1. Classification Of Matter

2. Pure Substances A pure substance has a fixed & uniform composition.
It is homogeneous—the same throughout the sample.
Example: pure copper (element)—
all samples have the same properties.
Not an example: Lemonade (a mixture of
many chemical compounds)—not all
samples are the same.

3. Mixtures
A mixture is a physical blend of two or more substances which retain their own identity.
Types of mixtures
Heterogeneous-mixture of 2 or more
Homogeneous-all the same

4. Mixtures A mixture can be separated by physically:
Magnets, filter, distillation, evaporation, vaporization, chromatography

5. Heterogeneous Mixture
In a heterogeneous mixture each component keeps its original properties. Each sample of the mixture will be different. (not uniform)
Examples
tossed salad
cupcakes
soil
granite

6. Homgeneous Mixture
completely uniform throughout (the same) in composition and proportion of components.
Each sample of the mixture is exactly the same.
It is also called a solution (note: solutions can be either gas, liquid, or solid)
Examples
ketchup, gatorade
air, metal alloy (steel),
windex

7. Classification Of Matter

8. Introduction to The Periodic Table
Elements
Introduction to The Periodic Table

9. Elements the simplest form of matter cannot be broken down further
pure substances.
building blocks of all matter in the universe
on the Periodic Table

10. Symbols The symbol represents the element.
Usually the first one or two letters of the name, but some are Latin or German.
First letter is capitalized, the second letter is lower case.
Page 16 Table 2

11. Periodic Table
The key to understanding chemistry

13. The Periodic Table
The Periodic Table is the organization of known elements.
The current Periodic Table was organized by Henry Moseley.
Page 17 Figure 12

14. Rows are known as PERIODS - arranged by increasing atomic #1 2 3 4 5 6 7

15. Columns are known as GROUPS3B 4B 5B 6B 7B 8B 9B
10B
11B
12B

16. Columns are known as GROUPS8A 1A 2A 3A 4A 5A 6A 7A 8B 3B 4B 5B 6B 7B 1B 2B

17. elements in each group have similar physical & chemical properties
Groups or Families
elements in each group have similar physical & chemical properties
Representative Elements: 1a-8a (1,2 & 13-18)
represent all types of elements (S, L, & gas)
Transition elements: 1b-8b (3-12)
As you move from left to right across the middle of the table the elements transition from metals to nonmetals.
Inner Transition Metals: 2 rows at bottom
Rare earth metals & those not found in nature (man-made)

18. Periodic Table

19. Metals 80% of all elements, left side of Periodic Table
Physical Characteristics
Shiny—metallic luster
Malleable—able to be hammered, rolled, dented into thin sheets
Ductile—able to be stretched into fine wires
Tensile strength—able to resist breaking
Most are solid at room temperature (except mercury)
Good conductors of electricity and heat

20. Nonmetals 20% of elements, right side of Periodic Table
Characteristics
Brittle
Gases, except liquid bromine, solid iodine, sulfur selenium, phosphorus and carbon
Poor conductors of electricity and heat
HYDROGEN is a nonmetal

21. Metalloids properties of both metals & non metals
border both sides of the “stair stepping line” on the Periodic Table
Characteristics
Solids
Semiconductors of electricity
Used in desktop computers, digital watches, television and radios

22. Periodic Table Activity
Get 4 different colored pencils from the back and open your book to pg 17.
Use 1 color to color the inner transition metals on the bottom of the chart.
Then use the last 3 colors to color the metals, non metals and metaloids.
Make a key at the top of your chart.

23. Review Chapter 1-2
Exam Monday
Discuss study guide

24. Homework—Due Monday 9/21 Complete Periodic Table Activity
Matter and Change Review Worksheet
Exam Monday—Chapters 1-2