1. Chemistry

    Predict the products and write a net ionic reaction for the reaction of cadmium chloride and ammonium sulfide.

    asked by Mary on March 27, 2010
  2. gr10 science

    The products of the reaction are iron (III) hydroxide and sodium chloride. How could I write a word equation for this reaction?

    asked by Rebecca on April 25, 2011
  3. chemistry

    The reaction x products follows Ist order kinetics in 40 minutes the concetration of x changes from 0.1M to 0.025M then the rate of reaction when conc of x is 0.01

    asked by ameer on April 26, 2013
  4. Chemistry

    for a particular reaction H=-28.4 KJ and S=-87.9 J/K. Assuming these values change very little with temperture, over what temperature range is the reaction spontaneous in the forward direction?

    asked by Joshue on July 29, 2011
  5. chemistry

    How many liters of HCl are produced by the reaction of 5.7 L of hydrogen with an equal amount of chlorine? The reaction occurs at STP.

    asked by Alondra on December 6, 2011
  6. CHEMISTRY

    We have this reaction : HCO3- + OH- => CO3^-2 + H2O Specify the conjugate pairs and , which direction the reaction equilibrium shift ? and How ( as a rule ) ?

    asked by MAD on July 14, 2014
  7. Chem

    A certain reaction has an activation energy of 66.58 kJ/mol. At what Kelvin temperature will the reaction proceed 4.50 times faster than it did at 289 K?

    asked by Anonymous on March 13, 2014
  8. Science

    If the concentration of AgCl drops from 1.000 M to 0.655 M in the first 30.0 s of the reaction, what is the average rate of reaction over this time interval?

    asked by Rose on February 5, 2015
  9. chemistry

    Al2O3+6HCl----->AlCl3+3H2O what type of reaction is this? -combination -decompisition -or double displacement reaction

    asked by Mandy on February 27, 2012
  10. why will no one answer? chem

    If the reaction Cl2 (g) + O3 (g) = Cl2O (g) + O2 (g) occurred in just two steps, what would be the overall order of the reaction be? a. 1 b. 2 c. 3 d. 4 e. not possible to determine from the information given i have absolutly no idea how to do this

    asked by john117 on February 27, 2012
  11. Chemistry

    A certain reaction has an activation energy of 25.65 kJ/mol. At what Kelvin temperature will the reaction proceed 5.50 times faster than it did at 291 K?

    asked by Ryan on March 1, 2013
  12. Science

    Which of the following is true about photosynthesis? A. It is an exothermic reaction. B. It is an endothermic reaction. C. It produces carbon dioxide. D. It occurs in animals.

    asked by Anonymous on February 6, 2019
  13. chem.

    A certain reaction has an activation energy of 66.58 kJ/mol. At what Kelvin temperature will the reaction proceed 4.50 times faster than it did at 289 K

    asked by Anonymous on March 14, 2014
  14. chemistry

    If the reaction Cl2 (g) + O3 (g) = Cl2O (g) + O2 (g) occurred in just two steps, what would be the overall order of the reaction be? a. 1 b. 2 c. 3 d. 4 e. not possible to determine from the information given i have absolutly no idea how to do this

    asked by john117 on February 27, 2012
  15. chemistry

    A certain reaction has an activation energy of 25.14 kJ/mol. At what Kelvin temperature will the reaction proceed 8.00 times faster than it did at 305 K?

    asked by Tsomo on July 13, 2014
  16. help please?!

    If it takes 30 seconds for a reactant concentration to decrease from 1.0 M to 0.5 M in a first-order chemical reaction, then what is the rate constant for the reaction?

    asked by jameson on September 9, 2016
  17. science-CHEM

    Fe+3 + SCN- ==Fe(SCN)+2 if adding NaOH will form precipitates, but what is the precipitates' formula? And after this reaction, if we add HCl to the reaction, will the precipitates dessolve? What does the HCl affect the reaction? THX

    asked by Nicola on November 21, 2008
  18. chemistry

    Equilibrium is established in a reversible reaction when: A)the [product] = [reactants] B)rate of reaction of products = rate of reaction of reactants C)all the reactants dissolve or dissociate D)products are no longer produced

    asked by need help asap! on June 19, 2014
  19. chemistry

    write the equations for the substitution reaction of methene with bromine under the following conditions. a) reaction in the presence of sunlight CH4+Br2 sunlight=? b) reaction in the absence of sunlight CH4+Br2 =?

    asked by denis on November 22, 2011
  20. Chemistry

    Barium carbonate and nitric acid reacts in a double displacement reaction. One of products also dissociates and evolves carbon dioxide. Write the net ionic reaction including the proper use of phase labels for this solution run in aqueous solution. After

    asked by Holly on June 24, 2013
  21. Chemistry

    X(g)+ 2Y(s) + 3Z(g) ⟶ 2L(g) + 4T(g) If this reaction occurs in one step, what is the order of this reaction? I am not even sure what this means. Could someone explain?

    asked by Summer on April 11, 2018
  22. Chemistry

    Ok, so in an when an endothermic reaction occurs, is it hot or cold? and why? Also what is it for an exothermic reaction? Thank you

    asked by K on May 31, 2013
  23. chemistry

    Given the reaction 1/2 N2( g) + 3/2 H2 (g) ___> NH3 (g) +11.0kcal.Is this reaction exothermic or endothermic?

    asked by faisal on April 8, 2012
  24. Science at National University OF Samoa

    2-bromobutane heat with 2M NaOH. What is the observation and the chemical reaction for the reaction?

    asked by Terry Manu on April 13, 2016
  25. Chemistry

    Since decomposition is an endergonic reaction. Does this mean it's reverse reaction synthesis is exothermic?

    asked by kevin on August 3, 2009
  26. physical science(chemistry)

    Why can chemical methods not be used to determine the reaction rate at different stages of the reaction?

    asked by tsakani on January 17, 2013
  27. chemistry

    For the reaction HCO3- H+ + CO32-, ΔG° = +59.0 kJ/mol at 298.15 K. Find the value of K for the reaction

    asked by yous on January 12, 2012
  28. chemistry

    what is the oxidation half-reaction in the following chemical reaction? fe(s) + 3 agno3 -> ag + fe(no3)3

    asked by Anonymous on April 3, 2014
  29. Chem

    Why do the rate of reaction for a reversible reaction slows down at equilibrium stage.

    asked by Rose on March 10, 2012
  30. Chemistry

    Show that the reaction caco3 ->cao+co2 is not a redox reaction

    asked by Anonymous on November 13, 2015
  31. chemistry

    What type of reaction would CO2 + H2O --> H2CO3 be I think it would be synthesis reaction?

    asked by Kiki on November 3, 2014
  32. science

    Given the following reaction, with Kp=1.05 at 250 degrees C what is Kc? The reaction is PCl5 to PCl3+Cl2

    asked by Nick on April 13, 2010
  33. chemistry

    for an exotherimic reaction incresing the reaction temperature results in a (n)___k ?

    asked by jay on March 22, 2011
  34. sun shine high shcool

    during the reaction the temperature of 50cm of solution tell by 10centigrade, how much energy did the reaction take in?

    asked by zeynab tahir on June 16, 2014
  35. Chemistry

    What chemical compound is formed in the reaction when 6M HCl and 1M NaOH is reaction?

    asked by Sheila on August 30, 2012
  36. Chemistry

    Show that the reaction caco3 ->cao+co2 is not a redox reaction

    asked by Pooja on November 13, 2015
  37. chemistry

    balanced reaction for reaction between ferrous sulphate and nittric acid

    asked by sanju on December 13, 2011
  38. Chemistry

    How does the activation energy of an uncatalyzed reaction compare with that of the catalyzed reaction?

    asked by Gabby on March 1, 2010
  39. Chemistry

    Ok, so in an when an endothermic reaction occurs, is it hot or cold? and why? Also what is it for an exothermic reaction? Thank you

    asked by K on May 31, 2013
  40. phys.

    Hey, i feel kinda embarassed asking this because it looks so simple. a mass of 300kg which is positioned 1000m above the ground is allowed to fall to the ground. what will be its velocity on impact? Use the basic velocity formula. Initial velocity is zero;

    asked by jamie on October 7, 2006
  41. 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

    asked by sharon on November 29, 2015
  42. Physics

    A ball is fired from the ground with an initial speed of 1.36 103 m/s (approximately four times the speed of sound) at an initial angle of 49.0° to the horizontal. Neglect air resistance.

    asked by Nicola on March 22, 2013
  43. chemistry

    Question: When a pink aqueous solution of potassium permanganate, faintly acidified with dilute sulfuric acid was treated with 10% aq. hydrogen peroxide, the reaction took place with the evolution of gas bubbles, and the pink solution was turned colorless.

    asked by Shadow on May 5, 2011
  44. Physics - 2-D kinematics

    A soccer ball is kicked with an initial horizontal velocity of 20 m/s and an initial vertical velocity of 16 m/s. I've calculated: Initial Speed: 25.61 m/s Angle: 38.66 degrees Maximum Height it reaches: 13.06 m Distance kicked: 65.29m NOW I NEED: What is

    asked by Anonymous on February 3, 2012
  45. math

    after passing therough a material t centimeters thick, the intensity I(t) of a light beam is given by I(t) =(4^-ct)Io, where Io is the initial intensity and c is a constant called the absorption factor. Ocean water absorbs light with an absorption factor

    asked by Suzie on February 24, 2012
  46. Chem Help Please!

    Compare the relative reaction rates of 1-bromobutane, 2-bromopropane, and 2-bromomethylpropane under SN1 reaction conditions. Silver nitrate will be used to provide nitrate ion as the nucleophile to produce alkyl nitrates as products. 1) I found the answer

    asked by Jesicca on October 15, 2014
  47. Separation of Racemate- Chemistry Lab

    Compare the relative reaction rates of 1-bromobutane, 2-bromopropane, and 2-bromomethylpropane under SN1 reaction conditions. Silver nitrate will be used to provide nitrate ion as the nucleophile to produce alkyl nitrates as products. 1) I found the answer

    asked by Jesicca on October 14, 2014
  48. Chemistry

    the type of reaction in a voltaic cell is best described as 1.spontaneous oxidation reaction only 2.nonspontaneous oxidation reaction only 3.spontaneous oxidation-reduction reaction 4.nonspontaneous oxidation-reduction reaction i know its spontaneous, but

    asked by lisa on March 27, 2011
  49. HELPP CHEMM

    Heat of fusion of ice lab Initial mass of empty cup calorimeter 9.55g Initial mass of water 200.15g Initial mass of ice + water 209.7g Initial temp of water 41.9°C Initial mass of ice 26.9g Final mass of cup 9.55g Final mass of water 227.05g Final mass of

    asked by Anonymous on September 9, 2017
  50. Chemistry

    Write rate law expressions? 2NOCl(g) --> 2NO(g) + Cl2(g) S2O3^2-(aq) + H^+(aq) --> HSO3^-(aq) + S(s) (Sulfur initially forms a colloid solution so it can be treated as aqueous.) (1) Write the rate law expression for the above reactions, assuming these are

    asked by Donna on May 21, 2008
  51. chemistry

    I was having trouble with this problem. initial pressure for the compounds involved in the reaction displayed were determined to be P(CO(g)) = 0.5794 atm, P(H2O(g)) = 0.5662 atm, P(CO2(g)) = 0.7950 atm, P(H2(g)) = 0.2754 atm. Calculate the value of the

    asked by andy on April 8, 2010
  52. Chemistry

    A calorimeter, with calorimeter constant 7.31 J K–1, was used to measure the heat of reaction for mixing 100.0 mL of 0.100 M Ag+ with 100.0 mL of 0.100 M Cl–. The temperature change was +0.770 K for the 200.0 g of solution (specific heat capacity =

    asked by S on November 21, 2017
  53. Physics

    Two arrows are shot vertically upward. The second arrow is shot after the first one, but while the first is still on its way up. The initial speeds are such that both arrows reach their maximum heights at the same instant, although these heights are

    asked by Marissa on August 31, 2012
  54. physics

    Two arrows are shot vertically upward. The second arrow is shot after the first one, but while the first is still on its way up. The initial speeds are such that both arrows reach their maximum heights at the same instant, although these heights are

    asked by Anonymous on August 26, 2012
  55. physics

    Two arrows are shot vertically upward. The second arrow is shot after the first one, but while the first is still on its way up. The initial speeds are such that both arrows reach their maximum heights at the same instant, although these heights are

    asked by Tracie on September 5, 2012
  56. Chemistry

    At 573 K, gaseous NO2(g) decomposes, forming NO(g) and O2(g). If a vessel containing NO2(g) has an initial concentration of 1.9 × 10−2 mol/L, how long will it take for 75% of the NO2(g) to decompose? The decomposition of NO2(g) is second-order in the

    asked by Jim on September 23, 2015
  57. physics - stopping distance

    when a driver brings a car to a stop by breaki.g as hard as possible the stopping can be regarded as the sum of reaction distance and breaking distance. tje following data are given, v1 m/s contains 10,20,30. reaction distance are 7.5, 15, 22.5. the

    asked by gladys on April 25, 2013
  58. Chemistry

    Consider the following reaction between sulfur trioxide and water: SO3(g)+H2O(l)→H2SO4(aq) A chemist allows 61.5 g of SO3 and 11.2 g of H2O to react. When the reaction is finished, the chemist collects 51.0 g of H2SO4. Determine the percent yield for the

    asked by Anonymous on August 5, 2016
  59. chemistry

    A reaction starts with 1.00 mol each of PCl3 and Cl2 in a 1.00-L flask. When equilibrium is established at 250 degree Celsius in the reaction PCl3(g)+ Cl2(g)--> PCl5(g), the amount of PCl5 present is 0.82 mol. What is Kc for this reaction?

    asked by Shanice on October 26, 2010
  60. chemistry

    In the REDOX reaction in basic solution Zn-->Zn(OH)4+H2 I know that the first half reaction is 4H20+Zn-->Zn(OH)4 +4H+e but the second one is either 2e+2H2O--->H2+2OH (WHICH IS THE ANSWER GIVEN ON THE WORKSHEET) OR 2e+2H-->H2 I think both leads to the same

    asked by george on November 4, 2010
  61. Chemistry

    2 H2S (g) + SO2 (g) ƒnƒn3 S (s) + 2 H2O (g) 1) At 298 K, the standard enthalpy change, H¢X, for the reaction represented below is -145 kilojoules. (a) Predict the sign of the standard entropy change, S¢X, for the reaction. Explain the basis foryour

    asked by JJ on April 29, 2008
  62. chemistry

    Hydrogen gas (a potential future fuel) can be formed by the reaction of methane with water according to the following equation: CH4(g)+H2O(g) = CO(g) + 3H2(g) In a particular reaction, 26.5 L of methane gas (measured at a pressure of 736 torr and a

    asked by Lili on October 13, 2008
  63. physics

    A projectile, fired with unknown initial velocity, lands 18.4 s later on the side of a hill, 3290 m away horizontally and 409 m vertically above its starting point. (Ignore any effects due to air resistance.) (a) What is the vertical component of its

    asked by yelya on August 25, 2011
  64. Algebra

    The height, in meters, of a projectile can be modeled by h= -4.9t^2 + vt + s where t is the time (in seconds) the object has been in the air, v is the initial velocity (in meters per seconds) and s is the initial height (in meters). A soccer ball is kicked

    asked by Cooper on May 16, 2016
  65. Chemistry

    For the reaction given below, the frequency factor A is 8.7 multiplied by 1012 s-1 and the activation energy is 63 kJ/mol. NO(g) + O3(g) NO2(g) + O2(g) What is the rate constant for the reaction at 55°C?

    asked by Tanyo on February 20, 2012
  66. lee

    Which of these shows the correct balanced half-reaction for the following? The reaction takes place in acidic solution. C2O42–(aq) → CO2(g)

    asked by sad on November 5, 2014
  67. science

    in a certain chemical reaction, two reactants undergo change to form two products why cant you determine what type of reaction occurred from this information

    asked by lady t on April 29, 2010
  68. Chemistry

    Examine the redox reaction. As2O3(s) + Cl2(g) + H2O(l) → H3AsO4(aq) + HCl(aq) How many electrons are lost by each As atom during the reaction? A)4 B)3 C)2 D)1

    asked by Spencer on June 22, 2018
  69. Chemistry(Please check)

    If the reaction Cl2 (g) + O3 (g) = Cl2O (g) + O2 (g) occurred in just two steps, what would be the overall order of the reaction be? a. 1 b. 2 c. 3 d. 4 e. not possible to determine from the information given I chose 2 as the answer. Is this correct?

    asked by Hannah on February 29, 2012
  70. Science Help!

    Which of the following is true about photosythesis? A. It is an exothermic reaction B. It is an endothermic reaction C. It produces carbon dioxide D. It occurs in animals Is the answer C? Thank you

    asked by Callie on November 12, 2014
  71. Enthalpy

    Consider the following reaction: 2 Mg + O2 → 2 MgO ΔH rxn = -1203 kJ Calculate the amount of heat (in kJ) associated with complete reaction of 4 moles of Mg. How do I set this up correctly?

    asked by Chemistry on April 18, 2015
  72. Chemistry

    Given the reaction below, and your knowledge of the "Law of Conservation of Mass", what is the missing product from the chemical reaction? How do you know? Zn(s) + HCl(aq) --> ___ + ZnCl2(aq)

    asked by Delaney on January 5, 2017
  73. chemistry

    Consider the first order reaction A --> products where 25% of A disappears in 24 seconds. What is the half life of this reaction? ...i thought it would just be doubled but it isn't. i'd appreciate an explanation.

    asked by omar on April 29, 2010
  74. chemistry

    For the reaction A to products}, the following data were obtained: t=0 s, A}]=0.715 M; 22 s, 0.605 M; 74 s, 0.345 M; 132 s, 0.055 M. What is the half-life of the reaction?

    asked by joe on February 28, 2010
  75. Chemistry

    In a few concise sentences, explain how you could predict the products of a chemical reaction using the reaction between sodium nitrate and magnesium phosphate as an example?

    asked by Anonymous on January 13, 2016
  76. sofunda

    science chemistry..investigate the reaction of a number of elements and compound with water and classify the reaction as exothermic or endothermic.

    asked by ofentse on September 21, 2015
  77. Chemistry

    When acetone, C3H6O, is oxidized via combustion, the following reaction can be envisioned. Balance this reaction and determine the total of the coefficients when added together.

    asked by Anonymous on October 10, 2011
  78. Chemistry

    For the reaction given below, the frequency factor A is 8.7 multiplied by 1012 s-1 and the activation energy is 63 kJ/mol. NO(g) + O3(g) NO2(g) + O2(g) What is the rate constant for the reaction at 55°C?

    asked by Tanyo on February 20, 2012
  79. Chemistry

    Consider the reaction when aqueous solutions of manganese(II) sulfate and barium bromide are combined. The net ionic equation for this reaction is:???

    asked by Kristyn on November 4, 2012
  80. chemistry... please help!

    A mass of 11.6g of phosphoric acid was produced from the reaction of 10g of P4O10 with 12g of water. What was the percent yield for this reaction?

    asked by Kelly on October 5, 2009
  81. chemistry

    Represent this reaction with a balance chemical equation. Solid aluminium hydride is formed by a combination reaction of its two elements.

    asked by Shane on November 25, 2012
  82. Enthalypy Reaction

    What is the standard enthalpy of reaction for the following chemical reaction? CO2(g) + 2KOH(s) --> H2O(g) + K2CO3 (s) Express your answers numerically in kJ.

    asked by Sarah on September 23, 2008
  83. Chemistry

    The rate constant of a particular reaction is halved when the temperature is decreased from 323 K to 273 K. Calculate the activation energy for the reaction.

    asked by Lee on May 21, 2012
  84. chemistry

    The reaction below has an equilibrium constant of Kp=2.26×104 at 298 K. CO(g)+2H2(g)⇌CH3OH(g) Calculate Kp for the reaction below. 3CH3OH(g)⇌3CO(g)+6H2(g)

    asked by jessicaCC on March 18, 2015
  85. Chemistry

    How many grams of fluorine are needed to produce 120. g of phosphorus trifluoride if the reaction has a 78.1% yield from the following reaction: P4+6F2 -> 4PF3

    asked by Anonymous on January 10, 2012
  86. Chemistry1412

    The reaction below has an equilibrium constant of Kp=2.26×104 at 298 K. CO(g)+2H2(g)⇌CH3OH(g) Calculate Kp for the reaction below. 3CH3OH(g)⇌3CO(g)+6H2(g)

    asked by jessicaCC on March 18, 2015
  87. Chemistry

    A particular reaction has an activation energy of 51.6kJ/mol-rxn. How much faster is the reaction at 50 degrees C versus 25degrees C? I do not know how to start this!

    asked by Hannah on February 29, 2012
  88. chemistry

    For the reaction A to products}, the following data were obtained: t=0 s, A}]=0.715 M; 22 s, 0.605 M; 74 s, 0.345 M; 132 s, 0.055 M. What is the half-life of the reaction?

    asked by joe on February 28, 2010
  89. college

    For the reaction NO(g) + O3(g) „_ NO2(g) + O2(g) The frequency factor A is 8.7 X 1012 s-1 and the activation energy is 63kJ/mol. What is the rate constant for the reaction at 75 ¢XC?

    asked by Kelvin on May 14, 2009
  90. Chemistry

    In a few concise sentences, explain how you could predict the products of a chemical reaction using the reaction between sodium nitrate and magnesium phosphate as an example?

    asked by Anonymous on January 13, 2016
  91. chemistry

    For the following reaction in acidic solution. Cr2O7^2- + I- ---> Cr^3+ + IO3- give the balanced half reduction reaction. Indicate the oxidizing species.

    asked by Annie on June 17, 2013
  92. chemistry

    For the reaction A to products}, the following data were obtained: t=0 s, A}]=0.715 M; 22 s, 0.605 M; 74 s, 0.345 M; 132 s, 0.055 M. What is the half-life of the reaction?

    asked by joe on February 28, 2010
  93. science

    The primary source of energy in our solar sysem is from? a) fusion reaction on the sun b) fission reaction on the sun c) fission reaction on the earth d) fission and fusion in the galaxy e) fusion reactions in comets the answer i picked was a

    asked by babe on August 16, 2010
  94. Chemistry

    1. A combination reaction may also be a displacement reaction. True or False 2. The combustion of an element is always a combination reaction. True or False For number 1, I first thought true, but then again, nothing is being displaced in a combination

    asked by Jess on November 19, 2014
  95. 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.

    asked by Steve on September 20, 2014
  96. 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

    asked by Anonymous on January 26, 2012
  97. chemistry

    Calculate the temperature at which it is thermodynamically possible for C (s) to reduce iron(III) oxide by the reaction: 2Fe2O3 (s) + 3 C (s) ---> 4Fe (s) + 3CO2 I don't need a specific answer, but I'm not sure how to approach the problem. I'm assuming it

    asked by Janet on February 28, 2013
  98. physics

    calculate the range of the projectile using the initial speed and angle. use 9.8m/s. Initial speed 18m/s and the is 75 degrees. I came up with 8.29 is that right

    asked by Anonymous on January 23, 2011
  99. Health

    What is physical stress? A. A physical reaction to the heart to various triggers B. A physical reaction of the body to various triggers C. A physical reaction of the soul to various triggers D. A physical reaction of the mind to various triggers B

    asked by Night on October 30, 2014
  100. Chemistry

    For the reaction: 5A + 3B -> 6C + D, the following data is found: Time________A 0.00s .775 M 5.00s .200 M Find the rate of disappearance of A, the overall rate of reaction, and the reates of disapperance and appearance of B, C, and D. The answers I got

    asked by Aletha on February 21, 2007