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8th Science Vocab

8th Grade Science Vocabulary #13

One or two letters used to represent an element Symbol
A combination of symbols and numbers that represent the number and types of elements present in a compound Chemical Formula
A small number to the right of a symbol that is written below the normal line of letters to show how many atoms of an element are present in a substance. No subscript means there is only one atom Subscript
When substances interact to form one or more new substances with different properties that the original substances Chemical Reaction
A combination of symbols and chemical formulas used to describe what happens in a chemical reaction. The equation identified the reactants and resulting products. Chemical Equation
A number written in front of a chemical formula to show how many molecules of that substance are present. Coefficient
Formulas written on the left side of the arrow symbol are the starting substances for a chemical reaction. Reactant
Formulas on the right side of the arrow symbol are new substances formed in a chemical reaction. Product
An arrow symbol that shows a reaction has taken place. The reactants have reacted to produce a new substance. Yields
A substance composed of two or more elements chemically combined and in a definite proportion. Compound
A change in which the characteristics of a substance are only changed physically and the chemical composition stays the same. Physical Change
A change in which a substance is changed into one or more new substances with different properties than the original substances. Chemical Change
Matter is not created or destroyed, only changed. The number of atoms in the reactants must be equal to the number of atoms in the product. Law of conservation of mass
A solid that forms as a result of a chemical reaction. It may appear cloudy and will fall to the bottom of the container over time. Precipitate
Created by: ehudson1