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35 Cards in this Set

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  • Back
matter
anything that has mass and takes up space
chemistry
study of properties of matter and how matter changes
substance
single kind of matter that is pure and has a specific set of properties
physical property
characteristic of a pure substance that can be observed without changing it into another substance
chemical property
characteristic of a pure substance that describes its ability to change into a different substance
element
pure substance that cannot be broken down into other substances by chemical or physical means
atom
the basic particle from which all elements are made
chemical bond
the force that holds two atoms together
molecule
a particle made of two or more atoms bonded together
compound
a pure substance made of two or more elements chemically combined
chemical formula
a formula that gives the elements in a compound and the ratio of atoms
mixture
two or more substances that are mixed together but not chemically combined
heterogeneous mixture
a mixture in which pure substances are unevenly distributed throughout the mixture
homogeneous mixture
a mixture in which pure substances are evenly distributed throughout the mixture
solution
an example of a homogeneous mixture; forms when substances dissolve
weight
a measure of the force of gravity on an object
mass
a measure of how much matter is in an object
International System of Units
the system of units (SI) used by scientists to measure the properties of matter
volume
the amount of space that matter occupies
density
measurement of how much mass of a substance is contained in a given volume
physical change
a change in a substance that does not change its identity
chemical change
a change in which one or more substances combine or break apart to form new substances
law of conservation of mass
principle that the total amount of matter is neither created nor destroyed during any chemical or physical change
energy
the ability to do work or cause change
temperature
a measure of the average energy of motion of the particles of a substance
thermal energy
the total energy of all the particles of an object
endothermic change
a change in which energy is taken in
exothermic change
a change in which energy is given off
kinetic energy
the energy of matter in motion
chemical energy
a form of potential energy that is stored in chemical bonds between atoms
potential energy
the energy an object has because of its position; also the internal stored energy of an object, such as stored in chemical bonds
electromagnetic energy
a form of energy that travels through spaces a waves
electrical energy
the energy of electrically charged particles moving from one place to another
electrode
a metal strip that conducts electricity
Density
mass
_______
volume