Catalyst – September (20- 3), 2009 Please place HW on your desk! 1. What is the slope of a line? (Think about what you learned in Algebra!) 2. If Huda puts another box onto her boat, then it will sink. Identify the independent variable, dependent variable, and control group in this situation.
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Catalyst – September (20-3), 2009 Please place HW on your desk! 1. What is the slope of a line? (Think about what you learned in Algebra!) 2. If Huda.
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Catalyst – September (20-3), 2009Please place HW on your desk!1. What is the slope of a line?
(Think about what you learned in Algebra!)
2. If Huda puts another box onto her boat, then it will sink. Identify the independent
variable, dependent variable, and control group in this situation.
Catalyst – September (20-3), 2009
1. How do you calculate slope from a mass vs. volume plot?
2. If Huda puts another box onto her boat, then it will sink. Identify the independent
variable, dependent variable, and control group in this situation.
Today’s Agenda
Catalyst Density of Water Lab Coke/Diet Coke Demo! Separating Mixtures + Student
Demos Whiteboards? Exit Question
Today’s Objectives
SWBAT calculate the density of water by making a density graph.
SWBAT plan procedures to separate mixtures based on physical properties.
Density of Water Lab
In lab, each group will measure the mass of 2 different volumes of water
Each group will record their data on the board
Each student will copy data and complete lab report in class
You have 30 minutes to FINISH the lab
How to Graph Density
1. Label axes (x = volume, y = mass)
2. Title graph (y-axis vs. x-axis)3. Determine scales4. Plot each point5. Draw trend line (line of best fit)
Calculating Density Using Slope Use the information
in the following chart to determine which substance was involved in the experiment?
Substance Density
Copper: 8.96 g/mL Aluminum: 2.70
g/mL Zinc: 7.13 g/mL
Volume (mL)
Mass (g)
1.0 3
3.0 8.5
5.0 13.8
7.0 19.2
9.0 24.5
Calculate Density Using a Graph’s Slope
Mass vs. Volume: Mystery Substance
0102030405060708090100
0 10 20 30 40 50
Volume (mL)
Mas
s (g
)
Class Work Time
Complete NUMBER TWO of your worksheet Calculate densities using your graphs!
It’s Demo Time!
Materials 1 can Coke 1 can Diet Coke Tub of water Nutritional information Example samples
Why did that happen?
___________ sugar in Coca-Cola Classic ___________ NutraSweet in Diet Coke
39 g180 mg
How can we
compare these units?
DIMENSIONAL
ANALYSIS
Back to Coke!
DensityClassic > DensityDiet
VolumeClassic = 355 mL VolumeDiet = 355 mL
MassClassic = liquid + 39 g MassDiet = liquid + 0.18 g
What about other kinds of Coke?
39 g sugar
0.18 g
NutraSweet
39 g sugar
42 g sugar
0.01 - 0.085 g
Nutra Sweet and acesulfame
potassium (ace-k)
Nutritional Info
So what if….
What if you had a GIGANTIC swimming pool full of Coke Classic cans and Diet Coke cans?
How could you separate them?
Solution!
How couldyou
separatethem?
Just addwater!
Separating Mixtures
Key Point #1: Mixtures are physically combined, so they can be PHYSICALLY separated.
Real-Life Examples of Separating Mixtures Separating components of blood
Separating oil from water in an oil spill
Getting drinkable water in third world countries
How you do that?
Key Point #2: Chemists separate mixtures by using differences in physical properties of each part.
Physical Properties: Density Solubility Magnetism Boiling Point
Density
Based off differences in density, you can separate liquids from each other
Ex: Oil and Water
Magnetism
Based on differences is magnetism, you can separate magnetic objects from non-magnetic objects
Ex: Rocks and Coins
Filtration
Based on differences in phase state, you can separate solids from liquids using filtration
Ex: Sand and waterEx: Spaghetti and water
Crystallization
Based on differences in boiling points, you can separate dissolved solids from liquids
Ex: Boil salt water to crystallize salt and evaporate water
Distillation
Based on differences in boiling points, you can separate two liquids from each other.
Liquid A has a boiling point of 100°C Liquid B has a boiling point of 110°C
How could I separate these two mixtures?
Whiteboards
Identify the technique (filtration, distillation, or crystallization) you would use to separate the following mixtures:
(1) Remove rocks from an ocean water sample. (2) A solution of salt water.(3) A mixture of oil and water.(4) Isolate sugar from a sugar-water solution.(5) Salt and ammonium chloride mixture (salt is
not soluble in ammonium chloride).(6) A mixture of paperclips and rice.(7) A mixture of water and oil.
Exit Question
Give a possible value of the density of diet coke and coke.