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