30 terms

Chapter 1 - Matter and Change

Lessons; -Chemistry is a Physical Science -Matter and Its Properties -Elements
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chemistry
the study of the composition, structure, and properties of matter and the changes it undergoes
chemical
any substance that has a definite composition
atom
the building blocks of matter- the smalllest unit from which all elements are made;
the smallest unit of an element that maintains the properties of that element
element
a pure substance made of only one kind of atom
mass
the amount of stuff or matter in something;
a measure of the amount of matter
molecule
a substance composed of 2 or more atoms
matter
anything that has mass and takes up space
compound
a substance that is made from the atoms of two or more elements that are chemically bonded
physical property
a characteristic that can be observed or measured without changing the identity of the substance
chemical property
the ability of a substance to undergo a change that transforms it into a different substance
change of state
a physical change of a substance from one state to another
gas
the state of matter in which a substance has neither definite volume nor definite shape and the molecules have the most freedom to move.
liquid
the state of matter in which the substance has a definite volume but an indefinite shape- takes the shape of the container. Molecules have some freedom to move
solid
the state of matter in which the substance has definite volume and definite shape; molecules vibrate and have the least freedom to move
physical change
a change in a substance that does not involve a change in the identity of the substance
plasma
a high-temperature physical state of matter; a gas at very high temperatures
chemical change
a change in which one or more substances are converted into different substances
chemical reaction
a reaction in which one or more substances are converted into different substances
product
a substance that is formed by a chemical change
reactant
a substance that reacts in a chemical change
mixture
a blend of two or more kinds of matter, each of which retains its own identity and properties
heterogeneous
not having a uniform composition throughout
homogeneous
having a uniform composition throughout
pure substance
a substance that has a fixed composition and differs from a mixture in that every sample of a given pure substance has exactly the same characteristic properties and composition
vibrate
moving rapidly back and forth
nucleus
center of an atom
protons
positively charged subatomic particles found in the nucleus of the atom
neutrons
subatomic particles with no charge found in the nucleus of the atom
electrons
negatively charged subatomic particles that orbit the nucleus of the atom
volume
the amount of space a substance takes up

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