science 8 Flashcards
activation energy
the minimum energy required to initiate a reaction
alloy
a mixture of 2 meatales
anion
a negativley charged ion
boiling
a phase change from liquid to gas(vapors)
cation
a positivley charged ion
chemical change
a change that results in a new substance with new physical and chemical properties
combustion
an exothermic chemical reaction burning
compound
a substance composed of 2 or more elemints which chemicley combine into a definite ratio
condensation
the change from a liquid to a vapor
covalent bond
a chemical bond formed when atoms share an electron
decompisition
a chemical reaction in which the reactants are broken apart
entropy
a quantitive meaure of a system
freezing
the phase change where a liquid go’s to a solid
gas
a phase of matter that has no definite value or shape
melting point
The tempeture in which a phase change occurs from a solid to a liquid
