ThursdaySeptember 20, 2012
(Categories and Properties of Matter)
A _________ property of matter is one that does not change the identity of the material if it is observed
or measured. Melting, freezing, evaporation, condensation, cutting, tearing and breaking are
examples.
By contrast, a _________ property of matter is one that changes the identity of the material if it is
manipulated. Rusting, digesting, and burning are examples.
Bell Ringer Thursday, 9-20-12physical
chemical
An _________ property is a physical property of matter that does not depend on the amount of matter in a sample.
For example, density is an intensive property of a substance because it does not depend on the amount of that substance that you have.
Whether you have a small piece of copper or a very large chunk, copper always has a density of 8.63 g/cm3.
By contrast, an _________ property is a physical property of matter that does depend on the amount of matter in a sample. It is directly
proportional to the amount of material in the sample.For example, both mass and volume are extensive properties.
Obviously, the larger the sample of iron you have, the greater its mass and its volume.
Bell Ringer Thursday, 9-20-12intensive
extensive
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Assignment Currently Open
Summative or
Formative?Date Issued Date Due Date Into
GradeSpeed Final Day
QUIZ 2 S2 9/7 9/7 9/7 9/21WS – Density = mass /
volume F9 9/10 9/13
Lab – The Rainbow Lab F10 9/11 9/12
Lab – Density of Metals F11 9/13 9/14
QUIZ 3 S3 9/14 9/14 9/14 9/28Quiz – Science
Lab Safety S4 9/17 9/17
WS – Categories,
Properties, and Phases of
Matter
F12 9/17 9/21
Quiz – Matter Vocabulary S5 9/18 9/18
Categories of Matter
Determining Categories of Matter
Can it be separated physically?No Yes
Can it be separated chemically?No Yes Is it evenly mixed?
Yes No
The Least You Need to Know
Physical properties of matter are those that, when
manipulated, observed, or measured, do not change
the chemical identity of the matter sample.
Physical Property - Melting
Physical Properties – Evaporation and Boiling
Physical Property - Freezing
Physical Property - Condensation
The Least You Need to Know
Chemical properties of matter are those that, when
manipulated, change the chemical identity of the matter sample into new
substances.
Chemical Property - RustingThe element iron "rusts" when it reacts with oxygen of the air, usually in the presence of water, to form a brown substance known as iron oxide. It is a slow chemical reaction which takes place over a period of time. Rust is the common name for iron oxide.
Chemical Property - TarnishingThe presence of the compound hydrogen s sulfide (H2S) in any material that silver comes into contact with is one of the prime reasons for silver tarnish.Materials like wool, rubber bands, fuels derived from fossils, a few types of paints and rubber (latex) gloves are some of the common materials that cause tarnishing of silver..Certain foods like eggs and onions also hasten the silver tarnish process.You can therefore realize that touching silver jewelry with oily hands or after a meal could also stain your silver jewelry with tarnish.The extent and speed with which your silver jewelry tarnishes is also related to the climate and in general, high humidity would result in silver tarnishing much faster.
Chemical Property - Oxidization