Physical Properties And Glass Bending

Matter & It’s Properties Physical Properties & Physical Changes

Quest Histograms !

Substances • All matter consists of various substances. • Some exist alone; most are mixed together. • A substance is a unique sample of matter that has specific properties associated with it. • Extensive Properties depend on the amount of matter present (mass, volume, amount of energy) • Intensive Properties do not depend on the amount of matter present.

Compounds Water is a molecule made of one oxygen atom and two hydrogen atoms (H2O) It has different properties than either oxygen or hydrogen.

States of matter • Solid - matter that can not flow and has definite shape & volume. • Liquid - definite volume but takes the shape of its container (flows). • Gas - a substance without definite volume or shape and can flow. Expands to fill its container. • Vapor - a substance that is currently a gas but normally is a liquid or solid at room temperature.

States of Matter Definite Definite Temp. Volume? Shape? increase Solid Liquid Gas

YES

YES

NO

Compressible?

YES

Small Expans.

NO

NO

Small Expans.

NO

NO

Large Expans.

YES

Physical Properties • Are consistent and unique with respect to any single substance. • Can be measured and observed without changing the actual substance into a new one.

Physical Properties • Examples of physical properties are:

Please find your Dr. Bunsen Honeydew and brainstorm as many physical properties as you can think of.

Physical Properties Some examples of Physical Properties are: • Electrical Conductivity • Specific Heat • Heat Conductivity • Color • Density • Texture • Melting Point • Shape • Boiling Point • Mass • Index of Refraction • Malleability • Ductility

Physical Changes Throughout such changes, the substance maintains the same identity! • A single substance cannot be broken down and separated by physical means. • Mixtures however, can be separated into their component substances on the basis of the differing physical properties.

Physical Changes •Examples of physical changes: Please find your Professor Frink and brainstorm examples of physical changes.

Physical Changes Examples of Physical Changes are: • Phase Changes (States): Solid, Liquid, Gas, Plasma • Individual Separation of the Components of a Mixture (Distillation, Filtration, Chromatography) • Form or orientation of an object.

Phase Changes Sublimation Melting

Soli d

Vaporizati on

Liqui d

Gas

Freezin Condensati g on Deposition

Glass Bending!

Where the silicon dioxide flows like, well, silicon dioxide.

Glass Molecular Structure

Glass Bending Goals 1. Observe and work with the physical properties of silicon dioxide (glass) which is an amorphous solid. In other words, it doesn’t have any long range order to the atoms and flows over time. Glass is actually a super cooled liquid and does not have a rigid molecular arrangement. 2. Learn to polish the ends of a piece of glass tubing. 3. Bend 3 sections of glass into the following shapes.

90° angle, 60° angle, G (for Gunn)

Relie f

Ice Water!

Sympath y

Band Aids!

Hypochondria

Burn Spray!

Coddling

Nurses Passes!

Maybe someday you will be the next Dale Chihuly!