Friday
December 6, 2013

# Posts by Zach

Total # Posts: 294

Organic Chemistry
Melting Point Determinations between urea and trans-cinnamic acid. Q. If urea were a significant base, specifically how would your Melting Point Diagram be different?

math
P(t) = 1000 - 19.75t + 20t² - 1/3t³, what type of function is it?

Chemistry
How would I find the percent of water lost in alum after it has dried for a week? Wet Alum = 13.44g Dry Alum = 11.28g

math
Chris has a 3 1/2 foot long board. He cuts out 4 pieces that are each 2/3 foot long. Find the combined length of the 4 pieces? Find length of the remaining board after chris gets his 4 pieces?

English
The complete subject is, Many stories about the first Valentine's day. The simple subject is stories.

English
What is the simple subject of ,Many stories about the first Valentine's Day exist?

math
one carton of juice is 10cm wide by 10 cm long. how many cartons of juice will fit on a refrigerator shelf that is 80 cm wide by 100 cm long?

Chemistry
How would I calculate the heat of solution in Joules for dissolving 0.1 mole of NH4NO3 in 100 mL of water? The initial temperature was 22.8 degrees celsius and the temperature after the salt dissolved was 18.1 degrees celsius.

Chemistry
Oh ok and I used a device called a Xplorer GLX and it measured the pressure of the flask before I put in the magnesium and hydrochloric acid and then it measured the pressure once the reaction was complete. But thank you for all of your help!

Chemistry
In the lab I had a strip of magnesium that weighed 0.029 grams and I added 15 milliliters of 0.5 M hydrochloric acid into a flask and I never used any water during the lab. So I don't really understand where I would get the water vapor pressure.

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