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9th grade physical science study guide

Terms in this set (86)

chemical change
a change in which one or more substances combine or break apart to form new substances
chemical equations
a representation of a chemical reaction that uses symbols to show the relationship between the reactants and the products
law of conservation of matter
states that matter is neither created nor destroyed, only changed in form
reactant
a substance or molecule that participates in a chemical reaction
product
a chemical substance formed as a result of a chemical reaction
coefficient
number in front of a variable
subscript
a number in a chemical formula that tells the number of atoms in a molecule or the ratio of elements in a compound
single displacement
one element trades places with another element in a compound: A + BC --> AC + B
double displacement
reaction in which two particles are exchanged by replacing like particles in another formula unit
combustion
the act of burning something
synthesis
the process of producing a chemical compound (usually by the union of simpler chemical compounds
decomposition
a chemical reaction that breaks down compounds into simpler products
exothermic reaction
a chemical reaction accompanied by the evolution of heat
endothermic reaction
..., A reaction that absorbs energy in the form of heat
heterogeneous mixture
a mixture in which different materials can be distinguished easily
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