1. Chemistry

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

    asked by Fouzia on March 29, 2017
  2. 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!

    asked by Wendy on April 24, 2012
  3. chem

    4Fe(s) + 3O2(g) → 2Fe2O3(s) Identify the type of chemical reaction represented by this equation. is it redox?

    asked by Anonymous on April 21, 2009
  4. Chemistry

    How many liters of hydrogen at STP can be produced by the reaction of 4.15 g of zinc with hydrochloric acid: Zn + 2HCl -> ZnCl2 + H2

    asked by Christina on November 9, 2009
  5. Chemistry

    How much work (in J) is involved in a chemical reaction if the volume decreases from 5.00 to 1.26 L against a constant pressure of 0.857 atm?

    asked by Dorian on February 23, 2018
  6. Chemistry

    How many liters of hydrogen at STP can be produced by the reaction of 4.15 g of zinc with hydrochloric acid: Zn + 2HCl -> ZnCl2 + H2

    asked by Julie on November 9, 2009
  7. Chemistry

    What would the reaction of these two look like (reactants and products) A) hexanal is reduced B) Butanoic acid is neutralized by potassium hydroxide

    asked by Rose on May 27, 2016
  8. 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?

    asked by Anonymous on November 9, 2014
  9. chemistry

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

    asked by Doss on October 26, 2011
  10. CHEMISTRY

    In half reaction method of the chemical equation balancing , how about those redox reactions that they don't contain any (H) and ( O ) atoms ?

    asked by MAD on July 8, 2014
  11. Chemistry

    Complete and balance the precipitation reaction. Include physical states in your answer. CuCI2(aq)+Na2CO3(aq)

    asked by Tiara on May 4, 2016
  12. Science

    Which statement best summarizes the world’s reaction to stratospheric ozone depletion discussed in Chapter 7.4 of your text?

    asked by 100 % on March 4, 2014
  13. PHYSICS

    What is the reaction effect of the following action effects? a) Earth orbits the sun b) Ball accelerates downward Thank YOu.

    asked by JJ on November 21, 2010
  14. science

    why did the balance record a decrease in mass during the reaction betwwn iron sulphide and hydrochloric acid?

    asked by candice on August 22, 2010
  15. Half-Life

    The rate constant for this first-order reaction is 0.0990 s–1 at 400 °C. A --> products After how many seconds will 10.0% of the reactant remain?

    asked by Sam on September 22, 2015
  16. Chemistry(please check my answer)

    Which of the following is an oxidation reaction? A. AuCl4- → AuCl 2- **** B. Mn7+ → Mn2+ C. Cl2 → ClO3- D. Co3+ → Co2+

    asked by Cherry on September 1, 2016
  17. PHYSICS

    What is the reaction effect of the following action effects? a) Earth orbits the sun b) Ball accelerates downward Thank YOu.

    asked by JJ on November 21, 2010
  18. chemistry

    if a reaction vessel contains 11.5g NH3, 12.0g O2, and 10.5g CH4, what is the maximum mass in grams of hydrogen cyanide that could be made?

    asked by robert on October 13, 2012
  19. Chemistry

    What amount of ammonium sulfate is produced by the reaction of 8.48g of ammonia with 24.50g sulfuric acid?

    asked by benji on May 5, 2016
  20. Chemistry

    Write the balanced equation for the double replacement reaction of: Barium chloride and Sulfuric acid

    asked by Kristy on March 10, 2012
  21. Science

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

    asked by Raghav on June 21, 2016
  22. College Chemistry

    Calculate the heat of formation reaction for SiO2(s)+4HF(g) --> SiF4(g)+2H2O(l) I got -129.6 and it says I'm wrong

    asked by Kaylene on March 1, 2010
  23. Chemistry

    What is the minimum amount of 5.9M H2SO4 necessary to produce 27.7g of H2 (g) according to the following reaction? 2Al(s)+3H2SO4(aq)→Al2(SO4)3(aq)+3H2(g)

    asked by Jill on March 6, 2014
  24. chemistry

    Silver is electroplated at the cathode of an electrolysis cell by 1/2 reaction Ag(aq) + e- --> Ag(s). How many moles of electrons are required to electroplate 5.8g of Ag?

    asked by Ashley on November 30, 2011
  25. Please help needed urgent

    N2 (g) + 3H2 (g) → 2NH3(g) ΔH = -92.2 kJ What mass of ammonia is theoretically produced if the above reaction released 168 kJ of heat?

    asked by Please Help on October 15, 2017
  26. Chemistry for Bob

    Do you mind posting up an example for that please? It would help out a out: What is the activation energy for a reaction whose rate tripled when temperature rose from 28 to 53C.

    asked by Jeena on March 15, 2010
  27. College Chemistry

    what is the maximum weight of CuCl that can be prepared from the reaction sequence using 1.0g of Cu turnings to prepare the Cu2+ solution?

    asked by Maggie on October 7, 2010
  28. chemistry

    Consider the following chemical reaction: 2H2O2(L) ¨ 2H2O(L) + O2(g) ƒ¢Hrxn = -196.1 kJ How much heat is released if 2 moles of O2 are produced?

    asked by peterson on March 9, 2014
  29. Chemistry

    What mass of calcium carbonate reaction with hydrochloric acid yields 44L of the gas at 27 ° C and 1520 mm Hg?

    asked by Nadia on January 26, 2016
  30. Chemistry

    if the pressure was increased in this reaction : 2NO(g)+ O2 =====> 2NO2

    asked by Happy Camper on March 27, 2007
  31. Chem H

    How do you write a balanced net ionic equation for the reaction Cr2(SO4)3(aq)+(NH4)2(CO3)(aq)?

    asked by Sonia on December 13, 2010
  32. chemistry

    4NH3(g)+5O2(g) yield 4NO(g)+6H2O(g) Deduce the equilibrium constant expression for the reaction.

    asked by John on April 27, 2012
  33. Chemistry

    If a reaction quotient is undefined, and the Kc = 1. A+B=>C A=0m, B=0m, C=10m What happens to the concentrations of A,B,C? do they decrease or increase or no change to reach equil?

    asked by Jenny on February 9, 2011
  34. Physical Science

    What are the products of a double replacement reaction between potassium bromide and silver nitrate? Name the resulting compounds.

    asked by Leon on March 14, 2017
  35. chemistry

    what is the volume in liters in H2gas produced at 24 degree celsius and 835 mmhg from the reaction of 12g of many thanks

    asked by patricia on May 2, 2013
  36. Chemistry

    What are the other two independent other than concentration for reaction of hydrochloric acid with calcium carbonates. And what are thier control variable?

    asked by Zee on September 16, 2016
  37. Chemistry

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

    asked by Ashley on October 10, 2011
  38. chemistry

    The basicity of tetraoxosulphate(6) is 2. explain this statement with an equation showing the reaction between the acid and potassium hydroxide

    asked by Ayibadenyifa on May 9, 2016
  39. chemistry

    The dH for the reaction below is -482 kJ. Calculate the heat (kJ) released to the surroundings when 12.0 g of CO (g) reacts completely. 2CO(g) + O2(g) --> 2CO2(g)

    asked by tank on April 16, 2012
  40. Chemistry

    If 0.120 moles of water are produced in the reaction H+(aq)+OH-(aq)=H2O deltaH=-56.2kj/mol what is qrxn

    asked by Nick on October 24, 2011
  41. Chemistry

    Possible Sources of error in a reaction or sodium bicarbonate and acetic acid. Also known as baking soda and vinegar.

    asked by Grace on February 25, 2014
  42. pmdc

    Calculate the mass of Mg metal required to consume 2560g of CO2 in the reaction. 2Mg+CO2_2MgO+C

    asked by Asad khan on August 28, 2014
  43. Chemistry

    Write the equation for the reaction by which aspririn decomposes in an aqueous ethanol solution. C9H8O4 + C2H6 --> ?

    asked by Sara on April 20, 2008
  44. Chem 11

    How many grams of O2 are required to produce 255grams of SO2 in following reaction? 4FeS2+11O2===> 2Fe2O3+8SO2

    asked by Emmy on October 20, 2010
  45. SCIENCE

    CAN WE USE A COPPPER VESSEL FOR STORING 1 MOLAR AgNO3 SOLUTION? IF NO JUSTIFY BY GIVING CHEMICAL REACTION BETWEEN THEM

    asked by DEEPTHY on November 9, 2014
  46. 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?

    asked by BLAH on May 10, 2016
  47. chemistry kinetics

    The rate constant is numerically the same for three reactions of first ,second and third order resp. Which reaction should be the fastest and is this for all ranges of concentrations ??

    asked by Gagan on July 12, 2017
  48. chemistry

    If 2.00g of Zn is allowed to react with 1.75g of CuSO4, how many grams of Zn wil remain after the reaction is complete?

    asked by Jackie on December 13, 2010
  49. Philosophy Intro to Logic

    I have to write an argument in standard form before writing an essay on it. I'm using an article written by Jenny Price on news.wisc titled "Facebook profiles raise users' self-esteem and affect behavior" And here's what I have for the standard form, I

    asked by Nicole on October 26, 2014
  50. Science

    Check my answers, please. 1. A prion is an infectious, self-reproducing protein structure. (1 point) True X False 2. As one organism eats another, toxins can be spread throughout the food chain. True False X 3. The problem with DDT in the environment is

    asked by Steve on October 10, 2017
  51. 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

    asked by Nicole on October 16, 2006
  52. math !

    1)You roll a 6-sided number cube twice. Find P(3, then even). Write the probability as a fraction in simplest form. 2)Sasha visits the ice cream parlor and asks the server to randomly choose her bowl color, ice cream flavor, and topping for her. Use the

    asked by Q&J Wiiffeyy on May 19, 2016
  53. Chemistry

    1. Molarity is to moles of solute over liters of solution as molality is to A. molar concentration over molal concentration. B. moles of solute over kilograms of solvent. C. molal concentration over molar concentration. D. moles of solute over moles of

    asked by Anonymous on September 26, 2011
  54. Reading

    I still don't understand the difference between the plot and summary. Let me see if I am right. If a project said to write about the plot could you put it in bullet format and name off major events in order. And if it asked to write the summary of the book

    asked by Katie on December 20, 2006
  55. possessive nouns

    Write the noun in this sentence so it shows possession. The bus driver is named Mr. Ed. Would it be? The bus's driver is named Mr. Ed. I personally think the sentence should be rewritten to read, The bus driver's name is Mr. Ed The second sentence is

    asked by Lulu on December 12, 2006
  56. Math Please Check My Answer

    A box contains 95 pink rubber bands and 90 brown rubber bands. You select a rubber band at random from the box. Find each probability. Write the probability as a fraction in simplest form. a. Find the theoretical probability of selecting a pink rubber

    asked by OceanBreeze on May 7, 2015
  57. Algebra 1 (maths)

    I'm slightly confused about this question: Suppose that you memorize a list of 100 German vocabulary words. Each week you forget 1/8 of the words you knew the previous week. The number of vocabulary words (V) that you remember after t weeks can be modeled

    asked by Squid on April 17, 2012
  58. 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

    asked by Mika on April 6, 2014
  59. computer

    You can only work with graphics within Paint; you cannot insert text. True False False? If you want your text to be centered on each line in a Word document, then you need to use __________. left alignment center alignment right alignment justified

    asked by Bri on June 7, 2018
  60. Algebra

    10. Write an equation in point-slope form for the line through the given point with the given slope. (5, 2); m=3 a. y+2=3(x-5) *** b. y+2=3x-5 c. y-2=3(x+5) d.y-2=3(x-5) 11. Write an equation in point-slope form for the line through the given point with

    asked by bleh on December 19, 2016
  61. 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

    asked by Anonymous on July 11, 2016
  62. 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

    asked by Anonymous on July 11, 2016
  63. 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

    asked by Anna-Marie on October 28, 2008
  64. algebra

    find the y-intercept and the slope x + 2y -3 =0 You first have to get this into slope-intercept form: 2y=-x+3 y=-0.5x+1.5 This form is y=mx+b, where m is the slope and b is the y-intercept.

    asked by dee on January 24, 2007
  65. Chemistry Problem

    A student proposes to use visible spectroscopy to measure the kinetics of the permanganate/oxalic acid reaction. The initial permanganate solution was very dark. For a 1 cm sample cell, the absorbance A = 2,500[MnO4]. As a practical rule of thumb, Beer's

    asked by Amy on January 22, 2013
  66. Chemistry- Dr.Bob!

    Combustion of natural gas (primarily methane) occurs in most household heaters. The heat given off in this reaction is used to raise the temperature of the air in the house. Assuming that all the energy given off in the reaction goes to heating up only the

    asked by Lana on January 14, 2016
  67. Chemistry

    Combustion of natural gas (primarily methane) occurs in most household heaters. The heat given off in this reaction is used to raise the temperature of the air in the house. Assuming that all the energy given off in the reaction goes to heating up only the

    asked by Lana on January 13, 2016
  68. math 4

    at the 6th grade school dance, there are 132 boys, 89 girls, and 14 adults. A. write a ratio of number of boys to girls. b. write the same ration using another form (A:B vs A to B) c. write the ratio of number of boys to number of adults. d. write the same

    asked by Rem on September 10, 2013
  69. Physics

    A small fish is inside a spherical bowl filled with water (n=1.33). The bowl has a diameter of 30cm and the fish is at a distance of 5cm from the surface that separates water and air (ignore the effects of the glass of the bowl). The image of the fish is

    asked by Sandra on March 27, 2010
  70. Physics

    A small fish is inside a spherical bowl filled with water (n=1.33). The bowl has a diameter of 30cm and the fish is at a distance of 5cm from the surface that separates water and air (ignore the effects of the glass of the bowl). The image of the fish is

    asked by mm on March 27, 2010
  71. Biology/Chemistry

    What kind of isomers can amino acids form? Which isomer is present in most living organisms? don't major compounds of living organisms consist of modifications of hydrocarbons Although D amino acids can be found in nature, only the L isomers are used to

    asked by Raj on February 22, 2007
  72. Chem.....

    Methanol, CH3OH, is produced on an industrial scale from carbon monoxide and hydrogen. At the temperatures used, gaseous methanol is formed according to the following thermochemical equation: CO(g)+ 2H2(g) CH3OH(g) H = -90Kj 1. State Le Chateliers

    asked by Jon on March 4, 2007
  73. Chemistry

    How can you increase the concentration of the product (s) in each of these reactions by varying the temperature and pressure (caused by volume change)? 4NH3 + 5O2 4NO + H2O Delta H = -903.75 kJ Br2 + Cl 2BrCl Delta H = 14.64 kJ Please help... With gaseous

    asked by Linda on May 2, 2007
  74. psychology

    Ryan,an avid football enthusiast,and his mother,who is much less familiar with the game are watching their favorite college team attempt to scoreWhich of the following conclusions is most likely? a)The positons of the players form 11 chunks in both Ryan's

    asked by vedrana on October 20, 2009
  75. psychology

    Ryan,an avoid football enthusiast,and his mother,who is much less familiar with the game are watching their favorite college team attempt to scoreWhich of the following conclusions is most likely? a)The positons of the players form 11 chunks in both Ryan's

    asked by vedrana on October 20, 2009
  76. Chemistry

    A plasma reaction converts A (Molecular weight = 200) to B and uses NAD as a co-substrate and produces NADH as a by product (1 mole of NADH is produced per every 1 mole of A converted to B). The amount of NADH can be determined by monitoring its’

    asked by Sophia on December 14, 2016
  77. chemistry/check please

    1) Oxygen and boron are in the same period . When they form a compound----- is written first.Phosphorus and arsenic are the same group. When they form a compound------is written first. A) oxygen/phosphorus B)oxygen/arsenic C)boron/phosphorus

    asked by nick on February 12, 2012
  78. chemistry/help

    1) Oxygen and boron are in the same period . When they form a compound----- is written first.Phosphorus and arsenic are the same group. When they form a compound------is written first. A) oxygen/phosphorus B)oxygen/arsenic C)boron/phosphorus

    asked by nick on February 12, 2012
  79. English (Check)

    For each noun listed, write one sentence using the singular possessive form and another using the plural possessive form. 1. passenger Singular Possessive: The passenger's seat was uncomfortable during the entire flight. Plural Possessive: The passengers'

    asked by Victoria on February 21, 2016
  80. 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

    asked by Laura on February 23, 2009
  81. Chemistry

    Given 2Al2O3 (s) --> 4Al(s) + 3O2 (g) (standard enthalpy change= 3351.4 kJ) a) What is the heat of formation of aluminum oxide? How do I find heat of formation from standard enthalpy change? I know how to do it when I'm given enthalpy, but they aren't the

    asked by Chris on February 1, 2007
  82. Chemistry(Please check!!)

    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 complete or

    asked by Hannah on September 24, 2011
  83. 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 complete or

    asked by Hannah on September 25, 2011
  84. Algebra 2

    Write a polynomial function in standard form with the given zeros: x=2,-2,4

    asked by Alex on January 7, 2013
  85. arithmetic

    what is 11/4,4/7 and 10/21 in the simplest form i tried adding divide not coming with the right answer

    asked by james on March 4, 2010
  86. 4th grade

    how do i write about Air transportation in a project form i cant seems to find nothing.

    asked by charissa on February 25, 2009
  87. Geometry

    What is an equation in point-slope form for the line perpendicular to y=2x+13 that contains (8,-4)?

    asked by Sierra on March 9, 2014
  88. Math (pls help)

    write the number in expanded form. 1) 46,182 2) 20, 397

    asked by Anne on September 5, 2009
  89. Science

    What is the process through which mid-ocean ridges (rifts) normally form?

    asked by Angie on February 24, 2009
  90. Algebra Readiness

    1) Write the ration in simplest form 50:10 A)25:2 B)10:2 C)5:1 D)1:5 2) Solve the following proportion. r/5=9/21

    asked by SomeOneUnTraceable on January 22, 2018
  91. SCIENCE

    Why do atoms combine to form compounds? Because it would create stablity. Thank you

    asked by jayjay on August 14, 2007
  92. Math

    write the equation in slope intercept form 6x+3y=12 i got y=2x+4 but i don't think i am right please HELP!!!

    asked by kelly on April 13, 2011
  93. chemistry

    the form of the conversion factor that is used is the one in which the unit of the_ is in the denominator

    asked by rabah on March 15, 2010
  94. College Chemistry

    explain why krypton can form compounds with other elements, but neon cannot

    asked by Jim on April 26, 2010
  95. Algebra Help

    Form a Polynomial f(x) Degree: 4, Zeros: 2+2i;-5, Multiplicity:2 f(x)=a(______________)

    asked by Anonymous on October 18, 2014
  96. Pre calculus

    P=(-2,2) Q=(3,4) S=(2,-8) PS-3PQ Find the component form and magnitude of the vector.

    asked by Luis on April 4, 2014
  97. science

    what properties of carbon explain its ability to form many macromolecules?

    asked by hannah on December 16, 2010
  98. algebra 209

    write the following in simplified radical form 3 sqrt 250

    asked by Anonymous on January 17, 2011
  99. Math-Correct Please

    Did I do this problem right? Rewrite the equation in slope-intercept form. y+4=5(x+2) y=5x+6

    asked by Emma on November 16, 2012
  100. precalculus

    write the system of equations in row-echelon form 2x+4y+z=-4 2x-4y+6z=13 4x-2y+z=6

    asked by Anonymous on November 30, 2016