FOLLOWING TOPICS.

FOLLOWING TOPICS.

1. What are metals?

   • Chemical elements are organised in the periodic table. Metals and non-metals. There are just over ninety in total.

2. Types of metals.

   • Tungsen, Molybdenum, Nionium, Chromium, Platinum, Titanium, Iron, Cobalt, Nickel, Manganese, Copper, Gold, Silver, Aluminium, Magnesium, Zinc, Lead, Tin, Mercury.

3. Properties of metals.

   • Metals are very dense.
   • They are good heat and electricity conductors.
   • They reflect light.
   • All metals, except mercury, are solid at room temperature.
   • Most metals are a grey or whitish colour.
   • They can be mixed with other metals and substances to improve their properties.

4. Obtaining metals.

   • Mineral extraction.
   • Separating the ore and gangue to obtain metal ingots.
   • Transforming the ingots into useful pieces.

5. Environmental problems.

   • Mining spoils the landscape.
   • It alters the soil structure.
   • Blasting produces dust and smoke pollution.
   • Explosions and moving heavy machinery produce sound pollution.
   • Some metals and refining processes are toxic:
     • Acids and other corrosive substances are used in the separation and whasing stages.
     • Harmful gas emissions must be filtered.

6. Metal working tools.

   • Drilling tools.
     • Drills.
     • Drill bits.
     • Punches.
   • Filing tools.
     • Grinders or emery grinders.
     • Files.
     • Sandpaper.
   • Cutting tools.
     • A hacksaw toothed.
     • Snips.
     • Shears.
     • A jigsaw.
     • An angle grinder.