ENGLISH 7_Q4_LESSON 2_ Employing a Variety of Strategies for Effective Interp...
METALS
1. LESSON THREE: METALS Metal is a very important material in industry. Industry uses it because it has many good properties for the building of machines, structures, tools, and electric circuits. Write down in your notebook the verbs in the present simple above.
2. METALS: IRON IRON IT IS THE MOST USED METAL IN INDUSTRY PROPERTIES: 1. MALLEABLE 2. DUCTILE 3. TOUGH 4. STRONG 5. CONDUCIVE 6. HARD
3. WHAT IS AN ALLOY? Definition : An alloy is made up of two or more materials to improve a metal's properties. One of the materials has to be a metal. For example: Steel Iron Carbon = +
4. IRON ALLOYS CASTING STEEL = iron + 1.7-6.6 % of carbon = iron + less than 1.7% of carbon STAINLESS STEEL = steel + chrome + nickel
5. NON-IRON METALS: COPPER PROPERTIES: It isn't very hard. It's ductile. It's malleable. USES: Copper is used to conduct electricity. COMPARATIVE : Copper is softer than iron. VOCABULARY: ductile malleable softer
6. NON-IRON METALS: BRASS PROPERTIES: It's yellow and it has a nice appearance. It's strong. It's easy to use. USES: It's used to decorate. COMPARATIVE: Brass is cheaper than iron. VOCABULARY: appearance cheaper decorate
7. NON-IRON METALS: BRONZE PROPERTIES : It's strong. It's easy to use. USES: It's used in sculptures. COMPARATIVE: Bronze is more beautiful than iron. VOCABULARY: sculpture bronze
8. NON-IRON METALS: ALUMINUM PROPERTIES: It's strong. It's easy to use. It conduces electricity and heat. USES: It's used to make kitchen utensils (pots, pans, etc.) COMPARATIVE: Aluminum is lighter than iron. VOCABULARY: electricity pot pan light
9. OTHER METALS EXAMPLES OF METALS USED FOR ALLOYS: lead zinc nickel EXAMPLES OF METALS USED FOR JEWELLERY: gold silver platinum
10. OBTAINING METAL You can obtain metal in mines . In mines, you dig up dirt to get mineral rocks. In the mineral rocks, you can find minerals mixed with other elements. REMEMBER : dig up dirt mines
11. PROCESS OF OBTAINING METALS 1. Extract mineral rocks from mines. 2. Grind rocks so you can extract the minerals. 3. Fuse minerals. 4. Mix metal with another element to make alloys. 5. Pour hot liquid metal in molds to create different pieces. VOCABULARY: grind fuse mix pour (liquids)
