Que es el cambio de energía

To find the enthalpy of a reaction in the lab, you measured the of the reactants and the change during the reaction.

In which region is the substance in both the solid phase and the liquid phase? 1 2. 3 4 mark this and return save and exit next

What is a substance? a. a physical property of matter b. a chemical property of matter c. an element or compound that cannot be physically separated d. characteristics used to tell the difference between mixtures