Most popular questions and responses by Doreen
  1. chemistry

    water has one of the largest specific heats of any substance. why is it important for human body?

    asked on March 19, 2012
  2. chemistry

    Why is a measured amount of water needed to determine the specific heat of a metal object?

    asked on March 17, 2012
  3. Chemistry

    Carbonates react with acids to form a salt, water and carbon dioxide gas. When 22.1 g of calcium carbonate are reacted with sufficient hydrochloric acid, how many grams of calcium chloride will be produced?

    asked on February 28, 2014
  4. none

    i can be long or short, i can be grown or bought, i can be painted or left bare, my tip can be round or square

    asked on January 27, 2017
  5. algebra

    Express the statement as a formula that involves the variables w, z, u and a constant of proportionality k, and then determine the value of k from the condition : w varies directly as z and inversely as the square root of u, if z = 3 and u = 4, then w = 18

    asked on March 30, 2014
  6. Chemistry

    Write the mole ratio for Al+3 ion and CO3-2 ion in this equation, 2Al(NO3)3 + 3Na2CO3 = Al2(CO3)3 + 6NaNO3

    asked on March 23, 2012
  7. chemistry

    why does a sodium street lamp give off a different color light than a neon light?

    asked on February 29, 2012
  8. History

    how does the infusion of african,european and indigenous cultures reflect itself in the americas?

    asked on November 17, 2010
  9. 11th grade,physical science

    what are the advantages and disadvantages of chlorine? what is chlorine?

    asked on July 15, 2010
  10. Math

    6 years from now , the sum of the ages of Megie and Vince is equal to 18. Four years from now, twice Vince age is equal to Megie's age plud 26

    asked on December 18, 2012
  11. chemistry

    how does the number of electron pairs around a central atom determines its shape

    asked on March 17, 2012
  12. chemistry

    What is the color of a neon light?

    asked on February 29, 2012
  1. physics

    not sure

    posted on December 4, 2017
  2. none

    thank you

    posted on January 27, 2017
  3. Finance


    posted on July 23, 2016
  4. Law and Ethics

    I am also with Penn Foster doing the med billing/coding program. Just starting this paper and it looks like it will be a hard one. You guys have given me soon good advice. Thank you.

    posted on January 17, 2009
  5. Help ASAP

    Compute the present value of a $100 cash flow for the following combinations of discount rates and times: r = 8 percent, t = 10 years.

    posted on March 7, 2008