1. Chem

    The value of ƒ¢H‹ 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) *I just want to how to solve this problem as in an equation, not the answer.
  2. Chemistry: Stoichiometry

    calculate the number of oxygen needed to oxidize 12.5grams of glucose (C6H12O6) into carbon dioxide and water. (Combustion reaction)
  3. Chemisty

    The value of ∆Ho for the reaction below is -1107 kJ: 2Ba(s) + O2(g) → 2BaO(s) How many kJ of heat are released when 15.75 g of Ba(s) reacts completely with oxygen to form BaO(s)? A) 35.1 B) 114 C) 70.3 D) 20.8 E) 63.5
  4. Biology

    An individual is born with a genetic abnormality that causes a reduction in the myelin found around a neuron. How might this disorder affect reaction rate? Explain your answer.
  5. General Chemistry

    The value of delta H for the reaction below is -6536 kJ. ____kJ of heat released in the combutsion of 16.0g of C6H6. 2C6H6(l) + 15O2(g) yield 12CO2(g) + 6H2O
  6. College Chemistry

    One liter of benzene (C6H6) is completely burned (oxidized) with air. Write a balanced chemical equation to represent this reaction.
  7. Chemistry

    60.0 mL of 3.40 M sodium hydroxide is combined with 39.0 mL of 1.50 M magnesium chloride. What mass in grams of solid forms? (Hint: the total or overall reaction is most useful in doing calculations.) I got 485.1
  8. Chemistry

    Calculate how many grams of the product(s) would be produced by complete reaction of 0.125 mole of the first reactant. CaCO3 + 2HCl --> CaCl2 + CO2 + H2O
  9. Chemistry

    Complete the Bronsted- Lowry reaction, placing each product by its appropriate label. HCO3^-+HNO2 (double arrows) need a spot for acid and for base.
  10. chemistry

    what are the general reactants and products in a fermentation reaction? thanks http://www.crocodile-clips.com/absorb/AC4/sample/LR1507.html
  11. chemistry

    if 45 g of calcium carbide reacts with 23 g of water, how many liters of acetylene can be produced, assuming the reaction goes to completion at 60 degrees fahrenheit and 763 mmHg
  12. Chemistry

    Equal masses of P and Cl react according to the following equation: 2P + 3Cl2 --> 2PCl3 Identify which reagent is in excess. Calculate the percent that will remain at the end of the reaction.
  13. Chem 132

    The rate constant for this first-order reaction is 0.650 s–1 at 400 °C. A------> Products How long (in seconds) would it take for the concentration of A to decrease from 0.660 M to 0.350 M?
  14. Chemical Kinetics

    When experimentally determining the rate law, i am getting a negative fraction. is that right or am i doing something wrong? It is possibly right. I'd have to see you calculations to determine that. It would mean that the reaction is proceeding backwards.
  15. Chemistry

    Under acidic conditions, MnO4− becomes Mn2+. Write the balanced half-reaction for this transformation. (Omit states-of-matter from your answer.)
  16. chemistry

    A 31.5 ml aliquot of H2SO4 of an unknown concentration was titration with 0.0134 M NaOH. write the balanced chemical reaction with the correct states of matter.
  17. 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?
  18. science

    A test liquid has a density of 1.1 g/ml. When you pour some of it into a cup of water, what will happen (assuming that their natures are such that they don't mix and that there is no chemical reaction between the two substances)?
  19. chemistry

    Mno4- + So3-2 = Mno2 + sO4-2 (in neutral solution,but H+ ions will appear in the final question) solve this redox reaction and give me the method also Thank you
  20. Chemistry

    How could the following transformation could be carried out. C6H5C=CH --> C6H5CH2CH20H I don't know how you would get a primary alcohol because I thought that following Markovnikov's rule any reaction would involve addition onto the other carbon.
  21. college chemistry

    I need to know how to calculate the value of the equilibrium constant for the reaction of zinc metal in a solution of silver nitrate at 25 degrees c. I am totally lost and do not even know if I have all the data I need. Help!
  22. chemistry

    How to balanced chemical equation and identify the type of reaction for solid ammonium nitrate decomposes into dinitrogen monoxide gas and water
  23. science

    ht tp :/ /i1. ti nypi c.c om/ 7yr papx.j pg I did this experiment about antacids and my hyppothesis is that "If I use the generic antacid to create a neutralization reaction, it will have the same effectiveness of the name brand because...." I'm not sure
  24. Chemistry

    The rate constant for this first order reaction is 0.440s-1at 400 C. A to products How long(in seconds) would it take for the concentration of A to decrease from 0.740 M to 0.290 M?
  25. chemistry

    Suppose you have the following reaction at equilibrium: N2(g) + 3H2(g) = 2NH3(g), ΔH = −22 kcal/mol What changes are expected to occur if the temperature of the system was decreased. You may select multiple answers. The concentration of NH3(g)
  26. math

    Baseball Nick throws a baseball upward with an initial velocity of 60 feet per second. What is the maximum height of the ball after Nick releases the ball? Formula for the problem - h(t)=v0t-16t^2, h(t)= the height of an object in feet, v0=an object's
  27. Differential Equations (Another) Cont.

    For the following initial value problem: dy/dt=1/((y+1)(t-2)) a)Find a formula for the solution. b) State the domain of definition of the solution. c) Describe what happens to the solution as it approaches the limit of its domain of definition. Why can't
  28. Thermophysic and electromagnetisme

    A tank of volume V = 2.0 l will burst if the pressure exceeds 100 atm. The tank is filled with 6.0 mole of an ideal gas at a temperature of 23 ° C. We heat the tank. a)What is the initial pressure in the tank? b)At what temperature we can heat the tank
  29. Physics

    A class of 11 students taking an exam has a power output per student of 122 W. Assume that the initial temperature of the room is 18.8oC and that its dimensions are 6.40 m by 14.5 m by 3.50 m. What is the temperature (in oC, do not enter units) of the room
  30. Math

    Question2: a gardener with 5770 plants to arrange them such that the number of rows of plants equals the number of plants in each row. When he does so,he discovers that the number of plants falls short by 6 .find the number of rows the gardener wants to
  31. Chemistry

    When 32.0 mL of 0.560 M H2SO4 is added to 32.0 mL of 1.12 M KOH in a coffee-cup calorimeter at 23.50°C, the temperature rises to 30.17°C. Calculate H of this reaction per mole of H2SO4 and KOH reacted. (Assume that the total volume is the sum of the
  32. History hellp pleasse

    Hi please help with my question Even if you didn't mind the consequences , why would you still be very unwilling to speak out against hitler and the Nazi ? Please help That is obviously a personal opinion you need to decide on and then be able to explain.
  33. Science 10

    Here are the results of the 3 trials of dissolving equal masses of marble in hydrochloric acid listed from fastest to the slowest. List concentration, surface area, and temperature in decreasing order of their important in increasing the rate of this
  34. chem

    A 0.70 g mixture of Cu and CuO was treated with hydrogen at elevated temperature. CuO was reduced to Cu and water was formed. (a) Write a balanced equation for the reaction. (2 marks) (b) Before the experiment, calculate the minimum amount (in mole) of
  35. physics

    Two balls of equal mass collide and stick together as shown in the figure. The initial velocity of ball B is twice that of ball A. (Take è = 34°.) (a) Calculate the angle above the horizontal of the motion of mass A + B after the collision. 1 Units are
  36. Physics

    A shell is fired from the ground with an initial speed of 1.68 103 m/s at an initial angle of 37° to the horizontal. (a) Neglecting air resistance, find the shell's horizontal range. m (b) Find the amount of time the shell is in motion. s
  37. physics

    A shell is fired from the ground with an initial speed of 1.54 103 m/s at an initial angle of 46° to the horizontal. (a) Neglecting air resistance, find the shell's horizontal range. m (b) Find the amount of time the shell is in motion. s
  38. General Physics

    A block sliding on a horizontal surface has an initial speed of 0.5 m/s. The block travels a distance of 1 m as it slows to a stop. What distance would the block have traveled if its initial speed had been 1 m/s? 1. 2 m 2. 1 m 3. more information is needed
  39. Physics

    A car with a mass of 100 kg, with initial v = 1 m/s, has 60 Joules of energy added for 50 m. What is the final velocty? I'm using KE = 1/2 mv^2 to find initial KE. Then add 600 J to this for the final KE. Thus, W = KFf - KEi; KEf = W + KEi and KEf =
  40. algebra

    Use the formula 4.9t^2 +vot=s, where t is the time in seconds, vo is the initial velocity, and s is the distance in meters. Approximately how far will an object fall in 4 seonds, if it is thrown downward at an initial velocity of 20 meters per second (vo)
  41. PHYSICS

    A baseball is thrown with an initial velocity of magnitude v at an angle of 21.8 with respect to the horizontal (x) direction. At the same time, a second ball is thrown with the same initial speed at a different angle A with respect to x. If the two balls
  42. Physics

    the volume of a monoatomic ideal gas doubles in an adiabatic expansion. by considering 135 moles of gas with an initial pressure of 330kPa and an initial volume of 1.2m^3, the gas is then expands adiabatically to a volume of 2.4m^3. FIND THE WORK DONE BY
  43. physics

    A shell is fired from the ground with an initial speed of 1.58 103 m/s at an initial angle of 31° to the horizontal. (a) Neglecting air resistance, find the shell's horizontal range. m (b) Find the amount of time the shell is in motion. s
  44. Physics

    A particle moved along the x axis with a constant acceleration of -85.0 meters per second squared. The initial position of the particle was at the origin and its initial velocity was +325 meters per second. Find the position of the particle at T=4.0
  45. Chemistry

    How many moles of propane are expected from the complete reaction of 82.8 g of propene? How many grams of propane are expected from the complete reaction of 101 g of propene? Kyle-- Here is a problem I worked last night for Kira (about half way down the
  46. chemistry

    Mare is preparing an experiment using 3 cups, one made of paper, one of plastic and one of glass. She plans on pouring 50 ml of hot water from a pitcher into each of the 3 cups and record the temperature in 5 minute intervals. What is the independent
  47. Physics

    Two children are playing on two trampolines. The first child can bounce 1.6 times higher than the second child. The initial speed up of the second child is 5.2 m/s. (a) Find the maximum height the second child reaches. (b) What is the initial speed of the
  48. Chemistry

    If argon has a volume of 5.0 dm3 and the pressure is .92 atm and the final temperature is 30 degrees celcius and the final volume is 5.7 L and the final pressure is 800 mm Hg, what was the initial temperature of the argon?
  49. Chemistry

    home / study / science / chemistry / questions and answers / a subtilisin with an active site mutation of his ... Question: A subtilisin with an active site mutation of His t... EDIT QUESTION A subtilisin with an active site mutation of His to Ala had a
  50. CHEMISTRY........

    i TRIED TO DO IT, BUT MY ANSWERES ARE WRONG. Please show work and explain. 1. If 29.0 L of methane, CH4, undergoes complete combustion at 0.961 atm and 140°C, how many liters of each product would be present at the same temperature and pressure? 2 If air
  51. Physics

    A ball traveling horizontally leaves a 0.80 m high table and lands 1.1 meter away. A. Predict the time required for the pool ball to hit the ground. B. What was the initial velocity of the ball?
  52. Chemistry(Please respond, thank you)

    The ionization constant of HA is 4.0e-4. Using the ice table what is the equilibrium concentration of HA in terms of its initial concentration and x? HA(aq) + H2O(l) = H3O^+^(aq) + A^-^(aq) I 0.040M OM OM C -X +x +x E ? x x I thought that to find the
  53. Chemistry

    1.) Watch the animation, and observe the titration process using a standard 0.100 M sodium hydroxide solution to titrate 50.0 mL of a 0.100 M hydrochloric acid solution. Identify which of the following statements regarding acid-base titrations are correct
  54. Physics

    A shell is fired from the ground with an initial speed of 1.54 ✕ 103 m/s at an initial angle of 52° to the horizontal. (a) Neglecting air resistance, find the shell's horizontal range. (b) Find the amount of time the shell is in motion.
  55. physics

    Is initial velocity can be negative? in this case, A stone is dropped from a ballon while ascending at the rate of 8mps. The stone reaches the ground in 6 sec. What is the height of the balloon when the stone was dropped? What is the sign for the initial
  56. Physics

    A 15-g bullet is fired horizontally into a 3.000-kg block of wood suspended by a long cord. The bullet sticks in the block. Compute the speed of the bullet if the impact causes the block to swing 10 cm above its initial level. Initial Velocity of
  57. Chemistry

    Zinc dissolves in acid according to the balanced reaction: Zn(s) + 2H^+(aq) -> Zn^2+(aq) + H2(g) A sample of zinc is placed in the ice calorimeter. If 0.0657g of zinc causes a decrease of 0.109mL in the ice/water volume of the calorimeter, what is the
  58. chemistry

    Let me repost the important information only: Purpose: The purpose of this experiment is to determine the Ksp for calcium hydroxide. Materials are: *50.0 mL of 0.10 M HCl(aq) *bromophenol blue indicator *50.0 mLsaturated calcium hydroxide *50.0 mL buret
  59. Chemistry

    A 150.0 mL sample of a 1.50 M solution of CuSO4 is mixed with a 150.0 mL sample of 3.00 M KOH in a coffee cup calorimeter. The temperature of both solutions and the calorimeter was 25.2°C before mixing and 31.3°C after mixing. The heat capacity of the
  60. Chemistry

    If 50.00mL of 1.10M NaOH is added to 25.00mL of 1.86M HCl, with both solutions originally at 24.70 degrees Celsius, what will be the final solution temperature? (Assume that no heat is lost to the surrounding air and that the solution produced in the
  61. Physics

    A ball is thrown directly upward with an initial velocity of 14 m/s. If the ball is released from an initial height of 2.8 m above ground, how long is the ball in the air before landing on the ground? Ignore air drag.
  62. physics

    Two children are playing on two trampolines. The first child can bounce 1.4 times higher than the second child. The initial speed up of the second child is 4.8 m/s. The maximum height of the second child is 1.17m and the initial speed of the first child is
  63. Physics

    A ball is thrown directly upward with an initial velocity of 12 m/s. If the ball is released from an initial height of 2.9 m above ground, how long is the ball in the air before landing on the ground? Ignore air drag.
  64. Calculus

    The radioactive element polonium decays according to the law given below where Q0 is the initial amount and the time t is measured in days. Q(t) = Q0 · 2-(t/140) If the amount of polonium left after 700 days is 45 mg, what was the initial amount present?
  65. Physics

    Two children are playing on two trampolines. The first child can jump one and a half times higher than the second child. The initial speed of the second child is 5 m/s. What is the maximum height of the second child? What is the initial speed of the first
  66. Chemistry-Thermochemistry (grade 12)

    A 65.0 g sample of 0.600 M HI at 18.46 degrees celsius is added to 84.0 g of solution containing excess KOH, also at 18.46 degrees celsius. The final temperature is 21.96 degrees celsius. Calculate the enthalpy of H for the reaction. Assume the specific
  67. ap calculus

    The height s of a ball, in feet, thrown with an initial velocity of 112 feet per second from an initial height of 6 feet is given as a function of time t (in seconds) by s(t)=-16t^2+112t+20. 1. What is the maximum height of the ball? 2. At what time does
  68. science (chemistry)

    why does the pH of the acid solution initially increase very slowly when metal is first added to the acid solution, but gradually increase at a faster rate as the reaction proceeds to completion? I thought it may be because the metal is just then being
  69. physic

    A golfer hits his approach shot at an angle of θ = 52.8°, giving the ball an initial speed of v0 = 37.0 m/s (see figure below). The ball lands on the elevated green, yf = 5.3 m above the initial position near the hole, and stops immediately. (a) How much
  70. physics

    A cherry bomb explodes into three pieces of equal mass. One piece has an initial velocity of 12m/sx^. Another piece has an initial velocity of 7.0m/sx^−5.0m/sy^. Part A What is the velocity of the third piece? Enter the x and y components of the
  71. Algebra

    I am very confused as to how to make a table with the range of values I have this y=-1/2x-4 my table layout is similar to this; x_y_(x,y) ?_-1_? -2_?_? ?_-4_? 2_?_? 8_?_? **note** I used the underscore to separate the x,y and X,y to kind of make a chart.
  72. Physics

    A neutron collides elastically with a helium nucleus (at rest initially) whose mass is four times that of the neutron. The helium nucleus is observed to rebound at an angle θ'2 = 44° from the neutron's initial direction. The neutron's initial speed
  73. Physics

    A neutron collides elastically with a helium nucleus (at rest initially) whose mass is four times that of the neutron. The helium nucleus is observed to rebound at an angle θ'2 = 44° from the neutron's initial direction. The neutron's initial speed
  74. chemistry

    A sample of naphthalene (C10H8) that has a mass of 0.7200 g is burned in a bomb calorimeter. The mass of the calorimeter is 1.580 kg, and its specific heat is 2.55 J/(g °C). As a result of the reaction, the temperature of the calorimeter increases from
  75. algebra

    y=(v/u)x+(g)/(2(u^2))*x^2 where y is the object's vertical distance (in feet) above from where it was thrown x is the object's horizontal distance (in feet) away from where it was thrown and u is the objects' initial horizontal velocity v is the object's
  76. Chemistry

    The question is "the reaction CO + SO3 <=> CO2 + SO2 has two possible mechanisms. If the rate law for this reaction is rate=k[SO3] which mechanisms is correct? which step in THAT mechanisms is the slow step? and the mechanisms are: mechanism 1 CO + @
  77. chemsitry

    c. Use the enthalpy diagram provided above and apply Hess’s Law to determine the standard enthalpy of formation for C12O36H20N12 (s) using the results from part (a) and the following values: The standard enthalpy of formation of gaseous carbon dioxide is
  78. Chemistry(Please help, thank you!)

    How would I find the molality of NaCl with the following information? initial temperature= 98degrees celsius final temp=100 degrees celsius. Kbp(water)=0.512
  79. Chemistry

    How would I find the molality of NaCl with the following information? initial temperature= 98degrees celsius final temp=100 degrees celsius. Kbp(water)=0.512
  80. algebra 2B

    5. Come up with a new linear function that has a slope that falls in the range −1 < m < 0 . Choose two different initial values. For this new linear function, what happens to the function’s values after many iterations? Are the function’s
  81. Chemistry

    What would be the concentration of dinitrogen pentoxide after 6.00 X 10(2) seconds and how long would it take for the concentration of N2O2 to decrease to 10.0% of its initial value in the following equation... N2O5 to NO2 and O2 initial concentration is
  82. physic

    The initial velocity and acceleration of four moving objects at a given instant in time are given in the following table. Determine the final speed of each of the objects, assuming that the time elapsed since t = 0 s is 2.2 s.
  83. physics

    a ball is thrown upward. its initial verticle component of velocity is 10 m/s and its initial horizontal component of velocity is 2 m/s. what is the ball's speed 10 s later?
  84. Physics 2

    Calculate the maximum height using the initial speed, half-time, and angle. The initial speeed is 9.8m/s, half time is 1.8, and the angle is 75.
  85. chem.

    Hey this is my question: At a temperature of 300°C and a pressure of 40.5 MPa, 90.0 mol of H2(g) and 80.0 mol of N2(g) are injected into a reaction vessel. When equilibrium is established, 37.0 mol of NH3(g) are present. The number of moles of H2(g)
  86. chemistry

    If heat of reaction, Ca(s) + 2H+(aq) Ca2+(aq) + H2(g) , is - 544 kJ/mol, heat of reaction, CaO(s) + 2H+(aq) Ca2+(aq) + H2O(l) , is -192 kJ/mol. and heat of formation of water is -286, what is heat of CaO? Ca(s) etc is equation 1. CaO + 2H^+ etc is equation
  87. Physics

    An ideal gas is compressed at constant pressure to one-half its initial volume. If the pressure of the gas is 120 kPa, and 760 J of work is done on it, find the initial volume of the gas.
  88. Chemistry

    Bromine and chlorine gas react to give bromine monochloride (BrCl) according to Br2(g)+Cl2(g)⇌2BrCl(g) Given initial concentrations [Br2]=1.50 mol L-1, [Cl2]=0.90 mol L-1 and [BrCl]=0 and K=7 determine (to two decimal places) the equilibrium
  89. Chemistry

    I am having a hard time solving this problem. The formula given is: T=Tin - (Tin - Tinit.)e(-v/v)t If the initial temperature Tinit is 115 (degrees F), the cold water temperature is 35 (degrees F) (1.7 degrees C), and the volume and volumetric flow rate
  90. Science

    At a given temperature and pressure, the volume of a gaseous sample is directly proportional to the moles of gas (volume = C * moles, where C is a constant). Assuming that the tempreature and pressure is the same for the reaction of magnesium with HCl(aq)
  91. Science

    At a given temperature and pressure, the volume of a gaseous sample is directly proportional to the moles of gas (volume = C * moles, where C is a constant). Assuming that the tempreature and pressure is the same for the reaction of magnesium with HCl(aq)
  92. Chemistry

    When 35.0 mL of 1.43 M NaOH at 22.0 degres Celsius is neutralized by 35.0 mL of HCL also at 22.0 degrees Celsius in a coffee-cup calorimeter, the temperature of the final solution rises to 31.29 degrees Celsius. Assume that the specific heat of all
  93. College Chemistry

    A 150.0 mL sample of a 1.50 M solution of CuSO4 is mixed with a 150.0 mL sample of 3.00 M KOH in a coffee cup calorimeter. The temperature of both solutions and the calorimeter was 25.2°C before mixing and 31.3°C after mixing. The heat capacity of the
  94. Chemistry

    A 150.0 mL sample of a 1.50 M solution of CuSO4 is mixed with a 150.0 mL sample of 3.00 M KOH in a coffee cup calorimeter. The temperature of both solutions and the calorimeter was 25.2°C before mixing and 31.3°C after mixing. The heat capacity of the
  95. Science

    At a given temperature and pressure, the volume of a gaseous sample is directly proportional to the moles of gas (volume = C * moles, where C is a constant). Assuming that the tempreature and pressure is the same for the reaction of magnesium with HCl(aq)
  96. physics

    Assume a projectile is launched from ground height over a flat plane, at an angle of 50 degrees above the horizontal with an initial speed of 100 m/s. What is the initial velocity of the projectile parallel to the ground (in the x direction) and
  97. Physics

    A quarterback throws a pass at an angle of 40 degrees above the horizontal with an initial speed of 20 m/s. The ball is caught by the receiver 2.55 seconds later. Determine horizontal velocity, vertical initial velocity, the distance ball was thrown, and
  98. Physics

    a block of mass 2kg moves on a frictionless inline (none of the forces on the block are shown). its initial velocity is v initial=3m/s, and it slides a vertical distance h=10m up the slope and its final velocity is v final=2m/s. find the external work done
  99. Chemistry

    Le Chateleir`s Principle Please check if my answers are right and i dunt know some of them: Consider the following system at equilibrium: A(aq)+B(aq) <---> 2C(aq) Classify each of the following actions by whether it causes a leftward shift, a
  100. Chemistry (Check)

    Determine the type of chemical reaction, find the limiting reagent, determine the amount of product in grams, and the amount in grams of excess reagent. Calcium nitrate is decomposed with heat to give calcium nitrite and oxygen gas. Start with 15.99g of