matter properties and composition
TRANSCRIPT
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Matter
Properties and Composition
http://z.about.com/d/chemistry/1/0/x/c/transitionmetalsolns.jpg
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So What is Matter?
• Anything that occupies space and has mass
What isn’t mass?• Energy• Ideas• Sound• And…
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Properties
• Physical Property - any property that can be observed without transforming the substance into another substance
mass, color, freezing point• Chemical Property - any property that
cannot be studied without transforming the substance into a different substance
iron rusts, paper burns
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Properties
• Intrinsic – does not depend on the amount of material you havecolor, solubility, viscosity, malleability, boiling point, density
• Extrinsic – depends on the amount of mattermass, volume, length
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Density
• Property derived from two measurements, mass and volume
• Density = Mass/Volume• Will have a unit that contains both
mass and volume such as g/cm3, lb/gal, kg/L
• Does not depend on the size of the sample
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Density
• What is the density of a sample of metal that has a mass of 34.58 g and when placed in 15.0 mL of water causes the level to rise to 22.4 mL?
34.58 gMD = = = 4.7 g/ mL
V 7.4 mL
22.4 mL - 15.0 mL = 7.4 mL
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CHM 1010 PGCC Barbara A. Gage
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Changes
• Physical Change - change that does not transform the substance into another substancemelting, subliming, dissolving
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Changes• What were the physical changes that
you encountered in activities on Day 2?
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Changes
• Chemical Change - change that transforms the substance into another substance
burning, oxidation of metal
• http://jchemed.chem.wisc.edu/JCESoft/CCA/pirelli/pages/cca1NaIHgCl2.html
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Chemical Change
CHM 1010 PGCC Barbara A. Gage
From Silberberg, Principles of Chemistry, 2007
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Distinguishing Between Physical and Chemical Change
PROBLEM: Decide whether each of the following process is primarily a physical or a chemical change, and explain briefly:
SOLUTION:
(a) Frost forms as the temperature drops on a humid winter night.(b) A cornstalk grows from a seed that is watered and fertilized.(c) Dynamite explodes to form a mixture of gases.
(d) Perspiration evaporates when you relax after jogging.
(e) A silver fork tarnishes slowly in air.
(a) physical change
(b) chemical change
(c) chemical change
(d) physical change
(e) chemical change