What are the final hydrogen ion concentration and pH of a solution obtained by mixing 200 ml of 0.4 M aqueous NH3 with 300 ml of 0.2 M HCl? (Kb=1.8x10-5)

1) how many electrons are in each energy level of the following elements? a. he b. na c. na d. ne 2) how many valence electrons are percent in the following atoms? a. s b. mg c. be d. cl 3) which of the following elements are stable as atoms? a. he b. o c. cl d. ar if you are able to provide the work as to how you got the answers that would be greatly appreciated. : )

If the same amount of cacl2 is added to equal volumes of water and maple syrup, which will have the higher temperature?

Flourine is found to undergo 10% radioactivity decay in 366 minutes determine its halflife