I disagree with the statement that all natural chemicals are not harmful and all synthetic chemicals are highly dangerous. Here are three reasons why: 1) Many natural chemicals can be harmful in large quantities, such as arsenic or snake venom. 2) Not all synthetic chemicals are inherently dangerous. Many are designed to improve quality of life, like medicines or food additives. 3) Whether a chemical is natural or synthetic does not determine if it is safe - its chemical properties and how it interacts with the body determine if it is harmful or not. Some natural chemicals can be toxic in small amounts while synthetic chemicals can be safely used.

1. 1/19 A/B Day
LEQ: How are natural substances different
from synthetic ones?
1. What is solubility?
2. What are three things that can change the
solubility of a substance?
3. In salt water, what is the solute and what is the
solvent?
4. If a scientist puts a bunch of different objects in an
oven, which will get the hottest—the object with the
lowest specific heat or the object with the highest
specific heat?
5. Explain your answer to #4!

2. PRACTICE EOG REFLECTION
1. Are you satisfied with your score on the practice
EOG?
2. Why or why not?
3. So far this year, are you doing what you need to
do in order to reach our class goal of a 3 or 4?
4. If you are, what are three things you need to
KEEP doing for our next two units? If you are
not, what are three things you need to do better
on for the rest of the year?
5. What surprised you most about the practice
EOG?

3. Let’s Review: Whiteboards

4. PUT THESE IN
ORDER FROM
OLDEST TO
YOUNGEST…
A Oldest: C
B A
C Youngest: B

5. 1. What is the oldest fossil?
2. What is the youngest fossil?
3. What do we call it when a
piece of the fossil record is
erased?

6. What are the
three things that
happen at
DIVERGENT
BOUNDARIES?

7. Mid-Ocean Ridges
Seafloor Spreading
Rift Valley
Seafloor Spreading

8. Rift Valley
Rift Valley

9. Rift Valley
RIFT VALLEY

10. Rift Valley
Mid-Ocean Ridges
Seafloor Spreading

11. Rift Valley
Seafloor Spreading
Mid-Ocean Ridge

12. NEW CRUST!
Rift Valley

13. Mid-Ocean Ridge

14. RIFT VALLEY

15. Seafloor spreading

16. MID OCEAN RIDGE

17. SUBDUCTION ZONES
VOLCANO
TRENCH

19. EOG QUESTION:
Which of the following describes the law of
conservation of matter?
a. matter cannot be created and it cannot be
destroyed
b. matter is made of everything and everything
is made of matter
c. older layers of rock are at the bottom,
younger layers of rock are at the top
d. all living things are made of elements and
compounds

20. Today’s LEQ: How are natural materials
different from synthetic ones?
By the end of today, you should be able to…
1. Describe the difference between natural and
synthetic materials
2. Identify natural and synthetic materials on the
periodic table

23. Focus Vocabulary
87. Natural Chemical
88. Synthetic Chemical

24. CONTEXT CLUES:
“This material is synthetic. It’s made in a
factory by giant machines.”
“This synthetic substance can only be
found in specific parts of Charlotte. It is
not produced naturally around the
world.”
Stop and Jot: Write your own definition of

25. Draw this in your notes:
Natural Synthetic
Chemical Chemical

26. Synthetic Chemical:
• Chemicals that are manmade
and do not exist in nature
• Examples:
steel, bronze, plastic, and all
elements with an atomic # of
95 or higher

27. Natural Chemical:
• Chemicals that exist in nature
• Examples: water, gold, oxygen

28. BOTH:
• Made of atoms
• Forms of matter
• Make up all living
and non-living
things

31. Natural Synthetic

32. SORT THESE!!
Silver

33. EOG QUESTION:
Which statement applies to all natural
elements?
a. they are all found on earth
b. they exist in nature
c. they are made by humans
d. they are all metals

34. How it’s made: Glass cookware, bars of
soap, steel drums, and firefighter
jackets

35. Summarizer:
A science teacher tells his students that all
natural chemicals are not harmful and all
synthetic chemicals are highly dangerous.
Based on what you know about natural and
synthetic chemicals, write 3-5 sentences to
the science teacher to explain whether
you agree or disagree with this statement
and WHY.