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Chapter 21
Key Terms
18
Science
9th Grade
11/15/2011

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Term
applied research
Definition
research dedicated to the development of useful products and processes
Term
basic research
Definition
research dedicated to the discovery of the fundamental workings
Term
chemical change
Definition
during this kind of change, atoms in a substance are rearranged to give a new substance having a chemical identity
Term
chemical equation
Definition
a representation of a chemical reaction
Term
chemical formula
Definition
a notation used to indicate the composition of a compound, consisting of the atomic symbols for the different elements of the compound and numerical subscripts indicating the ratio in which the atoms combine
Term
chemical properties
Definition
a property that relates to how a substance changes its chemical identity
Term
chemical reaction
Definition
synonymous with chemical change
Term
chemistry
Definition
the study of matter and the transformations it can undergo
Term
compound
Definition
a material in which atoms of different elements are bonded to one another
Term
elemental formula
Definition
a notation that uses the atomic symbol and (sometimes) a numerical subscript to denote how atoms are bonded in an element
Term
law of mass conservation
Definition
matter is neither created nor destroyed during a chemical reaction
Term
matter
Definition
anything that occupies space
Term
molecules
Definition
a group of atoms that collectively make the fundamental unit of a material, such as water
Term
physical change
Definition
a change in which a substance changes its physical properties without changing its chemical identity
Term
physical properties
Definition
any physical attribute of a substance, such as color, density, or hardness
Term
products
Definition
a new material formed in a chemical reaction, appearing after the arrow in a chemical equation
Term
reactants
Definition
a starting material in a chemical reaction, appearing before the arrow in a chemical reaction
Term
submicroscopic
Definition
the realm of atoms and molecules, where objects are smaller than can be detected by optical microscopes
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