Week 10
11/2-11/5
Highlander Sheet
• Objective/SWBAT: Understand the correlation
between charge and physical properties.
• End of the Quarter!!! Check your grades. Lots of things were
entered. Test will be in today?
• Warmup: Describe each of your 3 groups that you grouped your
chemicals from the lab last week.
• Responsibilities: Homework Reflect and Connect Questions 1-4,
pp 107-108
Quiz
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An old penny is made of copper, which is more dense than zinc.
Combustion
Cannot create or destroy matter
They would be equal
Add heat, volume increases (gets bigger) molecules spread out, becomes less
dense.
Yes
Flow of electrical charges through a liquid or solid
Ions
Barrel/Chimney
Questions
Get Organized!
1. Group the stack of papers in front of you into 3 groups.
2. Be able to explain how your group chose your groupings.
Group 1
Group 2
Group 3
Physical Properties of 8 Common Materials Data Table
Medium
Medium
Medium
Lets organize this a bit
Solubility
Soluble with water Non-soluble with water. Partially soluble.
• De-icer
• Epsom Salts
• Table Salt
• Sugar
• Paraffin wax
• Aspirin
• Cornstarch
• Vitamin C
Lets organize this a bit
Conductivity
Conductive in
solution
• Aspirin
• Cornstarch
• Deicer
• Epson Salts
• Table Salt
• Vitamin C
Not Conductive in
solution
Not Applicable
• Sugar
• Paraffin wax
Lets organize this a bit
Melting Point
High
• Deicer
• Epson Salts
• Table Salt
Medium
Low
• Sugar
• Aspirin
• Cornstarch
• Vitamin C
• Paraffin wax
Groups (HW#2)
Salts
• Deicer
• Epsom Salts
• Table Salt
Acids
Organics
• Aspirin (ascorbic)
• Vitamin C
• Paraffin wax
• Cornstarch
• Sugar
(acetycilic)
WHOT Q
• What does “relative” mean in
the term relative melting
point.
Highlander Sheet
• Objective/SWBAT: Understand the correlation
between charge and physical properties.
• End of the Quarter!!! Check your grades. Test will be in today?
• Have homework out.
• Warmup: Draw a polar molecule. Why is it that electricity can
move through these polar substances?
• Responsibilities: Check SWIFT and SKYWARD
Charge and Solubility
• If water is polar… what is the substance that is soluble
with water???
• Polar!!!
• But what does that look like???
• This is a molecule.
A really good one.
Charge and Conductivity
• What does a substance need to be conductive?
• Charged particles! But what are they???
• This is an atom.
• Or…
Particle
(atom)
A really good one.
But molecules can be charged too.
A really REALLY good one.
Do common objects have both negative and
positive charges?
• Gather round for this messy and simple demo.
• Where have you seen something like this happen before?
What about polar molecules… how do they react?
• Step 1. Get a balloon, charge it up. See how water
molecules react to static electricity.
• 2. Sketch (large-two thumbs) what you think is happing
at the particle level.
• Remember water is polar! (look at your notes).
Balloon
-
• Particle diagram of water dissolving salt. Yep.
• Video
• https://www.youtube.com/watch?v=EBfGcTAJF4o
Polar and Nonpolar static interactions.
• https://www.youtube.com/watch?v=KfcVf_PdXjk
WHOT QUESTION:
• Describe the process of salt dissolving.
• (include the charges of both the salt and the water)
WHOT QUESTION:
• Create a question about polarity and charge
How do charges behave?
• Video:
• https://www.youtube.com/watch?v=-JsVZwc1dOo
• Sketch the contraption.
Conductivity cont.
• What molecule(s) from our lab (not atoms) do you think
made charged particles?
• Which molecule did not?
Charge and Melting Point
• What is melting point?
• When molecules break physical bonds
between each other. (no chemical
change)
• So if molecules of the same substance
only kind of like each other what kind
of melting point do they have?
• What about molecules with a really
really low melting point? How much
do they like each other???
But
TEACHER!
???
What does this have to do
with charge???
Items with a stronger
internal force to stick
together have a stronger
bond.
Ionic Bonds
Epsom Salt
De-Icer
Table Salt
An ionic bond is
the bonding between a non-metal
and a metal, that occurs when
charged atoms (ions) attract one
another
Polar Covalent Bonds
Covalent Bond
A covalent bond is a
chemical bond that
involves the sharing of
electron pairs between
atoms.
Dodecane- an alkane in mineral oil
Reflect and Connect Page 107-108, complete all (1-4)
…Continues on page 108
• WHOT QUESTION:
What does it mean to be a charged particle?
Include an example of a molecule and an atom.
Grading WHOTs
• Make sure name is on it. If it isn’t scowl mercilessly at your neighbor.
1pt
2pt
2pt
Quiz
• Make sure you have a book.
Grading the Quiz
1. T
2. F
3. T
4. F
5. F
6. T
7. T
Highlander Sheet
• Objective/SWBAT: Determine how charged particles
interact with water.
• Responsibilities: Vocab: Conduction
Homework!.
R&C Questions 1-4
(p.107-108)
Reminder!!! Last day for test takers to finish!