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# Introduction to Density

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### Introduction to Density

1. 3. Quick Review <ul><li>The metric unit for mass is? </li></ul><ul><li>Which form of matter has particles that are free to move independently and collide frequently? </li></ul><ul><li>Which variable is usually is represented by the x-axis in a data table? </li></ul><ul><li>Give 2 unit labels for volume. </li></ul><ul><li>Physical changes to matter do not change what? </li></ul>
2. 4. Quick Review <ul><li>When CO 2(s) changes state directly into a gas without becoming a liquid, we call this______________. </li></ul><ul><li>Which form of matter has both crystalline and amorphous structures? </li></ul><ul><li>Plant leaves lose water through evaporation – physical or chemical ? Why? </li></ul><ul><li>Proteins are made from amino acids – physical or chemical ? Why? </li></ul><ul><li>Food is digested – physical or chemical ? </li></ul><ul><li>Which Law states that Mass can neither be created or destroyed? </li></ul>
3. 5. Quick Review <ul><li>What method would you use to find the volume of a block of wood? </li></ul><ul><li>What are 3 equivalent formulas for finding the volume of a cube? </li></ul><ul><li>What are the 3 equivalent units of measurement for volume of an object? </li></ul><ul><li>When will a substance float in water? </li></ul><ul><li>What is the vocabulary word for finding the volume of an irregularly shaped object? </li></ul>
4. 6. Introduction to Density A substance’s density is the measure of the mass of material within a certain volume . (amnt of space taken up) The mass (amnt of particles) is affected by how tightly packed the molecules are within the space.
5. 7. Introduction to Density A B A and B = SAME VOLUME (same size)
6. 8. Introduction to Density A B A and B = SAME VOLUME (same size) A B A and B = DIFFERENT MASS (amount of particles; different substance) Different Densities
7. 9. Introduction to Density C D C and D = DIFFERENT VOLUME (different size) but same substance
8. 10. Introduction to Density C D C and D = DIFFERENT VOLUME (different size) but same substance Same Densities- particles are packed the same way
9. 11. Let’s Review <ul><li>VOLUME – amount of space </li></ul><ul><ul><li>mL, cm 3 , cc </li></ul></ul><ul><li>DENSITY – how the particles are packed- RATIO </li></ul><ul><ul><li>g/mL , g/cm 3 , g/cc, kg/m 3 </li></ul></ul><ul><li>MASS – amount of particles </li></ul><ul><ul><li>Any gram unit </li></ul></ul>Turn to the back of your handout – blank page
10. 12. You will need this chart to ID substances. Sample Chemical Symbol Density g/cm3 Physical Attribute Lead Pb 11.3 Heaviest Mass Copper Cu 8.9 Orange Iron Fe 7.9 Magnetic/Rusts Brass Cu & Zn 8.6 Yellow Aluminum Al 2.7 Lightest Mass Zinc Zn 7.1 Dull Gray
11. 13. Substance Mass (g) Volume (cm 3 ) Density (g/cm 3 ) 4. Cube 1= _________ 5. Cube 2 = _________ 6. Cube 3 = _________ <ul><li>Cube 4 = _________ </li></ul>8. Cube 5 = _________ 9. Cube 6 = _________
12. 14. Copy chart onto Cornell Notes Sample Chemical Symbol Density g/cm3 Physical Attribute Lead Pb 11.3 Heaviest Mass Copper Cu 8.9 Orange Iron Fe 7.9 Magnetic/Rusts Brass Cu & Zn 8.6 Yellow Aluminum Al 2.7 Lightest Mass Zinc Zn 7.1 Dull Gray
13. 15. Comparing Volume, Density & Mass <ul><li>THINK about the concepts of VOLUME , DENSITY and MASS . </li></ul><ul><li>Circle same or different . </li></ul><ul><li>Explain WHY. </li></ul>
14. 16. Comparing Volume, Density & Mass <ul><li>THINK about the concepts of VOLUME , DENSITY and MASS . </li></ul><ul><li>Circle same or different . </li></ul><ul><li>Explain WHY. </li></ul><ul><li>#5. Objects A and B have the same or different densities because </li></ul>Iron Iron A B They are the same substance & the particles are packed the same way
15. 17. Density Problems <ul><li>Identify the type of numbers you have. (unit labels) </li></ul><ul><li>Understand what the problem is asking. </li></ul><ul><li>It is a one step problem or two step problem ? </li></ul><ul><li>Which formula should you use? </li></ul>
16. 18. The following formulas are for finding different variables in density problems. Density Formulas m m v D = = = D v x m D v
17. 19. <ul><li>Introduction to Density + Problems due tomorrow. </li></ul>