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science vocab test
vocabulary
Term | Definition |
---|---|
symbol(s) | one or two letters |
chemical formula | A combination of symbols and numbers that represent the number and types of elements (atoms) presented in a compound |
subscript | a small number to the right of a symbol that is written below the normal line of letters to show how how many atoms of an element are presented in a substance . no subscript means there is only one atom presented |
chemical reaction | when substances interact to form one or more new substances with different properties than the original substances |
chemical equation | a combination of chemical formulas used to describe what happens in a chemical reaction. the equation identifies the reactants and resulting products . |
coefficient | a number written in front of a chemical formula to show how many molecules of that substances are present |
reactant | Formulas written on the left side of the arrow symbol are the starting substances in a chemical reaction |
product | Formulas written on the right side of the arrow symbol are the new substances formed in a chemical reaction. |
yields | an arrow symbol that shows a reaction has taken place. the reactants have reacted to produce a new substance (the product) |
compound | a substance composed of two or more elements chemically combined and in a definite proportion |
physical change | a change in which the characteristics of a substance are only changed physically and the original properties stay the same |
chemical change | a change in which a substance (Or substances) is changed into one or more new substances with different properties than the original substances |
Law of conservation of mass | matter is not created or destroyed , only changed . the number of atoms in the product |
precipitate | a solid that forms as a result of a chemical reaction . it will fall to the bottom of the container |