Thursday September 20, 2012

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

Announcements• None today

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