1. Chemistry

    1.What hydrocarbons generally will undergo an immediate reaction with Br? 2.What hydrocarbons generally will undergo an immediate reaction with KMnO4 Choices for both are Alcohols,Alkanes, Alkenes, Aromatics I think for 1. is at least Alkenes and maybe

    asked by Anonymous on July 27, 2010
  2. Chemistry

    According to the following reaction, how many grams of nitrogen gas will be formed upon the complete reaction of 22.2 grams of hydrogen gas with excess nitrogen monoxide? nitrogen monoxide (g) + hydrogen (g) nitrogen (g) + water (l)

    asked by Kaitlin on October 16, 2012
  3. Chemistry

    1.What hydrocarbons generally will undergo an immediate reaction with Br? 2.What hydrocarbons generally will undergo an immediate reaction with KMnO4 Choices for both are Alcohols,Alkanes, Alkenes, Aromatics I think for 1. is at least Alkenes and maybe

    asked by Anonymous on July 27, 2010
  4. chemistry

    According to the following reaction, how many grams of sulfur trioxide will be formed upon the complete reaction of 21.2 grams of oxygen gas with excess sulfur dioxide? sulfur dioxide (g) + oxygen (g) sulfur trioxide (g)

    asked by nik on October 24, 2010
  5. Chemistry

    Acetic acid is a polar molecule and can form hydrogen bonds with water molecules. Therefore, it has high solubility in water. Yet acetic acid is also soluble in benzene (C6H6), a nonpolar solvent that lacks the ability to form hydrogen bonds. A solution of

    asked by James on February 17, 2012
  6. history

    Which best describes a democracy? form of government in which political power is held by a single ruler form of government in which political power is held by the people government based on appointing officials according to merit and academic

    asked by Kira on September 29, 2017
  7. Spanish

    How would you conjugate the verb "decir" which means to say, to the "yo" form? Would it be digo? Or dico? Please help! Thank you for using the Jiskha Homework Help Forum. The verb "decir" is irregular in the "yo" form of the Present Indicative Tense: digo,

    asked by Tavia on March 6, 2007
  8. Chemistry

    Please check to see if I got these right and specifically for #2, I am not sure if I have this balanced correctly. Write the complete balanced equations for the following: 1) Potassium metal reacts with oxygen gas to form solid potassium oxide. My answer:

    asked by Ashley on August 4, 2010
  9. Chemistry

    Acid-Base Titrations These are fill in the blank and I really am not sure what the answers are 1. Indicators change color over a range that is called its ---? 2. The common indicator ---? is very useful in studying neutralizations that involve strong acids

    asked by Lauren on December 17, 2017
  10. chemistry

    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 is produced

    asked by Katie Y. on November 2, 2009
  11. science

    why does limestone form often in dry climates but rarely in wet climates? http://en.wikipedia.org/wiki/Limestone Why does limestone often form cliffs in dry climates rather than wet climates. i don't know

    asked by Think Critically on January 17, 2007
  12. Chemistry(please help)

    I have to calculate the concentration of I2 produced (# of moles of I2 produced / L) based on the stoichiometric ratio in the following equation. 2S2O3^2- + I2 -> 2I^- + S4O6^2- So I got 6.6e-3 L*min for the amount of I2 produced. Now I have to calculate

    asked by Hannah on February 28, 2012
  13. Science

    (1)A geologist was studying rocks in a mountain range. She found a layer of sedimentary rock that had formed in the ocean. Hypothesize how this could happen. My (Answer) Sedimentary rocks forms when sediments have been pressed or cemented together , or

    asked by Raven on September 26, 2012
  14. Chem

    First off, thanks for the help on the other problems... For the reaction, A(g) + 2 B(g) 2 C(g), Kc = 1 x 10-10 at 25°C. Which of the following statements is true? 1. Delta n = +1 2. The concentration of the products is greater than the concentration of

    asked by Marisol on February 9, 2007
  15. chemistry

    Which factors below affect the rate of a chemical reaction? -Collision frequency -Number of collisions having the least activation energy -Intermolecular orientation -Being Exothermic or Endothermic Also, what formula would I use for this problem: "What is

    asked by anonymous on April 29, 2007
  16. math,correction

    Can someone correct these for me please... Multiply. (x+2)(x-2) My answer..x^2-4 Write in descending-exponent form, and give the degree 4x^5+x^8-7 My answer: In descending-exponent form would be: x^8+4x^5-7, The degree is 8 Multiply. 3xy^2(5xy-4x+6y) My

    asked by jas20 on February 28, 2007
  17. chemsitry

    A sample consisting of 0.025 mol of a solid compound is placed inside a metal cylinder. The cylinder was immersed in a water bath consisting of 10.00 kg of water at an original temperature of 25.00 °C. When the compound decomposes, the temperature of the

    asked by Nora on October 23, 2010
  18. CHEM-last part prob.

    Aluminum reacts with chlorine gas to form aluminum chloride via the following reaction: 2Al(s) + 3Cl2(g) -> 2AlCl3(s) You are given 19.0g of aluminum and 24.0g of chlorine gas. a)If you had excess chlorine, how many moles of of aluminum chloride could be

    asked by K on October 16, 2007
  19. Physics

    For a L-C-R circuit Vin = v0*expjwt. Vout is taken across R a) Calculate the impedance of the circuit measured from the input side. Express the impedance in polar form. b) Calculate the gain=Vout/Vin and express the ratio in polar form. c) Sketch the

    asked by Sandhya on March 29, 2008
  20. Chemistry

    A middle-aged man has been diagnosed as being at high-risk of developing Coronary Artery Disease. •State the chemical composition of the sterol that is present in high levels in most people who belong to the high-risk group. •Distinguish between the

    asked by sally on August 5, 2011
  21. Chem

    middle-aged man has been diagnosed as being at high-risk of developing Coronary Artery Disease. •State the chemical composition of the sterol that is present in high levels in most people who belong to the high-risk group. •Distinguish between the

    asked by Anonymous on November 3, 2011
  22. chemistry

    A middle-aged man has been diagnosed as being at high-risk of developing Coronary Artery Disease. * State the chemical composition of the sterol that is present in high levels in most people who belong to the high-risk group. * Distinguish between the

    asked by lue on April 8, 2011
  23. Chemistry

    A middle-aged man has been diagnosed as being at high-risk of developing Coronary Artery Disease. • State the chemical composition of the sterol that is present in high levels in most people who belong to the high-risk group. • Distinguish between the

    asked by Marlene on March 30, 2010
  24. SS

    How is unity and division a theme in Canadian history? How did distinct English and French populations form in Canada? What is the relationship between natural resources and European settlement? How is conflict and compromise a theme in Canadian history?

    asked by Leila on September 17, 2016
  25. chemistry

    A 40-year old man, at a prominent legal firm experiences abdominal pain post lunch. He takes several trips to the restroom, but continues to experience pain and cramps. He decides to go to the doctor and admits he consumed 2 bottles of beer @ lunch. The

    asked by Sara on February 5, 2012
  26. Chem

    I have a few questions, if anyone can help me at all it would be amazing. i need this done by TOMORROW (03/03/2008) 1. Cyanogen has been observed in the atmopshere of Titan, Saturn's largest Moon, and in the gases of the interstellular nebulas. On Earth,

    asked by T on March 2, 2008
  27. Chemistry

    I have a few questions, if anyone can help me at all it would be amazing. i need this done by TOMORROW (03/03/2008) 1. Cyanogen has been observed in the atmopshere of Titan, Saturn's largest Moon, and in the gases of the interstellular nebulas. On Earth,

    asked by T on March 2, 2008
  28. Chemistry

    For the following reaction, 9.91 grams of sulfur are allowed to react with 20.8 grams of carbon monoxide . sulfur(s) + carbon monoxide(g) sulfur dioxide(g) + carbon(s) is the maximum amount of sulfur dioxide that can be formed? What is the FORMULA for the

    asked by Julian on September 29, 2015
  29. Chmistry

    For the following reaction, 4.35 grams of hydrogen gas are allowed to react with with 10.3 grams of ethylene (C2H4). hydrogen (g) + ethylene (C2H4) (g) ethane (C2H6) (g) What is the maximum amount of ethane (C2H6) that can be formed? grams What is the

    asked by Austin Jekins on December 4, 2010
  30. Algebra, PLEASE HELP ME!!!

    I am so lost, can anyone help me? I don't even understand what the teacher wants out of me with this problem. Suppose that a market research company finds that at a price of p = $20, they would sell x = 42 tiles each month. If they lower the price to p =

    asked by Laura on September 1, 2008
  31. math

    a. Suppose a market research company finds that at a price of p = $30, they would sell x = 32 baskets each month. If they lower the price to p = $10, then more people would purchase the baskets, and they can expect to sell x = 52 baskets in a month’s

    asked by kim on January 15, 2012
  32. Chemistry

    A 40-year-old manager, at a prominent legal firm in L.A., experiences abdominal pain post lunch. He goes to the restroom a couple of times, but continues to experience pain and cramps. He eventually decides to get himself examined. While questioning him,

    asked by Marlene on March 30, 2010
  33. chemistry 101

    Consider the following reaction. CaO (s) + CO2 (g) = CaCO3 (s) A chemist allows 14.4 g of CaO and 13.8 g of CO2 to react. When the reaction is finished, the chemist collects 19.4 g of CaCO3. Determine the limiting reactant, theoretical yield, and percent

    asked by ABCD on July 8, 2011
  34. precalc

    1. Find (-1+i)^1/3 2. Express 2(cos5pi/3 + isin5pi/3) in regular form. would this be correct: 1-√3i? 3. Find (2+4i)^3 in regular form. 4. Express 5(cos5pi/6 + isin5pi/6) in regular form. would this be correct?: -5√3/2 +5/2i?

    asked by 95 on December 7, 2011
  35. FRENCH! HELP!

    so i have this french test tomorrow on imparitive, and subjonctif. i have had a lot of trouble remembering them, and telling them apart. can anyone help!? that would be fantastic! thank you so much! its urgent! Imperative (note spelling) means giving a

    asked by leah on December 20, 2006
  36. physics

    A car is traveling at a constant velocity of 21 m/s (about 45 mph). The driver sees a fallen tree lying across the road and hits the brakes after a delay (reaction time) of 245 ms. (1 ms = 10-3 s.) Calculate the distance the car travels during this 245 ms

    asked by rosy on September 23, 2015
  37. English

    I urgently need you to check these sentences. Thank you. 1) As our students we'll probably have to learn science in English in their last year of high school, we would rather they used English as the lingua franca for their Comenius project. 2) I think

    asked by Henry2 on November 18, 2011
  38. history

    C/C between american slavery and encomienda system. The encomienda system was a form of land ownership set up after 1492 to divide both the lands and peoples of the New World into workable pieces that were run by Spanish settlers. This system was abused.

    asked by veronica on August 26, 2009
  39. Chemistry

    You are instructed to create 500. mL of a 0.25 M phosphate buffer with a pH of 7.7. You have phosphoric acid and the sodium salts NaH2PO4, Na2HPO4, and Na3PO4 available. (Enter all numerical answers to three significant figures.) H3PO4(s) + H2O(l)

    asked by Sarah on March 6, 2019
  40. Chemistry

    Hi I have two questions and I was hoping someone could help me with them. 1. Classify the following compounds as ionic or covalent a. MgCl2 b. Na2S c. H2O d. H2S 2. Which compound in each pair exhibits the stronger intermolecular hydrogen bonding? a. H2S

    asked by Alekya on August 2, 2007
  41. Chemistry

    Does sodium metal react with potassium hydroxide solution? No. It would be a displacement reaction and this only works if the metal is higher in the activity series than the one it wants to displace. Given that potassium is the highest ranked metal (sodium

    asked by Fiona on July 28, 2007
  42. Spanish!!!!!! Can Anyone Help Please!!

    Which one would be correct: La semana pasada ellos me DIERON dinero. Or La semana pasada ellos me DI dinero. There's me so i don't know if it should be dar in the yo form or the they form for ellos.

    asked by Amy~ on May 26, 2010
  43. AP CHEMISTRY

    The following acid-base indicators are available to follow the titration. Which of them would be most appropriate for signaling the endpoint of the titration? EXPLAIN ------- COLOR CHANGE ------ INDICATOR Acid form Base Form pH Transition Interval

    asked by HELP PLEASE on March 8, 2012
  44. AP CHEMISTRY

    The following acid-base indicators are available to follow the titration. Which of them would be most appropriate for signaling the endpoint of the titration? EXPLAIN ------- COLOR CHANGE ------ INDICATOR Acid form Base Form pH Transition Interval

    asked by HELP PLEASE on March 8, 2012
  45. math

    A model rocket is shot straight up into the air. The table shows its height, h(t), at time t. Graph the table below and determine a function, in standard form, that estimates the height of the rocket at any given time. Time(s) Height (m) 0 0.0 1 25.1 2

    asked by Genny on March 26, 2015
  46. English

    1. He spent much money on clothes. 2. He spent too much money in buying books. 3. He spends lots of money traveling to many countries. 4. He spends plenty of time watching TV. 5. He spent a lot of time in buying items in the department store. Are all

    asked by John on June 30, 2008
  47. Chemistry: check answers

    Please check. Thank you. 2. What is the reduction half-reaction for the following unbalanced redox equation? Cr2O72– + NH4+ Cr2O3 + N2 A.) Cr2O3 -> Cr2O72– B.) Cr2O72– -> Cr2O3 C.) NH4+ -> N2 D.) N2 -> NH4+ 3. Which oxidation-reduction reactions are

    asked by Jack on March 22, 2013
  48. Math(check)

    1)Find the range of the relation [(-1,4)},(2,5),(3,5)}.Then determine whether the relation is a funtion. 4,5,5 is the range 4,5 is a function 2)Find f(-1),if f(x)= x^2-6x/x+2 (-1)^2-6(-1)/-1+2 1+6/-1+2 7/1 =7 3)Find f(a),if f(t)= 2t^2-t-2. 2(a)^2-a-2

    asked by erin on July 26, 2007
  49. physics

    Under what circumstances, if any, will a converging lens form an inverted image of a real object? Under what circumstances, by itself, will a diverging lens form an erect image of a real object?

    asked by Anonymous on October 21, 2014
  50. Chemistry

    Palladium-107 undergoes â decay (t1/2 = 6.5 x 105 yr) to form silver-107. How long will it take for 0.150 mol of silver-107 to form from 1.25 mol of palladium-107? help please...thank you :)

    asked by Queen on December 7, 2010
  51. Chemistry

    Propane gas (C3H8) burns completely in the presence of oxygen gas (O2) to yield carbon dioxide gas (CO2) and water vapor (H2O). Write a balanced equation for this reaction. Assuming that all volume measurements occur at the same temperature and pressure,

    asked by O on March 6, 2015
  52. Chemistry

    Propane gas (C3H8) burns completely in the presence of oxygen gas (O2) to yield carbon dioxide gas (CO2) and water vapor (H2O). Write a balanced equation for this reaction. Assuming that all volume measurements occur at the same temperature and pressure,

    asked by X on February 20, 2015
  53. Chemistry

    Difference between hydration and hydrogenation reactions? I have searched everywhere in my book and all I can come up with is: Hydorgenation is when atoms of hydrogen H2 are added to the carbons in a double or triple bond of alkenes or alkynes to form what

    asked by Bethany on February 10, 2008
  54. physics

    Part 1 A motorist traveling at 17 m/s encounters a deer in the road 48 m ahead. If the maximum acceleration the vehicle’s brakes are capable of is −5 m/s^2, what is the maximum reaction time of the motorist that will allow her or him to avoid hitting

    asked by amanda and leah on September 9, 2012
  55. AP Chemistry

    The reaction of the molecules to produce ethane is C2H4(g) + H2(g) → C2H6(g). A mechanism for this reaction is shown below: (The figures show how the ethene molecule with two hydrogen molecules attached 'binds' to

    asked by Sophie on April 1, 2018
  56. Chemistry

    Thanks to Dr. Bob for answering all these questions! I always do poorly on conceptual problems. Consider the following equilibrium system at 25°C and select the true statement below: H2PO4−(aq) + SO42−(aq) ↔ HSO4−(aq) + HPO42−(aq) ΔG°rxn > 0

    asked by Richard on February 27, 2017
  57. Chemistry

    Hi, I have another question... I need to write a reaction for the preparation of americium by reducing AmF3 with barium vapor at 1100C I'v looked and can't find anything that will help me with this... (I'm preparing for finals, so this might not be my last

    asked by Lacey on June 9, 2007
  58. Math

    1.Divide.Write your answer in simplest form. (1 point) 2/3 divided by 1/4 a.2 1/2 b.2 2/3 c.2 3/8 d.2 2.Find the product. (1 point) 1/2*3/7 a.4/14 b.3/14 c.7/6 d.2/7 3.Divide.Write the quotient in simplest form. (1 point) 3/5 divided by 2/10 a.6/10 b.3/5

    asked by Rose Johnson on September 21, 2015
  59. Chemistry

    The following reaction has a standard enthalpy of reaction of -146.0 kJ/mol: Cu2O(s) + 1/2 O2(g) -> 2CuO(s) The standard enthalpy of formation of Cu2O(s) is -168.6 kJ/mol. What is the standard enthalpy of formation of CuO(s)?

    asked by James on March 11, 2011
  60. Math HELP PLEASE! QUICK!

    1.Write the rectangular equation in polar form. (x – 4)2 + y2 = 16 2.Write the equation –2x + 6y = 7 in polar form. 3.Graph the polar equation 2 = r cos(theta – 20°). 4. Write the polar equation in rectangular form. r = –12 cos

    asked by Beccaboo on February 26, 2013
  61. Pre-calculus HELP PLASE !

    1.Write the rectangular equation in polar form. (x – 4)2 + y2 = 16 2.Write the equation –2x + 6y = 7 in polar form. 3.Graph the polar equation 2 = r cos(theta – 20°). 4. Write the polar equation in rectangular form. r = –12 cos

    asked by Beccaboo on February 26, 2013
  62. math

    The graph of an equation in the form y=mx + b is a straight line. Can the equation of every straight line be written in the form y=mx + b (Hint: What is the equation of a vertical line?)

    asked by jess on January 11, 2010
  63. Chemistry

    If 26.4 grams of nitrogen and 30.1 grams of oxygen combine to form nitrogen monoxide, how many grams of nitrogen monoxide must form? I am confused on how to do the math.

    asked by Anonymous on January 22, 2017
  64. enviromental

    Completely mixed flow ractor CSTR and plug flow reactor (PFR) may have significantly different efficiencies depending on the reaction order. This problem asks you to compare the relative reactor sizes required to ensure 99.0 % removal of wastewatwer

    asked by don on October 14, 2012
  65. chemistry

    Acids that form ionic solutions will conduct electricity. Acids that form covalent solutions will not conduct electricity. but acids have HYDROGEN in them and hydrogen is a gas is that why the results of the conduction test need to be changed because

    asked by lila on November 1, 2008
  66. General Chemistry (Chem101)

    A chemist mixes two liquids A and B to form a homogeneous mixture. The densities of the liquids are 2.0514 g/mL for A and 2.6678 g/mL for B. When she drops a small object into the mixture, she finds that the object becomes suspended in the liquid; that is,

    asked by Emily on September 20, 2012
  67. chemistry

    Topic: Iodometry 1. The importance of precipitating the Cu2+ ions using NH3 and redissolving it with acetic acid 2. What are other means of detecting endpoint in iodometry aside from adding starch indicator 1. A pH that is too low leads to excessive

    asked by smiley on July 29, 2007
  68. CHEM

    How do I work the following question? I found the amu of CaCO3=101.0872g/mol; 2HCL=72.92128g/mol; H2O=18.1582g/mol;CO2=44.0098g/mol; and, CaCl2=110.9834g/mol. You carefully weigh out 10.00g of powder and add it to 40.50g of solution. You notice bubbles as

    asked by d on October 1, 2007
  69. chemistry

    given this reaction N2O5 -> 2 N2O + 1/2 O2 all gases and given the initial pressure (P Initial) and total pressure (P total)at any time, relate the partial pressure of N2O5 (PP N2O5) to P total for any time during this reaction. Consider gas kinetics. My

    asked by guy on July 7, 2008
  70. chemistry

    What is the solubility of AgCl when it is in a solution of 0.15 M NaCl? (AgCl has Ksp = 1.8 x 10-10.) Make a reaction table. Include rows for initial concentration, change in concentration, and equilibrium concentration. Write down the equation for the Ksp

    asked by Anonymous on May 4, 2012
  71. chemistry

    What is the solubility of AgCl when it is in a solution of 0.15 M NaCl? (AgCl has Ksp = 1.8 x 10-10.) Make a reaction table. Include rows for initial concentration, change in concentration, and equilibrium concentration. Write down the equation for the Ksp

    asked by Anonymous on April 23, 2012
  72. Chemistry

    If air is 20% oxygen, and the reaction is 2C2H2 + 5O2 --> 4CO2 + 2H2O, What volume of oxygen would be needed to completely burn 1.00 L of acetylene (C2H2)? I got 2.50 L but I'm not sure it's right. What volume of air would be needed to completely burn 1.00

    asked by anonymous on May 27, 2015
  73. chemistry

    for the reaction to generate 2‐phosphoglycerate (2PG) from 3‐phosphoglycerate (3PG, ΔG = 0.83 kJ/mol; ΔGo’ = 4.4 kJ/mol. (R = 8.31 x 10‐3 kJ•K‐1•mol‐1) a)What is the ratio of 3PG:2PG in cells at 37C? I got 5.52 as answer for this part but

    asked by sara please help on July 13, 2011
  74. Chemistry

    If 2.00 mL of 0.600 M NaOH are added to 1.000 L of 0.850 M CaCl2, what is the value of the reaction quotient and will precipitation occur? I've been trying this problem over and over and haven't been able to get it. I know precipitation will not occur from

    asked by Rachelle on November 18, 2014
  75. Math

    1: select all the pairs of ratios form a proportion. (2 points) A: 1/6, 4/20 B: 7/9, 28/36*** C: 14/19, 21/27 D: 30/80, 6/18 2: Which pair of ratios does NOT form a proportion? (1 point) A: 3/5, 24/40 B: 30/10, 15/5**** C: 9/14, 3/4 D: 7/12, 14/24 3: For

    asked by AngelDabSwag on May 8, 2018
  76. chem

    For the following reaction, 31.1 grams of diphosphorus pentoxide are allowed to react with with 10.2 grams of water. diphosphorus pentoxide (s) + water (l)>>> phosphoric acid (aq) What is the maximum amount of phosphoric acid that can be formed in grams?

    asked by moose on May 15, 2011
  77. 5th grade Math

    Can you check my answer? 4. Solve. 6 tenths = ___ thousandths Answer = 600 5. Write 347.392 in expanded form. Answer: (3*100)+(4*10)+(7*1)+(3* 1/10) + (9*1/100)+ (2*1/1000) 9. Write in standard form (number name) for: three thousand four hundred eight-two

    asked by Jared on October 7, 2017
  78. CHEM 1B

    Carboxylic acids are stronger acids than alcohols A. This is because the carboxy anion is delocalised. B. This is because the hydrogen atom is delocalised. C. The O-H bond in carboxylic acids is very strong. D. This statement is not true One characteristic

    asked by Lucinda on August 7, 2010
  79. Chemistry

    a 40-year-old manger at a prominent legal firm in L.A experiences abdominal pain post lunch. He goes to the restroom a couple of times, but continues to experience pain and cramps. He evevtually decides to get himself examined. While questioning him, you

    asked by ROCKY on August 21, 2011
  80. health

    what is the importance of nutrition and an active lifestyle? HELP ME HERE! You can expand on this quicky summary. Proper nutrition is important in order to have the nutrients to form bone, muscle, and tissues for proper growth. An active lifestile is

    asked by school girl11 on September 12, 2006
  81. English

    1.Mom always (____) her glasses down somewhere and then can't find them. 2.No one could believe that Carol had been (___) near the dog the entire time. Use correct form of sit or set 1.sets 2.sitting 1.My grades have (----) a little each semester. 2.My

    asked by Hayley on February 6, 2011
  82. Chemistry. Please help!

    A 20.29 g sample of impure MgCO3 is completely decomposed at 1000oC in previously evacuated 2.0 L reaction vessel. After the reaction was complete the solid residue had a mass of 15.9 g. Assume that only MgCO3 could produce gas CO2 what percent of original

    asked by Jordan on December 3, 2008
  83. Biology

    |Question| Living organisms are composed of millions of organic compounds, each having a unique structure. What element is responsible for this huge diversity of molecules? Describe the diversity of structures that can be formed and the properties of this

    asked by jack the cookie monster on August 30, 2017
  84. Chemistry -Please Help

    2. What is the reduction half-reaction for the following unbalanced redox equation? Cr2O7^2– + NH4^+ Cr2O3 + N2 A.) Cr2O3 -> Cr2O7^2– B.) Cr2O7^2– -> Cr2O3 C.) NH4^+ -> N2 D.) N2 -> NH4^+ I think it is B...? 3. Which oxidation-reduction reactions are

    asked by cassie on March 22, 2013
  85. Chemistry

    for the reaction of hydrogen with iodine H2(g) + I2(g) --> 2HI(g) relate the rate of disappearance of hydrogen gas to the rate of formation of hydrogen iodide. and my answer is: rate formation of HI= delta [HI]/delta t and the rate of reaction of I2 =

    asked by Lauren on February 17, 2008
  86. science

    With action-reaction forces, _____. A. the action force is created first B. the reaction force is created first C. the forces are created at the same time D. both forces already existed I think it is D..?

    asked by Cassie on March 15, 2013
  87. Chemistry

    Back again with another problem :) How do you calculate the enthalpy change, in kJ/mol for the reaction of copper(II) sulfate? 0.0210 mol of copper sulfate was added to 25 cm3 of water. The temperature increased by 14°C. The specific heat capacity of

    asked by Autumn on October 24, 2017
  88. 7th grade science help Ms. Sue please!

    1. Most of the life of any cell is spent in a period of growth called _____. (1 point) interphase prophase telophase anaphase 2. Which of these is the part of the cell that contains hereditary material? (1 point) chromosome interphase mitosis embryo 3. The

    asked by Delilah on November 8, 2012
  89. chemistry

    Use the balanced equation below to answer the following questions. 2Al(NO3)3 + 3Na2CO3 Al2(CO3)3(s) + 6NaNO3 - What is the ratio of moles of Al(NO3)3 to moles Na2CO3? (1 point) - If 852.04 g Al(NO3)3 reacted with the 741.93 g Na2CO3, which would be the

    asked by Adrian on February 8, 2012
  90. chemistry

    Ok, so using Le Chatelier's Principle If you add heat to an exothermic reaction, the equilibrium will shift to the left. If you remove heat to an exothermic reaction, the equilibrium will shift to the right. What is it for an ENDOTHERMIC reaction? If you

    asked by K on June 4, 2013
  91. chemistry

    Write word equations for the following chemical reactions. a. Pure copper can be produced by heating copper(II) sulfide in the presence of diatomic oxygen from the air. Sulfur dioxide gas is also produced in this reaction. b. Water is formed by the

    asked by sec 8.1 on January 6, 2011
  92. Chemistry

    The following reaction exhibits the rate law: Rate = k[NO2]^2[Cl2]. 2NO(g)+Cl2(g)---->2NOCl (g) (a) Explain why the following mechanism is not plausible for this reaction. Fast: NO + Cl2NOCl + Cl Slow: NO + Cl---->NOCl (b) Propose a two-step mechanism

    asked by James on March 1, 2012
  93. Chemistry

    Ammonia can be produced in a two-step process. First, nitrogen reacts with red-hot magnesium to form magnesium nitride. Then magnesium nitride reacts with water to form magnesium hydroxide and ammonia. How many grams of magnesium would we have to start

    asked by Anonymous on November 8, 2015
  94. physical science

    For questions #14 – 16, write an equation for the reaction of magnesium oxide with sodium chloride to produce magnesium chloride and sodium oxide. 14. Show the formulas of the reactants. 15. Show the formulas of the products. 16. Write the balanced the

    asked by Maria on December 20, 2014
  95. Math

    What does the representational form of a number mean? For example the representational form of the number 3758.

    asked by Angie on October 12, 2009
  96. language arts

    Is the comparative form of sadly....more sadly? and is the superlative form of sadly....most sadly? Thanks.

    asked by Brandi on March 25, 2012
  97. Reading/Oral & Written

    What is the differants between: verbs that are in base form and verbs that are not in base form

    asked by Minnie on September 26, 2009
  98. MATH

    How do you write an equation in standard form? Ex.How would you write this in standard form? y+1=x+2

    asked by Samantha on November 6, 2008
  99. math

    what is the slope intercept form of (8,3); m = 5 slope intercept form equation (-10,-6); m = -5/8

    asked by lilkakes on January 9, 2019
  100. Math

    Is a polynomial in standard form equal to a polynomial not in standard form?

    asked by Angie on February 17, 2009