Open-ended question: differentiate between a solution and a two phase mixture. brass is would be classified as which one of them? which would you classify a salad as?

In a water molecule, hydrogen and oxygen are held together by a(an) bond. a) double covalent b) ionic c) nonpolar covalent d) hydrogen e) polar covalent

If anyone would be able to me out with these three questions it would be these are from the chem 2202 course.

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.