P.S. ch 2 matter vocab

chemical change

• A change that occurs when one or more substances change into entirely new substances with different properties.

• A change that only affects the physical appearance of a substance.

• A change that involves the mixing of two or more substances without altering their chemical structure.

• A change that occurs when a substance is heated or cooled without any chemical reaction.

melting point

• The temperature at which a solid becomes a liquid

• The temperature at which a liquid becomes a gas

• The temperature at which a solid becomes a gas

• The temperature at which a gas becomes a liquid

chemical property

• Ability of a substance to undergo a specific chemical change

• Physical characteristic of a substance that can be observed without changing its identity

• The measure of a substance's resistance to flow

• The temperature at which a substance changes from solid to liquid

solution

• A heterogeneous mixture of two or more substances

• A homogeneous mixture of two or more substances

• A pure substance with a fixed composition

• A mixture that cannot be separated by physical means

mixtures

• 2 or more components physically combined; atoms and molecules don't change as there is no chemical bonding. Can separate out the components.

• A combination of substances that results in a new chemical compound.

• A homogeneous mixture where the components are evenly distributed and cannot be separated.

• A solution where one substance is dissolved in another, resulting in a single phase.

compounds

• Made up of atoms of two or more elements in fixed proportions

• Consist of only one type of atom

• Are always gases at room temperature

• Can be separated by physical means

colloid

• A mixture that contains small particles that are completely dissolved in a solution.

• A mixture that contains some particles that are intermediate in size between the small particles in a solution and the larger particles in a suspension.

• A homogeneous mixture of two or more substances that are evenly distributed.

• A mixture that contains large particles that settle out over time.

pure substance

• Matter that always has exactly the same composition; an element or a compound

• A mixture of two or more substances

• A substance that can be broken down into simpler substances

• A material that can exist in different states of matter

elements

• A molecule composed of one kind of atom; cannot be broken into simpler units by chemical reactions.

• A mixture of different types of atoms that can be separated by physical means.

• A compound formed by the chemical combination of two or more different elements.

• A substance that can be broken down into simpler substances by chemical reactions.

precipitate

• A gas that escapes from a liquid during boiling.

• A solid that forms from a solution during a chemical reaction.

• A liquid that evaporates when heated.

• A color change that indicates a chemical reaction.