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

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Presentation transcript:

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

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

Density Commonly used to identify substances Explains why things float 3

How Does an Ice Cube Float? AB C 4

5

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

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

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

Why Did the Titanic Sink?? 9

10

11

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

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]

Density [Visual]:

Calculating density 15 V m d

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

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

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

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

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

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

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

23

K =˚C ˚C= K─273