1. physics

    if acceleration is -9.8, initial velocity is 10, initial position of a point is +0.5m. then when does it pass y=0 and what is the velocity at that time
  2. physics

    how to solve for velocity using these values... distance time(s) 28.5 (initial) 4.26 (initial) 89 (final) 6.77 (final)
  3. physical

    At what angle is an object launched if its initial vertical speed is 3.75 m/s and its initial horizontal speed is 4.50 m/s?
  4. Physics

    At what angle is an object launched if its initial vertical speed is 3.75 m/s and its initial horizontal speed is 4.50 m/s?
  5. physics

    A ball is projected horizontally from the edge of a table that is 1.15 m high, and it strikes the floor at a point 1.70 m from the base of the table. (a) What is the initial speed of the ball? m/s (b) How high is the ball above the floor when its velocity
  6. physics

    A ball is projected horizontally from the edge of a table that is 1.15 m high, and it strikes the floor at a point 1.70 m from the base of the table. (a) What is the initial speed of the ball? m/s (b) How high is the ball above the floor when its velocity
  7. Chemistry

    (A). A reaction with a known q is performed in a bomb calorimeter and is found that 10.0 kj of heat is required to raise the temperature of the calorimeter by 2.15 degrees C. calculate the heat capacity of the calorimeter. (B). When 1.00 g of C2H6(g) is
  8. chemistry

    1) Calculate the specific heat capacity (J/g oC) of iron, if a 803 g sample lost 937.4 J of heat energy in going from an initial temperature of 5.50 oC to a final temperature of 2.90 oC. 2)Calculate the final temperature (oC) of a 243 g sample of water
  9. chemisrty

    can anybody explain why and how a copper based catalyst helps in methonal production and the impact it would have on mass production many thanks A catalyst lowers the activitation energy needed for a reaction and allows reactants to produce more products
  10. chemistry

    Hydrogen gas can produced by the reaction between metallic aluminum and aqueous hydrochloric acid 2Al+6HCl----2AlCl3+3H2 Hydrogen gas produced by this reaction is typically collected via water displacement, during which time the hydrogen gas becomes
  11. Chem

    When 3.00 g of butane, C4H10, are combusted in a calorimeter containing 800. g of water, the temperature of the water changes by 44.4 °C. What is the heat of combustion of butane in kilojoules per mole? The molar mass of butane is 58.123 g/mol. The
  12. chemistry

    You react 25.0 liters of oxygen gas at STP with 50.0 ml of ethanol liquid. Ethanol has a density of 0.789 g/ml. After actually running the reaction you determined the percent yield was only 78.5%. How many LITERS of CO2 did you make? (Must put CO2 in
  13. Chemistry

    Which salt would result from the acid-base reaction of phosphoric acid and potassium hydroxide? I already know I will have to write and equation and it with make water (H2O) and a salt. I think it starts like this... H3Po4 + KOH = K2HPO4 + H2O But I'm not
  14. Chemistry

    Heat of Combustion of paraffin wax Initial mass of candle 40.3g Mass of tin calorimeter 41.1g Mass of half-filled calorimeter with water 220.4g Initial temp of water 18.8°C Final temp of water 26.6°C Final mass of candle 38.2g Calculate heat of
  15. PLZZZ HELP

    Heat of Combustion of paraffin wax Initial mass of candle 40.3g Mass of tin calorimeter 41.1g Mass of half-filled calorimeter with water 220.4g Initial temp of water 18.8°C Final temp of water 26.6°C Final mass of candle 38.2g Calculate heat of
  16. chem

    Zn^2+(aq) + 2OH^-(aq) ----> Zn(OH)2(s) a) how the addition of HCl affects the equilibrium? my answer is it will shift to the right b) how the addition of a small amount of NaOh affects the equilibrium?my answer is it will shift to the left c) how the
  17. Chem, Oxidation

    Complete and balance the following half-reactions. In each case indicate whether the half-reaction is an oxidation or reduction. (Use the lowest possible coefficients. Include states-of-matter under SATP conditions in your answer.) OH ‾(aq) ¨
  18. Physics

    Two balls have masses 44 kg and 86 kg. The 44 kg ball has an initial velocity of 80 m/s (to the right) along a line joining the two balls and the 86 kg ball is at rest. The 86 kg ball has initial velocity of −24 m/s. The two balls make a head-on
  19. Physics

    An 8.0g bullet is fired into a 2.5 Kg block at rest at the edge of a friction-less table of height 1.0 m. The bullet remains in the block and after the impact the block lands (d) distance from the bottom of the table. Find the initial speed of the bullet.
  20. physics

    A(n) 5 g bullet is fired into a 249 g block that is initially at rest at the edge of a frictionless table of height 1.7 m. The bullet remains in the block, and after impact the block lands 1.6 m from the bottom of the table. The acceleration of
  21. physics

    A(n) 5 g bullet is fired into a 249 g block that is initially at rest at the edge of a frictionless table of height 1.7 m. The bullet remains in the block, and after impact the block lands 1.6 m from the bottom of the table. The acceleration of
  22. physical science

    How many kilojoules are required to melt 5 lbs of gold if its initial temperature is 1000 K?
  23. chemistry

    Carbon Dioxide reacts with water in blood plasma to form carbonic acid.Suppose that you are a molecule of carbon dioxide. Describe the chemical reactions that take place when you enter the blood and when you leave the blood. Explain what determines how
  24. chemistry

    I am a bit confused with this proble because the concentration of SO3 at equilibrium. Any help would be appreciated. Given the reaction: SO2(g) + NO2(g) ⇌ NO(g) + SO3(g) ∆H = -42.6 kJ. How will the concentration of SO3(g) at equilibrium be
  25. Chem. reply+asap!

    In some industrial processes, sodium chromate is added to water coolants. When the coolant is drained, the chromate ions can be removed through an electrolysis process that uses an iron anode. The products of the electrolysis are aqueous iron(II) ions and
  26. chemistry

    When 10.0 mL of 0.012 M pb(NO3)2 is mixed with 10.0 mL of 0.030 M KI, a yellow precipitate of PbI2(s) forms. a)Calculate the molarity of [Pb^2+] b)Calculate the initial molarity of [I^-] c)On measuring the equilibrium concentrations of [I^-] it came out to
  27. physics

    On a cold day, you take a breath, inhaling 0.50 L of air whose initial temperature is −10°C. In your lungs, its temperature is raised to 37°C. Assume that the pressure is 101 kPa and that the air may be treated as an ideal gas. What is the total change
  28. Chemistry

    When 3.926g of NaOH is added to 100.0mL of water, the temperature of the solution increases by 28 degrees Celsius. Assume the density of the solution to be 1g/mL and specific heat capacity of the solution to be 4.184 J/gK. I'm unsure of which formula to
  29. Chemistry

    1. Which of the following is one way to prevent the corrosion of iron? A. Paint exposed iron parts with protective paint. B. Protect the iron from polluted air. C. Add carbon to the iron. D. Let the iron develop a natural coat of carbonate. 2. The source
  30. chemistry

    Find the temperature at which the reaction below is spontaneous given this data: Hfo of NH3(g) = - 46 kJ/mol, So of NH3(g) = 192.5 J/mol·K, So of N2(g) = 191.5 J/mol·K, So of H2(g) = 130.6 J/mol·K. N2(g) + 3H2(g) ßà 2NH3(g)
  31. Physics

    In deep space, a 636 kg space probe, travels with an initial velocity of 19 m/s. Retro-rockets fire, producing a 212 N force in the opposite direction of the probe's initial velocity. How many seconds until the probe has a velocity of 22 m/s in the
  32. Physics

    In deep space, a 636 kg space probe, travels with an initial velocity of 19 m/s. Retro-rockets fire, producing a 212 N force in the opposite direction of the probe's initial velocity. How many seconds until the probe has a velocity of 22 m/s in the
  33. Science - Please Look!

    The senses are used to make which of the following? inferences predictions evaluations ((**observations**)) You walk into the kitchen and see a broken egg on the floor. Which of the following is an inference you can make based on this observation? ((**The
  34. engineering

    In the process of electrolysis, electrical power is used to separate water into oxygen and hydrogen molecules via the reaction: H2O --> H2 + ½O2 This is very much like running a hydrogen fuel cell in reverse. We assume that only the activation
  35. physics

    In the process of electrolysis, electrical power is used to separate water into oxygen and hydrogen molecules via the reaction: H2O --> H2 + ½O2 This is very much like running a hydrogen fuel cell in reverse. We assume that only the activation
  36. physics

    a ball is projected at an angle with an initial velocity of 8m/s and an initial vertical velocity of 29.4m/s. Show trajectory diagram. Determine: a) displacement b)height at peak c)final speed
  37. Physics

    A basketball is shot from an initial height of 2.4 m with an initial speed (v0 = 12 m/s) directed at an angle (35 degrees) above the horizontal. Additional information: Height of the basket is 3.05 m Find how far away the player is standing.
  38. Thermodynamics

    5 pounds of an ideal gas with R=38.7 and K=1.668 have 300Btu of heat added during a reversible constant pressure change of state, initial temperature=80°F. Determine: a.)the final temperature b.)change of internal energy change of enthalpy change of
  39. Chemistry Dr Bob

    A voltaic cell has one half-cell with a Cu bar in a 1.00 M Cu2+ salt and the other half-cell with a Cd bar in the same volume of a 1.00 M Cd2+ salt. Report your answers to the correct number of significant figures. a)Find E degree cell, delta G degree ,
  40. Chemistry Dr BOB

    A voltaic cell has one half-cell with a Cu bar in a 1.00 M Cu2+ salt and the other half-cell with a Cd bar in the same volume of a 1.00 M Cd2+ salt. Report your answers to the correct number of significant figures. a)Find E degree cell, delta G degree ,
  41. math

    Consider the initial value problem, f(x,y) = y(18.06 - y), y(0) = 12. The exact solution of the problem increases from y(0) =12 to y = 18.06 as x increases without limit. Determine the minimum upper bound of h for the classical 4th-order Runge Kutta method
  42. Physics

    A ball is thrown upward from the ground with an initial speed of 25 m/s; at the same instant, a ball dropped from rest from a building 15 m high. After how long will the balls be at the same height? The equations I have is final velocity squared = initial
  43. complete and balnces theses reactions

    how do i complete and balnces theses reactions???? CH3-CH2-CH3 (g) + Br2 (l) --> like how in the world????? do i do this? lol aint got a clue wish i would have listened at school now. Alkanes usually react with a halogen to form one of several halides.
  44. chemisrty

    A 50.0 mL solution of 1.2 M HCl at 24.1C is mixed with 50.0 mL of 1.3 M NaOH, also at 24.1C, in a coffee-cup calorimeter. After the reaction occurs, the temperature of the resulting mixture is 29.8C. The density of the final solution is 1.05 g/mL.
  45. Chem

    Separate the following balanced chemical equation into its total ionic equation. AgNO3​(aq)+NaCl(aq) --> NaNO3​(aq)+AgCl(s) (List the ions in order of the above equation.) Write the net ionic equation for the reaction above. (Make sure the cation is
  46. chemistry

    Find the temperature at which the reaction below is spontaneous given this data: Hf^o of NH3(g) = - 46 kJ/mol, S^o of NH3(g) = 192.5 J/mol·K, S^o of N2(g) = 191.5 J/mol·K, S^o of H2(g) = 130.6 J/mol·K. N2(g) + 3H2(g) <-----> 2NH3(g)
  47. chemistry

    15. How much heat energy (in kJ) is evolved by a reaction in a bomb calorimeter in which the temperature of the bomb and water increased from 19.5 to 22.83 ºC? The bomb has a heat capacity of 650 J/C; the calorimeter contains 320 g of water.
  48. Chemistry

    A 2.50 gram sample of bronze was dissolved in sulfuric acid. The copper in the sample reacted with sulfuric acid to form copper sulfate. Cu (s) +2 H2SO4 (aq) -> CuSO4 (aq) +2 H2O (l) The copper sulfate formed in this reaction was mixed with I to form
  49. Chem

    when 21.70 ml of 0.5000 m h2so4 is added to 21.70 mL of 1.000 M KOH in a coffee cup calorimeter at 23.50 degrees c, the temperature rises to 30.17 degree c. calculate delta H of this reaction (Assume that the total volume is the sum of the individual
  50. Chemistry

    The decompostion of dinitrogen pentoxide has been studied in carbon tetrachloride (CCl4) at a certain temperature: 2N2O5→4NO2+O2 [N2O5] Inital rate (M/s) 0.92 ...... 0.95x10^-5 1.23 ...... 1.20x10^-5 1.79 ...... 1.93x10^-5 2.00 ...... 2.10x10^-5 2.21
  51. science

    First, you will investigate purely vertical motion. The kinematics equation for vertical motion (ignoring air resistance) is given by y(t)=y0+v0t−(1/2)gt2, where y0=0 is the initial position (which is 1.2 m above the ground due to the wheels of the
  52. Math

    Using h(t)=gt^2+v0t+h0, where g= -16, h0= initial height, v0= initial velocity, and t= time A rocket is fired into the air from the top of a building that is 200 feet tall. The initial velocity of the rocket is 600 feet/sec. If necessary, round answers to
  53. chemistry DR BOB

    A voltaic cell has one half-cell with a Cu bar in a 1.00 M Cu2+ salt and the other half-cell with a Cd bar in the same volume of a 1.00 M Cd2+ salt. Report your answers to the correct number of significant figures. a)Find E degree cell, delta G degree ,
  54. environmental chemistry

    PHcatalyzed reaction, NH3 + HOCl --> NH2Cl + H20 , how do I plot log k_obs vs pH? NH4 + HOCl --> NH2Cl + H20 rate expression : d(NH2Cl) / dt = k_obs (C_T,N)(C_T,OCL) assume (C_T,N) and (C_T,OCL) concentrations are constant pKa for NH4+ = 9.3 pKa for
  55. CHEM

    1. How many moles of water can be made from 4 moles of oxygen gas and 16 moles of hydrogen gas? What is the limiting reagent? 2. Calculate the mass of water produced from the reaction of 24.0 g of H2 and 160.0 g of O2. What is the limiting reagent? 3. The
  56. Chemistry

    Thanks for the help earlier My question Silicon tetrachloride (SiCl4) can be prepared by heating Si in chlorine gas: Si + 2Cl2 yields SiCl4 In one reaction 0.507 mole of SiCl4 is produced. How many moles of molecular chlorine were used in the reaction? Ok
  57. Chemistry

    A 300 Calorie donut is used to heat 5.0 kg of water. If the initial temperature of the water is 20 degrees C what will the final temperature of the water be? Assume no heat loss to the surroundings
  58. Chemistry II

    C4H4 (g) + 2 H2 (g) --> C4H8 (g) Combustion reactions involve reacting a substance with oxygen. When compounds containing carbon and hydrogen are combusted, carbon dioxide and water are the products. Using the enthalpies of combustion for C4H4 (-2341
  59. chemistry

    A galvanic cell with e o cell = 0.30 v can be constructed using an iron electrode in a 1.0 m fe(no3)2 solution, and either a tin electrode in a 1.0 m sn(no3)2 solution, or a chromium electrode in a 1.0 m cr(no3)3 solution even though sn2+/sn and cr3+/cr
  60. Chemistry

    A- a water soluble salt forms a precipitant during Group 3 analysis. An acidic solution of this precipitant and NaBiO3 yields a pinkish color. This same salt has no reaction to concentrated H2SO4 or AgNO3, what is the chemical formula for this salt? B- a
  61. Chemistry

    A- a water soluble salt forms a precipitant during Group 3 analysis. An acidic solution of this precipitant and NaBiO3 yields a pinkish color. This same salt has no reaction to concentrated H2SO4 or AgNO3, what is the chemical formula for this salt? B- a
  62. chemistry 30

    Calculate the enthalpy of reaction for the combustion of ethene.
  63. chemistry

    is the fizz from soda pop a chemical reaction?
  64. chemistry

    How much heat (in kilocalories) is released when 7.87g of Al is used in the reaction?
  65. chemistry

    WHAT TYPE OF CHEMICAL REACTION IS FORMED FROM Mg + O2----MgO
  66. Chemistry

    Provide the products for this reaction: CH3O- +CH3SH -> ????
  67. science

    2Zn+O2=2ZnO. What type of chemical reaction is it
  68. Chemistry

    give the reaction when lead nitrate is heated
  69. chemistry

    If you have 64.3 g NH3, how many grams of F2 are required for complete reaction?
  70. Chemistry

    Calculate delta g and Kp for the following equilibrium reaction. Keep getting 7.2E-81 and the answer is 4.5E-81 Why?
  71. Chemistry

    What is the equation for the reaction between stearic acid and ammonia?
  72. chem

    evaluate E^0 for the half reaction: CO2 (g) + 2H + 2e^- <--> HCOOH ( Aq)
  73. Chemistry

    What is the rate law of the reaction 2NO2 gives N2O4?
  74. CHEM - ASAPPP

    write the equation for the reaction of fecl2 with k3[fe(cn)6]???
  75. chem - asap

    write the equation for the reaction of fecl2 with k3[fe(cn)6]???
  76. chem - asap

    write the equation for the reaction of fecl2 with k3[fe(cn)6]???
  77. chemistry

    write the reaction for the dehydration of CuSO4 . XH20?
  78. Chemistry

    explain why glucose 1,6 bisphosphate would not be able to go through the aldolase reaction.
  79. Science

    The half-reaction of 3 Pb + 2 NO3 + 8 H-->3 Pb2+ + 2 NO + 4H2O
  80. Science: Chemistry

    Indentify the products of the following reaction: Al + NaOH -> ?
  81. chemistry

    Write a balanced reaction for the formation of Fe2O3 (s)?????
  82. Chemistry

    What is the equation for the reaction of potassium soap with HCL?
  83. Chemistry

    What is the ionic equation for hydrolysis reaction of NH4C2H2O2 ? Thanks.
  84. Science

    What is the combustion reaction for Isopropyl Alcohol (C3H8O)?
  85. Chemistry

    Hess'slaw can be applied to calculate the reaction is?
  86. chemistry

    If a reaction mixture contains 28 of , 150 of , and 36 of , what is the limiting reactant?
  87. Chemistry

    OH- + C6H5CH2COOH H2O + C6H5CH2COO- What is the K for the reaction above in terms of Ka's, Kb's, Kw etc.?
  88. Chemistry

    How much heat is produced by the complete reaction of 5.29 kg of nitromethane?
  89. Chemistry

    How many grams of Ni(OH)2 are produced from the reaction of 30.0 mL of 1.75 M NaOH solution?
  90. science

    the spectator ions of all substance that are soluble of the reaction
  91. chemistry

    What are the products of a reaction between NaCl, HNO3, and AgNO3?
  92. Chemistry

    If ions O^2- are added to water, what reaction, if any, occurs?
  93. Chem

    What is the oxidation half-reaction for Mg(s)+ZnCL2(aq)>MgCL2(aq)+Zn(s)?
  94. Chemistry

    Calculate G° for each reaction using G°f values. MnO2(s) + 2 CO(g) Mn(s) + 2 CO2(g)
  95. Chemistry

    how do you write the reduction half-reaction of ions?
  96. Science

    how is energy produced during a nuclear fusion reaction?
  97. Chem 1411

    Predict the product in the combination reaction below. Al(s) + N2(g)
  98. CHEM

    Calculate G° for each reaction using G°f values. MnO2(s) + 2 CO(g) Mn(s) + 2 CO2(g)
  99. science

    Torque due to action-reaction force is zero?
  100. Chemistry

    A reaction of hydrolysis of Ba(NO) in a net ionic form?