FEBRUARY 7, 2014Homework: --Pick a $US. coin, (Quarter, Dime, Nickel, Penny) and identify its 1) Composition(what it is made of) 2) How this coin is minted. Bonus point: Answer: What is the

composition of braces: What Alloys/ Metals are they made of?

DoNow… (Please) Write down Homework Update T.O.C: pg. 67: Metals and Alloys Open Notebook to page 67 Open Textbook to pg. 130

READ COMPARING METALS & ALLOYS: PG: 130-131 MAKE AN OUTLINE LISTING PROPERTIES OF BOTH METALS AND ALLOYS ON PG. 67 IN NB.

Example: Comparing Metals and Alloys

A. Properties of Metals: Property 1 Property 2…. Example:

B. Properties of Alloys

METALS AND ALLOYSAlloy- A mixture made of two or more elements that has the properties of a metal –at least one of the elements is a metal

Many alloys are made by melting metals and mixing them together in carefully measured amounts

Are used much more then pure metals, because they are generally stronger and less likely to react with air and water:

What is something that can happen to metals when they react with air and water?

STEEL- USED IN MANY TOOLS FOR ITS SUPERIOR STRENGTH AND HARDNESS-

Why is Steel used for forks and spoons instead of Iron? Because stainless steel does not rust. (It can be

washed over and over again with out rusting)

Depending on their properties steels may become bicycle frames, train rails, steel tubing or construction equipment

Alloys are used to make items ranging from plumping materials, sprinkler systems to tableware, and doorknobs.

ANSWER READING CHECK POINT ON PG. 131

Why is most Jewelry made of gold alloys rather than pure gold?

ARE THEY STEEL THE SAME????

Make a Prediction: What do you think will happen to

each of the metal items in the plastic bag after leaving them in the salt water solution over the weekend?