1. Chemistry

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

    What is n, the number of moles of electrons transferred, in the following reaction? 2 MnO4-(aq) + 16 H+(aq) + 10 Cl-(aq) ===> 2 Mn2+(aq) + 5 Cl2(g) + 8 H2O(l).
  3. chemistry 12

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

    true /false for every action, there is an equal and opposite reaction is best defined as Newton's Third Law
  5. chemistry

    The basicity of tetraoxosulphate(6) is 2. explain this statement with an equation showing the reaction between the acid and potassium hydroxide
  6. chemistry

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

    20. What is the molecular formula for alkane, alkenes and alkynes? 15.What happens to a reaction at equilibrium when more reactant is added to the system?
  8. chemistry

    The rate constant for this first-order reaction is 0.0570 s–1 at 400 °C. A-->Products After how many seconds will 14.0% of the reactant remain?
  9. chemistry

    Please help again. How many grams of lithium are required to completely react with 70.7 mL of N2 gas at STP when given the following reaction: 6Li + N2 = 2Li3N
  10. chemistry

    In the reaction of sodium metal with oxygen gas, the formula of the product will be ______________. Periodic Table
  11. Chemistry

    Which of these is best described as an acid-base reaction? KCl + NH4NO3 = KNO3 + NH4Cl NH3 + H2O = NH4 + OH
  12. Chemistry

    Write the balanced equation for the double replacement reaction of: Barium chloride and Sulfuric acid
  13. Chemistry

    What would the reaction of these two look like (reactants and products) A) hexanal is reduced B) Butanoic acid is neutralized by potassium hydroxide
  14. Chemistry

    Which of these is best described as an acid-base reaction? KCl + NH4NO3 = KNO3 + NH4Cl NH3 + H2O = NH4 + OH
  15. science

    why did the balance record a decrease in mass during the reaction betwwn iron sulphide and hydrochloric acid?
  16. Chemistry

    in a neutralization reaction, dilute tetraoxosulphate (vi) acid completely reacted with sodium hydroxide solution
  17. 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?
  18. 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?
  19. 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?
  20. Chemistry

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

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

    What physical property of water and HCl allows us to separate them from the zinc chlorine compound produced in the reaction?
  23. Chemistry

    Which of these is best described as an acid-base reaction? KCl + NH4NO3 = KNO3 + NH4Cl NH3 + H2O = NH4 + OH
  24. Chemistry

    Which of these is best described as an acid-base reaction? KCl + NH4NO3 = KNO3 + NH4Cl NH3 + H2O = NH4 + OH
  25. 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
  26. 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.
  27. chemistry

    For the following reaction, identify the substances oxidized, reduced and the oxidizing and reducing agents? 2SO2 + O2 --> 2SO3
  28. Chemistry

    A chemist ran the reaction and obtained 5.70 of ethyl butyrate. What was the percent yield? How do I solve this problem?
  29. i hate.."chemistry"

    write the balanced half reaction for the conversion of HOBr(aq) to Br2(aq) in acidic solution
  30. 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.
  31. Chemistry

    The rate constant for this first order reaction is 0.0470 s-1 at 400 C. A TO Products After how many seconds will 11.0% of the reactant remain?
  32. physics

    Calculate the energy released in the fusion reaction 2 3 4 1 1 H + 1 H->2 H +0 n. The atomic mass of 3 1 H (tritium is 3.016049 u. I am lost! help please!
  33. chemistry

    How many grams of Mg(OH)2 would be produced from 4 mol KOH? if the balanced reaction is MgCl2 +2KOH arrow Mg(OH)2 + 2KCl?
  34. medical language

    what are the interrelations of blood clotting, immune response, allergic reaction and hormone release.
  35. 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
  36. Chemistry

    Write the equation for the reaction by which aspririn decomposes in an aqueous ethanol solution. C9H8O4 + C2H6 --> ?
  37. Chemistry

    What amount of ammonium sulfate is produced by the reaction of 8.48g of ammonia with 24.50g sulfuric acid?
  38. Chemistry

    Redox Reactions Can anyone help predict the reaction that will take place when Gold is put into a solution of Hydrochloric Acid?
  39. Chemistry

    What is the concentration of the Mg2 ion in solution when [CO3-2] = 0.25M given that the Ksp= 6.82 x 10-6 for the following reaction MgCO3-------->Mg +. CO32-
  40. chemistry

    What assumption did you make about the reaction of KMnO4 solution in those determinations where temp didn't change to allow k to be a constant?
  41. chemistry

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

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

    What kind of reaction is occurring between potassium permanganate and cyclohexene? (I.e. Combination, double displacement, etc.
  44. Chemistry

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

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

    Identify the acid or base behavior of each substance in this reaction: H2PO4 + H2O <----> H3O+ + HPO4-
  47. Science

    How would you prove that sodium hydroxide is a base without using a litmus paper to test? Give the equation for the reaction?
  48. Chemistry

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

    Formic acid is only readily soluble in water and in both 0.6 M NaHCO3 and 2.5 M NaOH. give a brief explanation of the reaction for each
  50. physics

    Determine the stopping distances for a car with an initial speed of 93 km/h and human reaction time of 3.0 s for the following accelerations: -4.00 m/s^2 -8.00 m/s^2
  51. physics

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

    Write the word equation to show the chemical reaction taking place during acid rain?
  53. 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
  54. Chemistry

    If 25.0 mLs of 0.150M nitric acid was used, how many grams of barium carbonate would be required for complete reaction?
  55. Chemistry

    Enter the net ionic equation, including phases, for the reaction of AgNO3(aq) with BaO(aq). Is it... Ag+O2--->AgO?
  56. chem

    How many grams of NH3 are required to make 52.7g H2O in the following reaction : 4NH3+6NO->5N2+6H2O
  57. chemistry

    Consider the reaction 3CH4(g)= C3H8(g)+ 2H2(g). Using data from Appendix C in the textbook, calculate delta G at 298 K.
  58. chemistry

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

    Complete and balance the precipitation reaction. Include physical states in your answer. CuCI2(aq)+Na2CO3(aq)
  60. Chemistry

    Formic acid is only readily soluble in water and in both 0.6 M NaHCO3 and 2.5 M NaOH. give a brief explanation of the reaction for each
  61. Biology

    How do u figure out the initial rate of an enzymatic reaction when they only give the time in seconds and the product formed?
  62. Mathematics

    Can someone check my answers? 1. For the data in the table, does y vary directly with X? If it does write an equation for the direct variation.(X,y) (8,11) (16,22) (24,33) Yes y=2.75x Yes y=0.6875x*** Yes y=1.375x No y does not vary directly with X ** (For
  63. verbs

    While he was biking this morning, Zach had seen a small accident. A huge SUV ran a red light, and the oncoming sedan was unable to stop. Driving on Portland's narrow streets was dangerous and expensive. the small dent in the sedan would cost hundreds to
  64. Chemistry

    For a particular reaction at 195.1 °C, ΔG = -1488.09 kJ/mol, and ΔS = 288.67 J/(mol·K).? Calculate ΔG for this reaction at -20.0 °C. delta G = delta H - (T*delta S) -1488.09 kJ/mol = (delta H) - ((461.8K)*(+288.67 J/(mol x K))*(1 kJ/1000
  65. Chem Dr. Bob Plz

    Dr. Bob, I just did a home lab with citric acid and sodium bicarbonate and had to put them in cups and measure before and after.. I put 1.02g of sodium bicarbonate in a cup with water and stirrer (54.66g) then added .77g of citric acid and supposed to add
  66. Chemistry

    A plasma reaction converts A (Molecular weight = 200) to B and uses NAD as a co-substrate and produces NADH as a by product (1 mole of NADH is produced per every 1 mole of A converted to B). The amount of NADH can be determined by monitoring its’
  67. Algebra

    I was asked to use factoring and the zero-product property to solve the following problems. Can you please check my answers? Thank you. z(z - 1)(z + 3) = 0 is already factored, so one of the factors must be zero for the product to be zero. Taking them in
  68. possessive nouns

    Write the noun in this sentence so it shows possession. The bus driver is named Mr. Ed. Would it be? The bus's driver is named Mr. Ed. I personally think the sentence should be rewritten to read, The bus driver's name is Mr. Ed The second sentence is
  69. math

    Kyle wants to form rectangles using straws.he has two straws of 6 inches long, two straws 4 inches long, and two straws 2 inches long.using four straws attached at the ends, how many different rectangles can Kyle form¿ what are the perimeters of the
  70. Social Studies

    Four statements by Enlightenment writers: 1. To secure these rights, Governemts are instituted among Men, deriving their just powers form the consent of the governed. 2. When a Monarchy is once bitten it the quick, by those Democratical writers...It wants
  71. 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
  72. 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
  73. Chem

    Hi! I need help with this question: Sulfur dioxide reacts with chlorine at 227 oC: SO2(g) +Cl2(g) ↔ SO2Cl2(g) Kp for this reaction is 5.1 x 10-2 atm-1. Initially, 1.00 g each of SO2 and Cl2 are placed in a 1.00 L reaction vessel. After 15 minutes,
  74. English

    Paul ring the church bells at a moment's notice. Change the possessive to its longer form. The possessive is MOMENT'S. Please explain what you mean by your question-- Change the possessive to its longer form. WELL LIKE IF GIRL'S IS THE POSSISSVE THEN U
  75. Chemistry- Dr.Bob!

    Combustion of natural gas (primarily methane) occurs in most household heaters. The heat given off in this reaction is used to raise the temperature of the air in the house. Assuming that all the energy given off in the reaction goes to heating up only the
  76. Biology/Chemistry

    What kind of isomers can amino acids form? Which isomer is present in most living organisms? don't major compounds of living organisms consist of modifications of hydrocarbons Although D amino acids can be found in nature, only the L isomers are used to
  77. chem

    I can't seem to figure this out! I know I have to use mass to mass conversions though. Can someone help me out? Hydrochloric acid can dissolve solid iron according to the following equation: Fe + 2HCl to form FeCl2 + H2 a) How much HCl in grams would you
  78. English (Check)

    For each noun listed, write one sentence using the singular possessive form and another using the plural possessive form. 1. passenger Singular Possessive: The passenger's seat was uncomfortable during the entire flight. Plural Possessive: The passengers'
  79. Chemistry

    1) How does the atomic radius change from left to right across a period in the periodic table? A) It tends to decrease*** B)It tends to increase C) It first increases, then decreases D) It first decreases, then increases 2) What is the charge of a cation?
  80. Chemistry

    1) How does the atomic radius change from left to right across a period in the periodic table? A) It tends to decrease*** B)It tends to increase C) It first increases, then decreases D) It first decreases, then increases 2) What is the charge of a cation?
  81. 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
  82. Macro economics

    Paper currency is the most easily recognized form of money. How well does paper currency serve the functions of money if we have an inflation rate of 50-percent per year? b) Gold is also recognized as a form of money. How well does gold serve the functions
  83. math

    Suppose 100 dots are arranged in a square 10 × 10 array, and each dot is colored red or blue. (a) Prove that this array must contain a “monochromatic” rectangle. That is, no matter how the red and blue colors are assigned, there must be either a set
  84. 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
  85. 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
  86. physics

    A horizontal spring mass system is set up to keep time so that it goes from one side to the other in 6 seconds. The mass used in this system is 0.69 kg. The distance from one side to the other is 2.4 m. What spring constant should be used if it is to
  87. Comprehensive grammar

    subject verb agreement:have or has " " " -reqire or requires " " " are not or is not regular and irregular verbs: are not or is not. become or became, taken or took, lay or laid. correct form of be and have in the present tense. was or am. verb form and
  88. 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.
  89. Evolution

    In natural populations of the intertidal copepod Finistra elegans, variation exists for two color morphs: a light brown form and a light green form. A student estimates the frequency of the light brown copepod to be 12%, 15%, and 17% over three consecutive
  90. 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
  91. math

    How do I write one equations in slope-intercept form, and three other lines in slope-intercept form that are perpendicular to the first line ?? -- one line: y=mx+b second line perpendicular y= -x/m + c of course, you have to know m, b, c. ----- for the
  92. 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
  93. Maths

    1)There 40 pupils in a class. There is chart so i counted the number of boys and the number of girls Boys-24 Girls- 16 what is the ratio of girls to boys in the class? Answer in simplest form My answer- 16:24 4:6 (ratio in simplest form) is this correct?
  94. MATH- Algebra 2

    Solve each quadratic in form equation. 1. 4y^4+9=13y^2 2. x-3x^1/2+2=0 3. (x-5)^2+2(x-5)-35=0 4. (x-2)^2-3x-2)+2=0 5. 2(x^2-5)^2-13(x^2-5)+20=0 6. 2x^2/3+5x^1/3-6=0 7. 6x^2/3-5x^1/3-6=0 8. x^-2+4x^-1=12 9. x^4-8x^2+7=0 10. x^4-2x^2-35=0 can someone please
  95. math

    Find the standard form of the equation of the line that is perpendicular to -6x+5y=-6 and contains (8, -6)
  96. Chemistry

    Most of the matter in the universe is of which element? How and where do elements more complicated than this form?
  97. Algebra2

    What is the vertex form of the equation? Show steps y=-x^2+12x-4
  98. Math

    Express 5 quarts to 5 gallons as a fraction in simplest form.
  99. co-ordinates

    For what values of 'x' and 'y' will the points (0,0), (3,root3) and (x,y) form an equilateral triangle?
  100. Math

    Need help with a few: Perform the indicated operation. Write your answer in simplest form: 4|5 / 20|3