Unit 4

The formation of a new substance with different properties; cannot be undone by physical means.

• Physical Change
• Chemical Change
• Physical Properties 
• Chemical Properties

The number written to the right and slightly below an element in a chemical formula; represents the number of atoms of an element present in a chemical formula

• Number
• Chemical Symbol
• Subscript

A representation of a compound in which the elements are represented by their symbols and subscripts represent the number of atoms of each element

• Chemical Formula
• Formula
• Chemical Symbol

A change caused by the interaction of two or more substances resulting in the formation of new substances

• Chemical Properties
• Chemical Change
• Chemical Reaction

The solid that is formed as a result of a precipitation reaction

• Precipitate
• Water
• H₂0

Change which alters the physical properties of a substance without changing its identity

• Chemical Reaction
• Physical Change
• Physical Reaction

An indication or a sign; data

• Evidence
• Report
• Stuff

A pure substance that cannot be broken down chemically into simpler substances

• Reaction
• Symbol
• Element
• Key

Representation of the name of an element; written as a capital letter or a capital letter followed by a lowercase letter(s)

• Chemical Symbol
• Subscript
• Physical Symbol

Made up of

• Made
• Reaction
• Composed
• Speed