Is he fine?
yes or no? :)

What is the mass of 4 molecules of co2

12. calculate the hydroxide ion concentration of a solution with ph = 3.25. show all calculations leading to an answer

Which statement is true about a catalyst? a: a catalyst decreases the rate of the reaction. b. a catalyst is consumed during a chemical reaction. c. a catalyst lowers the activation energy of a reaction. d. a catalyst increases the reactant concentration during a reaction.