Bert

Most popular questions and responses by Bert
  1. Organic Chemistry

    HCl is added to t-pentyl alcohol in a vial to synthesize t-pentyl chloride. t-pentyl chloride separates on top and the bottom layer is discarded. Sodium bicarbonate is then used to wash the crude t-pentyl chloride. What is the purpose of this wash and why

    asked on July 7, 2008
  2. Physics

    Suppose you are told that only two colors of light (X and Y) are sent through a glass prism and that X is bent more than Y. Which color travels more slowly in the prism? The one that is bent more travels slower. If white light is sent through a prism, the

    asked on March 14, 2007
  3. Organic Chemistry

    What major product is formed by the dehydration of 1,2-cyclohexanediol (consider keto-enol tautomerism)?

    asked on July 10, 2008
  4. chemisty

    Consider the titration of 50 mL of 0.15 M NH3 with 0.1 M HCl. What is the pH at the equivalence point of the titration? (Kb= 1.8X 10-5 Ka= 5.6X10-10)

    asked on December 7, 2007
  5. Statistics

    10. A teacher gives 200 students a study guide for a test and the average score was 90 with a standard deviation of 6. She did not give the other 200 students a study guide and their average score was 70 with a standard deviation of 8. Find the critical

    asked on November 11, 2015
  6. Statistics

    10. A teacher gives 200 students a study guide for a test and the average score was 90 with a standard deviation of 6. She did not give the other 200 students a study guide and their average score was 70 with a standard deviation of 8. Find the critical

    asked on November 11, 2015
  7. physics

    a uniform beam with a weight of 51.3 N and a length of 3.23 m is hinged at its lower end, and a horizontal force Upper F Overscript right-arrow EndScripts of magnitude 64.0 N acts at its upper end. The beam is held vertical by a cable that makes angle θ =

    asked on May 8, 2016
  8. Chemistry

    If 100mL of a 0.10M NaOH solution is added to 75mL of a 0.15 HCl solution, then what is the pH of the resultant solution?

    asked on August 22, 2007
  9. Physics

    If a solid glass cylinder is placed above the words Lead Oxide (Lead in red print and Oxide in blue) and viewed from the side, the word Lead appears inverted, but the word Oxide does not. Explain. What part of the cylinder is on top of the letters? From

    asked on March 29, 2007
  10. Statistics

    When circuit boards used in the manufacture of compact disc players are tested, it is discovered that each has a 5% chance of being defective. Suppose that a batch of 25 of these circuit boards is randomly selected. Would this be binomial or poission

    asked on September 25, 2009
  11. Cell Biology

    What is the theoretical limit of resolution in micrometers when there is a numerical aperture (N.A) of 0.10, 500nm wavelength, and 4X magnification?

    asked on August 26, 2008
  12. Chemistry

    50 ml of 5 M H2SO4 react with excess BaCl2 to Make 40 g of BaSO4. a.) What is the theoretical yield of BaSO4? b.) What is the Percentage yield of BaSO4

    asked on November 4, 2010
  13. Organic Chem

    NaCl was used to rinse a condenser after distillation of 4-methylcyclohexene to remove unreacted phosphoric acid. Why is saturated NaCl used to rinse the glassware rather than water?

    asked on July 10, 2008
  14. Chemistry

    A certain shade of blue had a frequency of 1.01*10^-4 Hz. What is the energy of exactly one photon of this light?

    asked on March 20, 2011
  15. Science

    A 500 mL bottle of water, which is at 25 degrees C, is poured over 120 g of ice at -8 degrees C. What will be the final temperature of the water when all the ice has melted. Assume that container is insulated and does not change temperature.

    asked on January 20, 2010
  16. MATH!!!!!!!

    The river boat paddled upstream at 12km/h, stopped for 2 h of sightseeing, and paddled back at 18km/h. How far upstream did the boat travel if the total time for the trip, including the stop, was 7h? Please help me, the answer is 36 km but i have no idea

    asked on January 8, 2008
  17. History

    What was the relationship between church and state during the 16th Protestent Reformation?

    asked on August 26, 2007
  18. Physics

    If the critical frequency of a low-pass filter is 5 kHz, what is the filter bandwidth?

    asked on April 5, 2012
  19. Physics

    If the two input voltages to a 2-input summing amplifier are +2 V and +5 V, what is the output voltage?

    asked on April 4, 2012
  20. Science

    A 500 mL bottle of water, which is at 25 degrees C, is poured over 120 g of ice at -8 degrees C. What will be the final temperature of the water when all the ice has melted. Assume that container is insulated and does not change temperature.

    asked on January 21, 2010
  21. differential geometry

    given a circle in S^2 with radius p in the spherical metric, show its area is 2pi(1-cos p)

    asked on May 4, 2009
  22. History

    During the 16th century protestent reformation, what was the relationship between the church and state? http://en.wikipedia.org/wiki/Protestant_reformation Let us know what you conclude, and someone here will be able to critique your thinking. =)

    asked on August 20, 2007
  23. Physics

    Two cars are parked on a street. A third car hits the back of the second car and causes all of the cars to move. (Ignore the distance between the cars). Calculate: (a)The acceleration of the whole system; (b)the net force on each car; (c)the contact force

    asked on March 14, 2014
  24. Physics

    A mountain climber dangles his water bottle and feels the bottle makes an angle of 25 degrees with respect to the vertical line. If his acceleration takes 18 seconds, calculate the speed of the climber.

    asked on March 14, 2014
  25. math

    Together, Misty and Keith caught 29 fish. Keith caught 5 fewer fish than Misty. How many did they each catch?

    asked on October 10, 2012
  26. Science

    Is the answer 26 celsius? Is it possible that the temp is greater than 25 celsius? A 500 mL bottle of water, which is at 25 degrees C, is poured over 120 g of ice at -8 degrees C. What will be the final temperature of the water when all the ice has melted.

    asked on January 21, 2010
  27. Math

    The numbers are 45 and 7, how do you calculate the ratio?

    asked on August 30, 2007
  1. Algrebra-Systems of Equations

    54

    posted on February 20, 2017
  2. physics

    36.75

    posted on February 5, 2017
  3. Math

    $20

    posted on January 4, 2017
  4. math

    Write to least to greatest. 45/6, 7 1/3 , 7, 4

    posted on November 17, 2015
  5. Science

    Does c in the equation stand for temperature in celsius?

    posted on January 21, 2010
  6. Science

    Does c stand for temperature in celsius?

    posted on January 21, 2010
  7. Science

    What do Tf and Hf stand for? Are they constants? Also, is Tf different from tf?

    posted on January 20, 2010
  8. bio

    Transformation efficiency = (Total number of cells growing on the agar plate) / (Amount of DNA spread on the agar plate (in µg)). So if the transformation efficiency is 4 x 10^3 and the amount of plasmid on the plate is 0.04 micrograms, then: 4 x 10^3 = x

    posted on April 21, 2009
  9. History

    Could it be described as the state taking total control over the church by determining how the church will function? I was thinking that after the Roman Empire established Christianity the primary religion that the state was able to over-rule and control

    posted on August 26, 2007
  10. Chemistry

    I don't understand where the H+ comes from, I mean I know it comes from the acid, but don't I need an equilibrium constant K to solve for the H+?

    posted on August 22, 2007