Changes Classify the changes as physical or chemical Sublimation

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Presentation transcript:

Changes Classify the changes as physical or chemical Sublimation Grinding to a powder Rusting Color change

CLASSIFICATION OF MATTER

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?

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m D v Density What mass would 5.0 cm3 of lead have? 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 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 An object was dropped into a graduated cylinder that contained 40 mL. Determine the volume of that object. 5.4 Image from http://www.edinformatics.com/math_science/mass.htm

Volume = Volume of water & object – volume of water 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. Mass 386 g 23.5 cm 6.4 cm 7.8 cm

Volume = length x width x height 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!