This artwork took six colors to complete. Initially, the chalk used had a mass of 323.5 grams but upon completion, it's mass had dropped to 301.2 grams. What is the change in mass?

If a solution is considered basic, then a) the hydroxide ion and hydronium ion concentrations are equal. b) the hydroxide ion concentration is less than the hydronium ion concentration. c) the hydronium ion concentration is greater than the hydroxide ion concentration. d) the hydroxide ion concentration is greater than the hydronium ion concentration.

Match the mixture with the substance// i really need on this guys (it’s a pic btw)

How do you identify the anode on a power source such as a battery? how do you identify the cathode? how are terms anion and cation?