Transcript: New from BookNet Canada for 2024: Loan Stars - Tech Forum 2024
1/11/12
1. 1/11/12 A/B Day
LEQ: What is the difference between a physical
and chemical change and how can we tell when
they happen?
1. What is the difference between a mixture and a
solution?
2. In a glass of chocolate milk, what is the solvent and
what is the solute?
3. What does solubility measure?
4. A scientist needs to use a material that will not get
very hot. Should the scientist use something with a
HIGH specific heat or a low specific heat?
5. EXPLAIN your answer to #4!
2. Let’s Review:
If each of these
materials is
exposed to the
same amount of
heat, which one
will be the
COOLEST?
3. HOT Q: If 5 grams of gold melts at
200° C, what temperature will cause
50 grams of gold to melt?
4. HOT Q: Which pure substance is
composed of more that one
element?
a.Carbon
b.Gold
c.Water
d.Sodium
6. Help a Scientist pick the right element:
1. A metal
2. A nonmetal
3. A metalloid
4. Something malleable
5. Something ductile
6. Something that is magnetic
7. Something that will conduct heat
8. Something that will block heat
9. Something that is a semiconductor
7. FIND THAT ELEMENT!
1. GROUP 1, PERIOD 1 =
2. GROUP 6, PERIOD 7 =
3. GROUP 2, PERIOD 5 =
4. GROUP 9, PERIOD 4 =
5. GROUP 17, PERIOD 3 =
6. GROUP 11, PERIOD 4 =
8. EOG Question:
How can a scientist, using the periodic
table, find an element with properties similar to
another element?
a) by comparing density
b) by finding its periodic group
c) by comparing malleability
d) by comparing atomic weight
10. CHEMICAL WEATHERING:
• Chemicals break down rock by
chemically changing the rock
• Usually indicated by color
change!
• Example: Acid Rain, rust
11. MECHANICAL WEATHERING:
• Physical changes to rock
(rocks break into smaller pieces)
• Example: ice, salt, wind, and
water break down rocks
12. Today’s LEQ: What is the difference
between a physical and chemical change
and how can we tell when they happen?
By the end of today, you should be able to…
1. Describe the difference between an physical
and chemical change.
2. Use observable evidence to decide if a
change is chemical or physical
19. Draw this in your notes:
Changing Substances
Physical Change:
changes the physical
traits of a
substance, NOT the
identity of the
substance
TEARING PAPER!
21. Draw this in your notes:
Changing Substances
Physical Change: Chemical Change:
changes the physical substance is changed
traits of a into a new substance
substance, NOT the (changes the identity
identity of the of something)
substance
Ex. Burning Paper!
25. Instructions:
I give you: 8 different types of evidence
that happen during physical and chemical
changes
You: use your brain to decide which of
the things is evidence of physical change
and which of the things is evidence of
chemical change
26. Physical Chemical
-Changes color
-Melting, freezing, or boiling
EVIDENCE
-Burst of heat
-Change in mass or volume
-Smoke forms
-Change in shape
-Usually reversible
-Usually irreversible
27. Physical Change: Chemical Change:
Evidence: Evidence:
1. Melting, freezing, or 1. Changes color
boiling
2. Burst of heat
2. Change in mass or
volume
3. Smoke forms
3. Change in shape
4. Usually reversible 4. Usually irreversible
46. HOT Q: How do physical and
chemical changes relate to the
different ways that the surface of
the earth changes over time??
47. Key Points:
1. A _________ changes the physical
characteristics of a substance.
2. A __________ changes something into a new
substance.
3. Changing color is evidence of a ___________.
4. Changing phases or states of matter is
evidence of a __________________.
48. Summarizer:
1. What is the difference between a chemical
change and physical change?
2. Is melting copper an example of a physical or
chemical change?
3. How can you tell the answer to #2?
4. Is a rusting nail an example of a physical or
chemical change?
5. How can you tell the answer to #4?