which compound likely has a higher melting point, aluminum trichloride, AlCl3, or phosphorus trichloride, PCl3?

i'm not sure

explanation:

i'll try whatever you got

answer: enthalpy

explanation:

for a exothermic reaction, the energy is released i.e. the energy of the products is lower than the energy of the reactants.

= enthaply

= energy of products

= energy of reactants

as , thus comes out to be negative. negative value of enthalpy shows that the reaction is exothermic.

"record the time to complete a chemical reaction" would most likely be part of a lab procedure.

the answer is barium and copper bromide