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bases bitter, slippery and litmus paper turns blue -ide second element in ionic compound ends in metaaloids or semi-conductors elements that share properties of metals and non-metals metallic as elements move from left to right across periodic table they become less force of zero means objects remain at rest or are balanced law of conservation of mass cannot be created nor destroyed Ex of homogeneous and heterogeneous mixtures homo- evenly spread throughout milkshake, hetero - evely spread mixture (mixed nuts, choc chip cookies) families on periodic tables noble gses, halogens, rare earth efficiency ratio of useful work output to work input co-efficients chemical equation can only be balanced by changing or adding this units of power horse power, watts, joules temperature when a gas increases in ___, it increases in pressure Dimitri Mendeleev published the first periodic table chemical properties valence electrons determine an atoms ___ solids waves travel the quickest through mechanical energy an electric motor converts electric energy into solid which state of matter is not a fluid gas - liquid, solid-solid, liquid-solid which states of matter form solutions exothermic temperature increases in ___ reaction electron elements in the periodic texable are related by ___ arrangement scientific theory explanation that has been tested by many observations air resistance opening of a sky divers parachute explains this free fall all objects accelerating near earth's surface are in__- chemical bonds hold atoms and ions together electromagnetic waves light travels as air medium for sound waves water medium for water waves earth medium for seismic waves mass of an object, height and acceleration due to gravity gravitational potential energy depends upon these