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Chemistry 1&2


anything that has mass and takes up space matter
the study of the properties of matter and how matter changes chemistry
a single kind of matter that is pure, meaning it always has a specific makeup—or composition—and a specific set of properties substance
a characteristic of a pure substance that can be observed without changing it into another substance physical property
a characteristic of a pure substance that describes its ability to change into different substances chemical property
a pure substance that cannot be broken down into any other substances by chemical or physical means element
is the basic particle from which all elements are made atom
a force of attraction between two atoms chemical bond
groups of two or more atoms held together by chemical bonds molecule
a pure substance made of two or more elements chemically combined in a set ratio compound
shows the elements in the compound and the ratio of atoms chemical formula
made of two or more substances, elements, compounds, or both—that are together in the same place but are not chemically combined mixture
A mixture in which pure substances are unevenly distributed throughout the mixture. heterogeneous mixture
A mixture in which substances are evenly distributed throughout the mixture. homogeneous mixture
an example of a homogeneous mixture solution
a measure of the force of gravity on you weight
the measurement of the amount of matter in the object mass
The system of units (SI) used by scientists to measure the properties of matter. International System of Units
The amount of space that matter occupies volume
relates the mass of a material in a given volume density
any change that alters the form or appearance of matter but does not make any substance in the matter into a different substance physical change
A change in matter that produces one or more new substances chemical change
has a definite shape and a definite volume solid
Solids that are made up of crystals crystalline solid
the particles are not arranged in a regular pattern amorphous solid
has a definite volume but no shape of its own liquid
meaning “a substance that flows.” fluid
the result of an inward pull among the molecules of a liquid that brings the molecules on the surface closer together surface tension
a liquid’s resistance to flowing viscosity
A state of matter with no definite shape or volume. gas
The change in state from a solid to a liquid melting
The temperature at which a substance changes from a solid to a liquid; the same as the freezing point, or temperature at which a liquid changes to a solid. melting point
The change of state from liquid to solid freezing
The change from a liquid to a gas vaporization
The process that occurs when vaporization takes place only on the surface of a liquid. evaporation
occurs when a liquid changes to a gas below its surface as well as at the surface boiling
The temperature at which a liquid boils boiling point
The opposite of vaporization condensation
occurs when the surface particles of a solid gain enough energy that they form a gas sublimation
the very small center core of an atom nucleus
have a positive electric charge (indicated by a plus symbol, +) proton
have no charge neutron
move rapidly around the nucleus and have a negative electric charge electron
the number of protons in its nucleus atomic number
Atoms with the same number of protons and a different number of neutrons isotope
the sum of the protons and neutrons in the nucleus of an atom mass number
may be a diagram, a mental picture, a mathematical statement, or an object that helps explain ideas about the natural world model
the average mass of all the isotopes of that element atomic mass
A chart of the elements showing the repeating pattern of their properties. periodic table
A one- or two-letter representation of an element. chemical symbol
Created by: statclar