• adhesion: : The force of attraction between the surface of unlike bodies such as a solid and a liquid.

• atom: : The smallest part of an element that can exist and still retain the characteristics of that element.

• boil: : To change from a liquid to a gaseous state. The boiling point of water is 100¼C.

• chemical change: : A change in substances that have reacted chemically. The original substance is changed to a new substance and cannot easily be recovered.

• chemical properties: : Describe how one substance will react with another. In a chemical reaction the products are very different from the reactants. The physical properties of the products may be entirely different from the physical properties of the reactants.

• chemistry: : The study of matter - its properties, composition, and changes.

• chemical properties: : Describe how one substance will react with another. In a chemical reaction the products are very different from the reactants. The physical properties of the products may be entirely different from the physical properties of the reactants.

• chemistry: : The study of matter - its properties, composition, and changes.

• cohesion: : The force of attraction between the particles (molecules) of a substance.

• compound: : A pure substance containing two or more elements united chemically. The molecules of the compound are all the same. Water is a compound consisting of hydrogen and oxygen in a ratio of 2:1.

• decanting: : To pour off the top layer without disturbing the layers or the sediment below.

• density: : The amount of mass in a substance per unit of volume.

• distillation: : The process of vaporizing and then condensing a liquid.

• element: : A pure substance in which all the atoms are the same. Hydrogen is an element for example. Click here to view a Periodic Chart of all the elements!

• filtering: : The process of passing a mixture of a liquid and a solid slowly through paper or other porous substance in order to remove the solid from the mixture.

• gas: : A state of matter in which the substance takes the shape of its container and is of low density compared to solids and liquids. Great expansion and contraction with changes in temperature and pressure occur with gases.

• heterogeneous mixture: : A mixture of varying composition (e.g. a mixture of sod and sand may have more of one component in one sample than in another sample of the same size taken from elsewhere in the mixture).

• liquid: : A state of matter in which the substance has definite volume and takes the shape of the container.

• mixture: : All of the atoms or molecules in a mixture may come from a variety of substances. A mixture is a number of pure substances brought together. In most cases the pure substances can be isolated by relatively simple procedures.

• molecule: : The smallest part of a compound that can exist and still retain the properties of that compound.

• physical change: : A change in a substance where no new substances are formed though the substance, itself, takes on different characteristics; (e.g. a solid becoming a liquid. Physical changes are reversible changes; i.e. the substance can be returned to it's original state or recovered from a mixture).

• physical properties: : Those properties that can be associated with a physical change in a substance. (e.g. state of matter, density, colour, boiling point, melting point, magnetic or conductor of electricity).

• product: : A substance obtained from one or more other substances as a result of a chemical reaction.

• pure substance: : All of the atoms or molecules of the substance are the same. Gold is an element and a pure substance; all of the atoms in the sample of gold are the same. Water is a compound and also a pure substance; all of the molecules of water in a pure sample are the same.

• reactant: : An element or compound that enters into a chemical reaction.

• saturated: : Referring to a solution that is not able to hold any more solute at that temperature.

• solid: : A state of matter in which the substance has definite shape and volume.

• solute: : The substance that is dissolved in a solution.

• solution: : A homogeneous mixture in which the solute is uniformly distributed throughout the solvent.

• solvent: : The substance that does the dissolving in a solution.

• suspension: : A mixture in which very small particles of a solid remain suspended without dissolving.

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