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# Density Intro

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• 1. Tuesday, Jan 9, 2007
• Objective: SWBAT define and calculate density.
• A-Team: Make homework a priority
• Homework: (in book) pg. 48 #1-3
• Catalyst: Do ice cubes sink or float?
• 2. Catalyst
• Q: Do ice cubes sink or float?
• A: Float.
• 3. Agenda
• Binder Check
• Intro to Density (notes necessary)
• HW explanation
• 4. Physical and Chemical Properties HW
• P=Physical C=Chemical
• P: state change
• C: gives off light
• P: color
• P: state change
• C: color change
• P: magnetism
• P: density
• P: size/shape
• 5. Binder Check
• Get out your binder. Show me worksheet number 2 completed on the front side.
• (No, I am not going to listen to your excuse.)
• (Yes, this counts for a grade.)
• (Yes, we will do this again.)
• (Yes, you should see me after class for individual circumstances.)
• 6. Density Intro
• Table Challenge:
• List as many similarities and differences between these two objects
• 7. Density Intro
• 8. Why is this happening? Different densities
• Density is the amount of matter in a certain volume of a substance
• The amount of stuff crammed into the space
• Density formula
• Density = mass / volume
• D = m / V
• What does more dense mean? Let’s think about cities
• 9. Now we need to see how…
• We will calculate the density of the coke.
• Regular coke
• Mass: 391.3 g
• Volume: 355 mL
• Density
• D = mass / volume = m / V
• D = 391.3 g / 355 mL = 1.102 g / mL
• 10. Now we need to see how…
• We will calculate the density of the diet coke.
• Regular coke
• Mass: 327.8 g
• Volume: 355 mL
• Density
• D = mass / volume = m / V
• D = 327.8 g / 355 mL = 0.9233 g / mL
• 11. Oh yeah
• Density of water is always considered
• 1 g / mL
• 1 mL = 1 cm 3