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Question:

why does the bubble apear a few minutes later after putting aluminum sheet into dilute sulphuric acid?

why does the bubble apear a few minutes later after putting aluminum sheet into dilute sulphuric acid?

Answer:

it firstly etches off the oxide on the surface of aluminum, and then reacts with aluminum, generating bubble.
Because there is oxide on the surface of aluminum, the reaction will be quicker after polishing the oxide with abrasive paper.

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