oneone cs-6b objective: to determine if substances will sink or float in order to conclude about...
TRANSCRIPT
oneCS-6B
Objective: To determine if substances will sink or float in order to conclude about their relative densities.CSI Note: Why do substances sink or float?
HAVE YOU FOLLOWED THE STEPS FOR STARTING CLASS??
Drill: 1. Get a Lesson Sheet from the
SET.2. Complete the Drill portion
only.
Density of Liquids
oneCS-6B
Let’s Review
Density of Liquids
oneCS-6B
To find the density:
Divide the mass by the volume.
Density = Mass ÷ Volume
Density of Liquids
oneCS-6B
Units for Density: g/mL or g/cm3
Density of Liquids
oneCS-6B
**The density of a substance at a given
temperature is the same for all samples of that
substance, thus making density a characteristic
property.
Density of Liquids
oneCS-6B
HOMEWORK CHECK
Density of Liquids
oneCS-6B
Calculate the density: Show 3 lines of work. (2 decimal places)
Substance 1: Mass = 85 g Volume = 10 cm3
Density = Mass ÷ Volume
Density = 85 g ÷ 10 cm3
Density = 8.5 g/cm3
Density Of Liquids
oneCS-6B
Calculate the density: Show 3 lines of work. (2 decimal places)
Substance 2: Mass = 150 g Volume = 2.5 cm3
Density = Mass ÷ Volume
Density = 150 g ÷ 2.5 cm3
Density = 60 g/cm3
Density Of Liquids
oneCS-6B
Calculate the density: Show 3 lines of work. (2 decimal places)
Substance 3: Mass = 33.92 g Volume = 3.2 cm3
Density = Mass ÷ Volume
Density = 33.92 g ÷ 3.2 cm3
Density = 10.6 g/cm3
Density Of Liquids
oneCS-6B
If you had 200g of Substance 1, what would the density of
the substance be?
8.5 g/cm3
Density Of Liquids
oneCS-6A
If you had 5.0 cm3 of Substance 2, what would the density of the substance be?
60 g/cm3
Density Of Liquids
oneCS-6B
If you had any amount of Substance 1, what would the density of the substance be?
8.5 g/cm3
Density Of Liquids
oneCS-6B
WHY????
Density is a characteristic property!!! It does not
change for a given substance!!!
Density Of Liquids
oneCS-6B
Review Activity
a. Look at your tag.b. Compute the density of
your substance.c. Based on the density,
locate all of the students that could possibly have the same substance.
Density Of Liquids
oneCS-6B
Think about these questions.
What will grains of sand do when dropped in water?
How much might a cruise ship weigh?
Do you need to make any corrections to your drill answer?
Density Of Liquids
oneCS-6B
Why do substances sink or float?
It’s not based on the weight.
It’s based on the density.
Density Of Liquids
oneCS-6B
Substances that are more dense than the substance they
are in tend to sink. Substances that are less
dense than the substance they are in tend to float.
Density Of Liquids
oneCS-6B
THE DENSITY OF WATER IS 1 g/cm3.
What does this mean?
Density Of Liquids
oneCS-6B
Use your knowledge of sinking and floating and the density of
water to complete the chart in your lab.
Density Of Liquids
oneCS-6B
You may not always know the exact densities of substances, but you can tell the relative densities of substances (whether one substance is more or less dense than another) based on sinking and floating. This concept is used when creating a density tube.
Density Of Liquids
oneCS-6B
1. Look at the information below.
Substance 1 Density = 7.03 g/cm3
Substance 2 Density = 7.2 g/cm3
Substance 3 Density = 7.15 g/cm3
Substance 4 Density = 0.75 g/cm3
2. Order the substances by their
densities from least to greatest.3. Diagram how the substances will layer.
Density Of Liquids
oneCS-6B
Density Tube
http://www.youtube.com/watch?v=-CDkJuo_LYs
Extra Credit
Density Of Liquids
oneCS-6B
Homework: In you Log Book, write
about 3 things you learned today.
Density Of Liquids