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Unit 2A Vocabulary

TermDefinition
chemical change Describes how a substance reacts when it interacts with other substances.
extensive property Property that depends on the AMOUNT of substance present.
intensive property Property that is the same regardless of the amount of substance present.
matter Anything that has mass and volume
physical change Change that does not involve a change in composition.
physical property Characteristic of matter that can be observed and measured without changing the chemical identity of the sample.
pure substance Matter that has a definite and constant composition
atom The smallest unit that retains the properties of an element.
electron Negatively charged subatomic particle, located outside the nucleus.
element A pure substance that cannot be broken down into a simpler substance by chemical processes.
ion An atom with a positive or negative charge. Occurs when the number of protons and electrons are different.
mass number The sum of protons plus neutrons in an atom
neutron Subatomic particle with no charge, located in the nucleus.
proton Subatomic particle with a positive charge, located in the nucleus.
atom The basic unit of a chemical element.
crystal Ordered 3-dimensional arrangement of ions
molecule A group of atoms bonded together
polymer Substance composed of long chain of repeating units.
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