NEED HELP ASAP!! (08.05 MC)
What is the hydronium ion concentration of a solution with a POH of 6.90?
O 6.29 x 10-7 M
06.53 x 10-7 M
07.18 x 10-8 M
O 7.94 x 10-8 M

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.

If 3 moles of a compound use 24 j of energy in a reaction, what is the a hreaction in j/mol?

Structure of the atoms: discovery of the nucleus in 1909i need answering all of these questions