1. Density & Temperature Unit 1: Measurement & matter Aim: What determines the density of a substance?

2. Density  Ratio of the mass of an object to its volume 2

3. Density Commonly used to identify substances Explains why things float 3

4. How Does an Ice Cube Float? AB C 4

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6. Density of water is 1 g/mL Relative: In relation to More Dense > 1 g/mL Less Dense < 1 g/mL Density of Water

7. Which will float?  Object with higher density than water?  Or  Object with lower density than water? 7

8. Density & Volume  Increase in volume, decreases the density  What type of relationship is this?  Indirect  Inversely proportional 8

9. Why Did the Titanic Sink?? 9

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12. Density & Mass  As mass increases, density increases  What type of relationship is this?  Directly proportional 12

13. 1. the “Compactness” of an object 2. Mass of particles there are per unit of area 3. How an object uses its space Density [in words]

14. Density [Visual]:

15. Calculating density 15 V m d

16. Example #1  An unknown substance has a mass of 8.7g and a volume of 3.2cm 3. What is the density of the substance in sig figs? A: 2.7 g/cm 3

17. Example #2  What is the volume of a pure silver coin that has a mass of 14g in sig figs? The density of silver (Ag) is 10.5g/ml A: 1.3 `ml

18. Volume: the amount of space an object takes up What are two ways we measure volume? Video

19. Measuring Volume 19 Volume [=] mL [=] cm 3 With a ruler: V= L x W x H [=] cm x cm x cm With glassware (water displacement): 1mL [=] 1cm 3

20. Displacement  Usually used for awkward shaped objects 20 Final Volume Initial Volume Volume Of Object =

21. Temperature  Measure of how hot/cold an object is 21

22. Devised by Swedish Astronomer Anders Celsius. Temperature scale most commonly used for scientific work; freezing point of water =0˚C ; boiling point =100˚C Proposed by Lord William Kelvin 0 K= lowest possible temperature or absolute zero

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24. K =˚C + 273 ˚C= K─273