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Florida SSS science definitions


a substance that increases the H+ concentration when added to a water solution. Acids turn blue litmus paper red, have a pH of less than 7, and their aqueous solutions react with bases and certain metals to form salts

activation of energy

the least amount of energy required to start a particular chemical reaction


the layers of gas that surround earth, other planets or stars


the smallest unit of a chemical element that can still retain the properties of that element


the electric or magnetic force exerted by oppositely charged particles, tending to draw or hold the particles together


a substance that increases the OH- concentration of a solution; a proton acceptor

big bang theory

a cosmological theory holding that the universe originated approximately 20 billion years ago from the violent explosion of a very small agglomeration of matter of extremely high density and temperature


the manipulation(as through genetic engineering) of living orgamisms or their components to produce useful usually commercial products (as pest resistant crops, new bacterial strains or novel pharmaceuticals)


to change from a liquid to a vapor by the application of heat


a substance that speeds up or slows down the rate of reaction without being consumed or altered

chemical change

a reaction or a change in a substance produced by chemical means that results in producing a different chemical


a substance made up of at least two different elements held together by chemical bonds that only be broken down into elements by chemical processes


The relative amount of a particular substance, a solute, or mixture


The transmission of heat through a medium and without tthe motion of the medium


A material or an object that conducts heat, electricity, light, or sound

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