Popular questions and responses by Fidelia
  1. chem

    How do you balance this equation?: (NH4)2SO4+Ca(OH)2==>CaSO4+NH3+H20 Thanks! 2 NH3 2H2O Others are ones. (NH)2SO4 + Ca(OH)2 --> CaSO4+2NH3+2H2O Thanks!

    asked on March 22, 2007
  2. math

    5. A rubber ball dropped on a hard surface takes a sequence of bounces, each one 3/5 as high as the preceding one. If this ball is dropped from a height of 15 feet, what is the total distance it has traveled after it hits the surface the fifth time? The

    asked on May 31, 2007
  3. history

    When were US children required to go to school? The earliest compulsory education was in Massachusetts Colony in the 1640s. Thereafter each colony and state enacted its own required school attendance laws. By 1918, all states required children to at least

    asked on February 3, 2007
  4. algebra

    Okay, how do you factor a polynomial when there is a number in front of the highest x term. For example: how would you factor 2x^2-11x+15 i know the answer is (2x-5)(x-3), right? So you put the 2x on one side and then you put an x on the other. And then

    asked on May 15, 2007
  5. chem

    Although CHsubscript4 has 4 hydrogens, it is an acid. Why? It is NOT an acid. Did you make a typo or misread your notes/question? It isn't an acid because CH4 is not a proton donor. sorry, that's what i meant-why isn't it an acid?

    asked on May 14, 2007
  6. history

    The Korean War, Cold War, and Vietnam war were mainly about fighting communism. Would you say WWII was also? WW11 was not about Communism. I am not sure that Korea or Vietnam were about Communism either. The Chinese were not involved in the Korean war

    asked on April 8, 2007
  7. english

    Does this sentence make sense?: A highly informative book, Marc Aronson wrote Witch-Hunt Mysteries of the Salem Witch Trials. or does it make it seem as though Marc Aronson is the highly informative book (which he's not)? Thanks for the help! can u write

    asked on April 1, 2007
  8. algebra

    Can someone please tell me if I did this problem right? A new truck that sells for $29,000 depreciates 12% each year. Write a function that models the value of the truck. Find the value of the truck after 7 years. my answer=p(x)=price of truck ($)

    asked on March 29, 2007
  9. chemistry

    Can someone please check my work on this problem? That'd be great!: What is the balanced equation for the chemical change of adding Na2CO3 to CuCl2, therefore making CuCO3 form? CuCl2+Na2CO3-->CuCO3+2NaCl right thank you fill in the blanks! Nuclear

    asked on March 6, 2007
  10. chemistry

    Please, will someone help me balance this equation? There's always one element I just can't seem to balance. Cu+HNO3===>NO2+Cu(NO3)2+H20 Thanks for the help. Try this. Cu + 4HNO3 ==> 2NO2 + Cu(NO3)2 + 2H2O You're a genius! Do you think you could tell me

    asked on March 5, 2007
  11. chem

    Are aspirin, starch and dextrose covalent or ionic? Do aspirin and or epsom salt conduct electricity? Any help with these questions would be greatly appreciated. Thank you! I have been told by more than one person that aspirin often is sold as the sodium

    asked on February 1, 2007
  12. history

    Can someone please tell me some important dates in the US in the 1800s? Please and thank you.

    asked on January 28, 2007
  13. chemistry

    Can someone please help me with these? How many electrons would Nitrogen, Aluminum, and Bromine gain or lose? Look at the periodic table and find N, Al, and Br. You should find N in group VA (or 15 depending on the system being used), Al in IIIA (or 13),

    asked on January 23, 2007