1. chemistry

    How much heat is gained (in Joules) by the water where a chemical reaction takes place in 100 mL aqueous solution and has a temperature increase of 14 C?
  2. chemistry

    How much heat (in kilocalories) is evolved or absorbed in the reaction of 1.60 g of Na with H2O? 2Na(s)+2H2O(l)→2NaOH(aq)+H2(g), ΔH = -88.0 kcal (-368 kJ)
  3. Chemistry

    I need help with Stoichiometry Mapping and solving using the "line bar" method Cl2P4(s)+6Cl2(g) --> 4PCl3(g) How many mL of PCl3 can be produced by the reaction of so g of Cl2(g)
  4. chemistry

    What would Qc be if the volume of the container decreased by a factor of 1.774 for the following reaction? PH3(g) + BCl3(g) → PH3BCl3(s) KC = 534.8 at 353.0oC
  5. Chemistry

    Calculate the cell potential for the following reaction as written at 25.00 °C, given that [Cr2 ] = 0.859 M and [Ni2 ] = 0.0190 M. Standard reduction potentials can be found here.
  6. chimestry

    150 ml of 0.4m nitric acid reacts with 100 ml 0.3m mg(oh)2. calculate the ph as poh of the solution after completion of the reaction. 2hno3+mg(oh)2-->mg(no3)2+2h2o
  7. Chemistry

    The standard enthalphies of formation of ozone, O3(g), and oxygen atoms are +142.70 and +249.17 kJ/mol. Calculate the reaction enthalpy for 2O2(g)-->O3(g)+O(g)
  8. chemistry

    Write a net ionic equation for the reaction that occurs when aqueous solutions of sodium hydroxide and perchloric acid are combined.
  9. Chem

    how many millimeters of 0.200M FeCL3 are needed to react with an excess of Na2S to produce 1.38g of Fe2S3 if the percent yield for the reaction is 65.0%
  10. physical science

    Help please. Aisha drops an antacid tablet in water and times how long it takes to dissolve. Which of the following will decrease the reaction rate?
  11. Chemistry

    3NO2(g) + H2O(l) → 2HNO3(aq) + NO(g) standard enthalpy: -133.5 Find the change in internal energy for this reaction. Enter in kJ.
  12. Chemistry

    how do I balance the following skeleton redox equation for a reaction occurring in acidic solution. HNO2 + MnO4- yield to Mn2+ + NO3-
  13. chem 1411

    what mass of H2 is produced by the reaction of 118.5 mL of a 0.8775M solution of H3PO4 according to the following equation: 2Cr+2H3PO4= 3H2+2CrPO4
  14. Chemistry

    SO2(g) + O2(g) → SO3(g) What volume of sulfur dioxide gas reacts with 15.0 L of O2? The reaction conditions are 875°C and 1.00 atm pressure
  15. ap chemistry

    We drop 50.5 grams of magnesium into 572 mL of a 3 M HCl solution. What is the maximum volume of dry hydrogen that could be produced by this reaction at STP?
  16. CHEM 1411

    What mass of Gallium chloride is formed by the reaction of 2.6 L of a 1.44 M solution of HCl according to the following equation: 2Ga+ 6HCl= 2GaCl3+3H2
  17. chem

    18.1g of ammonia and 90.4g of copper(II) oxide are used in the reaction 2NH3+3CuO=N2+3Cu+3H3O.What is the limiting reactant? How many grams of nitrogen will be formed?
  18. ap chemistry

    Consider the reaction Ni(s) + 4CO(g) ! Ni(CO)4(g) Assuming the gases are ideal, calculate the work done on the system at a constant pres- sure of 1 atm at 75C for the conversion of 1.00 mole of Ni to Ni(CO)4.
  19. Chemistry

    Calculate the cell potential for the following reaction as written at 25.00 °C, given that [Cr2 ] = 0.859 M and [Ni2 ] = 0.0190 M. Standard reduction potentials can be found here. Cr+Ni(2+) ->Cr(2+) + Ni
  20. children graowing up

    the final stage in an acute distress reaction prompted by separation is often ? a.dispair b.detachment c.resentment d.protest my answer is b
  21. chemistry

    Write a balanced equation for the proton transfer reaction between water and phosphate ion. Determine in which direction the equilibrium is favored.
  22. chem

    I don't understand ehat is the chemistry behind the ASA – FeCl3 reaction? what is this question even asking? any response will do so plz help (Broken Link Removed)
  23. Chemistry

    For the reaction HCl + NaOH → NaCl + H2O, how many moles of hydrochloric acid are required to produce 281.0 g of water?
  24. Chemistry

    What are the formulas of the salts that precipitate when the reaction mixture (n-butyl alcohol, sodium bromide, water, and sulfuric acid) is cooled?
  25. chemistry

    the activity series of metals is: Au < Ag < Cu < Sn < Cd < Zn < Al < Mg < Na < Cs which reaction below occutrs spontaneously upong mixing the reageant shown? a) Sn(s) + Al3+ (aq)-> sn2+(aq) + al(s) b) sn(s) + zn 2+ (aq) ->
  26. Chemistry

    Calculate the cell potential for the following reaction as written at 25.00 °C, given that [Cr2 ] = 0.859 M and [Ni2 ] = 0.0190 M. Standard reduction potentials can be found here.
  27. Chemistry

    Identify the atom that increases in oxidation number in the following redox reaction. 2MnO2 + 2K2CO3 + O2 2KMnO4 + 2CO2 *A.) Mn B.) O C.) K D.) C Please show work Thank you.
  28. Science

    Can anyone exlplain how particles behave in the reaction between iron and sulphur???!!! Ive checked all over google and cant find any helpful answers!!! PLZ HELP ME!!
  29. SCIENCE

    In a reaction 6.56g of Zinc reacted with excess dilute Hydrochloric acid Calculate the volume of hydrogen evolved at STP
  30. chem

    How many CO2 molecules would be formed from the reaction mixture that produces the greatest amount of products? 2CH3OH(g)+3O2(g)--->2CO2(g)+4H2O(g)
  31. chemistry

    Arrange the three metals in order of their relative strengths as reducing agents, placing the strongest first. Write each metal as a half reaction.
  32. Chemistry

    what mass of hydrogen must be reachted with excess nitrogen to produce 5000. J of energy based on the reaction: 3H2+N2--> 2NH4+2709J
  33. chemistry

    0.43g limestone and 98cm3 of carbon dioxide are produced on reaction with excess hydrochloric acid. How much calcium carbonate is present?
  34. chem

    How many CO2 molecules would be formed from the reaction mixture that produces the greatest amount of products? 2CH3OH(g)+3O2(g)--->2CO2(g)+4H2O(g)
  35. chemistry

    Consider the following reaction. CH4(g) + 2 O2(g) CO2(g) + 2 H2O(l) ÄH = -891 kJ Calculate the enthalpy change for each of the following cases. (a) 5.00 g methane is burned in excess oxygen.
  36. Chemistry 112

    Can someone please explain to me how to calculate reaction order with respect to something? I've read this in my textbook, and I watched videos on YouTube, but I still don't understand. Please help.
  37. chemistry

    When HgO is heated, it decomposes into elemental mercury and molecular oxygen gas. If 66.0 g of Hg is obtained from 82.0 g of the oxide, what is the percent yield of the reaction?
  38. Chemistry

    Write the net ionic equation for the reaction between sodium chloride and cobalt (ll) nitrate. so far i have... 2NaCl(aq)+ Co(NO3)2(aq)---> NaNO3(aq)+CoCl2(s)
  39. chemistry

    The value of ΔH° for the reaction below is -1107 kJ: 2Ba (s) + O2(g) → 2BaO (s) How many kJ of heat are released when 5.75 g of Ba (s) reacts completely with oxygen to form BaO (s)?
  40. Chemistry

    Write a balanced net ionic equation (include physical states) for the following reaction: HClO2(aq)+NaOH(aq)=H2O(l)+NaClO2(aq)
  41. Chemistry

    Write a balanced net ionic equation (include physical states) for the following reaction: Fe(NO3)3(aq) + LiOH(aq) → LiNO3(aq) + Fe(OH)3(s)
  42. Chemistry - Cell Potential

    Determine the delta G(o) and the equilibrium constant for the following reaction at 323 K. 2Br- + I2 --> Br2 + 2I- I got 100 kj/mol and K 7.19x10^16 but not sure if this is right
  43. organic chemistry

    what is the major and minor product of 3-methyl 1-pentene + propanol reacted with sulfuric acid?! Detailed mechanism reaction please?? Thank you!
  44. Chemistry

    How many grams of commercial C2H4O2 (97% pure by mass) must be allowed to react with an excess of PCl3 to produce 75.0g of C2H3OCL if the reaction has a 78.2% yield?
  45. Research Writing

    1. A blowout, or a flat tire that occurs ____ while you are driving, can be frightening. sudden suddenly -------------------------------------------------------------------------------- 2. Blowouts happen less ____ than they used to. frequently frequent
  46. CHEMISTRY

    Mass (before reaction): test tube + HCl(aq) + stir bar + capsule 26.600 g Mass (after reaction): test tube + HCl(aq) + stir bar + capsule 25.300 g Volume of water displaced from the squirt bottle 148 mL Temperature of the CO2(g) 287.4 K Pressure (atm)
  47. Honors Chemistry (stoichiometry)

    Can someone check and make sure I'm doing these problems right? Thanks so much!! 1. N2 + 3H2 ==> 2NH3 : How many moles of hydrogen are needed to completely react with two moles of nitrogen? ==> I got 6 moles. 3. Zn + 2HCl ==> ZnCl2 + H2 : How many
  48. chemisty help

    for the reaction shown, compute the theoretical yield of the product in grams for each of the following initial amounts of reactants. Ti + 2F2 to make TiF4 There are 3 sub questions for this. Help me out with one, then I'll try to figure out the rest.
  49. Chemistry

    The decomposition of hydrogen iodide on a gold surface at 150 oC HI(g) ½ H2(g) + ½ I2(g) is zero order in HI with a rate constant of 1.20E-4 Ms-1. If the initial concentration of HI is 0.575 M, the concentration of HI will be 0.116 M after seconds have
  50. physics

    A student throws two beanbags in the air, one straight up and the other one at a 30° angle from the vertical. Both beanbags are thrown with the same initial velocity and from the same height. In your own words, explain which one will come back and hit the
  51. physics

    Calculate the distance traveled by the concrete brick after 0.5 s if it moves with an initial speed of 5 ft/s up the incline whose angle of inclination with the horizontal is 300. Given, coefficient of friction of the incline is 0.144 and g = 32 ft/s2
  52. Chemistry

    The decomposition of hydrogen iodide on a gold surface at 150 oC HI(g) ½ H2(g) + ½ I2(g) is zero order in HI with a rate constant of 1.20E-4 Ms-1. If the initial concentration of HI is 0.575 M, the concentration of HI will be 0.116 M after how many
  53. Math

    Use the digits of your birthday as the amount of your initial investment (i.e., 6/25 is $625), calculate the value of this investment after 10 years at 3.5% APR for interest compounded yearly, quarterly, monthly, and daily. What do you notice?
  54. physics

    A body is thrown vertically upwards at an initial velocity of 30m/s. Find the velocity after 2s and the time it takes to reach the maximum height.(TAKE g equal 10m/s2(square).
  55. maths

    You deposited 25000# in an account that earns 7% interest compounded monthly. A)write the first 6terms of the sequence if the initial deposit is excluded B)find the balance in the account after 5years
  56. physics

    A projectile is fired at 33.1° above the horizontal. Any effects due to air resistance are negligible. At the highest point in its trajectory, its speed is 15.5 m/s. Calculate the horizontal component of the initial velocity.
  57. PHYSICS NEED HELP ASAP

    A car traveling 16.0m/s crates into concrete embankment and steps in 0.08s. Calculate: the initial speed in mi/hr the average acceleration of the car during the collision in m/s^2 Please show all work than you
  58. NEED HELP ASAP PHYSICS

    A car traveling 16.0m/s crashes into concrete embankment and stops in 0.08s. Calculate: the initial speed in mi/hr the average acceleration of the car during the collision in m/s^2 Please show all work than you
  59. physics

    Sally the bug has an initial speed of 20.0cm/s. She then accelerates at 8.00cm/s^2 for 5.00s. calculate sallys total displacement? which i did and got 200 cm Displacement during the 5th second? can you please help and show all work
  60. physics

    A projectile is launched at an angle of 54.6 degrees above the horizontal with an initial speed of 225 m/s and lands at the same level from which it was launched. The range is 205 meters. The time of flight is how many seconds?
  61. physics

    A man skis down from the top of a hill 1500.0 m high, starting from rest. If he loses 50% of his initial mechanical energy to friction during his descent, what is his speed in m/s at the base of the hill?
  62. Physics

    A stone is thrown from ground level at 72 m/s. Its speed when it reaches its highest point is 46 m/s. Find the angle, above the horizontal, of the stone's initial velocity. Answer in units of degree
  63. pre calc

    An initial investment of $12,000 is appreciated for 5 years in an account that earns 7% interest, compounded quarterly. Find the amount of money in the account at the end of the period
  64. kenson r

    550 g of water (cw = 4186 J/kg.K) at 75°C is poured into an 855 g aluminum (cw =900 J/kg.K) container with an initial temperature of 11°C. What is the final temperature of the system, assuming no heat is exchanged with the surroundings?
  65. Physics

    A box is given a quick push so that it slides along a horizontal floor. a) What is its acceleration if the coefficient of kinetic friction is 0.30? b) How far will it travel if its initial speed was 3.0m/s? Is it possible to find the acceleration when only
  66. algebra

    A rocket is launched from atop a 105ft cliff with initial velocity of 156 ft/s Height above ground a time t is given -16t^2 + 156t + 105 = h. When will it hit the ground after launch?
  67. Physics

    A 2569 kg van runs into the back of a 827 kg compact car at rest. They move off together at 8.5 m/s. Assuming the friction with the road can be negligible, find the initial speed of the van.
  68. physics

    A 1.85 m tall basketball player attempts a goal 9.3 m from a basket (3.05 m high). If he shoots the ball at a 45° angle, at what initial speed must he throw the basketball so that it goes through the hoop without striking the backboard?
  69. AP Calc Help!!

    Let f be the function satisfying f'(x)=x√(f(x)) for all real numbers x, where f(3)=25. 1. Find f''(3). 2. Write an expression for y=f(x) by solving the differential equation dy/dx=x√y with the initial condition f(3)=25. Please show work and
  70. Physics(Please check)

    A 5-kg ball is thrown straight up in the air with an initial speed of 24m/s. After its release and before it hits the ground when is the ball in free fall? My answer is at all times. Is this correct? Thank you.
  71. college math

    An initial investment of $1000 is appreciated for 4 years in an account that earns 6% interest, 2) compounded semiannually. Find the amount of money in the account at the end of the period.
  72. physics

    A toy rocket is fired off a platform with an initial speed of 223 ft/sec at an angle of elevation of 32 degrees and achieves a maximum height of 291 ft. How how above the ground was the platform?
  73. Common Core Math II A-CR

    A firework is launched into the air from ground level with an initial velocity of 128 ft/s. If acceleration due to gravity is –16 ft/s2, what is the maximum height reached by the firework?
  74. physics

    A ski jumper leaves a slope at an angle of 20.0 degrees above the horizontal direction. She lands 3.50 seconds later at a point 20.0 meters below her take-off point. (a) What was her initial speed? (b) How far does she travel horizontally?
  75. physics

    A newly established colony on the Moon launches a capsule vertically with an initial speed of 1.453 km/s. Ignoring the rotation of the Moon, what is the maximum height reached by the cap
  76. physics

    A 2561-kg van runs into the back of a 823-kg compact car at rest. They move off together at 8.5 m/s. Assuming the friction with the road is negligible, calculate the initial speed of the van.
  77. Math Analysis

    5. The bacteria population doubles every 10 hours. How long will it take to triple the initial amount? (Use log 3 / log 2 = 1.585) ==> I thought you could use the formula A(1/2)^(t/h), but I don't know... Any help is GREATLY appreciated!! :D
  78. Physics

    You shoot a rocket straight into the air from the ground.It takes 8.0 seconds to come back down to the ground.What was its initial velocity ? Vf^2=Vi^2+2ax 0=vi^2+2(-9.8)(8.0) <----- My work vi^2=-156.8 I don't how to solve the last step
  79. physics

    I'm very confused. What is the range of an arrow shot horizontally at 85.3 m/s if it is initially 1.5m above the ground? I'm guessing 1.5 is delta Y and initial velocity at 85.3 m/s and final velocity at 0 m/s. I just don't understand how I'm supposed to
  80. physics

    A ball is projected horizontally from the top of a 98m high cliff with an initial speed of 14.4 m/s. Determine the magnitude of the final speed the instant prior to hitting the ground
  81. Physics Honors

    A football is kicked with an initial velocity of 25 m/s at an angle of 45 degrees with the horizontal . Determine the time of flight, the horizontal distance, and the peak height of the long jumper.
  82. physics

    A soccer ball leaves the foot of a player with an intitial velocity of 22 m/s at an angle of 30 degrees above the positive x-axis. What is the initial velocity in the x-direction? Two sigfigs Remember...no units...but it would be in m/s
  83. physics

    A soccer ball leaves the foot of a player with an intitial velocity of 22 m/s at an angle of 30 degrees above the positive x-axis. What is the initial velocity in the y-direction? Two sigfigs Remember...no units...but it would be in m/s
  84. Calc

    At the time of the birth of a child, a parent wants to begin a college fund that will grow to $50000 by the child's 18th birthday. Interest is compounded continuously at 8.5%. What should the initial investment (P0) be?
  85. Physics

    A 2563-kg van runs into the back of a 826-kg compact car at rest. They move off together at 8.5 m/s. Assuming the friction with the road is negligible, calculate the initial speed of the van.
  86. Physics

    A 65.0 kg skier with an initial speed of 11.0 m/s coasts up a 2.50 m high rise as shown in Figure 6.23. Find his final speed at the top, given that the coefficient of friction between her skis and the snow is 0.0800.
  87. physics

    A parachutist jumps out of airplane with an initial speed of 2.0 m/s downwards. There is a force of air resistance equivalent to 305 N. Determine the parachutist’s mass if it takes a total of 3 seconds for him to travel 30 m downwards.
  88. Physics

    ______1. Which of the following is NOT true about a stone dropped from the third floor of the high school building? A. It is a free-falling object. B. It accelerates at the rate of 9.8 m/s2. C. It decelerates at the rate of 9.8 m/s2. D. Its initial
  89. Math

    Use the digits of your birthday as the amount of your initial investment (i.e., 6/25 is $625), calculate the value of this investment after 10 years at 3.5% APR for interest compounded yearly, quarterly, monthly, and daily. What do you notice?
  90. Physics kinematics

    the general "hang time" of a punt is measured to be 4.5sec. if the ball was kicked @ an angle of 63deg. above the horizontal & was caught @ the same level from which it was kicked, what was its initial speed?
  91. Grammar

    The patient was admitted to the floor for abdominal pain and diarrhea, initial diagnosis was a possible small-bowel obstruction. A) complete sentence B) fragment C) run-on Seems like C would be the best answer as a run-on
  92. physics

    An apple of mass 0.1kg is thrown from a 123 meter high building at an angle of 45 degrees with an initial velocity of 5. How long does it take for the apple to hit the ground? (assume g = 9.8 m.s-2)
  93. Physics

    3. A projectile is launched at 10.0 m/s in a direction 45.0 degrees above the horizon. It hits the ground 10.0 m below its initial position. What is its speed just before hitting the ground? Ignore air resistance. The answer is supposed to be 17.2 m/s.
  94. physics

    A 2561-kg van runs into the back of a 823-kg compact car at rest. They move off together at 8.5 m/s. Assuming the friction with the road is negligible, calculate the initial speed of the van.
  95. physics

    A 2561-kg van runs into the back of a 823-kg compact car at rest. They move off together at 8.5 m/s. Assuming the friction with the road is negligible, calculate the initial speed of the van.
  96. counseling

    During the initial session, counselors should be sure to assess clients for each of the following problems except for a. if there is an actual plan. b. the availability of the method and the degree to which the method is lethal. c. past, present, and
  97. physics

    a boy throws a stone straight upward with an initial speed of 15 m/s on the surface of the earth. what maximum height above the starting point will the stone reach before falling back down?
  98. HELP PLEASE

    A 2.0kg block of wood starts at rest and slides down a ramp. Its initial height is 12.0m. If the final velocity of the block is 13m/s, determine the energy of this system that has been turned into heat.
  99. Chemistry

    Does the reaction between CO2(g) + Mg(OH)2(aq) produce MgCO3(s) + H2O(l) or Mg(HCO3)2 ??? Normally, Mg(CO3)2 but I suspect an excess of CO2 will produce the bicarbonate. For example, CO2(g) + Ca(OH)2(aq) ==> CaCO3(s) + H2O(l) and that is often done by
  100. chemistry

    The formate ion, (CHO2-), is related to the acetate ion and forms ionic salts with many metal ions. Assume that 9.7416 g of M(CHO2)2 (where M represents the atomic symbol for a particular metal) are dissolved in water. When a solution of 0.200 M sodium