1. GET CLICKER WOD QUIZ

2. How can matter be identified based on physical properties? What are physical properties? Physical properties are any characteristics of a material, that must be observed without changing the identity of the material.

3. Cotton Candy Table Salt

4. Compare the following in DOUBLE BUBBLE: Cotton Candy and Table Salt

5. Cotton Candy Table Salt

6. Cotton Candy Table Salt

7. Physical Properties Color Mass & volume Smell & taste Size & shape density

8. One important physical property: DENSITY

9. Density – amount of mass in a given volume Unique to every substance Does not change = physical constant Can be used to identify unknown materials

10. Color Code Your Density Equation D = Density (g/mL or g/cm3) M = Mass (grams or g) V = Volume (milli-liters or mL) (centi-meters or cm3) D = M V Density Equation Top of Paper Density Equation

11. Practice 1: write question in notes. What is the density of sample if its mass is 44.3 g and its volume is 22.1 cm^3?

12. Densities of common substances: Water 1.0 g/cm 3 Alcohol.789 g/cm 3 Gold 19.3 g/cm 3 Air.00129 g/cm 3

13. Rounding Rules 0 to 4 ADD NO MORE 5 to 9 ADD ONE TO THE LINE So for example: 0.53 0.5 So for example: 0.57 0.6

14. Round each number to the nearest tenth. 1 ) 9.54 2 ) 5.87 3 ) 5.92 4 ) 5.24 5 ) 5.64 6 ) 7.77 7 ) 1.88 8 ) 1.54 9 ) 2.42

15. THE MAGIC TRIANGLE: D M V

16. Practice Problems Always follow these steps and show all work: To solve this problem, first I … Then I … This answer is … … because D = M / V Write the equation! Fill in the variables, number and units! D = 44.3 g / 22.1 cm^3 Calculate and give the answer with unit(s)! D = 2.0 g/cm^3 Always round to the tenth position for example 1.12 would be 1.1

17. Answer the following: 1. = #7 (no decimal) 2. = #2 3. = #3 (no decimal) 4. = #4 5. = #6 OMIT #5 on paper…skip it and go to #6! Use the @ sign for your decimal.

23. Density = mass Volume A piece of tin has a mass of 16.52 g and a volume of 2.26 cm3. What is the density of tin? A man has a 50.0 mL bottle completely filled with 163 g of a slimy green liquid. What is the density of the liquid? 1930 grams of an unknown metal has a volume of 10 cm3. What is the density of the metal? What metal is it? (Look in your notes)

24. The Magic Triangle A piece of metal has a density of 11.3 g/cm 3 and a volume of 6.7 cm 3. What is the metal’s mass? The density of a piece of brass is 8.4 g/cm 3. If the mass of the brass is 510 grams, find the volume of the brass.

25. THE MAGIC TRIANGLE: D M V Girls = Even NumbersBoys – Odd Numbers

26. Quiz Tomorrow for Density, Using Steps and Triangle!

27. Density Lab Find the density of unknown objects. –D = M / V –Density = Mass / Volume –Get mass and volume of each object and solve for density. –Match density to the chart and tell me what you got. 2 cubes: (hint – l * w * h) –A = small cube –B = big cube 1 odd shaped object (hint – graduated cylinder) ColorDensity Gold19.30 g/mL Copper8.9 g/mL Brass8.0 g/mL Steel7.6 g/mL Aluminum2.7 g/mL Acrylic1.16-1.19 g/mL Nylon1.13 g/mL PVC1.39-1.42 g/mL Use this chart to answer questions: