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8th Science Vocab
8th Grade Science Vocabulary #13
Term | Definition |
---|---|
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 |