Help! How do I study for AP Chemistry?! I’m struggling because my test avg is a 66.6% and I’m doing well on labs and quizzes... does anyone have good study resources?!

What is the chemical formula of the following compound

Calcium chloride +gold(1) oxide—>

Which buffer would be better able to hold a steady ph on the addition of strong acid, buffer 1 or buffer 2? explain. buffer 1: a solution containing 0.10 m nh4cl and 1 m nh3. buffer 2: a solution containing 1 m nh4cl and 0.10 m nh3