BELL WORK 1/7/16
1
BELL WORK 1/7/16
1
Student Learning Objectives:
SPI 0807.9.1 – Recognize that all matter consists of atoms.
What makes up all Matter?
SPI 0807.9.6 – Compare the particle arrangement and type of
particle motion associated with different states of matter.
How do I compare the particles in a solid, liquid and gas?
SPI 0807.9.8 – Interpret the results of an investigation to
determine whether a physical or chemical change has occurred.
How can I discover if a physical or chemical change has
occurred?
Table of Contents:
# Density Demo: Coke vs Diet Coke
# Complete Density Problems #1
#Density Problems #2
Changing Change:
24 hours is up!
Lets check the status of our
three shiny pennies!
Density Demonstration:
Coke vs. Diet Coke
Compare and Contrast
Create a Venn Diagram: Coke vs. Diet Coke
Look at the two cans.
What similarities are there? (e.g. same shape)
What differences are there? (e.g. one can is red, one is silver)
What happens when both cans were place in the tank of water.
Why is one can floating?
Looks at the difference between 39 grams of sugar in Coke vs 100
mg of sweetener in Diet Coke
The more “stuff” (matter) is crammed into the same amount of
space or VOLUME , that increases the MASS. The relationship of
Mass to Volume is Density. The more matter in a defined space, the
denser it becomes. The density of water is 1g/cm3. An object will
float if the density is less than 1.
#. Layering Liquids
Demonstration
Materials:
Beaker
Shampoo
Water bottle
Water
Maple syrup
Corn oil
Dish detergent
 There are five liquids in the water bottles.
 Each liquid has a different density.
Discuss with
Your Elbow partner!
 The order of the layers shows the order of increasing
densities.
 Is the densest layer on bottom or on top?
 Does it matter in which order the liquids are added?
Density Problems
Answer the items on the
Density Problems #11-25
Density Problems # 1
Answers
10. Jill has a gel pen. The gel pen has a mass of 8g
and a volume of 2cm3. What is the density of the
rock?
8 g ∕ 2 cm3 = 4 g/cm3
11. Alicia has a watch. It has a mass of 4g and a
volume of 2cm3. What is the density of the watch?
4 g ∕ 2 cm3 = 2 g/cm3
12. Mia has a wallet. It has a mass of 15g and a
volume of 5cm3. What is the density of the wallet?
15 g ∕ 5 cm3 = 3 g/cm3
Density Problems # 1
Answers
13. Which layer has the highest density? 4
14. Which layer has the lowest density? 1
15. Imagine that the liquids have the
following densities:
Which number would go with which layer?
4 10g/cm3
2 5g/cm3
3g/cm3
3 6g/cm3
1
Density Problems # 1
Answers
16. Which liquid has the highest
density? 3 – syrup
17. Which liquid has the lowest
density? 1 – oil
18. Which liquid has the middle
density? 2 – water
Density Problems # 1
Answers
Liquid Layers – Check out picture 3:
19. Imagine that the liquids on the right
have the following densities: Which number
would go with which layer?
6 15g/cm3
4 10g/cm3
2 7g/cm3 1
3g/cm3
5 12g/cm3 3 9g/cm3
Density Problems # 1
Answers
20. What is the formula for density?
D=m/v
21. What are the units for density?
g/mL or g/cm3
22. What happens if you pour together liquids
that have different densities?
They will separate into layers with the least
dense on top and most dense on the bottom
Density Problems # 1
Answers
23. Will the liquid on the top have the
highest or lowest density?
Lowest
24. Will the liquid on the bottom have
the highest or lowest density?
Highest
Density Problems # 1
Answers
25. Jake has a book, a ruler, and a balance. How can
Jake find the density of the book with the tools he has?
(Hint: Explain HOW you use EACH tool for your answer
to be correct!)
Jake would find the volume of the book using the
ruler, than he would multiply the L x W x H in cm3.
Jake would find the mass of the book by measuring
it on the balance in g.
Lastly, Jake would find the density by D = m / v in g/cm3.
Density Problems #2
Answer the items on the
Density Problems #2
Worksheet.
Bell work
Choose one of the labs from this week. Identify the
independent variable and dependent variable. Explain
whether a chemical or physical change took place in the
lab. What are the indicators?
The following liquids were spilled into the tank:
•a green liquid that has a volume of 48 mL and a mass of 36 g
•a blue liquid that has a volume of 144 mL and a mass of 129.6 g
•a red liquid that has a volume of 96 mL and a mass of 115.2 g
•a black liquid that has a volume of 120 mL and a mass of 96 g
1. Calculate the density of each liquid. Show your work! Don’t forget the
units.
Green liquid: 36 g / 48 mL = .75 g/mL
Blue liquid: 129.6 g / 144 mL = .90 g/mL
Red liquid: 115.2 g / 96 mL = 1.2 g/mL
Black liquid: 96 g / 120 mL = .80 g/mL
2. Determine the order in which the liquids have settled in
the tank.
First (bottom): Red Liquid
Second: Blue Liquid
Third: Black Liquid
Fourth (top): Green Liquid
3. What kind of property did you use to distinguish among
these four chemicals?
A. a chemical property
C. a liquid property
B. a physical property
D. a natural property
4. Use colored pencils to color each layer and label the
position of the layers in the tank on the diagram shown
below.
Green
Black
Blue
Red
5. Now that you know where the red chemical is
inside the tank, how would you remove it?
You would use the drain at the bottom of
the barrel to drain the liquid out since it is
on the bottom with the greatest density