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CH 3 Vocabulary

Across
A change in which one or more substances combine or break apart to form new substances
The basic particle from which all elements are made; the smallest particle of an element that has the properties if that element
How hot or cold something is; a measure of the average energy of motion of the particles of a substance; the measure of the avg. kinetic energy of the particles of a substance
A pure substance that cannot be broken down into other substances by chemical or physical means.
A form of potential energy that is stored in the chemical bonds between atoms
Symbols that show the elements in a compound and the ratio of atoms
The principle that the total amount of matter is neither created nor destroyed during any physical or chemical change
A characteristic if a substance that describes its ability to change into different substances
The total kinetic and potential energy of all the particles of an object
A single kind of matter that is pure and has a specific set of properties
The force of attraction that holds 2 atoms together
Down
A change in which energy is absorbed
Anything that has matter and takes up space
A neutral group of two or more atoms held together by covalent bonds
A change in which energy is released
A change that alters the form or appearance of a material but does not make the material into another substance
A substance made of 2 or more elements chemically combined in a specific ratio, or proportion
2 or more substances that are together in the same place but their atoms are not chemically bonded