Energy + Chemical bonds

all chemical reactions require

energy and we aquire that by eating food

how does extracting energy from food work

we break down larger molecules into smaller ones (digestion) which allows us to extract energy in the process

definition of energy

capacity to cause change: without energy nothing will change

2 main forms of energy

1. kinetic energy: the energy of motion (mechanical, tehhermal, sound, radiant energy)

2. potential energy: the energy of position or structure (chemical, elastic, gravitational energy)

chemical energy (PE)

covalent bonds hold together potential energy, imagined as a rubber band

laws of thermodynamics

1. energy cannot be created or destroyed (must be transferred or transformed)

2. when energy is transferred or transformed, there is an increase in entropy (loss of energy from the system)

the breaking of bonds

releases energy

• some escapes as heat (entropy)

• some transformed into a form our bodies can use