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7-PS1-2

Phys/Chem Changes/Properties, Chem Compounds & Reactions

TermDefinition
Reactant A substance that enters into a chemical reaction.
Product A substance formed as a result of a chemical reaction.
Endothermic Reaction A reaction that absorbs energy.
Exothermic Reaction A reaction that releases energy, usually in the form of heat.
Law of Conservation of Matter The principle that the total amount of matter is neither created or destroyed during any chemical or physical change.
Physical change A change that alters the form or appearance of a material but does not make the material into another substance.
Physical property A characteristic of a pure substance that can be observed without changing it into another pure substance.
Chemical change A change in which one or more substances combine or break apart to form new substances.
Chemical property A characteristic of a substance that describes its ability to change into different substances.
Coefficient A number placed in front of a chemical symbol or formula that shows how many atoms or molecules of the substance are involved in the reaction
Subscript A small-sized number on the bottom right of the symbol. It refers to the number of atoms of the element
Decomposition A reaction where one reactant breaks down into two or more products
Evaporation When a liquid substance becomes a gas
Conduction The transfer of thermal energy from one particle of matter to another.
Sublimation The change in the state from a solid directly to a gas without passing through the liquid state.
Freezing When a a liquid turns into a solid when its temperature is lowered below its freezing point
Melting When a solid turns into a liquid when its temperature reaches melting point.
Created by: covingtons
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