Nothing shrinks copper tube.
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When copper oxide is heated in a test tube with carbon, carbon acts as a reducing agent and reacts with copper oxide to form copper metal and carbon dioxide. This is a type of redox reaction where copper gains electrons from carbon, resulting in the reduction of copper oxide to copper.
In rubber electrons cannot freely move among atoms as in copper.
Usually Alloy steel is used, copper and brass are also used as boiler tube materials
Yes, you can create a simple battery by holding a copper tube and a steel tube in an acidic solution like lemon juice, which will generate a small electric current. By wiring this to a light bulb, you can light it up. This experiment demonstrates the principles of making a battery using dissimilar metals.
A balloon shrinks as it grows because its walls expand to accommodate the increasing amount of air inside.