Give one example in which both physical and chemical changes takes places

A burning candle is a great example.

First the wax melts (physical change).

Then when the melted wax is hot enough, it combines with oxygen in the air, forms carbon monoxide and carbon dioxide, and drifts away as hot gases (chemical change).  

Article i,ii and iii 

the first article of the constitution introduces the legislative arm of government - the congress of the united states, consisting of the house of representatives and the senate. the second article describes the presidency - how to select, vow, the privileges and responsibilities of the president. it also introduces the office of vice-president, who takes office after the death, resignation or incapacitation of president .article third describes the judiciary, including the supreme court. besides the supreme court, congress may establish lower-level courts, where judges and judgments are subject to the supreme court, the article enacts jury, introduces the concept of betrayal, and gives congress the right (with limitations) to establish punishment for it.