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Density Intro Density Intro Presentation Transcript

  • 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?
  • Catalyst
    • Q: Do ice cubes sink or float?
    • A: Float.
  • Agenda
    • Review HW Answers
    • Binder Check
    • Intro to Density (notes necessary)
    • HW explanation
  • 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
  • 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.)
  • Density Intro
    • Table Challenge:
      • List as many similarities and differences between these two objects
  • Density Intro
  • 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
  • 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
  • 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
  • Oh yeah
    • Density of water is always considered
      • 1 g / mL
    • 1 mL = 1 cm 3
    • Correct answers include UNITS!!!!
  • Practice problems
    • Find the density of a rock that has a mass of 27.2 g and a volume of 10.0 cm 3
    • What is the density of Fanstastik spray? It has a mass of 507.8 g in a bottle with a volume 985.7 mL.
    • Will the Fanstastik float or sink when poured into water?