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Chemistry Check Point

Terms in this set (20)

matter
anything that has mass and takes up space
chemistry
the study of the properties of matter and how matter changes
substance
a single kind of matter that is pure and has a specific set of properties
physical property
a characteristic of a pure substance that can be observed without changing it into another substance
chemical property
a characteristic of a substance that describes its ability to change into different substances
element
a substance that cannot be broken down into any other substances by chemical or physical means
atom
the basic particle from which all elements are made; the smallest particle of an element that has the properties of that element
chemical bond
the force of attraction that holds two atoms together
molecule
a neutral group of two or more atoms held together by covalent bonds
compound
a substance made of two or more elements chemically combined in a specific ratio, or proportion
chemical formula
symbols that show the elements in a compound and the ratio of atoms
mixture
two or more substances that are together in the same place but their atoms are not chemically bonded
physical change
a change that alters the form or appearance of a material but does not make the material into another substance
chemical change
a change in which one or more substances combine or break apart to form new substances
law of conservation of mass
the principle that the total amount of matter is neither created nor destroyed during any chemical or physical change
temperature
how hot or cold something is; a measure of the average energy of motion of the particles of a substance
thermal energy
the total energy of the motion of all the particles of an object
endothermic change
a change in which energy is absorbed
exothermic change
a change in which energy is released
chemical energy
a form of energy that is stored in chemical bonds between atoms
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