Evidence that a chemical change has occurred includes a .

a. change in state
b. change in size
c. change in shape
d. change in color

An oven's high temperature speeds up chemical reactions because heat .

a. lowers the activation energy
b. activates catalysts
c. makes more molecules collide with each other
d. reduces the particle size of the reactants

< > according to newton's third law of motion, forces always act in equal but opposite pairs. another way of saying this is for every action, there is an equal but opposite reaction.< >

can you attach the

definition

                    entropy is a measure of the randomness or the extent of disorder of a chemical process.

                      enthalpy is a measure of the heat change of a reaction occurring at a constant pressure.

measurement units:

                        entropy is measured in joule per kelvin (jk⁻¹)   whereas enthalpy is measured in joule per mole (jmol⁻¹)

requirements:

                            entropy has no requirements or limits, and its change is measured by the division between the heat change of the chemical process and the temperature.

                              in contrast, enthalpy can only be related to the heat change of the reaction under standard conditions.