Term
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Definition
| One or two letters used to represent an element |
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Term
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Definition
A combination of symbols and numbers that
represent the number and types of elements
(atoms) present in a compound |
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Term
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Definition
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 present. |
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Term
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Definition
When substances interact to form one or more
new substances with different properties than the
original substances |
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Term
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Definition
A combination of symbols and chemical formulas
used to describe what happens in a chemical
reaction. The equation identifies the reactants
and resulting products. |
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Term
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Definition
A number written in front of a chemical formula to
show how many molecules of that substance are
present. |
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Term
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Definition
Formulas written on the left side of the arrow
symbol ( ) are the starting substances in a
chemical reaction. |
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Term
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Definition
Formulas written on the right side of the arrow
symbol ( ) are the new substances formed in a
chemical reaction. |
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Term
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Definition
An arrow symbol that shows a reaction has taken
place. The reactants have reacted to produce a
new substance (the product). |
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Term
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Definition
A substance composed of two or more elements
chemically combined and in a definite proportion |
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Term
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Definition
A change in which the characteristics of a
substance are only changed physically and the
chemical composition stays the same. |
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Term
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Definition
A change in which a substance (or substances) is
changed into one or more new substances with
different properties than the original substances |
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Term
law of conservation of
mass |
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Definition
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. |
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Term
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Definition
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. |
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