1. Aboki

    Very Important Information

    if you want to test your knowledge of Chemistry or to improve your knowledge of Chemistry Download the mobile App Dula Treasure from the Samsung Galaxy App Store or Your favorite mobile App Store
  2. M

    Test Tomorrow Please Help!!!

    I am very confused on this question on my study guide. I would appreciate any help anyone can give! If you mix 9 moles of copper and 8 moles of nitric acid and produce 200 grams of copper (ii) nitrate, what is your percent yield?
  3. K

    Is there any simple test for air quality / components

    I'd like to prepare a simple test to check if the air flowing out from the air-conditioner contains any harmful materials / chemicals, or at least, if the air is pure outdoor air. The air -conditioner was probably handled with improper method by improper people. I'd like to know if there is any...
  4. F

    Really need this, its definitely on my test

    Got this question for my midterm, need to get it right. Only thing I think I know is that I should convert the number of atoms to moles using Avagadros number. Heres the problem: A 67.2 sample of gold (196.97g/mol) and palladium (106.42g/mol) contains 2.49x10^23 atoms. What is the composition...
  5. A

    Soil Test Kit.

    How would I make up a soil test kit to test my garden soil for the common elemental deficiencies? A complete kit would be able to test for: Primary elements: nitrogen, phosphorus, potassium Secondary: calcium, magnesium, sulphur Minor: boron, copper, iron, manganese, molybdenum, zinc.
  6. P

    Test for Avogadro's hypothesis

    I took a piece of charcoal from my fireplace, fired it up over a burner to get it red hot, dropped it into a glass, and quickly covered the top of the glass tightly with a piece of plastic wrap. My expectation was that, if carbon monoxide was produced, each oxygen molecule to be replaced by two...
  7. F

    Test Retake Help (chem 2)

    Using kp to find pressure after a system has reached equilibrium At 250C, the equilibrium constant Kp for the reaction PCl5(g) <--> PCl3(g) + Cl2(g) is 1.80. Sufficient PCl5 is put into a reaction vessel to give an initial pressure of 2.74 atm at 250C. Calculate the pressure of PCl5 after the...