9/29/11

transcript

9/29/11I -STARTER: Warm upTape in

Your Warm up and Comple

Justify Your

Answer Choice:

9/29/11

Tape in Your

Warm up and Comple

Justify Your

Answer Choice:

I -STARTER: Warm up

II- PRACTICE: We will begin looking at and discussing different elements.

Your notes from the discussion will go here to help you prepare for future activities and discussions about elements.

IT’S ALL ELEMENTALElements are all around us … can you recognize them when you see

What is an element? An element is a pure substance that

cannot be broken down by chemical means into other substances.

A compound contains two or more elements

. Everything is made up of elements.

What element is this?

Copper –Cu

Used in: wiring heat sinks Coins brass and bronze

alloys (metal mixtures).

But is it really Copper? Lincoln Memorial penny

dated before 1982 - made of 95% copper.

dated after 1983 - made of 97.5% zinc and plated with a thin copper coating.

Nickel –Ni classified as

an element in 1751.

The Nickel (five-cent) coin – made of 75% copper. Only 25% is nickel, It

actually has more copper than the penny!

What element is in this picture?

Helium –He

Colorless gas glows pale peach

when an electric current runs through it

Used to make balloons float

Aluminum –Al Malleable shaped into

interesting,beautifuland usefulobjects, like soda cans.

Carbon – C A diamond, but

heat it too much and it burns up into carbon dioxide gas.

Graphite used in pencils

Calcium –Ca most people think

of chalk and bones Actually…a silvery

metal that reacts with water to give off hydrogen gas

What element is shown here?

Iron –Fe Meteorite (from

ancient Mexico - made mostly of iron.

Locals created tools from

first samples made their way out to the world in the 1700s

Iodine –I gives off violet

vapor when heated used as

disinfectants for cuts and wounds before antiseptic agents were found.

Lead –Pb

Usually seen as Lead pipes

Elements Are All Around Us All of these elements are found within the

Earth, atmosphere, oceans and even in your all living things.

Silicon –Si

computer chips

Nitrogen –N 78% of the

atmosphere

Hydrogen –H

75% universe is hydrogen, a colorless gas.

The Sun is composed of Hydrogen & Helium

Chlorine –Cl purifies drinking

water and swimming pools.

Combined with sodium, makes table salt

Silver (Ag) and Gold (Au)

Phosphorous –P Used in matches

Sulfur –S

Has a very distinguishable smell

Sodium –Na exposed to water -

explode in flaming balls of molten sodium.

Mix with Chlorine -creates table salt.

It’s Oxygen –O Colorless gas Blue liquid

9/29/11

Tape in Your

Warm up and Comple

Justify Your

Answer Choice:

I -STARTER: Warm up

III- APPLICATIONExplain how the physical properties of an element determine how we use that element

9/29/11

Tape in Your

Warm up and Comple

Justify Your

Answer Choice:

I -STARTER: Warm up

IV –CONNECTIONS:Knowing what you have learned about metals, nonmetals, and elements explain:•Why do jewelers use metals instead of nonmetals to make jewelry?

9/29/11

Tape in Your

Warm up and Comple

Justify Your

Answer Choice:

I -STARTER: Warm up

IV –CONNECTIONS:Knowing what you have learned about metals, nonmetals, and elements explain:•Why do jewelers use metals instead of nonmetals to make jewelry?

V -EXIT: Writing 3-4 sentences summarizing what we have learned so far about elements

9/29/11

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