How could you show that dissolving salt in water is a physical change?

The drawing represents the movement of particles in a substance. what changes of state can this substance undergo

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.

Is 343 in the sequence -5, -2, 1, 4, 7