Unit 4 vocabulary

Atom

Basic unit of matter

Chemical Change

A change in matter that produces one or more new substances

Chemical formula

A combination of chemical symbols and numbers to represent a substance

Compound

A substance made up of atoms of two or more different elements joined by chemical bonds

Element

A pure substance made of only one kind of atom

Mixture

A combination of two or more substances that are not chemically combined

Physical Change

A change in a substance that does not involve a change in the identity of the substance

Precipitate

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

Substance

Matter that has a uniform and definite composition

Symbol

A thing that represents or stands for something else, especially a material object representing something abstract.

Valence Electron

Electrons on the outermost energy level of an atom

Balanced

Symmetrical

Chemical Reaction

the process by which one or more substances change to produce one or more different substances

Chemical equations

A representation of a chemical reaction using symbols of the elements to indicate the amount of substance of each reactant and product.

Coefficient

A number in front of a chemical formula in an equation that indicates how many molecules or atoms of each reactant and product are involved in a reaction.

Conservation of mass

the principle stating that matter is not created or destroyed during a chemical reaction

Product

A substance produced in a chemical reaction

Reactant

A chemical substance that is present at the start of a chemical reaction

Subscript

A number in a chemical formula that tells the number of atoms in a molecule or the ratio of elements in a compound

Yields

Makes, creates, produces; Arrow in chemical equation

Molecule

A group of atoms bonded together

Composed (Of)

dual

Conservation

Ability to recognize that objects can e transformed in some way, visually or phycially, yet still be the same in number, weight, substance, or volume

Determine

decide

Evidence

Collected body of data from observations and experiments

Formation

poiesis

Identify

provide an answer from a number of possibilities.

Indicate

denote

Production

The process in which plants continue to reproduce

Relates

strong emphasis on militar

Release

to let go

Represent

A system of government in which citizens elect representatives, or leaders, to make decisions about the laws for all the people.