Do Now 9/22/14 Fe Cl Pb K Fluorine Beryllium Neon Mercury What elements do the following chemical symbols represent? Fe Cl Pb K What is the chemical symbol for the following elements? Fluorine Beryllium Neon Mercury 3. 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

DO NOW: Which of the samples in front of you do you believe to be metals? Circle the numbers in the table (1-7) you think are metals. Tell your partner Why/What observations help you to define these as metals? 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.

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 table Discuss with your partner whether your results match your predictions.

Identification of materials Aluminum Magnesium Cobalt Iron Carbon Copper Nickel

Another Test - Conductivity Label 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 table Discuss with your partner whether your results match your original predictions.

Metals Good 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). Copper Gold Sodium

Nonmetals Are poor conductors of heat and electricity. Many are gases at room temp (1) bromine is a liquid The solid ones are brittle. Chlorine Bromine Sulfur

Metalloids Elements 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

Results Magnets 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 conductivity Metals conduct, and the light on the meter turns on Non-metals don’t conduct and the light stays off

Metals, Non-metals and Metalloids

Separation Lab Introduction

Physical Properties A physical property is a characteristic that can be observed or measured without changing the identity of the substance. EX: melting point Boiling point Is 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)

Separation methods (separate mixtures according to physical properties) Decanting (density) Filtration (size of particle)

Vaporization (boil off liquid without collecting) (different boiling points) Chumbler - Properties of Matter

Physical Change Changes of state (freezing, boiling, condensing, etc) Breaking a large sample into smaller samples Dissolving into water

Other Techniques Add 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)

Centrifuge (density)

Chromatography (polarity) Distillation Keeps all materials- unlike vaporization (boiling point)