Popular questions and responses by samm
  1. chemistry

    The half-equivalence point of a titration occurs half way to the end point, where half of the analyte has reacted to form its conjugate, and the other half still remains unreacted. If 0.220 moles of a monoprotic weak acid (Ka = 3.7 × 10-5) is titrated

    asked on November 13, 2013
  2. physics

    A firecracker in a coconut blows the coconut into three pieces. Two pieces of equal mass fly off south and west, perpendicular to each other, at 21m/s . The third piece has twice the mass as the other two. What is the speed of the third piece? What is the

    asked on November 10, 2013
  3. College Chemistry 104

    A voltaic cell consists of a Pb/Pb2+ half-cell and a Cu/Cu2+ half-cell at 25 C. The initial concentrations of Pb+2 and Cu+2 are 0.0500 M and 1.50 M, respectively. A. What is the initial cell potential? B. What is the cell potential when the concentration

    asked on May 7, 2013
  4. chemistry

    Consider 15 mL of an aqueous solution containing 2.0 g of an organic solute. If the distribution coefficient for the solute between ether and water is 20, calculate the percent of the compound that can be recovered with a single extraction with 13.9 mL of

    asked on November 24, 2013
  5. physics

    A convex lens with a focal length of 20 cm is placed in front of a convex mirror with a focal length of 7.5 cm. A luminous object is placed in front of the convex lens at a distance of 40 cm from it. What is the distance between the mirror and the lens to

    asked on October 5, 2016
  6. Chemistry

    A voltaic cell consists of a Pb/Pb2+ half-cell and a Cu/Cu2+ half-cell at 25 C. The initial concentrations of Pb+2 and Cu+2 are 0.0500 M and 1.50 M, respectively. A. What is the initial cell potential? B. What is the cell potential when the concentration

    asked on May 7, 2013
  7. science

    Which of the following space objects are you most likely to find in the designated area between Mars and Jupiter? A. moons B. comets C. asteroids D. meteors

    asked on October 7, 2019
  8. physics

    a small piece of wire bent into L shape with upright and horizontal positiions of equal lengths, is placed with horizontal position along axis of concave mirrror whose radius of curvature is 10cm. If bend is 20cm from pole of mirror, then ratio of lengths

    asked on September 8, 2016
  9. General Chemistry

    Methanol is produced as the sole product of the combination of carbon monoxide gas and hydrogen gas. If 3.12X103 kg of methanol are actually produced, what is the precent yield if you start with 430.0 kg of hydrogen gas?

    asked on February 21, 2011
  10. chemistry

    500.0 mL of 0.140 M NaOH is added to 625 mL of 0.200 M weak acid (Ka = 1.37 × 10-5). What is the pH of the resulting buffer?

    asked on November 13, 2013
  11. college

    18.0 grams of oxygen is reacted with nitrogen to make 56.0 grams of nitrogen dioxide according to the following reaction: 2O2 + N2 ---> 2 NO2 How much nitrogen (in grams) reacted?

    asked on November 19, 2010
  12. chemistry

    how many totsl moles of ions are released when 0.83 mol of K3PO4 dissolves in water?

    asked on October 28, 2009
  13. geometry

    ughh i need help i dnt like proofs we'll here it the instructions write a two column proof the segment addition postulate is useful for this proof also. remember that the transitive && substitution properties are common in proofs this one requires

    asked on September 24, 2009
  14. chemistry

    how much heat is released when 5.60 moles of NaOH is dissolved in water?

    asked on April 14, 2011
  15. Digit Problems

    If the tens digit of a two-digit number is subtracted from the units digit, the difference is 8. The number with the digits reversed is 10 more than nine times the units digit of the original number. Find the number.

    asked on February 1, 2011
  16. Physics HELP!

    A 85.0 kg base runner begins his slide into second base when he is moving at a speed of 2.10 m/s. The coefficient of friction between his clothes and Earth is 0.570. He slides so that his speed is zero just as he reaches the base. (a) How much mechanical

    asked on October 5, 2012
  17. chemistry

    ok so you have 1.76g of salicyic acid(138.12 g/mol) and with 1.11 g of acetic anhydride(102.10 g/mol) a student obtained 1.12g of acetylsalicylic acid( 180.17 g/mol) what is the percentage yield?

    asked on November 17, 2013
  18. adv functions

    joe is building a wooden cylindrical storage box. the box will have a volume og 6pi m^3. for design purposes, the thick wood for the top and the bottom costs $6/m^2 and the thinner wood for the sides cost $5/m^2. a)express the cost of the wood as a

    asked on October 27, 2015
  19. English

    hi im sam :p i have 8th grade math and i think like yesterday we got an assesment called circle sentencing and im completly confused i even asked my princble and she couldn't even help..:( i have a link to show what my homework is but it wont let me post

    asked on September 8, 2011
  20. third grade social studies

    what is a capital resource? Something that can be used to make goods or services. I need information on government representatives, and senetors who is he the body of water that the romans depended on for trading and traveling.

    asked on September 26, 2006
  21. ETH125

    Did Hungarians face prejudice, segregation, racism, or any combination of the three?

    asked on October 20, 2011
  22. physics

    a particle which has zero rest mass and non zero energy and momentum must travel with a speed?

    asked on October 6, 2016
  23. Chem

    Calculate the number of grams in each of the following. (3 s.f.) 19. 0.550 mol Au ________________________

    asked on November 21, 2010
  24. ETH125

    Did African Americans go through annexation?

    asked on October 8, 2011
  1. math

    The answer is 67

    posted on July 18, 2019
  2. adv functions

    this is what i got: cost=6*2PIr^2+5*2PIr*h = 12PIr^2 + 10PIr*h = 12PIr^2 + 10PIr*(6/r^2) = 12PIr^2 + (60PI)/r

    posted on October 27, 2015
  3. adv functions

    can you please explain how you got these equations?

    posted on October 27, 2015


    posted on March 9, 2012
  5. ETH125

    Any time in american history? I know they immigrated but as far as i have read i do not think they suffered any of the three. Do you know any good websites i could look up with a lot of information on hungarian history.

    posted on October 20, 2011
  6. English

    thxs :D i hope i don't do it wrong by accient :o then my princble will probebly make me do my h.w. in her office for the rest uv the year again :o

    posted on September 8, 2011
  7. English

    yes that is the website

    posted on September 8, 2011