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Chemical Formulas and Reactions

Distinct forms of matter known in everyday experience: solid, liquid, and gas; also referred to as phases
a substance made of two or more elements that are chemically combined in fixed amounts
Chemical formulas and symbols written to represent a reaction
A pure substance composed of the same type of atom throughout
Anything that has mass and takes up space
evidence of a new substance formed from a chemical change; bubbles, fizzing
A number placed in front of a chemical symbol or formula in order to balance the equation
The mass of all reactants must equal the mass of all products. Matter is neither created nor destroyed.
A solid that is deposited from a solution
Evidence of a new substance
Characteristic that can be observed or measured without changing the substance; ex color, melting point, or conductivity
Any form of matter that is uniform throughout and has consistent properties
Number written below and to the right of an atomic symbol in a chemical formula that shows the number of a specific type of atom present
Release of energy during a chemical change; ex warmth from fire
A change in the way something reflects light, can indicate a chemical change
Increase or decrease of heat energy in a substance may be evidence of a new substance formed in a chemical reaction
A shorthand notation that used chemical symbols and numbers as subscripts to represent the type and number of atoms that are present in the smallest unit of the substance
The process by which one or more substances change to produce one or more different substances
A characteristic that can only be observed or measured when atoms of matter rearrange during a chemical change
A change that alters the identity of a substance resulting in a new substance or substances with different properties
A change to a substance that occurs without forming a new substance, such as a change in size or state of matter
A substance that takes part in and undergoes change during a reaction
The amount of product obtained in an chemical reaction
Release of energy during a chemical reaction; ex flash, fire
______ of Conservation of mass