Popular questions and responses by Fiona
  1. Chemistry

    The equilibrium constant is equal to 5.00 at 1300K for the reaction 2SO2(g) + O2(g) 2SO3(g) if initial concentrations are [SO2] = 6.00M, [O2] = 0.45M, [SO3]= 9.00M, the system is a/. At equilibrium b/. Not at equilibrium and will remain in an un

    asked on April 5, 2017
  2. trig

    a hedgehog wishes to cross a road without being run over. he observes the angle of elevation of a lamp post on the other side of the road to be 27 degrees from the edge of the road and 15 degrees from a point 10m back from the raod. How wide is the road??

    asked on October 16, 2010
  3. Algebra

    A page should have perimeter of 42 inches. The printing area within the page would be determined by top and bottom margins of 1 inch from each side, and the left and right margins of 1.5 inches from each side. What should be the overall dimensions of the

    asked on February 22, 2016
  4. Chemistry

    Which of the following reactions is exothermic? 1. Na(s) --> Na(g) 2. Na(g) --> Na+ + e- 3. Cl2(g) --> 2Cl(g) 4. Cl(g) + e- --> Cl-1 My guess is 4, but I'm not sure Here is what you do. For 1, do we think it will take energy to change Na as a solid to Na

    asked on April 30, 2007
  5. Physics

    1)How much work is done by a person lifting a 2 kg object from the bottom of a well at a constant speed of 2m/s for 5 s. Is the answer mgh=2*9.8*10m 2)A 2kg block slides on a rough horizontal surface. A force (magnitude = 4N) acting parallel to the surface

    asked on April 5, 2011
  6. Chemistry

    for the reaction 4NH3(g) + 5O2(g) 4NO(g) + 6H2O(g) if H = -950kJmol-1, does that mean it's an exothermic reaction? Ooops pressed Post too quickly. Yes it is exothermic. Delta H is negative so heat is lost from the system. If delta H is positive a reaction

    asked on April 30, 2007
  7. math

    a picture framer has a board 10 1/12 feet long. the framer notices that 2 3/8 feet of the board is scratched and cannot be used. the rest if the board will be used to make small picture frames. each picture frame needs 1 2/3 feet of a board. at most, how

    asked on November 5, 2014
  8. chemistry

    H2 + I2 -> 2Hl 1.2 mol of hydrogen gas reacts with 1.0 mol of iodine vapour, after 5 minutes 0.6 mol of iodine remained. A) calculate the number of moles of hydrogen that have not reacted after 5 minutes. B) calculate the number of moles of hydrogen iodide

    asked on December 12, 2012
  9. chemistry

    The heat of solution of potassium acetate (KC2H3O2) in water is -15.3 kJ/mol. If 18.8 g of KC2H3O2(s) is dissolved in 655 mL of water that is initially at 25.8 °C, what will be the final temperature (in degrees Celcius) of the resulting aqueous solution?

    asked on March 3, 2015
  10. Physics

    A person weighs 150 N on the moon. If the acceleration due to gravity on the moon is 1.63 m/s2, what is the mass of the person?

    asked on February 2, 2015
  11. 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 on July 28, 2007
  12. Chemistry

    I think I made a mistake with my previous question. I have two solutions potassium thiocyanate (KSCN) and iron (III) chloride (FeCl3). The reaction is Fe+++(aq) + SCN-(aq) FeSCN++(aq) What will happen if the solution is heated? Will the reaction rate shift

    asked on May 2, 2007
  13. Math

    Find the height of the tower to the nearest tenth of a meter. the dimensions are 58 degrees and 36m. [its a right angle triangle]

    asked on October 6, 2015
  14. Chemistry

    in the reaction of aluminium and iron (III) oxide to form iron and aluminium oxide, H-850 kJ. how many grams of aluminium oxide are formed when 350 kJ are released? 2Al(s) + Fe2O3 -- Fe(s) + Al2O3(s) H=-850 kJ

    asked on May 24, 2012
  15. chemistry

    Determine the of mole of water molecules in one mole of a sample of an iron containing (nh4)2so4. FeSO4. nH2O. titrate a solution of the iron containg (solution Y)

    asked on December 3, 2011
  16. Chemistry

    Do you know the carbon chain lengths for the different states of alkynes? Eg alkanes having a carbon chain length of 1-4 are gases, 5-16 are liquids and 17+ are solids. Are there similar rules for alkynes?

    asked on October 4, 2007
  17. chemistry

    Why is a solution of KNO3 neutral and not acidic? K^+ doesn't hydrolyze (H2O has a stronger attraction for the OH- than K^+) and NO3^- doesn't hydrolyze (H2O is a stronger base than NO3^- meaning that H2O will not donate a proton to NO3^-). Looking at it

    asked on May 13, 2007
  18. Chemistry

    When we mix NaOH and H2SO4 we get the equation OH-(aq) + H+(aq) --> H2O(l) and if we mix H2CO3 and NaOH we get the equation 2OH-(aq) + H2CO3 --> 2H2O(l) + CO3-2(aq) Why aren't the two equations the same? ie only one mol of NaOH reacts in the first equation

    asked on May 12, 2007
  19. Chemistry

    I have two substances potassium sulfate and potassium carbonate. They are unlabelled and I need to know which one is which. If I add HCl to each substance ie K2SO4(s) + 2HCl(aq)-->2KCl(aq) + H2SO4(aq) K2CO3(s) + 2HCl(aq)--> 2KCl(aq) + H2O(l) + CO2(g) What

    asked on April 24, 2007
  20. Chemistry

    In the reaction 2H20(aq) --> O2(g) + 2H20(l) why doesn't increasing the pressure of oxygen have any effect on the reaction rate? Balance the equation first. What you have isn't balanced. Frankly, it doesn't look possible. You have two mols H2O on each

    asked on April 19, 2007
  21. Chemistry

    Given four unlabeled compounds and four labels (potassium sulfate, potassium carbonate, chromium sulfate, and cobalt bromide) is there a simple test that will allow correct labelling of each compound? I take we are looking for a simple school lab type

    asked on April 13, 2007
  22. math

    if vertices A(2,3),B(-2,2) and C(-1,4) are reflecred in the line y=x+1,what are the knew coordinates?(A',B',C')

    asked on November 12, 2019

    African slaughter rituals should be allowed in the suburbs

    asked on April 13, 2019
  24. Math

    Find two numbers for which the sum is 51 and the difference is 13.

    asked on November 20, 2016
  25. Math

    The sum of two numbers is 63. One number is 7 more than the other. Find the numbers.

    asked on November 20, 2016
  26. College Algebra

    Find a pair of positive integers such that the sum of the numbers is 20 and the sum of their reciprocals is 4/15.

    asked on September 20, 2016
  27. maths

    a swimming pool is 100m long,20 meter wide and 3cm deep.find the height

    asked on July 25, 2016
  28. financial management

    For a tuition of 20,000 now, how much will i need to save if my child is 5yrs now and will go to college for 4 yrs in the 13 yrs?

    asked on July 17, 2016
  29. Math (Pre-Calc)

    Find all the solutions of the equation in the interval {o,2pi) 5sqrt3 tan x+3=8sqrt3 tan x

    asked on February 8, 2015
  30. chemistry

    The ionic equation and net ionic equation and balance equation: A) Ca(OH)2 + HNO3 --> B) H2SO4 + Na2CO3 --->

    asked on January 12, 2015
  31. Math

    Condense the expression to the logarithm of a single quantity. 5lnx-6ln(x+2)

    asked on November 14, 2014
  32. math

    trina works after school and on weekends. she always works three days each week. this week she worked 2 3/4 hours on monday, 3 3/5 hours on friday and 5 1/2 hours on saturday. next week she plans to work the same number of hours as this week, but will work

    asked on November 5, 2014
  33. Science (How Do I Do This?)

    A car skids to a stop at a traffic light, leaving behind a 8.25m skid mark as it comes to a rest. Assuming that the car is travelling at 14.5m/s and only the friction from the tires on the roadway stop the vehicle. Find the coefficient of friction

    asked on November 4, 2014
  34. math

    Explain why 2.15 and -2.15 are opposites.

    asked on October 8, 2014
  35. Math

    1.) Which of the following inequalities is true for all real values of x? a.) x^3≥^2 b.) 4x^2≥2x^2 c.) (3x)^2≥4x^2 d.) 2(x-3)^2≥2x^2-3 2.) Which following inequalities is true for all real values of x? a.) x^5≥x^4 b.) 5x^2≥2x^3 c.)

    asked on October 5, 2014
  36. Algebra

    Okay, so! I figured out how to get the Point-slope form to the question I was given which led me to y+3 =-2(x+1), but, now I'm stick on finding the Slope Intercept form to get my answer. Can someone help me? Thanks!

    asked on September 15, 2014
  37. Algebra 1

    How do you solve this? Thanks! y+3 = -2(x+1)

    asked on September 14, 2014
  38. Spanish 2

    Re-write the sentences in Spanish. Are my answers correct? Thanks! :) 1.) I used to eat. 2.) Clean!! 3.) You (informal) have seen the movie. 4.) I practiced yesterday. 5.) When I was young, I played soccer. My answers: 1.)Yo solía comer. 2.)Limpio!

    asked on May 19, 2014
  39. Algebra 2!

    1.) ƒ(x) = (x^4)/4 − 3x^3 + (23x^2)/2 - 15x. Find the x values where the extremes occur. 2.) On a 10 question exam each question is worth 10 points (no partial credit). How ways can you make a 70%? 3.) Write the polynomial in standard form. Then

    asked on May 8, 2014
  40. Algebra 2

    Hello! I need help with these four math problems. Thanks so much! :) 1.) ƒ(x) = (x^4)/4 − 3x^3 + (23x^2)/2 - 15x. Find the x values where the extremes occur. 2.) On a 10 question exam each question is worth 10 points (no partial credit). How ways can

    asked on May 8, 2014
  41. Physics please help?????

    A 540 g block is released from rest at height h0 above a vertical spring with spring constant k = 320 N/m and negligible mass. The block sticks to the spring and momentarily stops after compressing the spring 19.8 cm. How much work is done (a) by the block

    asked on March 16, 2014
  42. Physics

    A 540 g block is released from rest at height h0 above a vertical spring with spring constant k = 320 N/m and negligible mass. The block sticks to the spring and momentarily stops after compressing the spring 19.8 cm. How much work is done (a) by the block

    asked on March 16, 2014
  43. Math

    Write this equation as a logarithm of a power: w ln 4

    asked on May 10, 2013
  44. Physics

    Runner A is initially 2.4 km west of a flagpole and is running with a constant velocity of 8.4 km/h due east. Runner B is initially 2.2 km east of the flagpole and is running with a constant velocity of 7.4 km/h due west. What will be the distance of the

    asked on September 14, 2012
  45. Physics

    Runner A is initially 2.4 km west of a flagpole and is running with a constant velocity of 8.4 km/h due east. Runner B is initially 2.2 km east of the flagpole and is running with a constant velocity of 7.4 km/h due west. What will be the distance of the

    asked on September 14, 2012
  46. encryption

    Show that the active CCA against ElGamal encryption given in the lecture does not work when against the Cramer-Shoup encryption.

    asked on October 18, 2011
  47. MATH

    How do you go about finding equations to a given solution set?

    asked on May 10, 2011
  48. Chemistry

    I have a couple of questions I need a hand with: 1. Oxygen has a melting point of -218 degrees celcius and a boiling point of -183 degrees celcius. This means that oxygen would be a liquid at...? Please do not tell me the answer, but tell me the relation

    asked on January 18, 2011
  49. Chemistry

    Name one difference between acids and bases in terms of: -Their chemical formula -A property Any help would be awesome.

    asked on January 14, 2011
  50. college Finite

    Find the probability of at least 3 successes and at least 2 failures. N(trials)=10 and p=3/10

    asked on October 10, 2010
  51. college math213

    place parentheses, if needed, to make each of the following equations true: a.5+6.3=33 b.8+7-3=12 c.6+8-2/2=13 d.9+6/3=5

    asked on July 27, 2010
  52. Chemistry

    If 2 g of salicylic acid is heated with 4 g of acetic anhydride, what is the theoretical yield ? C7H6O3 + C4H6O3 --> C9H8O4 + C2H4O3

    asked on April 17, 2010
  53. math

    I need help to get started with writing the equation for the following problem: It takes a freight train 2 hours longer to travel 300 miles than it takes an express train to travel 280 miles. The rate of the express train is 20 miles per hour greater than

    asked on April 1, 2010
  54. Math 6th

    Why do eskimos wash their clothes out tide? (can only be 10 letters)

    asked on March 10, 2010
  55. Physics-please help!!!

    A 190 g particle is released from rest at point A inside a smooth hemispherical bowl of radius 25.0 cm. Calculate the gravitational potential energy at A also, how do you find kinetic energy if you aren't given velocity? please help me! i would really

    asked on November 19, 2009
  56. Math for educators

    Help please! What is the domain and range for the following numbers 2.68, 2.58, 2.38? Thank you

    asked on November 8, 2009
  57. English

    I'm not sure how to quote a dialogue from a play in my essay. And if it includes a line such as: WALTER(With immense passion) Because it is life, Mama! Do include the part in parethesis?

    asked on September 12, 2009


    asked on May 18, 2009
  59. Language Arts/Poetry

    In the poem "Parade" by Rachel Field, what details in the poem describe the town? The only thing I see is the elm trees and the grass. Can you help me?

    asked on December 17, 2008
  60. history

    When was the Hellenic period in Greece?

    asked on December 29, 2007
  61. history

    Why did Alexander go to India? Was it for gold? Did he conquer any cities there or name any after himself? Thank you.

    asked on December 28, 2007
  62. history

    Where did Cleopatra die? Thanks much!

    asked on December 23, 2007
  63. Chemistry

    What is the suffix for an alcohol which contains more than three -OH groups?

    asked on October 5, 2007
  64. math

    how d you turn the roman numeral number DCCXXXI into a regular number?

    asked on October 1, 2007
  65. math

    how d you turn the roman numeral number DCCXXXI into a regular number?

    asked on October 1, 2007
  66. Chemistry

    Electrochemical Cells Out of platinum, iron, carbon and silver which would be the LEAST suitable as an electrode in a standard Fe3+/Fe2+ half cell, and why? Pt usually is the metal of choice for making measurements of this type, because of its inertness

    asked on July 30, 2007
  67. Chemistry

    If a colourless liquid with a pungent odour is added slowly to another colourless liquid, a dark brown precipitate is produced that later dissolves to produce a colourless solution. What are the two colourless liquids?

    asked on June 10, 2007
  68. Chemistry

    Does the reaction between CO2(g) + Mg(OH)2(aq) produce MgCO3(s) + H2O(l) or Mg(HCO3)2 ??? Normally, Mg(CO3)2 but I suspect an excess of CO2 will produce the bicarbonate. For example, CO2(g) + Ca(OH)2(aq) ==> CaCO3(s) + H2O(l) and that is often done by

    asked on May 31, 2007
  69. Chemistry

    I'm trying to work out the equation for when ammonia solution is added to zinc hydroxide solution. I think a precipitate forms. [Zn(OH)4]2- + NH3(aq) + H2O(l) --> ???? Zn(OH)2 + 4NH3 ==> Zn(NH3)4(OH)2 The Zn(OH)2 forms a soluble complex ion with NH3.

    asked on May 23, 2007
  70. Chemistry

    What sort of chemical test can be performed to identify from two unlabelled powders which one is zinc hydroxide and which one is aluminium hydroxide? Look up the determination of metals with dithizone. I believe Zn gives a colored complex when extracted

    asked on May 22, 2007
  71. Chemistry

    If a solution of Ca(OH)2 has a pH of 12.31 how can I calculate the concentration of calcium hydroxide in mol L-1 ? Write the dissociation equation: Ca(OH)2 >>Ca+ + 2OH So the concentration of the OH ion is twice the Ca(OH)2 . Find the concentration of the

    asked on May 21, 2007
  72. Chemistry

    If the hydrochloric acid is warm, is the following equation correct? 2HCl(aq) + Na2SO3 --> 2NaCl(aq) + SO2(g) + H2O(l) yes, correct.

    asked on May 20, 2007
  73. Chemistry

    How does one calculate the pH of a solution that is only 1.84% ionised? determine the concentration of the H+, which will be in a monoprotic acid, concentration * decimal percent. then determing pH in the normal way.

    asked on May 20, 2007
  74. Chemistry

    I have an assignment Q A 0.1 mol L-1 water solution of NH4CH3CO2 has a pH of approx 7. Explain this using two equations. I have one equation CH3COO-(aq) + H2O(l) --> CH3COOH(aq) + OH-(aq) What could the other equation be? NH4CH3CO2 is the salt of a weak

    asked on May 18, 2007
  75. Chemistry

    When asked to name all of the ions and molecules present in a 0.1 mol L-1 solution of CH3COOH, why are there OH- ions present if the equation is CH3COOH(aq) + H2O(l) --> CH3COO-(aq) + H3O+(aq) ? The water ionizes in such a manner that the product of the

    asked on May 12, 2007
  76. Chemistry

    1. What will happen if I add water to a FeSCN+2 solution? FeSCN+2(aq) + H2O(l) ???? 2. Will the equilibrium shift to the left or right? The FeCNS++ is red colored. I think adding water will simply dilute the red color. Won't it react in any way? Small

    asked on May 1, 2007
  77. Chemistry

    If the oxygen being fed into the system 4NH3(g) + 5O2(g) 4NO(g) + 6H20(g) + 950kJmol-1 is heated, how will the equilibrium shift? The reaction is exothermic, that is gives off heat, or raising the temperature. If heat is added, then the reaction will shift

    asked on May 1, 2007
  78. science

    sorry to annoy anyone, but WHAT is the big idea of energy? i would really appreiciate a response In what context? Too much use. Not reneewable? Cost? availability? in the context of an ironsulphide reaction I still don't understand the question. explaining

    asked on April 25, 2007
  79. algebra

    does log base of 4 sqrt(t/s)=1/2log base of 4 t - 1/2log base of 4s? sqrt=square root thanks yes yah thanks!

    asked on April 21, 2007
  80. algebra

    I know that 10^-2.3=5.0 * 10^-3 How do I get 10^-2.6 in the same form as 5.0 * 10^-3? please and thank you! Punch in 10 on your calculator, then press the yx button followed by -2.6 and then press equal. You should get 2.51E-3 thanks, but mine just says:

    asked on April 18, 2007
  81. Chemistry

    I have an assigment question that I need help with. The Q states that sodium hydroxide absorbs water from the atmosphere. Then the saturated NaOH absorbs carbon dioxide from the air to form a thin coating of sodium carbonate. A piece of sodium hydroxide

    asked on April 16, 2007
  82. Chemistry

    If barium nitrate solution is added to sodium hydroxide solution does a precipitate form? Are there exceptions? I have an assignment Q that asks about the precipitate, and I thought that Ba(OH)2 was soluble. Barium hydroxide is moderately soluble, up to

    asked on April 15, 2007
  83. chem

    For this problem, will someone please check my answer? How many grams of oxygen are produced in the decomposition of 5.00g of potassium chlorate? KClO3(s)--->KCl(s)+O2(g) [the equation may not be balanced] My answer is 1.96 g of O2. The balanced equation

    asked on March 22, 2007
  84. Maths

    John leaves point A to travel 360klm and Joanne leaves point A 40 mins later and her cars speed is 18klm per hour faster than John's but they both arrive at the same time. What is their respective speeds? The both travel the same distance.

    asked on March 21, 2007
  1. Physics

    skrek is my world

    posted on September 9, 2019
  2. Algebra

    Does anyone know the answers to the Unit 5 Lesson 10 quiz?

    posted on May 7, 2018
  3. math

    fgt gtf tfg ftg tgf gft

    posted on September 26, 2017
  4. math

    go gy gp gb gs og oy op ob os yg yo yp yb ys pg po py pb ps bg bo by bs sg so sy sp sb

    posted on September 26, 2017
  5. math

    fgt gtf tfg ftg tgf gft

    posted on September 26, 2017
  6. chemistry


    posted on September 19, 2017
  7. Math


    posted on April 13, 2017
  8. Algebra

    f(3)-g(3)=[(3)^2-13]-[11-(3)] =(9-13)-(11-3) =(-4)-(8) =-12

    posted on September 20, 2016
  9. Science

    It should be B. It is a type of Negative Feedback Loop

    posted on September 20, 2016
  10. chemistry

    Did you ever figure this out? I'm doing that assignment right now and don't get it

    posted on June 17, 2016
  11. Physics

    Can I ask what's the answer? Thankyou :)

    posted on March 16, 2016
  12. social studies

    Thanks for the help!

    posted on February 29, 2016
  13. tourism.geography.maths lit.history

    You can do social worker teaching jaurnalism laywer nurse also police

    posted on February 23, 2016
  14. tourism.geography.maths lit.history

    I wana be a social wor ker or a teacher is it possible with those subjects?

    posted on February 20, 2016
  15. Social Studies

    Ms. sue he means federal

    posted on November 12, 2015
  16. Algebra

    @ MathMate, Here is the original question; Write the equation of the line with slope -2 that passes through the point (-1, -3) in slope-intercept form. But I've tried to figure out how to do it and I'm literally stuck.

    posted on September 15, 2014