Density Intro

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Density Intro

  1. 1. Tuesday, Jan 9, 2007 <ul><li>Objective: SWBAT define and calculate density. </li></ul><ul><li>A-Team: Make homework a priority </li></ul><ul><li>Homework: (in book) pg. 48 #1-3 </li></ul><ul><li>Catalyst: Do ice cubes sink or float? </li></ul>
  2. 2. Catalyst <ul><li>Q: Do ice cubes sink or float? </li></ul><ul><li>A: Float. </li></ul>
  3. 3. Agenda <ul><li>Review HW Answers </li></ul><ul><li>Binder Check </li></ul><ul><li>Intro to Density (notes necessary) </li></ul><ul><li>HW explanation </li></ul>
  4. 4. Physical and Chemical Properties HW <ul><li>P=Physical C=Chemical </li></ul><ul><li>P: state change </li></ul><ul><li>C: gives off light </li></ul><ul><li>P: color </li></ul><ul><li>P: state change </li></ul><ul><li>C: color change </li></ul><ul><li>P: magnetism </li></ul><ul><li>P: density </li></ul><ul><li>P: size/shape </li></ul>
  5. 5. Binder Check <ul><li>Get out your binder. Show me worksheet number 2 completed on the front side. </li></ul><ul><li>(No, I am not going to listen to your excuse.) </li></ul><ul><li>(Yes, this counts for a grade.) </li></ul><ul><li>(Yes, we will do this again.) </li></ul><ul><li>(Yes, you should see me after class for individual circumstances.) </li></ul>
  6. 6. Density Intro <ul><li>Table Challenge: </li></ul><ul><ul><li>List as many similarities and differences between these two objects </li></ul></ul>
  7. 7. Density Intro
  8. 8. Why is this happening? Different densities <ul><li>Density is the amount of matter in a certain volume of a substance </li></ul><ul><ul><li>The amount of stuff crammed into the space </li></ul></ul><ul><li>Density formula </li></ul><ul><ul><li>Density = mass / volume </li></ul></ul><ul><ul><li>D = m / V </li></ul></ul><ul><li>What does more dense mean? Let’s think about cities </li></ul>
  9. 9. Now we need to see how… <ul><li>We will calculate the density of the coke. </li></ul><ul><li>Regular coke </li></ul><ul><ul><li>Mass: 391.3 g </li></ul></ul><ul><ul><li>Volume: 355 mL </li></ul></ul><ul><li>Density </li></ul><ul><ul><li>D = mass / volume = m / V </li></ul></ul><ul><ul><li>D = 391.3 g / 355 mL = 1.102 g / mL </li></ul></ul>
  10. 10. Now we need to see how… <ul><li>We will calculate the density of the diet coke. </li></ul><ul><li>Regular coke </li></ul><ul><ul><li>Mass: 327.8 g </li></ul></ul><ul><ul><li>Volume: 355 mL </li></ul></ul><ul><li>Density </li></ul><ul><ul><li>D = mass / volume = m / V </li></ul></ul><ul><ul><li>D = 327.8 g / 355 mL = 0.9233 g / mL </li></ul></ul>
  11. 11. Oh yeah <ul><li>Density of water is always considered </li></ul><ul><ul><li>1 g / mL </li></ul></ul><ul><li>1 mL = 1 cm 3 </li></ul><ul><li>Correct answers include UNITS!!!! </li></ul>
  12. 12. Practice problems <ul><li>Find the density of a rock that has a mass of 27.2 g and a volume of 10.0 cm 3 </li></ul><ul><li>What is the density of Fanstastik spray? It has a mass of 507.8 g in a bottle with a volume 985.7 mL. </li></ul><ul><li>Will the Fanstastik float or sink when poured into water? </li></ul>

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