1. math, algebra,correction & help

    directions are: write each fraction in simplest form: (-15x^3y^3)/(-20x^1y^4) My answeris: (3x^2)/(4y) THESE TWO NEXT ONES ARE THE ONES THAT I DON'T UNDERSTAND: pROBLEM #1 DIRECTIONS: Write each expression in simplest form. (4x-28)/(5x-35) Problem #2

    asked by jas20 on February 23, 2007
  2. Science

    Please summarize this. I got it from a website and im doing my notecards. Im not trying to plagiarize, Im just not a science person. Please just summarize it so I can just understand it so I can explain it in my own words: The light reaction happens in the

    asked by Losa on October 15, 2013
  3. Algebra

    Can someone show me how to do this? I got 5 more problems of the same kind. Thannk! Consider the polynomial P(x), shown in both standard form and factored form. P(x) = 1/2x^4 - 9/2x^3+21/2x^2+1/2x-15 = 1/2 (x+1)(x-2)(x-3)(x-5) State the behavior at the

    asked by Tammie on July 21, 2009
  4. Algebra

    Can someone show me how to do this? I got 5 more problems of the same kind. Thannk! Consider the polynomial P(x), shown in both standard form and factored form. P(x) = 1/2x^4 - 9/2x^3+21/2x^2+1/2x-15 = 1/2 (x+1)(x-2)(x-3)(x-5) State the behavior at the

    asked by Tammie on July 21, 2009
  5. chemistry

    This is like the other one I posted about. I have to predict the product. Zinc (s) + sulfuric acid (aq) ----> ____ Please and thank you! This is a single replacement type reaction. Products are ZnSO4 and H2. Same type as Al and HCl. how do you know that H2

    asked by Valerie on February 28, 2007
  6. Chemistry/Math

    Write a differential equation describing a second order reaction – a reaction in which the rate of depletion of the concentration of the reactants depends on the square of reactants’ concentration. Solve this differential equation and hence find an

    asked by Alice on November 10, 2008
  7. Chemistry

    Silver forms a compound with nitrogen. In an experiment, 344.588 g of silver is placed in a reaction vessel with 15.906 of nitrogen. After the reaction is complete, all of the silver has been consumed, and there are 359.503 g of compound in the vessel.

    asked by Tray on May 20, 2014
  8. Chemistry Equilibrium

    1.15 g oh h2O (density 1.00 g/ml) is introduced into an empty 1.00 L container. The seled container is heated to 412 K and .150 moles of O2 (g) is present at equilibrium. A. Wrte the equilibrium expression for the reaction above. B. Calculate the

    asked by Lola on February 26, 2015
  9. Chemistry

    1. How would you sketch the probable products of the reaction of the cis and trans with each reagent other than AgNO3? _____ with en _____ with NH3 ____ with KSCN cis: trans: (NOTE: What are the differences between cis and trans and its formation?) 2. How

    asked by Hannah on April 15, 2014
  10. chemistry

    How do these things shift the direction of a chemical reaction?: -adding/removing reactants -adding/removing products -adding/removing energy Thanks! It depends upon the equation and whether the reaction is exothermic or endothermic. Post the entire

    asked by Mira on March 16, 2007
  11. chemistry

    Baking soda is sodium bicarbonate, NaHCO3, and vinegar is primarily acetic acid, HC2H3O2. When baking soda is added to vinegar, the resulting reaction produces a tremendous amount of gas, as shown in this video. Complete this equation for the reaction of

    asked by lee on April 19, 2013
  12. Chemistry

    If the equilibrium constant for a reaction A + B C + D is K, which is true of the equilibrium constant K* for the reaction C + D A + B under the same conditions? A) K* = K B) K* = 1/K C) K* = 1 - K D) K* = 1 - (1/K) E) K* = 1 + K

    asked by Chloe on April 20, 2014
  13. chemistry

    Consider the reaction, 3 H2(g) + N2(g) => 2 NH3(g). How many grams of NH3 will be made by the reaction of 3 moles of H2(g) with 18 moles of N2(g

    asked by michelle on November 16, 2014
  14. MATH

    K we are learning about Linear Equations and Graphs. And I'm doing the Slope-point Form, but I'm kind of having troubles with it. Liek I don't really get how to change the slope point form to the slope intercept one. Here is an example: y-5 = -1/2(x+4) y-5

    asked by Alexa on December 8, 2010
  15. Physics

    Consider the following standing wave, (all units are SI) z=0.2sin(0.4y)cos(350t) (a) what is the wavelength? (b) what is the angular frequency ω in radians/sec? (c) what is the frequency (f) in Hz? (d) The values of y where the displacement is always

    asked by rishabh gupta on May 1, 2013
  16. physics

    a bottle is given a push along a tabletop and slides off the edge of a table. neglect air resistance. a) what force are exerted on the bottle while it is falling from the table to the floor? b) what is the reaction to each force ,that is, on what body and

    asked by flay on January 2, 2013
  17. Chem please help

    What is the purpose of a calorimeter? A. To determine the temperature of a chemical reaction B. To determine the energy changes of a chemical reaction C. To identify the specific temperature of an unknown substance D. To measure the average kinetic energy

    asked by Morgan on November 7, 2014
  18. Chemistry

    For the reaction system, 2 H2O(g) + O2(g) == 2 H2O2 (g), the equilibrium concentrations are (H2O2) = 0.120 M; (H2O) = 0.860 M; (O2) = 0.330 M. Calculate the value of Kc for this reaction. A. 0.423 B. 0.872 C. 0.0590 D. 1.31 E. 2.51 I did 0.120 / 0.860 X

    asked by Hannah on March 4, 2012
  19. Chemistry - Concentration and Time

    1. How is the rate affected by doubling the concentratino? 2. Explain the effect of concentration on the rate of a reaction in terms of the "Collision Theory" of chemical reactions. 3. Considering that 1/Time is proportional to the rate of the reaction how

    asked by Dick Rogers on November 18, 2007
  20. Chemistry

    1. How is the rate affected by doubling the concentratino? 2. Explain the effect of concentration on the rate of a reaction in terms of the "Collision Theory" of chemical reactions. 3. Considering that 1/Time is proportional to the rate of the reaction how

    asked by Dick Rogers on November 18, 2007
  21. chemistry

    Deterioration of buildings, bridges, and other structures through the rusting of iron costs millions of dollars everyday. Although the actual process also requires water, a simplified equation (with rust shown as iron(III) oxide (Fe2O3) is: 4Fe(s)+3O2(g)

    asked by patrick on October 13, 2015
  22. Biology(Anatomy&Physiology)

    1)Which organelle makes most ATP 2)The chemical reaction that joins two amino acids is called 3)In a single molecule of water which type of bond holds the H to the O? 4)Which type of chemical bond results from the transfer of an electron from one atom to

    asked by Stephanie on October 16, 2008
  23. Science Chemistry

    LIST: Sodium carbonate. Calcium carbonate. Zinc sulfate. Zinc nitrate. (a) State a pair of chemicals from the list above that can be used to prepare zinc carbonate by a precipitation reaction involving mixing 2 aqueous solutions together. (b) Write a

    asked by Charlotte on January 8, 2017
  24. chemistry

    A reaction proceeds by the following three-step mechanism with elementary rate coefficients, k. A + B → C k 1 C → A + B k -1 C → B + D k 2 (C is a chemical radical) (ii) By applying the Steady State Approximation determine the overall order of the

    asked by jay on July 30, 2015
  25. Chemistry Urgent

    A calorimeter contains 32.0mL of water at 13.0∘C . When 2.30g of X (a substance with a molar mass of 82.0g/mol is added, it dissolves via the reaction X(s)+H2O(l)¨X(aq) and the temperature of the solution increases to 30.0∘C . Calculate the enthalpy

    asked by Anna on March 12, 2014
  26. Math

    Marcus has a large supply of rectangular wooden tiles. He wants to lay them out to form a square such that there are no gaps, and no tiles overlap. Each tile measures 44 mm wide and 56 mm long a) What will be the dimensions of the smallest square he can

    asked by Jay on March 29, 2016
  27. medical insurance

    a separate release of medical information form a.indicates that the patient has alredy paid for the services b.is innecessary if the release of information statement is included on the insurance billing form c.indicates that payments are to be made to the

    asked by susue on December 30, 2013
  28. Algebra..

    HELP. Problems 4 - 7: Write an equation for the line in point/slope form and slope/intercept form that has the given condition. 4. Slope = 3/2 and passes through the origin. 5. x-intercept = 4 and y-intercept = -3

    asked by 987:) on September 14, 2012
  29. Chemistry

    A 5.00L reaction vessel contains hydrogen at a partial pressure of 0.588atm and oxygen gas at a partial pressure of 0.302atm. The equation is 2H2(g)+O2(g)-> 2H2O(g). Suppose the gas mixture is ignited and the reaction produces the theoretical yield of the

    asked by Heather on October 2, 2012
  30. Chemistry***

    A mixture containing 19.8 moles of H2 and 7.2 mole of I2 was allowed to reach equilibrium in a 5 L closed vessel at ToC according to the equation: H2 (g) + I2 (g) 2HI (g) At equilibrium, 14 moles of H2 was present. The equilibrium constant for this

    asked by plasma membrane on December 30, 2014
  31. Chemistry

    a middle-aged man has been diagnosed as being at high risk group of developing Coronary Artery Disease. Distinguish between the good and bad forms of this sterol. 'Explain the function of the good form of this sterol in the body. List the food groups that

    asked by ROCKY on September 25, 2011
  32. AP Chem

    Use the following information to identify element A and compound B, then answer questions a and b. I'm so stuck on this problem and don't know where to begin. I need to have this problem done by Wednesday. PLEASE HELP!!! An empty glass container has a mass

    asked by John on January 21, 2008
  33. organic chemistry

    I really need help with this question. It is located at the link below. Question #2. I understand the general reaction but I need help with the actual mechanism. Olopatadine is a drug used topically to treat the itching associated with conjuctivitis It is

    asked by ha on January 21, 2013
  34. chemistry

    The first step in the process used to recover zinc metal from zinc sulfide ore is the reaction of zinc sulfide with oxygen gas to produce zinc oxide and sulfur dioxide. 2 ZnS(s) + 3 O2(g) → 2 ZnO(s) + 2 SO2(g) When the external pressure is 142700 Pa and

    asked by windal on April 25, 2016
  35. Chemistry

    You carefully weigh out 19.00 of powder and add it to 76.95 of solution. You notice bubbles as a reaction takes place. You then weigh the resulting solution and find that it has a mass of 88.16 . The relevant equation is CaCO3+2HCl ----> H2O + CO2 + CaCl2

    asked by ALISON on September 10, 2011
  36. Chemistry

    In an experiment, 13g of methanol and 11 g of carbon monoxide were placed in a reaction vessel. Given the following reaction C:12.0 amu O:16.0 amu H:1.0 amu CH3OH + CO --> HC2H3O2 1 What is the theoretical yield of acetic acid? 2 If the actual yield of

    asked by Sara on May 1, 2015
  37. Chemistry

    In a spontaneous oxidation-reduction reaction between aluminum and silver ion, the aluminum(III) ion and solid silver are formed. If 0.001g of aluminum is consumed in this reaction, how much silver is produced? a)1.20g b)1.00g c)3.00g d)530g

    asked by Kayy on November 4, 2010
  38. Chemistry

    The reaction of fluorine with ammonia produces dinitrogen tetrafluoride and hydrogen fluoride. 5 F2(g) + 2 NH3(g) N2F4(g) + 6 HF(g) (a) If you have 73.7 g NH3, how many grams of F2 are required for complete reaction? b) How many grams of NH3, are required

    asked by Kelsey on January 28, 2011
  39. Chemistry

    Consider a one step reaction. Which of the following does not describe the activation energy of the process? The minimum amount of energy needed for a reaction to occur The energy difference between the starting point and the transition state The energy

    asked by John on February 4, 2017
  40. Math

    Find the slope intercept form of the line with the following properties. Slope=4 containing the points (-2,-5) I know that slope intercept form is y=mx+b so the m is the slope which is 4 but now I get confused since they give me x any y values (-2,-5). Is

    asked by Hannah on October 6, 2010
  41. Math

    How do I put this equation in slope intercept form? 2. 2x + 3y = 6 Slope intercept form is y = mx + b Subtract 2x from both sides and then divide both sides by 3. I hope this helps. Thanks for asking.

    asked by Austin on May 24, 2007
  42. Math

    Find the slope intercept form of the line with the following properties. Slope=4 containing the points (-2,-5) I know that slope intercept form is y=mx+b so the m is the slope which is 4 but now I get confused since they give me x any y values (-2,-5). Is

    asked by Hannah on October 6, 2010
  43. Algebra

    I don't know how to put this in standard form: f(x)=x^2-2x-15 I tried (x^2-2x+-x^2)-25-x^2, but x^2 doesn't factor into anything so I can't fully put it into standard form. can you show me how, plus how to find the x intercepts and y intercepts?

    asked by Murajabash on November 13, 2009
  44. maths

    A piece of wire when bent in the form of square encloses an area of 484cm sq.now if the same wire is bent in the form of circle area enclosed by it would be

    asked by aditi on May 4, 2011
  45. English

    1. Complete the sentences by using the words in the parenthesis. 2. Complete the sentences by using the words in the parentheses. --------------------------- Which one is right? Do we have to use the singular form or the plural form at the end of each

    asked by rfvv on August 30, 2016
  46. Math

    Mac's farm has a total of 18 horses and 27 cows. What is the ratio of horses to cows in simplest form? A: 6/9 B: 18/27 C: 2/3 D: 3/2 I say the answer is b because 18/27 is the numbers and it is simplest form.

    asked by Byron Smith on October 31, 2015
  47. chemistry

    Consider the following unbalanced reaction. P4(s) + 6F2(g) 4PF3(g) How many grams of F2 are needed to produce 114. g of PF3 if the reaction has a 78.1% yield? i tried it and got this 114g PF3 x (mol PF3/87.97g PF3) x (6 mol F2/ mol PF3) x (38g F2/mol

    asked by lyne on February 5, 2009
  48. Geography

    I'm writing a paper about sedimentary rocks. My goal is 700 words but I'm stuck. can someone read this and let me know if I'm overlooking some important facts? ************************************* Sedimentary rocks are rocks that have accumulated at the

    asked by pooleboy on October 25, 2009
  49. math

    the points (-9,0) and (19,0) lie on parabola. a.) determine an equation for its axis of symmetry: X=5 b.) the y-coordinate of the vertex is -28. determine an equation for the parabola in factored form. c.)write your equation in part b) in standard form.

    asked by imurhero on June 19, 2011
  50. English

    1. She also takes the sick chilren outside in wheelchairs/ a wheelchair. 2. She took the patient in a wheelchair. 3. She took the sick person in wheerchairs. (Which expressio do I have to use? A singular form or a plular form:a wheelchair or wheelchairs?

    asked by rfvv on October 4, 2010
  51. Chemistry

    Diatomic O2 can react with the element magnesium to form magnesium oxide (MgO). The balanced chemical equation is: If 4 moles of magnesium totally reacted with more than enough O2, how many moles of MgO would be expected to form?

    asked by Anonymous on July 7, 2015
  52. MATH !!!

    PLEASE ANSWER THESE 3 I BEEN STUCK ON ALL DAY AND IM SICK OF THEM JUST WANNA SLEEP..PLEASE LABEL ANSWER WITH A B C D ! 1.which pair of ratio form a proportion? choose all that apply. A. 1/6, 4/20 B. 7/9, 28/36 C. 14/18, 21/27 D. 30/80, 8/18 2.which pair of

    asked by annabelle on January 24, 2014
  53. organic chem

    One characteristic of monomers that form addition polymers that is not common in monomers which form condensation polymers is: a. the presence of alkyl side chains b. the presence of two functional groups. c. the presence of pi bonds. d. None of the above.

    asked by Lucinda on August 6, 2010
  54. math

    The large red equilateral triangle has sides of 8x units. The midpoints of the red triangle are joined to form the blue triangle. The midpoints of the blue triangle ate joined to form the green triangle. The process of joining midpoints to form new

    asked by Jo on January 12, 2016
  55. chemistry

    Am I correct? Deterioration of buildings, bridges, and other structures through the rusting of iron costs millions of dollars everyday. Although the actual process also requires water, a simplified equation (with rust shown as iron(III) oxide (Fe2O3) is:

    asked by patrick on October 14, 2015
  56. linear algebra

    if: A and B are matrices and A^2 is similar to B^2 Is A guaranteed to be similar to B? ------- Matrix similarity means that the matrices are identical if one of the matrices is converted to another basis. If matrices C and D are similar: C = P^-1 * D * P

    asked by mathstudent on July 20, 2007
  57. Chemistry

    Then calculate the inital ClO^- concencentrations for 1st, 2nd, and 3rd reactions. Calculate [ClO^-] in a 6% bleach solution. A 6% bleach solution contains 6 grams of NaClO per 100 grams bleach. The density of 6% bleach is 1.07g/mL. Chemical reaction: Blue

    asked by Cassandra on February 28, 2012
  58. Chemistry(Please respond)

    Step 1:H2O2 + I^-^ = H2O + OI^-^ step 2: H2O2 + OI^-^ = H2O + O2 + I^-^ What is the equation for the overall reaction? I am not sure how to do this since there are two equations. Complete the rate law for the overall reaction. I know how to do this one but

    asked by Hannah on April 19, 2012
  59. Further Maths

    uniform ladder of length 5m and weight 80 newtons stands on rough level ground and rests in equilibrium against a smooth horizontal rail which is fixed 4m vertically above the ground. If the inclination of the ladder to the vertical is x, where tan x is

    asked by Max on February 27, 2015
  60. sosial studies

    When 1.0 L solution Ba (NO3) 2 2.0 M at 25oC is mixed with 1.0 L solution of 2.0 M Na2SO4 in a calorimeter, the reaction that occurs to produce solid barium sulfate and temperature of the mixture increased to 28.1 oC. Calculate the enthalpy change per mole

    asked by Norsiah on November 20, 2013
  61. calculus

    Sorry to post this again, but I am still unable to understand it and need help. Please help.1) Using 3(x-3)(x^2-6x+23)^2 as the answer to differentiating f(x)=(x^2-6x+23)^3/2, which I have been able to do, I need to find the general solution of the

    asked by Claire on May 22, 2011
  62. Science (Chemisty)

    In an old "Star Trek" episode, Captain Kirk and Spock come across a life form called the Horta made mostly of silicon compounds. Based on silicon's place in the periodic table, do you think silicon compounds are a reasonable choice for an alien life form?

    asked by Jeremiah on October 26, 2010
  63. chemistry

    When 0.752 g of Ca metal is added to 200.0 mL of 0.500 M HCl(aq), a temperature increase of 12.2C is observed. Assume the solution's final volume is 200.0 mL, the density is 1.00 g/mL, and the heat capacity is 4.184 J/gC. (Note: Pay attention to

    asked by nickel on February 10, 2007
  64. Chemistry

    In a reaction between pure acetic acid and sodium bicarbonate, 14.7 grams of sodium bicarbonate was added to 21.0 mL of acetic acid. Which reactant is the limiting reactant in this reaction? Name of limiting reactant (acetic acid or sodium bicarbonate):

    asked by Kayla on September 13, 2013
  65. Chem

    Solutions of sodium carbonate and silver nitrate react to form solid silver carbonate and a solution of sodium nitrate. A solution containing 3.30 g of sodium carbonate is mixed with one containing 3.00 g of silver nitrate. How many grams of each of the

    asked by Ezra on September 17, 2012
  66. Chemistry

    Sulfur trioxide gas, one of the causes of acid rain, is produced in the upper atmosphere when oxygen reacts with sulfur dioxide gas in the reaction shown below: 2SO2(g) + O2(g) 2SO3(g) deltaH0 = -197kJ The gases are placed in a reaction vessel and allowed

    asked by Abbagail on April 6, 2012
  67. Art

    An environment artist created a piece in protest of trash. Anticipation negative public reaction, the artist decided to display the work anyway. what is the most likely reason? 1. The artist believed that the purpose of the work was to stir up awareness 2.

    asked by Shown on February 5, 2016
  68. L.A

    Read the following stage directions and dialouge from billy Elliot: [Billy suddenly sees DAD and freezes. His reaction puzzles Mrs. Wilkinson for a second. The music comes to a standstill. Mrs. Wilkinson turns to see Dad.] DAD: You.Out.Now What most likely

    asked by Anonymous on March 4, 2015
  69. Chemistry

    027 (part 1 of 3) 10.0 points Copper reacts with silver nitrate through single replacement. If 3.03 g of silver are produced from the reaction, how much copper(II) nitrate is also produced? Answer in units of mol. 028 (part 2 of 3) 10.0 points How much Cu

    asked by danny on April 9, 2015
  70. Science

    The Haber-Bosch process, devised in the early 20th century, revolutionized global industry. It provides a way of “fixing” atmospheric nitrogen into ammonia, allowing for the production of fertilizers and the many nitrogen-based chemicals we use today.

    asked by John Lee on June 4, 2016
  71. Chemistry I

    For the methanol combustion reaction 2CH3OH(â„“) + 3O2(g) ----> 2CO2(g) + 4H2O(g) estimate the amount of P [change]V work done and tell whether the work was done on or by the system. Assume a temperature of 27â—¦C. 1. 2.5 kJ, work done by the

    asked by Anonymous on July 2, 2010
  72. Chemistry

    biochemists consider the citric acid cycle to be the central reaction sequence in metabolism. One of the key steps is an oxidation catalyzed by the enzyme isocitrate dehydrogenase and the oxidizing agent NAD+. Under certain conditions, the reaction in

    asked by Lety on June 20, 2014
  73. Chemistry

    Use the data in the table to calculate the equilibrium constant for the following reaction. HCOOH(aq)+ OH −(aq) equilibrium reaction arrow HCOO−(aq)+ H2O(l) HCOO is 5.9e-11 (Kb) HCOOH is 1.7e-4 (Ka) Not sure how to find the equilibrium constant given

    asked by Dani on April 12, 2017
  74. AP Chemistry

    A mixture consisting of 1 mol of H2O(g) and 1 mol CO(g) is placed in a 11 L reaction vessel at 800 K. At equilibrium, 0.422 mol CO2(g) is present as a result of the reaction CO(g) + H2O(g)CO2(g) + H2(g). What is Kc at 800 K?

    asked by Gabriella on November 27, 2013
  75. chemistry

    Solid lead(II) iodide was prepared by reacting 65.0 mL of a solution containing 0.218 M lead(II) ions with 80.0 mL of a solution containing 0.265 M iodide ions. If the actual yield of the reaction was 3.26 g, which choice is closest to the %yield of the

    asked by K on January 23, 2015
  76. Language Arts

    Which words should be deleted to remove redundancy? At first, my initial reaction was to cancel my subscription to the monthly magazine because the customer service representative was so rude to me. A) At first, B) monthly magazine C) my initial reaction

    asked by Marc on January 27, 2016
  77. Chemistry

    For the reaction of nitric oxide, NO with chlorine Cl2 2NO(g) + Cl2(g)--> 2NOCl(g) the observed rate law is k[NO]^2 [Cl2] what is the reaction order with respect to nirtic oxide? with respect to Cl2? What is the overal order? how

    asked by Lauren on February 17, 2008
  78. American Government

    To what concept does this excerpt refer? "whenever any Form of Government becomes destructive of these ends, it is the Right of the People to alter or to abolish it, and to institute new Government, laying its foundation on such principles and organizing

    asked by leslie on August 19, 2016
  79. math

    Find the place value of 7 and 8 in the number 9.7548. (b). Write 23459/1000 in decimal form. (c). Write 3.537 in English words. (d). Write twelve and seventeen thousandths in decimal form. (e). Complete the statements below, using the symbol “”. 0.889

    asked by rosland on January 10, 2009
  80. math

    determine the equation of the line in y=mx+b form that passes through 1. (-8,1) & (-9, 2) 2. (3,7) & (-5, 9) 3, (-4,0) & (4,6) Part B ) For each equation Rewreite the y=mx+b equation in general form Ax+by+c=0 where A is positive b and C are integers In

    asked by thomas on February 9, 2007
  81. ashford

    All of the following are true of what typically occurs when first meeting someone EXCEPT: (Points : 1) First impressions are based mostly on facial appearance. We form our impressions of others within less than a second of meeting them. We form conclusions

    asked by Lisa on January 25, 2014
  82. Math

    According to the Department of Health and Human Services, 30% of 18- to 25-year-olds have some form of mental illness. (a) What is the probability two randomly selected 18- to 25-year-olds have some form of mental illness? (b) What is the probability six

    asked by Keonn'a on March 15, 2018
  83. Calorimetry Chemistry

    Please help with these questions. Thanks Consider the reaction C12H22O11(s)+ 12O2(g)-->12CO2(g)+11H2O(l)

    asked by Sarah on September 23, 2008
  84. CHEMISTRY

    In a study of the reaction of magnesium with hydrochloric acid, two experiments were carried out. Each uses 1 g of magnesium ribbon, and 50 mL of hydrochloric acid was added to each reaction flask. One of the hydrochloric acid solutions added was more

    asked by Anonymous on November 17, 2013
  85. English

    Identify the prepositional phrases in the following sentences. 4. Clusters of stars form constellations. PP= of stars 5. Seven very bright stars surrounded by dust form the Seven Sisters. PP= form the Seven Sisters, PP= Seven very bright Identify the

    asked by Lilly on February 7, 2010
  86. Geometry

    write the following reversible statement as a biconditional: If two perpendicular lines intersect, they form four 90 degree angles. -Two intersecting lines are perpendicular if and only if they form four angles. -Two intersecting, perpendicular lines do

    asked by Blurryface on January 19, 2017
  87. Art

    an environment artist created a piece in protest of trash. Anticipation negative public reaction, the artist decided to display the work anyway. what is the most likely reason? A. The artist believed that the purpose of the work was to stir up awareness B.

    asked by Vanessa on February 5, 2016
  88. Journalism

    3.Which is not a form of journalism? A(a weekly raido show) B(an internet podcast) C(a radio show) D(an evening news program) 4. Who makes sure the information in articles and part of newscasts are correct? A(the reporters) B(the editors) C(the fact

    asked by Need help plz on October 31, 2018
  89. Chemistry

    A calorimeter contains 21.0 mL of water at 14.0 degreesC. When 1.90 g of X (a substance with a molar mass of 70.0 g/mol) is added, it dissolves via the reaction X(s)+H_2O(l)reacts to make X(aq) and the temperature of the solution increases to 28.5degreesC.

    asked by Ellen on October 22, 2010
  90. chemistry

    4NH3 + 5O2 → 4NO + 6H2O 2NO + O2 → 2NO2 3NO2 + H2O → 2HNO3 + NO In this process, the NO made in the last reaction is recycled back into the second reaction and used as a reactant. In the end, all of the NO produced is recycled back so that when the

    asked by jane on September 29, 2011
  91. chemistry

    kbear1 Read the following statement. Early on, atomic theory claimed that atoms were indivisible. Which answer choice describes how scientists refuted the claim of atomic theory stated above? (Select all that apply.) Scientists bombarded atoms of large

    asked by check answer please on September 8, 2017
  92. Metals

    Transition metals (also called heavy metals) form insoluble compounds with hydroxide ions. Therefore, it is possible to extract heavy metal ions from water by raising the pH. The precipitation reaction between cadmium(II) and hydroxide is shown below.

    asked by Chemistry on April 19, 2015
  93. Chemistry(Please check)

    A reaction has a rate law, rate = k times A times B squared. What is the overall order of the reaction. I think that the order is 0. Is this correct?

    asked by Hannah on February 19, 2012
  94. chemistry

    Use the standard reaction enthalpies given below to determine ΔH°rxn for the following reaction: 2 NO(g) + O2(g) → 2 NO2(g), ΔH°rxn = ? Given: N2(g) + O2(g) → 2 NO(g), ΔH°rxn = +183 kJ 1/2 N2(g) + O2(g) → NO2(g), ΔH°rxn = +33 kJ

    asked by Amber on June 15, 2011
  95. Chemistry

    Consider the reaction, CH4(g) + 2 O2(g) => CO2(g) + 2 H2O(g). How many grams of H2O(g) will be made by the reaction of 17 moles of CH4(g) with 7 moles of O2(g)?

    asked by Alle on November 30, 2010
  96. chem

    Can someone check this for me? Predict which reactions are spontaneous: a) Zn(s) + 2H+(aq) --> Zn+2(aq) + H2(g) b) CaCO3(s) + 2H2O(l) --> Ca(OH)2(s) + H2CO3(aq) c) CH4(g) + O2(g) --> CO2(g) + 2H2O(g) d) Ag+(aq) + Cl-(aq) --> AgCl(s) I said a) and c) were

    asked by Chris on March 5, 2007
  97. Chemistry 12

    9. According to Arrhenius, which of the following groups contain: i)only acids ii)only bases a. NaOH, H2CO3, KCl b. MgCl2, H2SO4, HCl c. HNO3, HCl, H3PO4 d. Mg(OH)2, AgBr, HF e. KOH, NH4OH, Ba(OH)2 10. Enough water is added to 100 g of sodium hydroxide in

    asked by Kavitha on May 22, 2011
  98. Chemistry

    Which of the following statements is true if HI is formed in the following reaction? H2(g) + I2(g) → 2HI(g) a.There are no collisions between the reactants in the reaction. b. All of the collisions between reactants have enough energy to overcome the

    asked by Ramon on March 23, 2018
  99. Chemistry

    Which of the following statements is true if HI is formed in the following reaction? H2(g) + I2(g) → 2HI(g) a. There are no collisions between the reactants in the reaction b. All of the collisions between reactants have enough energy to overcome

    asked by Ramon on March 23, 2018
  100. chemistry

    Choose the correct integrated rate law for each reaction order.? Choose the correct integrated rate law for each reaction order. Reaction Order Answer zero ____ first _____ second _____ a. l/[A]t = kt + l[A]0 b. log[A]t = kt +log[A]0 c. ln[A]t = �kt +

    asked by Amy on May 15, 2008