Matter: Changes, Classification, Density
Physical and chemical changes in matter, classification of different types of matter, determining elements, understanding volume and mass, comparing densities, and more in this informative content. Dive into the fascinating world of matter and its properties.
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Presentation Transcript
CHANGES Classify the changes as physical or chemical Sublimation Grinding to a powder Rusting Color change 1. 2. 3. 4.
How can you determine whether something is an element or not? They are all listed on the periodic table. ELEMENT SONG
MATTER All matter has volume and mass Amount of space taken up Amount of matter present
DENSITY What weighs more a pound of feathers or a pound of lead? http://tbn2.google.com/images?q=tbn:QyGG-QTvdei13M:http://www.midwestdesignimports.com/mdi_files/images/redesign/three_feathers.jpg http://tbn0.google.com/images?q=tbn:QRBccm5mLBReEM:http://www.gsi.ir/Images/MedicalGeology/Lead.jpg
DENSITY Relates the mass of a material in a given volume Allows easy comparison of different materials Which metal in the chart would weigh the most if we had 1 cm3 blocks of each metal? Which metal would weigh the least?
m DENSITY Computed using the formula D=m/v Note the units match the formula! D v What mass would 5.0 cm3 of lead have? What volume or size would 10.0 g of Al have?
DENSITY http://www.flickr.com/photos/minilaura/2279151013/ Related to sinking and floating Materials that are more dense than the surrounding material will try to sink in it. Materials that are less dense than the surrounding material will try to float on it. The density of water at room temp is about 1g/ml.
Sink or Float? Density #4 R. Bryant 2008 WSMS Based on Science Starters by T. Trimpe at http://sciencespot.net
Find the density of the object below. The object was placed on a triple beam balance. 20 20 0 0 5.4 5.4 An object was dropped into a graduated cylinder that contained 40 mL. Determine the volume of that object. Image from http://www.edinformatics.com/math_science/mass.htm
The solution Volume = Volume of water & object volume of water V = 65.0 mL 40.0 mL V = 25.0 mL M = 25.4 g Density = Mass Volume D = 25.4 g 25.0 mL D = 1.02 g/mL ** The object will sink!
Find the density of the box below. Mass386 g 23.5 cm 6.4 cm 7.8 cm
The solution Volume = length x width x height V = 23.5 cm x 7.8 cm x 6.4 cm V = 1173.12 cm3 M = 386 g Density = Mass Volume D = 386 g 1173.12 cm3 D = 0.33 g/cm3 **The box would float!
