matter
DESCRIPTION
Matter. Properties. http://z.about.com/d/chemistry/1/0/x/c/transitionmetalsolns.jpg. So What is Matter?. Anything that occupies space and has mass What isn’t matter? Energy Ideas, gravity, shadows…. Properties. - PowerPoint PPT PresentationTRANSCRIPT
Matter
Properties
http://z.about.com/d/chemistry/1/0/x/c/transitionmetalsolns.jpg
So What is Matter?
• Anything that occupies space and has mass
What isn’t matter?• Energy• Ideas, gravity, shadows…
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
Properties• Intrinsic property– does not depend on the
amount of material you havecolor, solubility, viscosity, malleability, boiling point
• Extrinsic property – depends on the amount of mattermass, volume, length
What is density?
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
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
CHM 1010 PGCC Barbara A. Gage
Changes
• Physical Change - change that does not transform the substance into another substancemelting, subliming, dissolving
Physical Changes
• What were the physical changes that you encountered in the activities on Day 2?
Splint broken into piecesNaCl dissolved in waterSand and salt mixedAlum heated and cooled
Changes• Chemical Change - change that transforms
one substance into another substanceburning,oxidation of metal precipitation of solid
Chemical Changes
• What were the chemical changes you encountered on Day 2?
Burning of ethanol Heating CuCO3
Reaction of cobalt chloride and sodium phosphateBurning splint Ethanol and KMnO4
Chemical Change
CHM 1010 PGCC Barbara A. Gage
From Silberberg, Principles of Chemistry, 2007
Distinguishing Between Physical and Chemical Changes
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