1.Observe the bottles at your table.
- Sketch the bottle and it’s contents
2. Shake the bottle.
- Observe the bottle
- Sketch the different phases that
you see happening (at least 3)
3. What do think is happening?
Unit 1 Matter: Intensive Properties
Agenda:
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•
•
•
•
•
Bottle Demo
Intensive Properties Notes
Demonstration
Video
Volume by displacement Practice
Calculation Practice
Homework:
Density Q’s and Prelab
Essential Question:
Why can intensive properties be used
to identify substances?
Goal:
• Demonstrate how intensive
properties can be used to identify a
compound
• Predict whether an object floats or
sinks in a liquid
ACOS:
4. Plan and conduct an investigation to
classify properties of matter as intensive
(e.g., density, viscosity, specific heat, melting
point, boiling point) or extensive (e.g., mass,
volume, heat) and demonstrate how
intensive properties can be used to identify
a compound.
1
In order to be able to determine the identity of an unknown
substance, we need to use properties that are unique and
unchanging.
These properties must be the same, regardless of how much of the
sample is used.
Therefore, we can use Intensive Properties. However not all
intensive properties are unique, ex. malleability, luster, color….
Density
• Is an example of an intensive property that is sufficiently unique to
each type of matter, that it can be used along with other
intensive properties to adequately identify unknown substances.
2
One thing that we know about density is that
substances,
solid or liquid, that are less dense will float in liquids
that are more dense.
Now order the following in terms of increasing density
(smallest to largest):
Salt water, white bead, colored bead, alcohol
________<
________ < ________ < _________
3
What can you tell us about the density of water, alcohol, & ice cubes?
Ice is (more/less) dense than liquid water? (circle one)
Ice is (more/less) dense than rubbing alcohol (circle one)
Liquid water is (more/less) dense that rubbing alcohol? (circle one)
Place in order of increasing density:
_____________ < _________ < ___________
4
Video on discovery of
densities identifying power!
• https://www.youtube.com/watch?v=ijj58xD5fDI
5
Examples:
1. A liquid has a mass of 5.0 g and occupies a
volume of 15ml, what is its density?
Density (d) = mass (m)
volume (v)
d = 5g
15ml
d= 1 g/ml
3
d= 0.33 g/ml
Examples:
2. An object with a mass of 10.0 g. It is placed in
a graduated cylinder which contains 50.0 ml of
water, and the water rises to 70.0 ml. What is
the object’s density?
d = m/v
d= 10.0 / (70.0 -50.0)
d= 10.0 / 20.0
d= .500 g/ml
6
Examples:
3. A sample with a density of 3.75 g/ml has a
volume of 10.44 ml. What is the mass of the
sample?
D = m/v
3.75g/ml = x /10.44ml
= (3.75 g / ml ) x (10.44ml)
X = 39.15 g
4. Place the following objects in order of increasing (smallest to
largest) densities.
Object A: 4.5 g per 45 ml
per 1.2 L
Object B: 10 mg per 10 ml
(1000mg = 1g)
____________
<
Object C: 2300 g
(1000ml = 1l)
_____________ <
_______________
7