6.4 Energy

Question 1

Kinetic energy vs potential energy

Answer 1

Energy of motion vs stored energy

Question 2

How is energy related to the process of breaking bonds?

Answer 2

Requires energy to break bond, then releases energy.
Endothermic: The bond breaking process in reactants requires more energy than is released in total. Energy from an external source must be absorbed.

Question 3

Exothermic vs endothermic

Answer 3

Exo: less energy is absorbed than released
Endo: more energy is absorbed than released

Question 4

Energy in chemical reactions is measured in __

Answer 4

Kilojoules (kJ)

Question 5

Open system define

Answer 5

Both energy and matter can flow in/out of the system

Question 6

Closed system define

Answer 6

The reactants r closed to the surrounding environment, allowing the transfer of energy in/out excluding the transfer of matter.

Question 7

Enthalpy define

Answer 7

Measure of the total internal energy (KE and PE) of a system under constant pressure. Depends on the states of the products/reactants.