Science, asked by theklepty, 1 year ago

A silver article generally turns black when kept in the open for a few days. The article when rubbed with toothpaste again starts shining.
(i) Why do they turn black? Name the phenomenon involved.
(ii) Name the black substance formed and write its formula.

Answers

Answered by Jennydsilva

1. They turn black bcoz they react with sulphur present in air. The phenomenon is corrosion.
2. The black substance formed is silver sulphide.(Ag2S).

Hope it helps.

theklepty: why is the phenomenon not tarnishing

Jennydsilva: Actually bcoz it is not such any recognising phenomena thats why..

Jennydsilva: Tarnishing is not a phenomena it's an act.. phenomena is corrosion

Jennydsilva: Plz mark brainliest if it helps you..

theklepty: well ur answer satisfied me

Jennydsilva: Ok then plz mark brainliest..

theklepty: done

Jennydsilva: Thanks...

Answered by sunnydey

(i)They turn black due to aerial oxidation
(ii) The black colour substance formed is silver oxide
Ag2O

Jennydsilva: Not silver oxide.. they react with sulphur present air to form silver sulphide...

sunnydey: both oxygen and sulphur are present in atmosphere

Jennydsilva: Yeah but silver doesn't react with oxygen..

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A silver article generally turns black when kept in the open for a few days. The article when rubbed with toothpaste again starts shining.(i) Why do they turn black? Name the phenomenon involved.(ii) Name the black substance formed and write its formula.

Answers

A silver article generally turns black when kept in the open for a few days. The article when rubbed with toothpaste again starts shining.
(i) Why do they turn black? Name the phenomenon involved.
(ii) Name the black substance formed and write its formula.