (s) + 2H2O (l) → 2NaOH (aq) + H2 (g)
  78. math

    The large red equilateral triangle has sides of 8x units. The midpoints of the red triangle are joined to form the blue triangle. The midpoints of the blue triangle ate joined to form the green triangle. The process of joining midpoints to form new
  79. Chemistry

    In a constant-pressure calorimeter, 65.0 mL of 0.330 M Ba(OH)2 was added to 65.0 mL of 0.660 M HCl. The reaction caused the temperature of the solution to rise from 23.85 °C to 28.35 °C. If the solution has the same density and specific heat as water,
  80. chemistry

    The given reaction, cyclopropane propene (isomerization), follows first-order kinetics. The half-live was found to be 4.57 min at 796 K and rate constant was found to be 0.0328 s-1 at 850 K. Calculate the activation energy (in kJ/mol) for this reaction.
  81. chemistry

    5. Meals-ready-to-eat (MREs) are military meals that can be heated on a flameless heater. The heat is produced by the following reaction: Mg(s) + 2H2O(l) --> Mg(OH)2(s) + H2(g) Calculate the number of grams of Mg needed for this reaction to release
  82. chemistry

    write a balanced chemical equation for calcium nitate plus sulfuric acid produces calcium sulphate and ? This is a metathetical reaction, I think more properly called a double displacement reaction now. Just change + and - partners. Ca(NO3)2 + H2SO4 ==>
  83. Chemistry

    I am not sure about this question I tried a) but am very confused with b. Experiments were preformed with four metals and solutions of their ions: A- A+, B-B2+, C-C2+, D-D2+. The results of the experiment were: D2+ + C --> No reaction B2+ + C --> B +
  84. Chemistry

    What volume of gas can be produced in a lab where pressure is 16.0 psi and temperature is 25 C if you collect it over water from the reaction of 50g of ammonium sulfate with 50g of aluminum hydroxide. The equation for the reaction is: 3(NH4)2SO4 + 2Al(OH)3
  85. chemistry

    An enzyme-catalyzed reaction is carried out in a 50-mL solution containing 0.1 M TRIS buffer. The pH of the reaction mixture at the start was 8.0. As a result of the reaction, 0.002 mol of H+ were produced. What is the ratio of TRIS base to TRIS acid at
  86. Chem

    Suppose that a stable element with atomic number 119, symbol Wr, has been discovered. (d) What would be the most likely charge of the Wr ion in stable ionic compounds? (e) Write a balanced equation that would represent the reaction of Wr with water. (f)
  87. Chemistry

    For a certain reaction, ΔH° = –76.8 kJ and ΔS° = –225 J/K. If n = 3, calculate E° for the reaction at 25°C.
  88. chemistry

    A reaction has a rate law, rate = kA]B]^2 What is the overall order of the reaction? a. 2 b. 3 c. 0 d. 1 e. 4
  89. chemistry

    redox reaction..types of redox reaction and explain
  90. Chemistry

    MF17083:For the following reaction find Kp at 25°C and indicate whether Kp should increase or decrease as the temperature rises. NH4HS(s) <===> H2S(g) + NH3(g); DH° = 83.47 kJ and DG° = 17.5 kJ at 25°C. - A. B. C. D. E. F. Kp = - A. B. C. D. E.
  91. chemistry

    Uranium metal can be produced by reaction of uranium tetrafluoride (UF4) with calcium metal (Ca). The by-product of this reaction is calcium fluoride (CaF2). The reactor is charged with 292.0 kg of UF4 and 47.0 kg of calcium. Assume that the reaction goes
  92. Physical Science

    Hi! Thanks for checking my question out! ____ 1. Methane, CH4, burns in oxygen gas to form water and carbon dioxide. What is the correct balanced chemical equation for this reaction? (1 point) a) CH4 + O --> H2O + CO2 b) CH4 + 4O --> 2H2O + CO2 c)
  93. CHEMISTRY> HELP QUICK! pls

    Use the following thermodynamic data at 298 K to determine the equilibrium constant at this temperature for the reaction of iron in steam to form hydrogen and iron(III) oxide. 2Fe(s) + 3H2O(g) 3H2(g) + Fe2O3(s) Substance Fe(s) H2O(g) H2(g) Fe2O3(s) ÄH°f
  94. Chemistry

    A student ran the following reaction in the laboratory at 651 K: 2 NH3(g) N2(g) + 3 H2(g) When she introduced 8.75E-2 moles of NH3(g) into a 1.00 Liter container, she found the equilibrium concentration of H2(g) to be 0.119 M. Calculate the equilibrium
  95. applied chemistry

    the equilibrium contant kc=49 at 230^0C, for the reaction PCl3 + Cl2= PCL5. If 0.50mol of each of phosphorus trichloride and chlorine are added to a 5.0L reaction vessel, what is the equilibrium composition of the mixture at 230 degrees celcias?
  96. Chemistry

    A student ran the following reaction in the laboratory at 650 K: H2(g) + I2(g) 2 HI(g) When she introduced 0.204 moles of H2(g) and 0.229 moles of I2(g) into a 1.00 Liter container, she found the equilibrium concentration of I2(g) to be 5.77E-2 M.
  97. Chemistry

    What type of reaction may be occurring when a person's skin develops a green stain beneath a 14 K gold bracelet? Using HA as the chemical formula for acid in skin, write a balanced chemical equation to represent the reaction.
  98. Applied physics

    the equilibrium contant kc=49 at 230^0C, for the reaction PCl3 + Cl2= PCL5. If 0.50mol of each of phosphorus trichloride and chlorine are added to a 5.0L reaction vessel, what is the equilibrium composition of the mixture at 230 degrees celcias?
  99. Chemistry

    Consider the following reaction: CO(g)+2H2(g)⇌CH3OH(g) Kp=2.26×104 at 25 ∘C. Calculate ΔGrxn for the reaction at 25 ∘C under each of the following conditions. A) Standard Conditions B) at equilibrium C)PCH3OH= 1.3atm ; PCO=PH2=
  100. Chemistry

    Consider the reaction 2 SO2(g) + O2(g) in equilibrium with 2 SO3(g) . At 25°C delta H° = -197.78 kJ and delta S° = -187.95 J/K. Using this information, calculate the equilibrium constant for the reaction at -32°C. (R = 8.314 J/K) Enter your answer