Question

Q1__
compare physical and chemical properties of metals and non-metals.
Q2__
can you suggest a reason for the loss in weight of gold when given to the goldsmith for polishing.

plz give correct answers​

Answer 1

Answer:

1.Physical properties of metals

Shiny (lustrous) in natureMetal is a good conductor of electricity and heatDensity and melting point is highMouldable (Malleable)DuctileAt room temperature, it is in solid form except for mercuryOpaque

Chemical properties of metals

Easily corrodibleCan lose electronsForm basic oxidesHave lower electronegativitiesGood reducing agents

Physical properties of non-metals

Poor conductors of electricity and heatNon-Ductile metalsBrittle solidsMaybe solids, liquids or gases at room temperatureThese are not sonorousTransparent

Chemical properties of non-metals

The number of electrons in the outer shell is generally 4-8Easily gain or lose valence electronsForm acidic oxides whenever they come in contact with oxygenHigh electronegative elementsGreat oxidizing agents

2.To polish an ornament, the goldsmith dips the gold ornament in aqua regia. ... After getting dipped in the aqua regia, the outer layer of the gold dissolves in the solution and the shiny part appears. Due to the dissolving of some part of the ornament, it's weight reduces.

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