1. physics

    Determine the stopping distances for a car with an initial speed of 93 km/h and human reaction time of 3.0 s for the following accelerations: -4.00 m/s^2 -8.00 m/s^2

    asked by Phil on August 19, 2011
  2. 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
  3. 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
  4. Chemistry

    If a procedure calls for 2mL of a concentrated nitric acid, what are the mass and moles of the HNO3 actually used in the reaction?

    asked by Dem on September 6, 2012
  5. chemistry

    For the following reaction, identify the substances oxidized, reduced and the oxidizing and reducing agents? 2SO2 + O2 --> 2SO3

    asked by mandy on October 30, 2013
  6. O-CHEM

    Formic acid is only readily soluble in water and in both 0.6 M NaHCO3 and 2.5 M NaOH. give a brief explanation of the reaction for each

    asked by Nina on February 4, 2009
  7. Chemistry

    Balance the following equation for a half reaction that occurs in acidic solution. Use e– as the symbol for an electron. Mo^3+ -> MoO2^2+

    asked by Anon on December 2, 2012
  8. Chemistry

    For the following reaction, identify the substance oxidized, reduced and the oxidizing and reducing agents. 2SO2 + O2 ----> 2SO3

    asked by Adam on October 30, 2013
  9. chemistry

    Which of the following is true for the gas phase reaction shown below? 4NH3(g) + 5O2(g) ¨ 4NO(g) + 6H2O(g), ƒ¢H = -0.905 kJ

    asked by cheryl on March 15, 2011
  10. chemistry

    14. The reaction H2S (aq) = HS-(aq)+ H+(aq) has pK = 7 at 298 K, 1bar. Consider a solution in which total dissolved sulfur is 10^-5 molal. At pH = 3, pH2S =

    asked by Anonymous on May 12, 2013
  11. Chemistry

    Write the net ionic equation for the precipitation reaction between ammonium sulfide and cadmium nitrate.

    asked by Bria on March 4, 2012
  12. physics

    Calculate the energy released in the fusion reaction 2 3 4 1 1 H + 1 H->2 H +0 n. The atomic mass of 3 1 H (tritium is 3.016049 u. I am lost! help please!

    asked by J on May 6, 2008
  13. Chem!!

    The value of ƒ¢H‹ 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 Harlem on June 6, 2012
  14. Chemistry

    How could you prove that sodium hydroxide is a base without using litmus papes to test? Give an equation for the reaction

    asked by Divine on September 18, 2014
  15. Chemistry

    A chemist ran the reaction and obtained 5.70 of ethyl butyrate. What was the percent yield? How do I solve this problem?

    asked by Nancy on December 6, 2011
  16. Chemistry

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

    asked by Kristy on March 10, 2012
  17. Chemistry

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

    asked by Tiara on May 4, 2016
  18. 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
  19. 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
  20. Physical Education help

    The body's reaction to information is to send these to the brain. A. Neurons B. Impulses C. Dendrites D. Synapse Is the answer B? Thank you

    asked by Anonymous on October 26, 2014
  21. Ochem Lab

    Suggest an appropriate reducing reagents for the following substrates and predict the reaction:(1) 2-hexanone, (2)ethyl 4-nitrobenzoate, (3) hexanal

    asked by sady on February 9, 2009
  22. chemistry

    Consider the reaction 3CH4(g)= C3H8(g)+ 2H2(g). Using data from Appendix C in the textbook, calculate delta G at 298 K.

    asked by Anonymous on February 14, 2012
  23. Chem Help Please!

    Give the full mechanism for the reaction of 1-bromo-3-methylpentane with methanol. I know you cant draw on here. but can you tell write it out with words? Thanks!

    asked by Kimberly on October 15, 2014
  24. Science HELP!

    The body's reaction to information is to send these to the brain. A. Neurons B. Impulses C. Dendrites D. Synapse Is the answer B? Thanks

    asked by Anonymous on October 26, 2014
  25. physics hw

    Determine the stopping distances for a car with an initial speed of 87 km/h and human reaction time of 2.0 s for the following accelerations. (a) a = -4.0 m/s2 (b) a = -8.0 m/s2

    asked by kylie on December 16, 2016
  26. Physical chemistry

    Ag(s) + Cl2(g) --> 2AgCl(s) ∆H and ∆S are 254.14kJ and –115.0J/K respectively. Calculate equilibrium constant, K for the reaction at 500K?

    asked by Alfred on August 8, 2011
  27. chemistry

    For the following reaction, identify the substances oxidized, reduced and the oxidizing and reducing agents? 2SO2 + O2 --> 2SO3

    asked by mandy on October 30, 2013
  28. 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
  29. 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
  30. chemestry

    The element oxidized in the reaction described in PbO2 + 4HCl → 2H2O + PbCl2 + Cl2 is A. Pb. B. O. C. H. D. Cl. would the answer be A? please explain

    asked by louren on March 17, 2016
  31. chemistry

    Given: Cr3+(aq) + 3e¨C  Cr(s); E¡ã = ¨C0.74 V Pb2+(aq) + 2e¨C  Pb(s); E¡ã = ¨C0.13 V What is the standard cell potential for the following reaction? 2Cr(s) + 3Pb2+(aq) ¡ú 3Pb(s) + 2Cr3+(aq)

    asked by Anonymous on May 3, 2010
  32. chemistry

    The rate constant for this first-order reaction is 0.0570 s–1 at 400 °C. A-->Products After how many seconds will 14.0% of the reactant remain?

    asked by k on March 23, 2012
  33. chemistry

    In the redox reaction: 4NH3(g)+3O2(g)-->2N2(g)+6H2O(l) the number of moles of electrons transferred is...

    asked by Metia on May 3, 2010
  34. 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
  35. Chemistry

    Enter the net ionic equation, including phases, for the reaction of AgNO3(aq) with BaO(aq). Is it... Ag+O2--->AgO?

    asked by Chelsea on October 13, 2013
  36. 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
  37. 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
  38. Chemistry

    For the following reaction, how many kJ of heat are produceed in forming 225.0 g of NO? 4 NH3 + 5 O2 → 4 NO + 6 H2O ΔHrxn = -906 kJ/mole

    asked by Morgan on July 6, 2016
  39. Thermodynamics (Chemistry)

    Ag(s) + Cl2(g) --> 2AgCl(s) ∆H and ∆S are 254.14kJ and –115.0J/K respectively. Calculate equilibrium constant, K for the reaction at 500K?

    asked by Alfred on August 8, 2011
  40. 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
  41. gen hem

    what is the free energy change in kJ for the reaction below? 2NO3-(aq)+8H+(aq)+3Hg(l) 2NO(g)+4H2O(l)+3Hg2+(aq) E0=0.106V

    asked by Chem on May 8, 2010
  42. gen chem

    what is the pK (=-logK)at 25C for the reaction below? Cl2(g)+6H2O(l)+5Cu2+(aq)2ClO3-(aq)+12H+(aq)+5Cu(s) E0=-1.133V

    asked by Chem on May 8, 2010
  43. chemistry

    In the reaction of sodium metal with oxygen gas, the formula of the product will be ______________. Periodic Table

    asked by jon on July 19, 2011
  44. ap chemistry

    Consider the reaction 2 Al2O3(s) ! 4 Al(s) + 3 O2(g) . H = +3339.6 kJ/mol What is the change in heat when 0.455 L of a 3.60 M Al solution reacts with excess O2 ?

    asked by cheri on October 31, 2012
  45. ap chemistry

    Consider the reaction 2 Al2O3(s) -> 4 Al(s) + 3 O2(g) . H = +3339.6 kJ/mol How much heat is generated when 0.455 L of a 3.60 M Al solution reacts with 1.05 mole O2 ?

    asked by cheri on October 31, 2012
  46. Chemistry

    What is the concentration of the Mg2 ion in solution when [CO3-2] = 0.25M given that the Ksp= 6.82 x 10-6 for the following reaction MgCO3-------->Mg +. CO32-

    asked by Monique on November 11, 2011
  47. Chemistry

    I have to write the rate law for two elementary reaction equations A ) 2a+b>c+d B ) X+Y>Z I'm pretty sure it's just k[ A ][ B ] and k[ X ][ Y ] but does the coefficient affect it in this case? is it [ A ]^2 ?

    asked by Dan on February 24, 2016
  48. 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
  49. 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
  50. Science

    Which reaction is exothermic? A. Cellular respiration B. Photosynthesis C. Baking soda + vinegar D. Melting Ice***

    asked by Ally on February 24, 2016
  51. chemistry

    what mass of salt can be produced from the reaction of 3.45 grams of sodium hydroxide and an excess of hydrochloric acid?

    asked by Alexis on April 27, 2010
  52. Chemistry

    Predict the product(s) and write a balanced equation for the following redox reaction: pentane (C5H12) + oxygen ---->

    asked by L on November 6, 2009
  53. 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
  54. 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
  55. Science

    How would you prove that sodium hydroxide is a base without using a litmus paper to test? Give the equation for the reaction?

    asked by Wissy on April 28, 2016
  56. chemistry

    Consider the following equation: CO + 2 H2 → CH3OH △H rxn = -128 kJ Calculate the amount of heat (in kJ) associated with complete reaction of 8.08 g H2. how would i set this up?

    asked by s. on June 13, 2017
  57. chemistry

    what is the relationship between reaction rate and shape of equilibrium graph in terms of concentration versus time?

    asked by sarah on April 18, 2010
  58. chemistry

    Determine how many milliliters of 0.255 M HClO4 will be required to neutralize 48.56 g Ca(OH)2 according to the reaction: 2HClO4(aq)+Ca(OH)2(s)=CA(ClO4)2(aq)+2H2O(l)

    asked by johnel on December 3, 2012
  59. Chemistry

    If 25.0 mLs of 0.150M nitric acid was used, how many grams of barium carbonate would be required for complete reaction?

    asked by Jessica on July 2, 2013
  60. Chemistry

    The rate constant for this first order reaction is 0.0470 s-1 at 400 C. A TO Products After how many seconds will 11.0% of the reactant remain?

    asked by Josh on July 16, 2011
  61. chemistry

    the following reaction is endothermic; 3O2(g) = 2O3(g) If this reation is at equilibrium will it shift to the right or left if we: 1) add some oxygen

    asked by Chris on March 30, 2011
  62. Organic Chemistry I

    You have isolated one of the isomeric dimethylcyclopentanes. on reaction it gives you 3 monochloroisomers, which of the possible pentanes is it? How do i do this? they don't give any choices, so how do i figure it out?

    asked by Nick on October 18, 2010
  63. Chemistry

    The rate constant for this first order reaction is 0.0470s-1 at 400 C. A to products After how many secs will 11.0% of the reactant remain?

    asked by Josh on July 19, 2011
  64. Chemistry

    How many grams of dichloromethane result from reaction of 2.62 kg of methane if the yield is 43.5 %? CH4+2Cl -> CH2Cl2+2HCl

    asked by Melia on November 5, 2012
  65. Chemistry

    I have to write the rate law for two elementary reaction equations A ) 2a+b>c+d B ) X+Y>Z I'm pretty sure it's just k[ A ][ B ] and k[ X ][ Y ] but does the coefficient affect it in this case? is it [ A ]^2 ?

    asked by Dan on February 24, 2016
  66. chemistry

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

    asked by Alexis A on October 29, 2013
  67. ap chemistry

    what is the galvanic cell for the redox reaction between sodium dichromate and mercury(I) nitrate in an acidic solution.

    asked by brian on October 16, 2010
  68. chemistry

    What physical property of water and HCl allows us to separate them from the zinc chlorine compound produced in the reaction?

    asked by wendy on February 5, 2015
  69. chemistry

    Please help again. How many grams of lithium are required to completely react with 70.7 mL of N2 gas at STP when given the following reaction: 6Li + N2 = 2Li3N

    asked by Lisa on December 4, 2011
  70. health care

    how are the processes of blood clotting, immune response, allergic reaction, and hormone release interrelated?

    asked by patti on April 7, 2009
  71. Chemistry

    The half-life (t1/2) of a first order reaction is 0.100 s. What is the rate constant? a. 6.93 s-1 b. 0.693 s-1 c. 0.0693 s-1 d. 0.144 s-1 e. 3.01 s-1

    asked by Shines on December 6, 2013
  72. organic chemistry

    What is the product of reaction of triphenylmethanol heated up with 40% HI in glacial acetic acid and then treated with sodium bisulfite?

    asked by Chris on November 17, 2010
  73. chemistry

    a. what is the effect on the Kc when the temperature of an exothermic reaction is lowered? b. according to Le Chatelier's principle, how is equilibrium in part a established.

    asked by Boo Boo on November 30, 2012
  74. chemistry

    How many grams of Mg(OH)2 would be produced from 4 mol KOH? if the balanced reaction is MgCl2 +2KOH arrow Mg(OH)2 + 2KCl?

    asked by barb on July 12, 2016
  75. Chemistry

    Formic acid is only readily soluble in water and in both 0.6 M NaHCO3 and 2.5 M NaOH. give a brief explanation of the reaction for each

    asked by Nina on February 4, 2009
  76. Chemistry

    Redox Reactions Can anyone help predict the reaction that will take place when Gold is put into a solution of Hydrochloric Acid?

    asked by Anonymous on March 1, 2008
  77. 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
  78. chemistry

    HOw many calories of heat were produced by the reaction of 10ml water with the powder of two compartments (2x3.23 g) of the heater?

    asked by diana on October 25, 2010
  79. 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
  80. 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
  81. chem

    How many grams of NH3 are required to make 52.7g H2O in the following reaction : 4NH3+6NO->5N2+6H2O

    asked by bob on September 29, 2013
  82. chemistry

    Write a reaction showing what happens to the following in water and identify te conjugate pairs. C6H5NH3 CO3_-2 HCOOh

    asked by Michael on May 19, 2009
  83. 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
  84. Chemistry

    In the following unbalanced reaction, which atom is oxidized? HNO3 + HBr -> NO + Br2 + H2O Is the answer bromine?

    asked by Anonymous on May 20, 2013
  85. Science

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

    asked by Raghav on June 21, 2016
  86. chemistry

    At what temperature will the following reaction happen spontaneously, given that ΔH=8.91×103J and ΔS= –219.20 J/K? CaSO4(s) + 2HCl(g) → CaCl2(s) + H2SO4(l)

    asked by Rosi on October 29, 2014
  87. 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
  88. 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
  89. 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
  90. 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
  91. 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
  92. 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
  93. 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
  94. 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
  95. 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
  96. 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
  97. 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
  98. 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
  99. 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
  100. 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