The document outlines roles and responsibilities for group work including manager, materials manager, timer/designer, and oral presenter. It also discusses assignments and quizzes on classification of matter including the periodic table. Students are expected to complete power notes and study flashcards to prepare for an upcoming science test.

1. W
Today in Science ch re
se ang
e’
You will Need: at in
s g
to
•Pencil, Colored Pencils, Highlightersdoray
Markers .
•Power Notes – Classification of Matter
–Overview – 2 page 4 sides-Bookshelf

2. • MANAGER– Organizing, Understanding,
Turning in Work for the group
• MATERIALS MANAGER– Collecting,
Keeping supplies in good condition, Returning,
Organize Table Box
• TIMER/DESIGNER– Track and
Communicate Time, In charge of design, and
quality of product
• ORAL PRESENTER– Communicator,
Asks Questions for the group, Presents finding,

3. Check Date Date Name of Assignment Possible Earned
Off Given Due Pts. Pts.
3/15 3/15
Test #2 Part 1 (on-line) 95
3/16 3/16 Test #2 Part 2 (written),
/8/20
Extra Credit, Notes
Test Corrections & 40
3/19 3/22 Signature
3/19 3/23 STAR CARDS #1-30 60
Power Notes –
3/19 3/21 Classifications of Matter &
Periodic Table - Overview
Test Retakes starting Thur.
Mar. 22 nd until Thur. Mar.
29 th

4. STAR CARDS
CA STATE
•Requires every 8th grader to take the
STAR Science Test this year
•About 75 questions in Chemistry and
Physics
•These cards will review you on
concepts we’ve covered (will cover) by
our testing date in late April
•Every Friday you will have a quiz on
these cards.

5. Topic:
Classification of Matter –
Overview
Where have you seen
things organized into
groups?
ALL MATTER can be divided
6
into ________ main
categories.

6. Matter is……………………. -anything with mass and
volume (takes up space)
And can be divided into 2
categories:
-Matter w/a constant
Pure Substance composition
-All particles have the same
properties
Mixture -Matter w/variable
composition
-Made from a blending of
two or more substances

7. Pure Substances can be -made up of atoms w/same
divided into two groups atomic #
-each element has its own
Element unique amount of protons
Examples:
-Gold
-Silver
-Oxygen

8. -2 or more elements
Compound chemically combined
-can be broken down only
by chemical means
Examples:
-Water – H2O
-Hydrogen Peroxide – H2O2
-Ammonia – NH3

9. Mixtures can be -all particles are distributed
divided into two types
evenly
-often looks like one
Homogeneous Mixture substance
Examples:
-Coffee
-Kool-Aid
-Cake Mix
-Brass

10. -particles are not
Heterogeneous distributed evenly
Mixture -usually can see the
different “ingredients”
Examples:
-Pizza
-Lucky Charms Cereal
-Inside of Backpack

11. -Pure Substances are made
Remember: up of the same basic
particle
-Can be one type of atom or
one type of molecule or
compound particle
Compound–
molecules all the
same
Element
– atoms all
the same

12. -Mixtures: each particle keeps its
Remember: own composition
-Although some particles may be
“hidden” they still keep their
structure.
Homogeneous -
Chocolate Milk–
each component
keeps its own identity
even though is it
“blended” together
Heterogeneo
us- Trail Mix
– different
parts keep
their own
identity

13. Scientists use two -Indicates the physical form in
types of Subscripts which the substance is found
Subscripts (letters) Examples:
-(s) = solid H2O(s) = ice water
-(l) = liquid H2O(s) = liquid water
-(g) = gas = H2O(s) = water vapor
-(aq) = aqueous (in solution)
Nickel in
liquid
solution

14. Subscripts (numbers) -Indicates the amount of
atoms needed to build the
compound.
Examples:
-NaCl = Sodium Chloride–
-1 sodium atom , 1 chlorine atom
-(table salt)
-N2O = Nitrous Oxide –
-2 nitrogen atoms , 1 oxygen atom
-(laughing gas)
-HC2H3O2= Acetic Acid –
-4 hydrogen, 2 carbon, 2 oxygen
-(main component of vinegar)

15. Periodic Table
The concept of elements has been around since ancient times.
We now know that each element has its own unique number of
protons. You can also tell the elements apart because of their
different properties. However, you might notice there are more
similarities between iron and silver than iron and oxygen. Could
there be a way to organize the elements so you could tell at a
glance which ones had similar properties? YES!
Dmitiri Mendeleev was the first scientist to created a periodic
table of elements similar to the one we use today. The table
showed that when the elements were ordered by increasing
*atomic mass, a pattern appeared where properties of the
elements repeated periodically.
*Today’s PT is ordered by increasing ATOMIC NUMBER
Protons + Neutrons

16. Periodic Table
The periodic table not only categorizes elements by their similar
properties but helps predict the properties of new elements to
be found. Today’s modern table is organized by increasing
atomic number, not increasing atomic mass.
Why was the table changed?
In 1914, Henry Moseley learned you could experimentally
determine the atomic number of elements. Since every element
has their own unique amount of protons, this number had
greater significance----so the periodic table was reorganized.
Before that, the atomic numbers were just the order of
elements based on increasing atomic mass.

17. Homework
1) Complete Pgs. 1 & 2 of Overview
We will be continuing with Part 2 of
these Power Notes tomorrow.
2) STAR CARDS #1-30 – Due Friday
at the beginning of class