Tag: science & technology

Metals have free electrons that can move throughout the material, making them excellent conductors of both heat and electricity. This is why copper, aluminum, and gold are used for wires and cooking utensils. Non-metals like wood and plastic are insulators.

Ductility is the property of being drawn into wires. Metals like copper and aluminum are ductile - they can be pulled through a die to make thin wires without breaking. Malleable means beaten into sheets, polymer refers to plastics, and stretchable is not the technical term.

Rust is iron oxide (Fe2O3·nH2O), formed by oxidation of iron in the presence of oxygen and moisture. It is not a nitride (compound with nitrogen), cyanide (compound with CN-), or sulphide (compound with sulphur). The reddish-brown coating is oxidized iron.

Malleability is the property of being beaten or rolled into thin sheets. Metals like gold, silver, and aluminum are highly malleable - think of gold foil or aluminum foil. Ductile means drawn into wires, polymer means plastic, and beatable is not a technical term.

Oxygen is the odd one out because it is a non-metal, while Sodium, Lead, and Iron are all metals. Metals are typically shiny, malleable, and good conductors of electricity, whereas oxygen is a gas that is a poor conductor.

Ores are rocks or minerals from which metals can be extracted profitably. They are rich in metal content. Allotropes are different forms of the same element, metallloids are elements with properties between metals and non-metals, and slag is waste material from metal extraction.

Magnesium reacts with oxygen to form magnesium oxide (MgO) in a combination reaction. This is a classic example of a metal combining with oxygen. Iron would form iron oxide (rust), and the generic term 'metal' is too vague.

Bauxite is the primary ore of aluminium. Aluminium is extracted from bauxite through the Bayer process and Hall-Heroult process. Gold is typically found in native (pure) form, silver comes from ores like argentite, and tungsten from wolframite.

Gold is often found in the pure (native) state because it is unreactive and doesn't easily combine with other elements. Iron, aluminium, and magnesium are highly reactive and are always found combined with other elements in nature.

Be is the chemical symbol for Beryllium, which has atomic number 4. The atomic number equals the number of protons in the nucleus. This is the second element in period 2 of the periodic table.