When performing an experiment, should you reflect on results throughout the lab? why/why not?

The percent efficiency of a machine can never be 100% (or greater), because in the real world some energy is always converted into a. heat b. work c. input force d. output force

In a given chemical reaction, the energy of the products is greater than the energy of the reactants. which statement is true for this reaction?

Idon’t quite understand this problem