AP Biology Exam Review Questions and Answers

AP Biology Exam Review Questions and Answers Matter anything that takes up space and has mass Element A substance that cannot be broken down into simpler substances Compound A substance made up of atoms of two or more different elements joined by chemical bonds Molecule two or more atoms held together by covalent bonds Trace elements An element indispensable for life but required in extremely minute amounts. Atom Basic unit of matter Neutron A subatomic particle that has no charge and that is found in the nucleus of an atom Protons positively charged subatomic particles found in the nucleus. Electron A subatomic particle that has a negative charge and is found outside the nucleus Atomic number number of protons Mass number the sum of the number of neutrons and protons in an atomic nucleus Isotopes Atoms of the same element that have different numbers of neutrons Potential energy stored energy that results from the position or shape of an object Kinetic energy the energy an object has due to its motion