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It seems that this question is from your chapter and I think that it's not a question cause it's half answer and you have to complete the left over!! For answering I need to know about your chap!
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2.Heat transfer by conduction, convection, and radiation in detail. If we heat one end of a metal bar by keeping it over a gas burner, we find that its other end also gets hot after some time. So heat is transferred from hot end of the bar to its cold end.
3.aluminum (Al), also spelled aluminium, chemical element, a lightweight silvery white metal of main Group 13 (IIIa, or boron group) of the periodic table. Aluminum is the most abundant metallic element in Earth's crust and the most widely used nonferrous metal.
Atomic number: 13
Atomic weight: 26.9815384
4.In Liquids and gases, heat transfer takes place by convection. Heat transfer takes place by the process of radiation when there are no particles of any kind which can move and transfer heat. So, in an empty space or vacuum heat is transferred by radiation.