Wednesday
November 26, 2014

Posts by kathleen


Total # Posts: 122

Chemistry
What are the common molecular shapes around the carbons?
March 29, 2010

Chemistry
4. Write the balanced equation for CH4+Cl2„_CH2Cl2+HCl. 5. Using the equation in problem 4 if 6.00 g of CH4 are mixed with 6.00 g of CL2, how much HCl can be made? What is the percent yield if 2.5 g are recovered from the reaction in the lab?
March 28, 2010

Chemistry
What is the importance of a freezing point depression graph and why and what things change when different solutes and solvents are added?
March 25, 2010

Algebra
The numbers are represented by x, x+1 and X+2. X^2 + (X+1)^2=(X+2)^2 X^2 + X^2 +2X +1=X^2 +4X + 4 2X^2+2X+1=X^2+4X+4 X^2-2X-3=0 (X-3)(X+1)=0 X=3 X=-1 The numbers are X=3, X+1=4 X+2=5 Check: 3^2 + 4^2=5^2 9+16=25 A second solution is X=-1 X=0 X=1 -1^2 + 0^2=1^2 1+0=1
March 24, 2010

algebra
Divide 7 by 12 to get the decimal. 7/12=0.5833 (3 repeating) Multiply by 100 to get percent. 58.33% (3 repeating)
March 24, 2010

Chemistry
THANKS!
March 24, 2010

Chemistry
Thanks! So the antifreeze one doesn't have anything to do with vapor pressure?
March 24, 2010

Chemistry
What colligative properties are displayed by these situations. 1. Antifreeze is added to car cooling system preventing freezing when air temp is below 0 degrees C. 2. Ice melts on sidewalk after salt has been spread
March 24, 2010

algebra
X^-6 times X^5= X^-1 (add exponents -6 + 5=-1 X to the negative 1 can be rewritten 1/X so you have only postitve exponents. Y^-12 divided by Y^5 = Y^-17 (subtract exponents -12-5=-17) So Y^-17=1/Y^17
March 24, 2010

Science
The half life of carbon 14 is 5700 years. So If a fossil is 5700 years old then half of the carbon-14 is left.
March 24, 2010

Algebra
what is the solution to 2(-5y cubed)squared + (-3ycubed)cubed
February 20, 2010

Child care
#. additional space for children could provide in classoom 3 with the additional of A. a closet B. counters and storage underneath c.cubbies D. a loft
November 16, 2009

social studies
Why does the President as commander-in-chief of the armed forces?
November 3, 2009

science
What is one animal that lives in the rainforest and what is it's adaptation?
October 20, 2009

science
I guess I'm missing something here...but I've approached this question in every possible angle and im just not getting it! Could somebody point me in the right direction? Here is the question: If the measured net radiation (Q*) for the lawn of your home in August is ...
October 1, 2009

science
what is faster panther or cardinal
January 10, 2009

spelling
Umm... Maybe: She's going to buy him a present, but can't decide what to get him. Maybe something along those lines? I don't know if that works or not.
December 16, 2008

Math
Divide: 4 1/5 / 14
August 18, 2008

Math
Multiply: (7.6)(1)(6)
August 16, 2008

Alegebra II
if 3ãx6 + 3ã8x3 + 3ã1 = 0, then x= (A) -1 (B) 0 (C) 1 (D) 2 (E) 3
October 16, 2007

science
name each ion 1. As3- 2. Ca2+ 3. H- Since this is not my area of expertise, I searched Google under the key words "H- ion", As3- ion" (Sure you don't mean "+"?) and Ca2+ ion" to get these possible sources: http://www.h-minus-ion.org/ http://...
April 25, 2007

5th Grade Math
I cannot get my brain around questions like this: 1/4 divided by 2/5 = 2/4 x ? I have 4 problems like this and even the example doesn't make sense - I may have copied it wrong off of the board. Can anyone help? Thank you! You invert the second fraction and then just ...
April 23, 2007

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