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.