Which ray shows the correct direction of the reflected ray? 1 2 3 4

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.

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

What is the formula of the ionic compound composed of calcium cations and chloride anions