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1. WHAT ARE VALENCE ELECTRONS? WHAT INFORMATION CAN THEY GIVE US?
2. OPEN YOUR TEXTBOOK TO PAGE 358 READ ABOUT ELEMENTAL EFFECTS AND ANSWER THE QUESTIONS.
Do Now: 5 -10 min
Valence electrons: electrons in the outermost energy level from the nucleus.
They tell us how many electrons areavailable for bonding.
Strotntium (Red) and Sodium (Yellow)
HOMEWORK AND ANNOUNCEMENTS Due: page 359-363 All Questions Due: Lewis Dot Structure worksheet
Lab reports and power point presentations due in one week
Homework: Read Pages 397-401 complete all questions and activities
USA TestPrep
MORE PRACTICE1. Draw an Aluminum atom using Bohr’s model.
(Atomic # = # p+), (# p+ = # e-), (n = mass# - p+)
2. How many valence electrons does it have?3. Draw a Lewis Dot Diagram for Aluminum.
4. How many unpaired electrons are there?5. How many bonds can Aluminum form?
13Al
Aluminum27
13 p+13 e-14 nPeriod 3
13 p+
14 n
3
Al3
3
SUBSTANCES AND MIXTURESL.O. SWBAT distinguish between mixtures and pure substances.
SC.8.P.8.9 Distinguish among mixtures (including solutions) and pure substances.
VOCABULARY
Word Definition Example Drawing
Pure Substance
Elements
Compounds
Mixture
A single kind of matter that has a specific makeup or composition. Water, Sugar,
SaltElements are made up of only one type of atom. Phosphorus
Two or more different elements chemically combined
Two or more substances that are together in the same place, but their atoms are not chemically bonded.
Candy mix
PAGE 391 What do you think Mixture / Pure Substance?
ELEMENTS MIXTURES AND COMPOUNDS
VOCABULARYWord Definition Example Drawing
HomogeneousMixture
Heterogeneous
Mixture
Evenly mixed so you can’t differentiate the parts by simply looking at the mixture.
Lemonade
A mixture in which you can see the different parts and can easily separate them out.
Trail Mix and beach sand
BRAIN POP QUIZ COMPOUNDS AND MIXTURES
HETEROGENEOUS VS HOMOGENEOUS
1. First label each mixture on page 3932. Cut out the pictures on page 393 and place the
substance in the correct category.
SUMMARYWhat is the difference between an element and a compound?
What is the difference between an pure substance and a mixture?
What is the difference between heterogeneous and homogeneous mixture?
HOMEWORKRead pages 397-401 answer all questions complete all activities