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Definitions from the first half of Module 5, pages 125-140.


Anything that has mass and takes up space.


The basic building blocks of matter.


An explanation or representation of something that cannot be seen.


A collection of atoms that all have the same number of protons.


Chemicals that result from atoms linking together.

physical change

A change that affects the appearance but not the chemical makeup of a substance. Generally reversible.


One of three forms--solid, liquid, or gas--which every substance is capable of attaining.


A uniform mixture of two or more substances that consists of solutes dissolved (a physical change) in a solvent.


The substance that changes its state to become dissolved in another substance (the solvent). Results in a solution.


The liquid that dissolves the solute. Results in a solution. Water is the most common solvent.


The random motion of molecules from an area of high concentration to an area of low concentration. Takes place through solid, liquid and gases.

semipermeable membrane

A membrane that allows some molecules to pass through but not others.


A special type of diffusion where a solvent travels across a semipermeable membrane into areas of higher solute concentration.


Molecules that react with one another and are destroyed (in that form). They are placed on the left side of the arrow in a chemical equation.


Molecules that are produced as a result of the chemical reaction. They are placed on the right side of the arrow in a chemical equation.

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