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7.6 A

Physical & Chemical Changes

TermDefinition
Chemical Change A change that alters the chemical composition of a material. Ex: Digestion (carbohydrates breaking down into sugar)
Physical Change A change in the appearance of a material with no change to its chemical composition. Ex: Phase Change (water boiling)
Phase Change a change from one state (solid or liquid or gas) to another without a change in chemical composition.
Atoms The smallest unit of matter Ex: Carbon Atom
Melting A phase change from the solid state to the liquid state. Ex: Mercury melts at -38 degrees Fahrenheit
Boiling Point Temperature at which evaporation & condensation occur. A physical property of a substance. Ex: 100 degrees Celsius for water
Freezing A phase change from the liquid state to the solid state. A physical change.
Physical Properties properties that can be observed without a changing the substance. Ex: Density Boiling Point
Density The amount of mass present in a given volume. A reflection of how tightly packed the atoms are.
Periodic Table A chart of the elements, organized by physical & chemical properties of the different types of atoms.
Gas Production The formation of a gas is often an indication of a chemical change. Ex: Mixing vinegar & baking soda yields carbon dioxide.
Solid Formation A solid product can provide evidence of a chemical change. Ex: Rust that forms on metal
Color Change A sign that a chemical or physical change has occurred.
Temperature Change A sign that a chemical or physical change has occurred.
Condensation A physical change. A gas turns into a liquid.
Evaporation A physical change. A change from the liquid state to the gas state, but is still water; it has not changed into any other substance.
Created by: bliberoni
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