solid - rigid, fixed shape, fixed volume, very low kinetic energy/movement, liquid - not rigid, no fixed shape, fixed volume, increase in kinetic energy/movement , gas - not rigid, no fixed shape, no fixed volume, high kinetic energy/movement, matter - anything that has mass and occupies space, atom - basic building block of all matter, unique to each element on the periodic table, molecules - two or more atoms connected by chemical bonds, condensation - when a gas turns to a liquid, melting/fusion - when a solid turns to a liquid, vaporisation/evaporation - when a liquid turns to a gas, solidification - when a liquid turns to a solid, element - a pure substance whose atoms all have the same atomic number (number of protons)(e.g. H), electron - negatively charged particle orbiting an atoms nucleus, proton - a positively charged particle in the nucleus of an atom, neutron - a particle with no charge in the nucleus of an atom, atomic number - the number of protons in the nucleus of a specific chemical element, compound - a substance that consists of at least two chemical elements combined in a fixed ration (e.g. H2O) , mixture - a combination of two or more chemical substances in which each substance retains its chemical properties (e.g. salt water), chemical change - when a substance combines with another to form a new substance (e.g. water + iron =rust), physical change - changes state but does not make a new substance (e.g. melting ice),

Basic Chemistry Vocabulary

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