Do Now 9/22/141. What elements do the following chemical symbols

represent?

Fe Cl Pb K2. What is the chemical symbol for the following

elements?

Fluorine Beryllium Neon Mercury3. Look at your Metal vs Non-Metal notes from Friday. a. Which of the #s 1-7 did you think was a metal? b. Which of the #s 1-7 were magnetic?

Metals vs. Non-Metals

1. Which of the samples in front of you do you believe to be metals? a. Circle the numbers in the table

(1-7) you think are metals.b. Tell your partner Why/What

observations help you to define these as metals?

2. Are there any tests you could perform to prove to yourself that these materials are metals? What tests? Circle the tests you could perform safely in your seat.

DO NOW:

Many suggest a Magnet would confirm metal vs non metal

Label the 2nd row of the table “metallic?”

Use the magnet to test all 7 materials.

Record your results in the tableDiscuss with your partner whether your results match your predictions.

Identification of materials1. Aluminum2. Magnesium3. Cobalt4. Iron5. Carbon6. Copper7. Nickel

Another Test - ConductivityLabel the 3rd row of the table “conduct

electricity?”Test the conductivity meter by turning it

on then touching the two prongs to a metal part of your desk or chair.

If it works, use it to test for ellectrical conductivity for each of the 7 materials.

Record your results in the tableDiscuss with your partner whether your

results match your original predictions.

MetalsGood conductor of heat and electricity.Most metals are solids @ room temp.Most are malleable ( can be hammered or

rolled into thin sheets).Tend to be ductile (can be stretched into fine

wire).

Sodium Copper Gold

Nonmetals

Are poor conductors of heat and electricity. Many are gases at room temp(1) bromine is a liquidThe solid ones are brittle.

Sulfur Chlorine

Bromine

MetalloidsElements that has some characteristics of

metals and some characteristics of nonmetals.

Found along the stair-step line separates the metals from non-metals on the P. T.

They are all solids and tend to be less malleable than metals but not as brittle as nonmetals

Silicon Boron

ResultsMagnets will NOT determine whether an

unknown is a metal or a non-metal because some metals are not magnetic.

You CAN test the unknown for electric conductivityMetals conduct, and the light on the meter

turns onNon-metals don’t conduct and the light stays

off

Metals, Non-metals and MetalloidsMetals, Non-metals and Metalloids

Separation Lab Introduction

Physical PropertiesA physical property is a characteristic

that can be observed or measured without changing the identity of the substance.EX: melting pointBoiling pointIs it magnetically attracted?Does it float or sink on water?Does it dissolve in water? (Soluble?)Is it soft or hard?Is it dull or shiny?Does it conduct electricity?

Chemical properties – you must change the material to test (ie flammable)

13

Separation methods(separate mixtures according to physical properties)

Filtration (size of particle)

14

Decanting (density)

Chumbler - Properties of Matter 15

Vaporization (boil off liquid without collecting)

(different boiling points)

Physical ChangeChanges of state (freezing, boiling,

condensing, etc)

Breaking a large sample into smaller samples

Dissolving into water

16

Other TechniquesAdd water and skim floating solid off top

(take out what floats based on density)Use a magnet (remove magnetic materials and leave non magnetic materials behind)

17

18

Centrifuge (density)

19

Chromatography (polarity)

Distillation Keeps all materials- unlike vaporization

(boiling point)