UNIT 4 MATERIALS METALS INTRODUCTORY ACTIVITY LIST TEN

UNIT 4 - MATERIALS METALS

INTRODUCTORY ACTIVITY LIST TEN METALLIC OBJECTS

METALS PHYSICAL PROPERTIES Metals have shiness, they have LUSTER. Metals are good CONDUCTORS of HEAT and ELECTRICITY. Metals are SOLID, except mercury that is liquid. Metals can be shaped into sheets, it means that they are MALLEABLE. Metals can be shaped into wires, it means that they are DULTILE. Metals are resistant to scratching, they are HARD. Metals return to their original shape, it means that thet are ELASTIC.

CHEMICAL PROPERTIES Metals form CATIONS, positive particles. ► Metals OXIDIZE easily, so it is said that they RUST. ►

Where can we find metals? We can find NATIVE metals like COPPER, SILVER, or GOLD. ► We can also find metals in ORES inside the Earth. ► The process used to obtain metals from its ores is called REFINING. ►

What is the most important metal? ► IRON is the most important metal. What is the most important iron ALLOY? STEEL is the most important iron alloy.

IRON PRODUCTION

QUESTIONS ABOUT IRON PRODUCTION 1. List the raw materials used in iron production. 2. Where is iron produced? 3. Write the range of temperature used in the blast furnace. 4. How high are some furnaces?

5. How much iron can a furnace produce per day? 6. List the products obtained from the blast furnace. 7. Name the most important elements added used to obtain steel from iron.

How are metallic material classified into? Metallic materials are classified into… What are ferrous metals made of? Ferrous metals are made of …. How can be ferrous metals identified? They can be identified …… What is the characteristic of non-ferrous metal? The characteristic of non ferrous metals is that they…. List five examples of non-ferrous metals.

List eight common pure metals. What is an alloy? An alloy is …

FERROUS METALS NAME ALLOY OF IRON AND…. PROPERTIES USES Mild steel Up to 0, 6% of Carbon (C) Tough (tenaz) It rusts easily. Common in workshops. Carbon steel Up to 1, 6% C Tough (tenaz = Cutting tools Stainless steel Nickel and chromium Resistant to rust. Tough. Home, buildings, knives Cast iron Up to 6% of C Strong but brittle Engines (acero templado) (acero al carbono) (fundición) resistente a los golpes) (quebradizo)

NON FERROUS METALS NAME COLOUR PROPERTIES ALUMIN IUM Whitish grey Light, soft, ductile, malleable, easy to work COPPER (cobre) Redish brown corrosion resistant, ductile, malleable SILVER (plata) Whitish grey Ductil, malleable, resists corrosion LEAD (plomo) Bluish grey Heavy, ductile, malleable. TIN (estaño) Bluish grey Soft, it does not rust USES

List 4 objects made of steel