Matter & Energy Alex Sands

Atoms Basic building blocks of all matter Microscopic particles Makes up everything, all matter Chemical bonds hold atoms together in predictable ways to form molecules Electrons have a negative charge Protons have a positive charge Neutrals are neutral, or have no charge Protons & neutrons in the nucleus, electrons orbit around atom

Molecules Molecules are formed when atoms are organized by chemical bonding The number of electrons floating around a particular atom determines its number of chemical bond However fast the molecules are moving dertermines its state of matter – Solid – Liquid – Gas

Energy Comes in a variety of forms – Heat, light, electrical, solar, nuclear, mechanical, and chemical energy More energy causes molecules to move faster, thus changing its form Solid –> liquid –> gas Endothermic reactions are chemical reactions that take in heat

Energy Transfer Convection – Heat rising, cooling then falling Conduction – Heat transferred through direct contact of matter from particle to particle Radiation – Electromagnetic waves transporting energy through space