Matter & Change key terms

Chemistry
The study of the composition, structure, and properties of matter and the changes it undergoes.
Chemical
Any substance that has a definite composition.
Mass
A measure of the amount of matter
Matter
Anything that has mass and takes up space.
Atom
Smallest unit of an element that maintains the properties of that element.
Element
A pure substance made of only one kind of atom.
Compound
A substance that is made from the atomsof two or more elements that are chemically bonded.
Extensive properties
Depend on the amount of matter that is present.
Intensive properties
Do not depend on the amount of matter present.
Physical change
A change in a substance that does not involve a change in the identity of the substance
Change of state
A physical change of a substance from one state to another.
Solid
State has definite volume and definite shape.
Liquid
State has a definite volume but an indefinite shape.
Plasma
A high-temperature physical state of matter in which atoms lose their electrons.
Chemical property
Relates to a substance’s ability to undergo changes that transform it into different substances.
Chemical change/ chemical reaction
A change in which one or more substances are converted into different substances.
Reactants
The substances that are formed by the chemical change.
Products
The substances that are formed by the chemical change.
Mixture
A blend of two or more kinds of matter, each of which retains its own identity and properties.
Homogeneous
Uniform in composition
Solutions
Also called homogeneous mixtures.
Heterogeneous
Not uniform throughout.
Pure substances
Has a fixed composition and differs from a mixture.
Groups/ families
The vertical columns of the periodic table.
Periods
The horizontal rows of elements in the periodic table.
Metal
An element that is a good conductor of heat and electricity.
Nonmetal
An element that is a poor conductor of heat and electricity.
Metalloid
An element that has some characteristics of metals and some characteristics of nonmetals.
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