Bringing Back Shine to Copper


This unit uses the context of cleaning of copper surfaces using common cleaning agents to learn about the chemical properties of materials.

Materials Required

Task 1: Small sized tarnished or dull copper items (plates/strips), vinegar, baking soda, lemon juice, table salt, tamarind (imli) juice, liquid detergent, detergent powder, coal or wood ash, curd, sand paper (zero grade) etc.

Task 2: Tarnished copper plates/strips, hand gloves, used toothbrush, watch glass/ saucer, droppers and small spoons/spatulas, water. Three or four of these cleaning agents: Talcum powder, baking soda, detergent powder, sand (or white rangoli powder), dry soil, common salt, ash.

Task 3: Solid cleaning agents used in Task 2, and any two or three of the cleaning agent from this list: vinegar, lemon juice, curd and tamarind (imli) juice, used toothbrush, watch glass/ saucer etc.

Task 4: Three to four of each of the solid and liquid cleaning agents (as used in tasks 2 and 3), litmus papers (red and blue), turmeric powder or turmeric paper, watch glass (or saucer), droppers and small spoons/spatula.ellus, luctus nec ullamcorper mattis, pulvinar dapibus leo.

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