Unit 2: Section A: Why We Use What We Do
Objectives:
 Distinguish between chemical and physical properties and between chemical and physical changes

Classify specific examples as either chemical or physical properties

Classify specific examples as either chemical or physical changes

Classify selected elements as metals, nonmetals or metalloids based on observation of chemical and physical
properties

Use the Periodic Tale to: a) predict physical and chemical properties of an element (based on location) b) identify
elements by their atomic masses and atomic number c) locate periods and groups (families) of elements

Distinguish between isotopes based on their total neutrons and/or mass numbers.

Calculate the mass number for an atom based on its total protons and neutrons.

Explain how an element’s chemical and physical properties are associated with the number and arrangement of
electrons in its atoms.
Vocabulary/Terms Introduced: Define each term

physical properties

chemical properties

physical change

chemical change

combustion

luster

ductile

metals

nonmetals

metalloids

conductor

nonconductor

malleable or brittle

atomic number

nucleus

mass number

isotopes

average atomic mass

periods

periodic relationship

group or family

alkali metal family

alkaline earth metals

halogen family

transition metals

noble gas family
Demonstrations: Copper in nitric acid (chemical and physical properties)
Laboratory Activities: A.5 Investigating Matter: Metal or NonMetal?
Reference Sheets: Periodic Table (See attached on School Wires)
In Class: Check school wires and complete the worksheet “Differences of Metals and Nonmetals.”
Worksheets: Isotopes, ions and atoms.
ChemCom —Terms –Questions Assigned
 Read A.1-A.2 pg. 94-97—Define: physical properties, chemical properties, physical change, chemical change, combustion,
luster, ductile. Questions #1-9 pg. 95-96, Section B Summary Questions #1-7 pg. 109.
 Read A.3-A.4 pg. 97-101—Define: metals, nonmetals, metalloids, conductor, nonconductor, malleable, brittle. Do Section
A Summary Questions #8-11 pg. 109.
 In Class: Check school wires and complete the worksheet “Differences of Metals and Nonmetals.”



Read A.6 (skip A.7) A.6 pg. 101-107. Do Section A Summary Questions #12-16 pg. 110 on the Periodic Table.
Read A.8 pg. 107. Answer questions # 1-6. Define: Atomic number, nucleus, mass number, isotopes, and average
atomic mass.
Finish defining terms