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Unit 3 (7th)

Chemical Reactions

QuestionAnswer
chemical reaction The reaction of two or more chemicals (the reactants) to form new chemicals (the products).
precipitate A solid that emerges in a chemical reaction when liquids are mixed and chemically react.
endothermic A reaction that involves bond-breaking and energy (heat) is absorbed from the surroundings; temperature decreases.
exothermic A reaction that involves bond-formation and energy (heat) is released into the surroundings; temperature increases.
synthesis reaction Two or more substances/reactants combine to form a single substance/product. (A + B → AB)
decomposition reaction One substance/single reactant breaks down into two or more substances/products. (AB → A + B)
combustion reaction A rapid and high-energy reaction between a substance and oxygen, producing heat and light (fire & explosions).
single replacement reaction One element replaces another in a compound. (A + BC → AC + B)
double replacement reaction Elements in two different compounds switch places. (AB + CD → AD + CB)
catalyst A substance that speeds up a chemical reaction.
chemical equation A representation of a chemical reaction as an equation; shows reactants on the left of an arrow and products on the right. (ex: MgO + CaS → MgS + CaO)
reactants The starting substances in a chemical reaction.
products The new substances formed in a chemical reaction.
Law of Conservation of Matter The scientific law that states that matter can neither be created nor destroyed, only transformed from one form to another.
balanced equation A chemical equation where the number of atoms of each element is the same on both sides.
chemical bond The chemical connection between atoms. (ex: ionic and covalent)
compound Substance made from more than one different element.
Created by: gibbonsUMS
 

 



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