Vocabulary

__**Summative Assessment #11/12 - Atoms and the Periodic Table**__
 * Vocabulary **

//Valence Electrons// – electrons that have the highest energy (located in the highest energy level) //Proton// – positive charge; located in the nucleus //Neutron// – no charge; located in the nucleus //Electron// – negative charge; moves around outside of nucleus //Ionic Compound// – a neutral atom transfers one or more electrons to another atom //Ion// – an atom or group of atoms that has an electric charge //Molecular compound// – a compound made of molecules //Atomic mass// – the average mass of all the isotopes of an element; protons + neutrons //Groups// – columns; arranged according to similar characteristics; also known as famililes //Period// – rows; metals on the left to non-metals on the right //Malleable// – can be reshaped //Ductile// – can be pulled out into long wires

__**Summative Assessment #10 - Physical and Chemical Changes**__

//Chemistry// – study of matter and how matter changes //Substance// – a single kind of matter that is pure (has specific makeup or composition) //Molecule// – a group of 2 or more atoms held together by a chemical bond //Element// – a substance that cannot be broken down into any other substances by chemical or physical means //Compound// – a substance made up of 2 or more elements that are chemically combined in a set ration //Mixture// – made up of 2 or more substances that are together in the same place but their atoms are not chemically bonded //Crystalline solid// – solids made up of crystals (three dimensional arrangements) //Amorphous Solid// – the particles are not arranged in a regular pattern //pH scale// – used to measure acids and bases; ranges from 0 to 14 //Solution// – a mixture containing a solvent and at least one solute (too small to see) and has the same properties throughout //Suspension// – a mixture in which particles can be seen and easily separated by settling or filtration //Colloid// – is a mixture containing small, undissolved particles that do not settle out //Law of Conservation of Mass// – the fact that matter is not created or destroyed in any chemical or physical change

__**Summative Assessment #9 - Density and Properties of Matter**__ • Physical Properties • Matter • Density • Mass • Volume • Weight Buoyancy