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7-Sci-ChemReact

7-Science - Chemical Reations

TermDefinition
chemical reaction the process in which atoms are rearranged by breaking bonds and forming new bonds to produce new substances.
chemical formula the description that includes the chemical symbols of elements and numbers to describe the type and number of atoms in a substance.
chemical equation the description of a chemical reaction that shows the initial reacting substances and the final products, the resulting substance.
Reactants substances that participate in a chemical reaction, the starting substances
products substances that are formed during a chemical reaction, the resulting substances.
yield sign the arrow connecting the reactants pointing toward the products of a chemical reaction
law of conservation of mass matter cannot be created nor destroyed in ordinary physical and chemical changes
balanced equation the rule that the numbers and types of atoms on one side on a chemical equation must equal the types and numbers of atoms on the other side of the equation
coefficient the number placed in front of a chemical formula that indicates the amount of the chemical formula present
endothermic reaction a chemical reaction that requires the input of energy
exothermic reaction a chemical reaction during which energy is released
law of conservation of energy the law that states energy cannot be created or destroyed, it can only change forms
physical change a change that affects one or more physical properties of a substance
chemical change a change when one or more substances change into entirely new substances with different properties
chemical properties characteristics of an atom or substance that describe which chemical changes can or cannot happen to that substance.
precipitate a solid that results from a chemical reaction between two liquids
law of conservation of mass the law stating that mass cannot be created or destroyed but is only transformed into different substances.
gas formation bubbles and foam that form when two substances chemically react.
temperature change an increase or decrease in temperature when two substances chemically react.
color change a change of color not due to dilution that results when two substances chemically react.
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