Question

What are the general properties of metals ? and why aluminium is used to wrap food materials ?

Answer 1

Answer:

Metals in general are conductive, with high electrical conductivity and high thermal conductivity. Typically they are malleable and ductile, deforming under stress without cleaving. For example, hitting a metal with a hammer will “dent” the metal, not shatter it into pieces. Am I right?

Aluminium is malleable, soft and does not react with food items so... it is used to wrap food items. Metals are good conductor of heat and electricity, so immersion rods are made up of metallic substances.

Answer 2

Answer:

- Physical Properties of Metals

Metals are lustrous, malleable, ductile, good conductors of heat and electricity. Other properties include:

State: Metals are solids at room temperature with the exception of mercury, which is liquid at room temperature (Gallium is liquid on hot days).

Luster: Metals have the quality of reflecting light from their surface and can be polished e.g., gold, silver and copper.

Malleability: Metals have the ability to withstand hammering and can be made into thin sheets known as foils. For example, a sugar cube sized chunk of gold can be pounded into a thin sheet that will cover a football field.

Ductility: Metals can be drawn into wires. For example, 100 g of silver can be drawn into a thin wire about 200 meters long.

Hardness: All metals are hard except sodium and potassium, which are soft and can be cut with a knife.

Valency: Metals typically have 1 to 3 electrons in the outermost shell of their atoms.

Conduction: Metals are good conductors because they have free electrons. Silver and copper are the two best conductors of heat and electricity. Lead is the poorest conductor of heat. Bismuth, mercury and iron are also poor conductors

Density: Metals have high density and are very heavy. Iridium and osmium have the highest densities whereas lithium has the lowest density.

Melting and Boiling Points: Metals have high melting and boiling points. Tungsten has the highest melting and boiling points whereas mercury has the lowest. Sodium and potassium also have low melting points.

Chemical Properties of Metals

Metals are electropositive elements that generally form basic or amphoteric oxides with oxygen. Other chemical properties include:

Electropositive Character: Metals tend to have low ionization energies, and typically lose electrons (i.e. are oxidized) when they undergo chemical reactions They normally do not accept electrons. For example:

Alkali metals are always 1+ (lose the electron in s subshell)

Alkaline earth metals are always 2+ (lose both electrons in s subshell)

Transition metal ions do not follow an obvious pattern, 2+ is common (lose both electrons in s subshell), and 1+ and 3+ are also observed

-----  Aluminium is malleable, soft and does not react with food items, so it is used to wrap food materials

Explanation:

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