1. Chem-help

    What mass of precipitate will form if 1.50 L of concentrated Pb(ClO3)2 is mixed with 0.750 L of 0.290 M NaI? Assume the reaction goes to completion.

    asked by Anonymous on July 7, 2012
  2. Chemistry

    What type of reaction is photosynthesis, the process where carbon dioxide combines with water to form glucose in the presence of sunlight?

    asked by josie on June 18, 2014
  3. chemistry

    Whatis the chemical name of the substance formed in the slow reaction that takes place when iron filings are mixed with water?

    asked by B on September 13, 2008
  4. chemistry

    If the half-life of a first-order decomposition reaction is 24.2 minutes, how long will it take for 10.0 moles of the reactant to decompose so that only 2.5 mol remains?

    asked by Josh on September 4, 2012
  5. science

    identify the type of reaction when hydrogen sulphide gas burns in oxygen to give water and sulphur dioxide

    asked by shivani on June 16, 2016
  6. Chemistry

    If the activation energy for a given compound is found to be 42.0 kJ/mol, with a frequency factor of 8.0 × 1010 s-1, what is the rate constant for this reaction at 298 K?

    asked by Kelsei on April 2, 2014
  7. chemistry

    Choose the term that best describes the following chemical reaction: C10H8 + 12 O2 10 CO2 + 4 H2O A. synthesis B. combustion C. electrolytic D. decomposition

    asked by ashley on November 29, 2011
  8. chemistry

    calculate the number of grams of Al2S3 which can be prepared by the reaction of 20g of Al and 30gm of sulphur. how much the non_limiting reactant in excess?

    asked by Ahsan on May 6, 2016
  9. stoichiometry

    How many grams of Nitric oxide are required to produce 145g of nitrogen in this reaction: Al2O3(s)+6NO(g)---->5N2(g)+6H2o(l)

    asked by mandy on November 17, 2011
  10. chemistry

    Complete and balance the displayed half reaction in neutral aqueous solution taking into account the electrons. Mg(s) → Mg2+(aq)

    asked by andy on June 1, 2010
  11. chemistry

    Use Hess's Law and a table of heats of formation to determine the enthalpy for the following reaction. 3SO2(g) + 3H2O(g) + 3/2O2(g) --->3H2SO4(l) ΔH = ?

    asked by korko on September 28, 2014
  12. Chemistry

    2 Ch(aq) + Em(aq) + Is(s) + T(g) ⇄ Ry(aq) + 3 Ro(s) + 4 X(g) ΔHrxn=35.6 kJ/mol Name three things that you could do to make the equilibrium below run to the left. What direction would the reaction shift if you added water? Please help me!!

    asked by Kat on May 24, 2011
  13. chemistry

    In a certain chemical reation, two reactants undergo change to form two products. Why can't you determine what type of reaction occurred from this information?

    asked by Bubba on November 25, 2008
  14. chemistry

    Use Hess's Law and a table of heats of formation to determine the enthalpy for the following reaction. 3SO2(g) + 3H2O(g) + 3/2O2(g) --->3H2SO4(l) ΔH = ?

    asked by korko on September 28, 2014
  15. Chemistry

    What is the value of the equilibrium constant at 25°C for the reaction between each of the following? (a) Sn(s) and Pb2+(aq) (b) Cr(s) and Cu2+(aq) I have been unable to get either and have spent the last two hours attempting it. I have been using the

    asked by Caroline on May 4, 2015
  16. cHEMISTRY

    What mass of AgCl(143.32g/mol) is formed from the reaction of a 0.109 M MgCl2 solution with excess AgC2H3O2?

    asked by lIZ on February 29, 2016
  17. science

    calculate the volume of gas at STP that is produced when 1g of silver nitrate is heated. the unbalanced reaction is: AgNO3(s)=Ag(s)+NO2(g)+O2(g)

    asked by Mahlako on May 18, 2015
  18. 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?

    asked by Hannah on February 29, 2012
  19. chemistry

    What volume of 16M HNO3 is required to dissolve 0.50g of Cu metal in the following reaction? Cu(s) + 4HNO3(aq) ---> Cu(NO3)2 + 2H2O + 2NO2

    asked by Alex on February 3, 2011
  20. chem

    Given: 3H2(g) + N2(g) 2NH3(g) If the reaction starts with 0.500 mol of H2, how many atoms of hydrogen in the compound NH3 would you expect to make?

    asked by kp on February 13, 2010
  21. chemistry (DrBob222)

    A student fails to fill the cuvette 2/3 full with the reaction mixture ( CV+ and OH-). What effect does this error have on the measured absorbance values? Thank you :)

    asked by K on October 9, 2013
  22. Chemistry

    what mass of water will be formed by reaction of 3.50g of methylamine (8CH3NH2) with 15.0g of perchloric acid (13HClO4)? Answer is 99.1. How do you work this?

    asked by Michelle on November 6, 2012
  23. Chemistry

    A student observed the following reaction: AlCl3(aq)+3NaOH(aq) -> Al(OH)3(s)+3NaCl(aq) After the products were filtered, which substances remained on the filter paper and why?

    asked by P on March 7, 2009
  24. chem

    For the reaction 2Cl2(g)+4NaOH(aq)->3NaCl(aq)+ NaClO2(aq)+2H2O(l) how many grams of NaCl can be produced from 30.8 g of Cl2 and excess NaOH?

    asked by jann on May 16, 2011
  25. Chemistry

    How much heat (in kilojoules) is evolved or absorbed in the reaction of 2.65 g of Na with H2O? 2Na+2H2O ---> 2NaOH + 2H2 Delta H= -368.4

    asked by Anonymous on February 17, 2010
  26. chemistry

    the thermal decompostion of 26.4g of CaCo3 produced10.6g calcium and 3.17g carbon. calculate the mass of oxygen produced in this reaction.

    asked by Mary on February 13, 2011
  27. Chemistry

    Calculate the cell potential for the following reaction as written at 25.00 °C, given that [Cr2 ] = 0.875 M and [Ni2 ] = 0.0100 M. I keep on getting the answer .42 which is incorrect. Thank you so much in advance!

    asked by Julia on April 23, 2017
  28. organic chemistry

    If, by mistake, a chemist used 100% ethanol rather than diethyl ether as the reaction solvent, would the Grignard synthesis still proceed as expected?

    asked by Blair on February 27, 2009
  29. 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?

    asked by Brittany on March 22, 2013
  30. chemistry

    Al2O3(s)+6NO(g)---->5N2(g)+6H2O(l) how many grams of Nitric Oxide are required to produce 145g of nitrogen in the following reaction?

    asked by Mandy on February 27, 2012
  31. chem

    IF a reation generally takes 40 seconds to occur at 45 degrees C, how long should the reaction take a t the following temperatures? A. 35C B. 55C C. 65C

    asked by john on January 18, 2012
  32. chemistry

    write a balanced chemical equation for the process of photosynthesis and the conditions of the reaction giving physical state of all the substances

    asked by aakriti on June 15, 2015
  33. chemistry

    if the activation energy for a given compound is found to be 10 kJ/mol, with a frequency factor of 4.0x10^13 s-1, what is the rate constant for this reaction at 398K?

    asked by hall on February 26, 2012
  34. chem

    What volume of benzene (C6H6,d=0.88g/ml,molar mass=78.11g/mol) is required to produce 1.5 x 10^3 kJ of heat according to the following reaction?

    asked by Melissa on November 18, 2013
  35. chemistry

    How many grams of Nitric oxide are required to produce 145g of nitrogen in this reaction: Al2O3(s)+6NO(g)---->5N2(g)+6H2o(l)

    asked by mandy on November 16, 2011
  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.

    asked by Aiyana on January 29, 2017
  37. Chemistry ( I NEED HELP REAL QUICK )

    How much Al is needed to react with 675 mL of 0.655M HCl solution according to the reaction => 2Al + 6HCl→2AlCl3+ 3H2 Help your friend!

    asked by Farrell on May 25, 2015
  38. chemistry

    methane(g) +water= carbon monoxide(g)+Hydrogen (g) use the bond energies in the following table to predict the delta H foe the reaction

    asked by michael on November 18, 2014
  39. Chemistry

    Write the net ionic equation for the reaction between sulfuric acid and potassium hydroxide. I got 2H^+ + 2OH^-1 ==> 2H2O. Is this correct?? Thanks.

    asked by Lucy on December 2, 2007
  40. 7th grade

    A Pyrotechician is working on a new fourth of July rocket. He is using a highly reactive metal when burned. What can he use to lower the reaction rate????

    asked by Anomynous on January 14, 2010
  41. Chemistry

    The equilibrium constant for the reaction: 2NO(g)+Br2(g)2NOBr(g) Kc=1.3x10^-2 at 1000 Kelvin Calculate Kc for: NOBr(g)NO(g)+ 1/2Br2(g)

    asked by Colin on February 26, 2012
  42. chemistry

    What is the molarity of ZnCl2 that forms when 19.0 g of zinc completely reacts with CuCl2 according to the following reaction? (Assume a final volume of 195 .)

    asked by jiy on February 27, 2012
  43. Chemistry

    -CORRECTION- N2 + O2 --> 2 NO change in heat (delta H)= 43.2 kcal based on the reaction, which statement is true? a) 43.2 kcal are consumed when 1.00g of O2 reacts b) 43.2 kcal are consumed when 1.00g of N2 reacts c) 43.2 kcal are consumed when 1.00g of NO

    asked by Katie Y. on November 2, 2009
  44. strength of materials

    Bar BC in the figure has length L, constant cross sectional area A, and is composed of a homogeneous material with modulus E. The bar is fixed between walls at B (x=0) and C (x = L). The bar is subjected to a variable distributed load per unit length,

    asked by ashwni on July 17, 2016
  45. Physics

    Bar BC in the figure has length L, constant cross sectional area A, and is composed of a homogeneous material with modulus E. The bar is fixed between walls at B (x=0) and C (x = L). The bar is subjected to a variable distributed load per unit length,

    asked by skrillex on July 17, 2016
  46. Supervision and leadership

    What Should I Do Next? What Should I Do Next? Kim Allred is relatively new as a supervisor, having been promoted only two months ago. Before her promotion, she had worked for the company for seven years as a sales specialist in office equipment. There is

    asked by Ree on April 24, 2008
  47. Chemistry s103 Q5

    struggling to get this to come out right: Compound 1 CH2=CH-CH-OH | CH3 + Compound 2 O || CH3-CH-CH2-C | OH | | ? (i) identify any functional groups in compounds 1 & 2 by circling them and naming them clearly. (ii) complete the equation for reaction 1 by

    asked by Desmond on March 8, 2007
  48. AP Biology

    How would I calculate water potential? I have the formula but I can't figure out what to plug in. I only have a data table including initial and final mass of a concentration and the molarity of the concentration.

    asked by anonymous on September 20, 2018
  49. Chemistry

    After the initial 1 mL of 0.2 M FeCl3 (aq) and 1 mL of 0.2 M KSCN (aq) were combined it was then diluted with an additional 130 mL of deionized water. Which way would this dilution cause the equilibrium to shift? Is a dilution going to be a stress in all

    asked by kelly on April 3, 2017
  50. Physics

    A 0.45-kg soccer ball is kicked at an angle θ above the ground with initial speed vi. Determine the height of the ball as a function of the horizontal distance d it travels down the field.

    asked by Mat on November 1, 2016
  51. phicis

    a rock is dropped from a cliff and reaches the ground in 2.70s . At the same time another rock is thrown horizontally from the same height with initial x velocity of 0.95 m/s. what distance will in x will the second recover?

    asked by carlos on February 3, 2019
  52. Physics

    A skateboarder with an initial speed of 3.1-m/s, rolls virtually friction free down a straight incline of length 18-m in 3.2-s. At what angle (in degrees) is the incline oriented above the horizontal?

    asked by james on September 15, 2017
  53. Science

    A football is thrown upward at 34 degrees angle to the horizontal. The acceleration of gravity is 9n8. To throw the ball a distance 66.7m what must be the initial speed of the ball

    asked by Anonymous on November 2, 2018
  54. math

    You invest money that pays 6.3% interest/year compounded quarterly. How long should you invest if want to double initial investment? I tried A=P(1+r/n)^nt, but it didn't work, using A=2P. the principle is not given. Please help

    asked by BJ - help please on November 8, 2011
  55. Scientific studies

    A toy air rocket is launched vertically with an initial velocity of 22m/s. (a) How long does it take to reach its maximum height (v=0m/s? (b) How long does it take to return to the ground (x-0m)?

    asked by Aly on February 17, 2010
  56. Physis

    An arrow is horizontally projected from the top of a tower with an initial velocity of 15m/s.if it reaches the ground 7seconds later,calculate the height of the tower (let g=10m/s0).

    asked by Sylvester on October 15, 2015
  57. Physics

    A ball is thrown upward from the ground with an initial speed of 25 m/s; at the same instant, a ball is dropped from rest from a building 15 m high. After how long will the balls be at the same height?

    asked by Shayla on September 20, 2012
  58. Physics- Projectiles

    A marlin jumps out of the water with an initial velocity of 5.0 meters per second at an angle of 80 degrees above horizontal. Approximately what maximum height will the marlin reach during it's flight?

    asked by Olivia on October 24, 2012
  59. physics

    A ball is thrown upward from the ground with an initial speed of 25 m/s; at the same instant, a ball is dropped from rest from a building 15 m high. After how long will the balls be at the same height?

    asked by Shayla on September 20, 2012
  60. Physics

    A stone is thrown vertically upward at an initial speed of 10m/s. Find the total time of the flight and the maximum height reached by the stone.

    asked by Jane on February 8, 2016
  61. physics

    A startled armadill leaps upward rising .536 m in the first .197 s. What is its initial speed as it leaves the ground? What is its speed at the height f .536m? How much higher does it go?

    asked by Kristen on September 9, 2007
  62. physics

    A skier leaves the top of a ski ramp at an angle of 25 degrees with an initial velocity of 10 m/s. The ramp is 60 m high, neglecting air resistance determine:

    asked by T on October 1, 2015
  63. phyics

    Find the horizontal range of a baseball that leaves the bat at an angle of 63 degrees, with the horizontal with an initial velocity of 160 km/hr. discard air resistance

    asked by Brittany on December 14, 2011
  64. Physics

    A figure skater glides along the ice at 2.2 m/s , she then accelerates at 1.3 m/s^2 for 3.0 seconds. At the end of that time she is moving at 6.1 m/s. What would be the angle between the acceleration vector and the initial velocity vector? .. please help

    asked by Harold on January 15, 2009
  65. physics

    Suppose 32000 radioactive nuclei are in a sample. About how many remain after two days if the half-life is 22 hrs? What is the initial activity of the sample in decays per minute?

    asked by Anonymous on May 5, 2009
  66. Physics

    A rocket of mass 50 kg is launched vertically. Its fuel is being burnt at a rate of 2 kg s-1 and its exhaust gas is being forced out with a speed of 1000 m s-1. What is the initial acceleration of the rocket?

    asked by okw on September 8, 2016
  67. 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?

    asked by darian on May 9, 2015
  68. Physics

    A startled armadillo leaps upward rising .536 m in the first .197 s. What is its initial speed as it leaves the ground? What is its speed at the height of .536m? How much higher does it go?

    asked by Kristen on September 9, 2007
  69. physics

    Suppose the ball is kicked horizontally with an initial speed of 9.37m/s. If the ball travels a horizontal distance of distnace 85 meters, how tall is the mountain?

    asked by Brooke on November 14, 2011
  70. Physics

    On piercing a distance of 15cm in a wooden block a bullet losses of its initial velocity before coming to rest the further distance travelled by it is Ans:5cm

    asked by Thousif on January 8, 2018
  71. Physics

    An object is thrown upwards at an initial speed of 19.6 m/s from a height of 65m. Determine how long will take for the object to reach the ground (time of flight). what formula should i use?

    asked by Anna on August 29, 2012
  72. physics in kinematics

    ebo throws a ball in the air it's velocity at the start is 18m/s at an angle of 37° to the ground express the initial velocity in component vector form?

    asked by Na on December 30, 2015
  73. chemistry

    assuming that the calorimeter contains 5.00 * 100 g of water and that the initial temperature is 30.0 degree celcius. what will the final temperature be? (use the proper formula and units, and show your work below)

    asked by alice on October 9, 2007
  74. chemistry

    sorry i forgot some of the units in the initial posting 8.00g of NaOH are dissolved in water to make 4.00L of solution. What is the concentration of hydronium ions, , in this solution?

    asked by katy on November 2, 2009
  75. science (physics)

    how far will a stone travel over level ground if it is thrown upward at an angle 30 with the horizontal and with a speed of 12m/s?what maximum range could be achieved with the same initial speed?

    asked by tena on June 30, 2016
  76. last one i promise....physics

    A startled armadill leaps upward rising .536 m in the first .197 s. What is its initial speed as it leaves the ground? What is its speed at the height f .536m? How much higher does it go?

    asked by Kristen on September 10, 2007
  77. Physics

    A rocket leaves the launch pad heading straight up with a constant acceleration of 60 m/s^2 \. its initial stage booster runs out in 25 seconds. How high is the rocket?

    asked by Caden on October 25, 2016
  78. Physics

    A ball thrown vertically upward is caught by the thrower after 20.0 s. FInd (a)the initial velocity and (b) the maximum height it reaches. All I am given is time. How am I suppose to find (a) and (b)?

    asked by Anonymous on September 12, 2007
  79. Physics

    A golf ball having an initial speed of 50m/s with an angle of 30 degree what is time of flight and range and velocity it which it hits the ground at the end of flight

    asked by Sachin on August 8, 2018
  80. Chemistry

    2KClO3 ----> 2KCl + 3O2 Calculate the number of grams of KClO3 decomposed given an initial sample mass of 2.16g and a residue mass of 1.71g?

    asked by Anonymous on October 7, 2012
  81. Chemistry

    What was the initial temperature of a sample pf silver that released 1207 joules when 150.0 grams of this metal were transferred to a cooler temperature of 60 degress Celsius?

    asked by Michaela on May 15, 2012
  82. Physics

    An object is freed from the top of the tower at an altitude of 39.2m. At the same time, another substance is thrown at an initial speed of 19.6 m per sec. At what time both the objects and the height of the cave get?

    asked by Krinal on July 14, 2018
  83. physics

    a pelican flying a horizontal path drops a fish from a height of 5.0m. the fish travels 8.1m horizontaly before it hits the water below. what was the pelicans initial speed?

    asked by gaby on September 26, 2012
  84. physics

    3813.75 Joules of work is being done on a 150 lb object while it is moved 75 ft across a horizontal plane, what is the final velocity if the coefficient of kinetic friction is 0.25 and the initial velocity is 1 ft / s?

    asked by Adam on May 7, 2014
  85. physics

    A projectile is shot at a 37 degree angle from the edge of a cliff h = 305 m above ground level with an initial speed of v0 = 125 m/s how much time will it take to hit the ground

    asked by memo on October 8, 2010
  86. physics

    A stone is thrown from ground level at 70m/s. Its speed when it reaches its highest point is 48 m/s. Find the angle, above the horizontal, of the stone’s initial velocity.

    asked by Anonymous on September 30, 2011
  87. physics

    A flare is fired at an angle of 35 degrees to hit the ground at an initial speed of 250 m/s. How long dies it take for the flare to reach its maximum altitude?

    asked by Anonymous on September 27, 2010
  88. Physics

    3813.75 Joules of work is being done on a 150 lb object while it is moved 75 ft across a horizontal plane, what is the final velocity if the coefficient of kinetic friction is 0.25 and the initial velocity is 1 ft / s?

    asked by Adam - Require some Help Please on May 7, 2014
  89. Physics

    A gunman shoots from a riffle in a horizontal direction without correcting for gravity. How much below the intended target, at a horizontal distance, will the bullet strike if its initial speed is Vo??

    asked by Jasalle on March 1, 2011
  90. Physics

    A mass m is traveling at an initial speed of v0 = 25.0 m/s. It is brought to rest in a distance of 62.5 m by a force of 15.0 N. The mass is? Could you just enlighten me on what formula to use please.... little lost although I think the answer is 37.5kg am

    asked by Femfatal on February 13, 2011
  91. physics

    While on the moon, the apollo astronauts enjoyed the effects on gravity so much smaller then that ont he earth. If neil armstrong jumped up on the moon with the initial speed

    asked by Casey on April 18, 2011
  92. Physics

    A gunman shoots from a riffle in a horizontal direction without correcting for gravity. How much below the intended target, at a horizontal distance, will the bullet strike if its initial speed is Vo??

    asked by Jasalle on March 1, 2011
  93. Physics

    A car drove a total 5km. Accelerated 10seconds then had a constant velocity. Entire trip was 45 seconds. Was was the initial acceleration and final velocity?

    asked by Tim on January 31, 2011
  94. Physics

    Two particles each have a mass of 5.5 10-3 kg. One has a charge of +4.8 10-6 C, and the other has a charge of -4.8 10-6 C. They are initially held at rest at a distance of 0.88 m apart. Both are then released and accelerate toward each other. How fast is

    asked by Anonymous on February 18, 2013
  95. physics

    A cannonball is fired horizontally from a 240 {m}-high cliff toward a vertical building 720 {m} away with an initial velocity of 120 {m/s}. When the ball will hit the building? in a. 7.00 {s} b. 6.00 {s} c. less than 6.00 {s} d. more than 7.00 {s}

    asked by andrea on January 25, 2011
  96. Corprate Finance

    An initial investment of $400,000 will produce an end of year cash flow of $480,000. What is the NPV of the project at a discount rate of 20%?

    asked by Karen on April 23, 2010
  97. Physics

    A sample of a monatomic ideal gas is originally at 20 °C. Calculate its final temperature of the gas if the pressure is doubled and volume is reduced to one-fourth its initial value.

    asked by nbi on October 15, 2013
  98. physics

    An astronaut wearing a 20-kg spacesuit jumps on the moon with an initial velocity of 16 m/s. On the moon, the acceleration due to gravity is 1.62 m/s squared. What is the maximum height he reaches?

    asked by Kelly on October 7, 2013
  99. Physics

    A uniform solid ball rolls smoothly along a floor, then up a ramp inclined at 13.5 degrees. It momentarily stops when it has rolled 1.65 m along the ramp. What was its initial speed?

    asked by Kelsey on November 17, 2013
  100. Physics

    A car drove a total 5km. Accelerated 10seconds then had a constant velocity. Entire trip was 45 seconds. Was was the initial acceleration and final velocity?

    asked by Tim on January 31, 2011