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Chemical Reactions

TermDefinition
Physical Change Its any change that alters the form or appearance of a substance but does not change it into another substance.
Chemical Change A change in matter that produces new substances, the atoms rearrange to form new substances.
Reactants Substances that undergo a chemical change. Examples are burning and rusting.
Products The new substances that form from a chemical change are called products.
Precipitate This is a solid that forms from liquids during a chemical reaction. Milk + lemon juice = curdled milk
Exothermic Reaction The energy released as the products form is greater than the energy required to break the bonds of the reactants. The energy is released as heat and light.
Endothermic Reaction More energy is required to break the bonds of the reactants than is released by the formation of the products. The energy can be absorbed by nearby matter.
Chemical Equation This is a way to show a chemical reaction using symbols instead of words.
Law Of Conservation of Mass States that during a chemical reaction matter is not created or destroyed.
Closed System Matter does not enter or leave. A chemical reaction occurs inside a sealed airtight container. Does not allow any mass to enter or escape.
Open System Matter can enter from or escape to the surroundings. EX. Fisn Bowl
Created by: sharhaynie
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