Question

-3 Silver can be cleaned using baking soda and aluminium foil. How can we identify whether this is a
chemical change? Give reasons.​

Answer 1

Answer:

The reaction happens between the silver sulphide and aluminium foil when the two come in contact with baking soda

Explanation:

hope this helps

Answer 2

QUESTION:-

Silver can be cleaned using baking soda and aluminium foil. How can we identify whether this is a chemical change? Give reasons.

ANSWER:-

Yes, Silver can be cleaned using baking soda and aluminium foil because silver is soft so wears easily and is valuable it can be cleaned off the tarnish by mechanical polishing effects in the removal of the oxide and some metallic silver, so silver is lost, and silver cutlery normally has an embossed design which mechanical polishing can not get into ravines, electrochemical action doesn't care about surface contours.

• It is a chemical change because the chemical composition of the silver after being cleaned up using baking soda and aluminium foil changes and new elements are formed.

• Aluminium foil procures a "sacrificial anode" and baking soda turns the water into a conductive but non-corrosive electrolyte.

• Inlet of electrolyte, aluminium sacrificial anode and drop in tarnished silver so that it touches the foil. Silver, like all metals, gives away electrons and aluminium wants also gives away electrons so the aluminium ions discard electrons and grab bicarbonate ions out of the solution which pushes the electrons over to the silver through the point of contact. Silver unwillingly takes them, and gives silver ions in the silver oxide tarnish which turns back into metallic silver.

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