Most popular questions and responses by kelsy
  1. Chemistry

    I would like to check my answer to the following question: The permanganate ion oxidizes bromide in acidic conditions to form bromine, manganese(II) ion and water. Give the balanced equation of the reaction. My answer: 3e- + 8H+ (aq) + MnO4- (aq) + 2Br-

    asked on May 18, 2015
  2. chemistry-bond energies

    Octane (C8H18) is the main hydrocarbon in gasoline. Using bond energies, calculate the amount of energy produced from 2.5 kilograms of octane. I know how to do bond energies, but If someone could tell me what to do with the 2.5 kg in this case and possibly

    asked on October 10, 2010
  3. geometry

    State the negation of the following statement: The sun is not shining.

    asked on February 22, 2010
  4. chemistry

    If 1.00 mol of iodine and 0.50 mol of chlorine are initially placed into a 2.00 L reaction vessel at 25 degrees celsius, find the concentrations of all entities at equilibrium

    asked on April 7, 2008
  5. chemistry

    Hy Dr Bob222 this will be the last time I will bother you about this type of question. Can you please tell what I am doing wrong? This is the best answer I could come up with: Question: Strychnine, C21H22N2O2(aq) is a weak base but a powerful poison.

    asked on April 8, 2008
  6. Chemistry

    I need to calculate the amount of NaH2PO4 (in grams) and 1.00M NaOH solution (in ml) needed to make 250 ml of 0.20M H2PO4- at pH 8.00. My work is lengthy and involved but the answer I got was 7.00 ml of the NaOH and 0.0070 moles of the NaH2PO4 needed. Can

    asked on May 12, 2015
  7. english

    In which sentence are the conjunctions used correctly? A. The top award was given to neither Steve or Jim. B. Either Fred nor John knew about the accident. C. Mary enjoyed neither roller skating or ice skating. D. Neither beauty nor popularity was

    asked on March 21, 2014
  8. english

    edit the following sentence with pronoun case:"the shower of sinking bricks caused he and his diving partner to race away from the collapsing seawell."

    asked on October 14, 2010
  9. factor label method (chem)

    The density of mercury metal is 13.6 g/mL. what is the mass of 3.55 mL of the metal? i don't know where to begin on this question

    asked on February 7, 2010
  10. math

    Find the perimeter of a right triangle with legs of 20 cm, and 21 cm. a.882 b.82 c.70 d.47 I have no clue what to do. Can somebody help me with this please?

    asked on August 30, 2008
  11. math

    ms.smith has a new fish aquarium that measures 45.3 cm long, 23.4 cm wide and 28 cm high. She has had a problem with the fish jumping out of the tank. today she is cleaning and decides to fill the tank to a level that is 4cm from the top to see if that

    asked on October 22, 2007
  12. Physics Due Tonight Help!!!!!

    The Martian moon Phobos travels once around the planet Mars every 7 hours and 39 minutes. What is the angular velocity of Phobos in radians/second?

    asked on October 30, 2017
  13. Chemistry

    I need to calculate the amount of NaH2PO4 (in grams) and 1.00M NaOH solution (in ml) needed to make 250 ml of 0.20M H2PO4- at pH 8.00. My work is lengthy and involved but the answer I got was 7.00 ml of the NaOH and 0.0070 moles of the NaH2PO4 needed. Can

    asked on May 12, 2015
  14. science

    What force is needed to move a 200.00 neuton chair 1.7 meter?

    asked on September 29, 2012
  15. chemistry

    Are molecules with double bonds hard to break apart? if so why/why not

    asked on June 1, 2010

    How do you balance this equation? does the dot before the 6 mean something MgSO4˙6H2O = MgSO4 + H2O

    asked on May 18, 2010
  17. math

    i need to factor 2x²-x-6

    asked on February 21, 2009
  1. Maths


    posted on August 31, 2017
  2. Science - Please Check My Written Answer

    There are several reasons that experiments with faulty designs or with inconsistent data are problematic for scientists. A person can make one of those problems if he or she were to poorly measure what they are studying. For example, someone measured the

    posted on June 30, 2016
  3. math

    Tanyas heart beats 68 times per minute how many times does it beat in one hour

    posted on November 10, 2015
  4. Chemistry

    Yes. Thank you. I totally forgot to multiply the half reactions after balancing them. Lame. I appreciate the help.

    posted on May 19, 2015
  5. Chemistry

    We overlapped. Yes I got it. Thank you.

    posted on May 18, 2015
  6. Chemistry

    Ooops I left some out: 16H+ + 2MnO4- + 10 Br- ---> 5 Br2 + 2Mn 2+ + 8H2O :) Is this it???

    posted on May 18, 2015
  7. Chemistry

    I think I have it... 10e- + 16H+ + 2MnO4- + 10 Br- ---> 5 Br2 + 8H2O + 10 e- Now remove the 10e- from both sides: 16H+ + 2MnO4- + 10 Br- ---> 5 Br2 + 8H2O

    posted on May 18, 2015
  8. Chemistry

    I'm lost. I really don't see what I am missing in this.

    posted on May 18, 2015
  9. Chemistry

    No, that won't work.

    posted on May 18, 2015
  10. Chemistry

    Should I use H3O+ rather than H+?

    posted on May 18, 2015
  11. Chemistry

    Thanks on the arrow. I don't know. In acid solutions I need the H+ ions. Charges have to balance. I balanced using the oxidation states of each species. I did half reactions. Perhaps the water is messing me up.

    posted on May 18, 2015
  12. Chemistry

    Could you show me how you got it? I'm not sure what I did wrong.

    posted on May 14, 2015
  13. Chemistry

    Can you suggest a different pka or what I might have done wrong? I got a pka of 7.2 by using pKa = -log(Ka) and Ka for H2PO4- is 6.3e10^-8. I know that a pKa of 7 will yield a buffer in the range of 6.2 to 8.2. I calculated I needed 6.1 g of the NaH2PO4

    posted on May 12, 2015
  14. Chemistry

    Hmmm, ok. True. Ok I will try again. Thank you.

    posted on May 12, 2015
  15. Chemistry


    posted on May 12, 2015
  16. Physics

    Light travels approximately 982,080,000 ft/s, and one year has approximately 32,000,000 seconds. A light year is the distance light travels in one year. State the speed in mi/s, using scientific notation. (1 mile = 5280 feet exactly, by definition; i.e.,

    posted on April 23, 2015
  17. pyshc101

    It sounds to me like the calming reaction would be due to her parasympathetic nervous system, as she was originally in fight or flight mode and had a sympathetic nervous system reaction.

    posted on October 28, 2012
  18. English- Figurative Language

    It seems to me that it is a hyperbole (exaggeration )

    posted on March 11, 2012
  19. Algebra

    x=-7 and x=-4 x+7=0 and x+4=0 (x+7)(x+4) = x^2 + 4x + 7x +28 the equation would be x^2 + 11x + 28

    posted on May 24, 2011
  20. Math

    y= 587,000(0.88)^x so.. y= 587,000(0.88)^10 y=587000 x 0.278500976 y=163480.0729

    posted on May 24, 2011
  21. Science

    This would be the cell membrane or in a plant cell, the cell wall.

    posted on May 24, 2011
  22. Chemistry

    based on differences in their boiling points.

    posted on April 13, 2009
  23. chemistry

    No Sir, thank you :)

    posted on April 8, 2008
  24. chemistry

    I get 4.0 x 10^-3 but im incorrect

    posted on April 8, 2008