1. Chemistry!!

    how would i do this problem?? Given this equation: 2SO2(g) + O2(g) ---> 2SO3(g) If 50.0 grams of S02 react, what is delta H for the reaction?? how would i do that??
  2. Chemistry

    At 319K the decomposition of dinitrogen tetroxide occurs with the following Kp: 2NO2(g)<>2NO(g)+O2(g) Kp=.700 What is the value of Kc for this reaction?
  3. sicence

    since action and reaction are exactly equal and oppositely directed,how is it possible for a net force to be acting on a body?
  4. Science

    For the reaction 2zn+o2=2zno, how many grams of zinc oxide are produced from 2.25g of oxygen?
  5. Science

    Given the following balanced equation, determine the rate of reaction with respect to [O2]. 2 SO2(g) + O2(g) → 2 SO3(g)
  6. 8th grade science

    compare and contrast the effect of a catalyst on a chemical reaction with that of an inhibitor?
  7. chemistry

    Write net ionic equation for the reaction between nitric acid and calcium hydroxide.
  8. science

    I have to draw Atomic Model Drawings of the Reaction to H2CO3 and then show a balance check. How do I do that?
  9. chemistry

    Write the anodic reaction for the electrolysis of zinc chloride solution using platinum electrode
  10. chem

    how would I do the elimination reaction of 2-chloropentane. When I figured it out I got the products as being 1-pentene and hydrogen chloride. Is this correct?
  11. chemistry!

    How many grams of NH3 can be produced from the reaction of 17.8 moles of H2 and a sufficient supply of N2? N2 + 3H2 ---> 2NH3
  12. Chemistry

    a solution of 25 ml of HCL is neutralized by 42.5 ml of 0.10 M concentration of NaOH.Need to write a balanced equation for the reaction
  13. chem

    can u help me write a word equation for the electrolysis of water , and indicate physical states and conditions of the reaction
  14. Newtons Cooling Method

    Instructions Assume that goat milk butter melts at {85.25}^{\circ} F. On a summer day you take a stick of butter out of the refrigerator, which is set to {36.5}^{\circ} F, and put it on your front porch where the temperature is {89.5}^\circ F. (a) By
  15. Chemistry

    The standard solution of FeSCN2+ (prepared by combining 9.00 mL of 0.200 M Fe(NO3)3 w/1.00 mL of 0.0020 M KSCN) has an absorbance of 0.530. If a trial's absorbance is measured to be 0.150 and its initial concentration of SCN– was 0.00070 M, the
  16. s103

    Reaction 1 O ll CH2=CH-CH-OH + CH3-CH-CH2-C l l l CH3 CH3 OH compound 1 compound 2 Products? identify any functional groups in compounds 1&2, circle them and name them clearly? complete the equation for reation 1 by drawing the abbreviated structural
  17. Pre-Ap Physics

    During World War I, the Germans had a gun called Big Bertha that was used to shell Paris. The shell had an initial speed of 2.65 km/s at an initial inclination of 41.9◦ to the horizontal. The acceleration of gravity is 9.8 m/s 2 . How far away did
  18. AP chem!!!

    Iron ore consists mainly of iron III oxide. When iron III oxide is heated with an excess of coke(carbon), iron metal and carbon monoxide are produced. Assume that even if an excess of coke is not present that the reaction proceeds as described. A)write a
  19. chem expirement!

    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
  20. Chemistry (How do I calculate)

    Calculate the Molar Enthalpy of Neutralization (ΔHn) in kJ/mol of the reaction between a monoprotic acid and a monoprotic base, given the following information: The temperature change equals 6.92°C, 50.0 mL of 1.00 M concentration of Acid 50.0 mL of
  21. Calculus

    The police department must determine a safe speed limit on a bridge so that the flow rate of cars is at a maximum per unit time. The greater the speed limit, the farther apart the cars must be expected to be in order to allow for a safe stopping distance.
  22. math-urgent please help

    Newton’s Law of Cooling states that the temperature of a heated object decreases exponentially over time toward the temperature of the surrounding medium. The temperature u of a heated object at a given time t can be modeled by the following function:
  23. Physics

    A lead ball, with an initial temperature of 25.0oC, is released from a height of 96.0 m. It does not bounce when it hits a hard surface. Assume all the energy of the fall goes into heating the lead. Find the temperature (in degrees C) of the ball after it
  24. chemistry

    i am working on a practice worksheet and need help with a few i can not understand. please and thank you. I have to post them separately sorry 49.how many grams of water are needed to completely hydrolyze 30.8 g of the ester? A.0.416 g B.30.8 g C.11.3 g
  25. psychology

    The following table describes five situations in which a person reacts to stress in an unhealthy manner. For each: a. identify the stressor(s). b. briefly explain why the person's reaction is an unhealthy choice. c. briefly describe one healthy alternative
  26. Chemistry(Please help, thank you!!!)

    Write the balanced, complete, and net ionic equations for each precipitation reaction. 1) AgNO_3 + CoCl_2 ---> BE: AgNO_3(aq) + CoCl_2(aq) ---> AgCl_2 (aq) + Co(NO_3)(aq) CIE: Since the balanced equation is all (aq) there is no reaction so no
  27. Physics

    A fast, measured pitched baseball left the pitcher's hand at a speed of 48.6 m/s. The pitcher was in contact with the ball over a distance of 1.44 m and produced constant acceleration. I know that t=(Vf-Vi)/a based on a kinematic equation. Also, I setup:
  28. chemistry

    A student generates H2(g) over water using the reaction between zinc and hydrochloric acid Zn(s)+ 2HCl(aq)---> ZnCl2(aq)+ H2(g) Data: Mass of vial and zinc 15.5082 mass of vial 15.3972 mass of zinc 0.111 final burette reading 45.30mL barometric
  29. chemistry

    When magnesium metal and an aqueous solution of hydrochloric acid combine, they produce an aqueous solution of magnesium chloride and hydrogen gas. Using the equation, Mg (s) + 2HCl (aq) Imported Asset MgCl2 (aq) + H2 (g), if 72.9 g of Mg and 146.0 g of
  30. chemistry

    When magnesium metal and an aqueous solution of hydrochloric acid combine, they produce an aqueous solution of magnesium chloride and hydrogen gas. Using the equation, Mg (s) + 2HCl (aq) Imported Asset MgCl2 (aq) + H2 (g), if 72.9 g of Mg and 146.0 g of
  31. Chemistry

    The reaction between bromine gas and fluorine gas to create bromine monofluoride gas has reached equilibrium. What is the effect of adding more bromine gas to the reaction chamber? More fluorine gas will be produced. More bromine gas will be produced. More
  32. Chemistry

    A piece of solid magnesium is reacted with hydrochloric acid to form hydrogen gas: Mg (s) + 2HCl (aq) ---> MgCl2 (aq) + H2 (g) What volume of hydrogen gas (in mL) is collected over water at 25 degrees Celsius by reaction of 0.450 g of Mg (AW= 24.3
  33. Chem

    You have 25.00 mL of 3% by mass solution of hydrogen peroxide. Assume the density of this solution is 1.00 g/mL. If all of the hydrogen peroxide decomposes to water and oxygen according to the reaction below: 2H2O2 (aq) <--> 2H2O (l) + O2 (g) What is
  34. Physics- HELP

    How to find average speed with a given initial speed, theta, and delta x? I know average speed= total distance/total time, but I am given an initial speed, an angle and delta x. Mark throws a ball to Daniel with an initial speed of 20 m/s at an angle of 45
  35. English

    I would like to know if this grammatically correct. When there is change in reactant, product, and temperature the equilibrium position will shift in a direction that tends to decrease that change in situations. When the concentration of one of the
  36. Physics

    A 1.8 kg piece of a metal initially at a temperature of 180oC is dropped into the water with mass of 14 kg. The water is in a container made of the same metal with mass 3.6 kg. The initial temperature of the water and container is 16.0oC, and the final
  37. Physics

    7 g bullet is fired into a 124 g block that is initially at rest at the edge of a frictionless table of height 1.3 m. The bullet remains in the block, and after impact the block lands 2.2 m from the bottom of the table. Find the initial speed of the
  38. 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
  39. Chemistry DrBob

    I don't understand how you get the answer. I really don't understand any of this, how do I set it up with the numbers? once i get how to do this, then i feel i will understand how to set these up from here on out. so if you could, show all your work,
  40. Science

    A 2 kg mass is hanging from a spring with a constant of 1500 N/m. The mass is pulled down a distance of 0.3 m and then released. If the specific heat capacity of the spring is 0.35 J/gK, the spring has a mass of 10 g and the initial temperature of the
  41. Chemistry

    Consider the cracking of gaseous ammonia at constant total pressure of 1 atm and constant temperature. Find the equilibrium gas composition at 400 degree C. Given: The Gibbs free energy for the cracking reaction 2NH3 = N2 + 3H2, DeltaGo ( delta G standard)
  42. Physics

    An object is shot at 20m/s at an angle theta. The object lands 24m away. What is the angle? Can you check if I am doing this right? I had v(initial) = 20 m/s g = 9.8 m/s^2 x = 24m 1st I solved for time: x = v(initial) t x = v(initial) cos(theta) t 24 = 20
  43. Chemistry

    I've figured out the Ea but I'm not sure how to find the kcal/mol The gas reaction N2O5 → 2NO2 + 1/2O2 follows the Arrhenius equation k = Ae(-Ea/RT) where R = 8.314 J K-1 mol-1 and 1 calorie = 4.184J. At the temperature T=273K, k = 3.46 x 10-5 s-1,
  44. chemistry

    when 50.0 ml of 2.00M KOH is reached with 50.0 ml of 2.00M HCl, the temperature rose from 20.0 degree celcus to 28.7 degree celcus. What is the heat generated by this neutralization? (Assume that the density fo the two 2 M solution is 2.00g/ml and that the
  45. molecular biology

    To confirm that the recombinant plasmids obtained were exactly what you wanted, you need to determine the DNA sequence of the PCR products found in several of the recombinant plasmids. To do this, you use the primer 5'-CACG-3'. You carry out a set of four
  46. Chemistry

    I don't really understand these questions and their processes. And I am a bit iffy on redox reactions. For problem 3, can you show a step by step process how to do the problem? Problem 2, I do not fully understand how to do it at all. How would you know
  47. Chemistry(Please check answers)

    1) The standard molar entropy value of N2 (g) is 191.5 J/K-mol, of O2 (g) is 205.0 J/K-mol and of NO2 (g) is 240.0 J/K-mol. From these values we can calculate the Delta So for the reaction N2 (g) + 2 O2 (g)-> 2 NO2 (g) to be? I did products - reactants
  48. physics

    Jordan tosses a ball upwards with an initial velocity of 14.0 m/s. What is the displacement in meters of the ball during the first 2.5 seconds after she threw it? (don't include units in the answer, use 10.0 m/s2 for g and use the upward direction as
  49. Chemistry

    Automobile air bags employ a chemical reaction involving the rapid decomposition of sodium azide (NaN3) into sodium metal and nitrogen gas to inflate in a collision. How much sodium azide is required to decompose to inflate a 20.0 L air bag? Assume that
  50. math

    Suppose that a ball has a rebound percentage of 75 and the ball is dropped from a height of 5ft onto the concrete below. Make a table of the data. Write a recursive rule for the data. Write a closed-form function rule for the data. What would the height of
  51. AP Chem

    Whew. long question. Barium carbonate is the source of barium compounds. It is produced in an aqueous precipitation reaction from barium sulfide and sodium carbonate. (Barium sulfide is a soluble compound obtained by heating the mineral barite, which is
  52. Chemistry

    For there reaction system involving the species in the table below, what conclusion is justified for standard state conditions? Standard Reduction Potentials E0 2Fe3+ + Sn2+ ¡ú 2Fe2+ + Sn4+ +0.62 V Sn2+ + I2 ¡ú Sn4+ + 2I¨C +0.38 V (A) I¨C would react
  53. Physics- i need to know how to do these problems

    Two projectiles are launched from the ground, and both reach the same vertical height. However, projectile B travels twice the horizontal distance as projectile A before hitting the ground. a. How large is the vertical component of the initial velocity of
  54. Chemistry

    Use the data in the table to determine how long it will take for half of the original amount of SO2Cl2 to decompose at the average reaction rate. Experimental Data for SO2Cl2(g) → SO2(g) + Cl2(g) Time (min) [SO2Cl2](M) [SO2](M) [Cl2](M) 0.0 1.00 0.00
  55. Physics

    A gas is kept at a pressure of 4.00 × 105 Pa and a temperature of 30.0 °C. When the pressure is reduced to 3.00 × 105 Pa and the temperature raised to 40.0 °C, the volume is measured to be 0.45 × 10^−4 m^3. Estimate the original volume of the gas. I
  56. chemistry

    In the following experiment, a coffee-cup calorimeter containing 100 mL of H2O is used. The initial temperature of the calorimeter is 23 degrees Celsius. If 4.00 g of CaCl2 is added to the calorimeter, what will be the final temperature of the solution in
  57. Chemistry

    When solutions of two reactants were mixed in a coffee-cup calorimeter, the following temperatures were recorded as a function of time. Plot the data on one of the available pieces of graph paper. Obtain tf, the final temperature, by extrapolating to the
  58. chem

    A sample of gas in a balloon has an initial temperature of 19 ∘ C and a volume of 1.47×103L . If the temperature changes to 63 ∘ C , and there is no change of pressure or amount of gas, what is the new volume, V 2 , of the gas?
  59. chemistry

    A sample of gas in a balloon has an initial temperature of 9.0∘C and a volume of 1.75×103L . If the temperature changes to 80.∘C , and there is no change of pressure or amount of gas, what is the new volume, V2, of the gas?
  60. Chemistry

    In the following experiment, a coffee-cup calorimeter containing 100 \rm mL of \rm H_2O is used. The initial temperature of the calorimeter is 23.0 \rm ^{\circ}C. If 9.80 g of \rm CaCl_2 is added to the calorimeter, what will be the final temperature of
  61. Chem answer check

    Does this look correct? Thx! Write the balanced equation for the reaction between solid copper and silver nitrate, that produces solid silver and copper(II) nitrate in solution. Include your experimentally determined mole ratios for the copper and silver
  62. Chemistry

    This is a three part problem I need help in figuring out pleaseI n each of the questions below you are going to determine a different type of balanced equation for the same reaction. Make sure your equations have the lowest whole number coefficients
  63. Chemistry

    This is a three part problem I need help in figuring out pleaseI n each of the questions below you are going to determine a different type of balanced equation for the same reaction. Make sure your equations have the lowest whole number coefficients
  64. Chemistry-DrBob222

    A piece of solid magnesium is reacted with hydrochloric acid to form hydrogen gas: Mg (s) + 2HCl (aq) ---> MgCl2 (aq) + H2 (g) What volume of hydrogen gas (in mL) is collected over water at 25 degrees Celsius by reaction of 0.450 g of Mg (AW= 24.3
  65. Chemistry

    Nitrogen and hydrogen combine at high temperature, in the presence of a catalyst, to produce ammonia. N2(g)+3H2(g)-->2NH3(g) Assume 4 molecules of nitrogen and 9 molecules of hydrogen are present. After complete reaction, how many molecules of ammonia
  66. Algebra

    A construction worker drops a hammer from a height of 25 m. How long will it take the hammer to hit the ground? Use the formula h(t)=−4.9t62+vot+ho , where vo is the initial velocity and ho is the initial height. Round to the nearest tenth of a second.
  67. math

    When a ball is thrown up into the air, it makes the shape of a parabola. The equation S= -16t^2 + v*t + k gives the height of the ball at any time, t in seconds, where “v” is the initial velocity (speed) in ft/sec and “k” is the initial height in
  68. physics

    A quarterback throws the football to a stationary receiver who is 22.7 m down the field.The football is thrown at an initial angle of 39◦ to the ground. The acceleration of gravity is 9.81 m/s2 . a) At what initial speed must the quarter- back throw
  69. math

    When a ball is thrown up into the air, it makes the shape of a parabola. The equation S= -16t^2 + v*t + k gives the height of the ball at any time, t in seconds, where “v” is the initial velocity (speed) in ft/sec and “k” is the initial height in
  70. physics

    A projectile is fired and lands t = 14 s later on the side of a hill, at a location 1400 m away horizontally and 420 m above its starting point. Find the projectile's initial horizontal velocity vx0 and initial vertical velocity vy0. Assume g = 10 m/s2.
  71. college algebra

    When a ball is thrown up into the air, it makes the shape of a parabola. The equation S= -5t^2 + v*t + k gives the height of the ball at any time, t in seconds, where “v” is the initial velocity (speed) in ft/sec and “k” is the initial height in
  72. Biostatstics

    Question: The New York State Health Department reports a 10% rate of the HIV virus for the “at-risk” population. Under certain conditions, a preliminary screening test for the HIV virus is correct 95% of the time. (Subjects are not told that they are
  73. Chemistry

    The question is with a lab that I have already done. Here are my numbers moles of malachite in 1g 221.12 moles of CuO produced 141.57 ratio of moles of CuO produced per moles of malachite decomposed 79.55 Use the mole ratio of CuO produced per mole of
  74. physics

    Calculate the range of the projectile using the initial speed and angle. Use g = 9.8m/s your calculation. Initial speed is 18m/s Angle is 75 Help please !!
  75. physics

    A 29 g ice cube at 0.0°C is added to 110 g of water in a 62 g iron cup. The cup and the water have an initial temperature of 25°C. (a) Find the equilibrium temperature of the cup and its contents. i don't understand how the iron cup changes the
  76. Chemistry - General

    1. Consider a calorimeter into which 135g of water at 45.3 degrees Celsius is added. The initial temperature of the calorimeter was 23.8C and the equilibrium temperature of the water and the calorimeter is 39.6C. Assuming there is no heat loss to the
  77. chemistry

    In the following experiment, a coffee-cup calorimeter containing 100ml of H2O is used. The initial temperature of the calorimeter is 23 degrees celcius. If 7.20g of CaCl2 is added to the calorimeter, what will be the final temperature of the solution in
  78. Physics

    A 3kg block is attached to an ideal spring with a force constant k = 200N/m. The block is given an initial velocity in the positive direction of magnitude u = 12 m/s and no initial displacement (x o = 0). Find (10 marks) a. The amplitude and b. The phase
  79. Physics

    A 3kg block is attached to an ideal spring with a force constant k = 200N/m. The block is given an initial velocity in the positive direction of magnitude u = 12 m/s and no initial displacement (x o = 0). Find (10 marks) a. The amplitude and b. The phase
  80. math

    a group of fans at a football game are sitting in 7 rows with 28 in each row.in the center, a section of 14 fans in 3 rows and a section of 11 fans in 3 rows have cards spelling out the team name.how many fansdo not have a card?
  81. physics

    The data in the following table describe the initial and final positions of a moving car. The elapsed time for each of the three pairs of positions listed in the table is 0.52 s. Review the concept of average velocity in Section 2.2 and then determine the
  82. Chemistry

    Use the data in the table to calculate the Delta G0 of the following reaction at 298k: Al2O3 ---> Delta G fusion -1582.3 HCl----> -131.2 AlCl3 -----628.8 H2O --- -237.1 The equation is Al2O3 + 6HCl ---> 2 AlCl3 + 3H2O products - reactants?
  83. AE is this correct?

    determine the teachercertification/licensure requirements for the state you would like to teach in. I picked wisconsin and i put this...... Initial In-State Teaching or Pupil Services - PI-1602-IS Graduates of Wisconsin educator preparation programs only.
  84. chemistry

    what is the coefficients on Oxygen in the balanced equation for the following hydrocarbon combusion reaction C7H14 + O2 = CO2 + H2O
  85. Chemistry

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

    how many moles of silver nitrate are required to react with 24.8 mL of 1.15M calcium chloride in a metathesis reaction Thanks!
  87. Physical Science

    How do I write and balance this chemical equation as a double replacement reaction: K2SO4(aq) + PB(NO3)2 (aq)
  88. 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
  89. Science

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

    if the pressure was increased in this reaction : 2NO(g)+ O2 =====> 2NO2 <==== wouldnt the product side be favored? Please tell me if I'm right or wrong see above.
  91. chemistry

    How do you write a balanced equation for the preparation of phenylmagnesium bromide and it's reaction with benzophenone followed by neutralization in acid?
  92. Chemistry

    Calculate the cell potential for the following reaction as written at 25.00 °C, given that [Mg2 ] = 0.763 M and [Sn2 ] = 0.0180 M Mg(s)+Sn^2+(aq)-->Mg^(2+)+Sn(s) I keep getting 2.57 but it says I'm wrong. Please help me!
  93. 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?
  94. chm152

    Consider the equilibrium of water with gaseous hydrogen and oxygen: Give the value of for this reaction, if it is written as: Choose one answer. a. -7.8 x 10^-16 b. -3.9 x 10^-16 c. 1.3 x 10^-15 d. 6.4 x 10^-14 e. 3.6 x 10^2
  95. AP Chem

    A first-order reaction has a rate constant of 0.547 min - 1. How long will it take a reactant concentration 0.14 M to decrease to 0.07 M? Not sure how to do this!
  96. Gen Chem

    n = 6 and E° = 0.011v for a redox reaction with Q = 7.03 x 10-1. Calculate E. Assume T = 298.15K. How do I set this equation up?
  97. chemistry

    Phosphorus (p4) burns in the air to give diphophorus pentoxide. what is the blance chemical equation for the reaction
  98. Chemistry

    What is the ratio of rate constants at 305k and 300k if the activation energy of a reaction is 58.3kJ/mol
  99. Chemistry

    When the oxidation-reduction reaction shown here is balanced, how many electrons are transferred for each atom of copper that reacts? Ag^+ + Cu = Ag + Cu^2+
  100. chemistry

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