Select all that apply. When the products of a reaction have a lower enthalpy than the reactants .
[ ] The reaction is endothermic.
[ ] The reaction is exothermic.
[ ] The change in enthalpy is positive.
[ ] The reactants lost internal energy.

Solar energy is energy from the sun that is converted into thermal or energy. a. nuclear b. mechanical c. electrical d. chemical

Melissa is interested in her family tree and how her family has changed over its many generations. melissa probably more closely resembles

You are attempting to recrystallize a crude product mixture. you add the appropriate amount of hot solvent and are allowing the solution to slowly cool to room temperature. however, at room temperature no crystals have appeared, which of the following methods should be used to induce crystallization? choose all correct answers. a) place the flask in an ice bath. b) swirl the contents of the flask. c) add a small seed crystal of the desired product. d) scratch the inside of the glassware using a stir rod. it can be multiple choices