Matter and Energy Pg

 All physical and chemical changes involve a change in energy  Energy goes in or energy comes out.  If energy goes in it is endothermic  Ice melting  If energy comes out it is exothermic  Water freezing, paper burning

 Law of conservation of energy  Energy cannot be created or destroyed  It can only change form from one type to another

 Heat is a form of energy  Heat is the amount of particle movement  The faster the particles move, the more heat there is  Heat makes the particles move faster  Kinetic energy is the energy of movement  Heat is the amount of kinetic energy the particles have

 Different scales  We use Celsius and Kelvin  We use Kelvin in all calculations  K = o C + 273

 602,000,000,000,000,000,000,000 is a very important number in chemistry  6.02 x atoms in 1 mole of any substance  kg is the mass of 1 atom  x kg