the scientific study of the composition, structure, and properties of matter and changes that matter changes
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Chemical
any substance that has a defined composition
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Mass
a measure of the amount of matter in an object
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Matter
any that has mass and takes up space
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Atom
the smallest unit of an element that maintains the chemical properties of that element
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Element
a substance that can not be separated or broken down into simpler substances by chemical means; all atoms of an element have the same atomic number
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Compound
a substance made up of atoms of two or more different elements joined by chemical bonds
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Extensive Property
a property that depends on the extent or size of a system
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Intensive Property
a property that does not depend on the amount of matter present, such as pressure, temperature, or density
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Physical Property
a characteristic of a substance that does not involve a chemical change, such as intensity, color, or hardness
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Physical Change
a change of matter from one form to another without a change in chemical properties
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Change of State
the changes of a substance from one physical state to another
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Solid
the state of matter in which the volume and shape of a substance are fixed
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Liquid
the state of matter that has a definite volume b not a definite shape
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Gas
a form of matter that does not have a definite volume or shape
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Plasma
in physical science, a state o matter that starts as a gas and then becomes ionized; it consists of free-moving ions and electrons, it takes on an electric charge, and its properties differ from those of a solid, liquid, or gas
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Chemical Property
a property of matter that describes a substance’s ability to participate in chemical reactions
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Chemical Change
a change that occurs when one ore more substances change into entirely new substances with different properties.
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Chemical Reaction
the process by which one or more substances change and to produce one or more different substances
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Reactant
a substance or molecule that participates in a chemical reaction
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Group
a vertical column of elements in he periodic table; elements in a group share chemical properties
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Family
a vertical column of the periodic table
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Period
in chemistry, a horizontal ow of elements in the periodic table
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Metal
an element that is shiny and that conducts heat and electricity well
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Nonmetal
an element that conducts heat and electricity poorly and that does not form positive ions in an electrolytic solution
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Metalloid
an element that has properties of both metals and nonmetals; sometimes referred to as a semiconductor
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