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Question-The following as a physical or chemical change, give suitable reasons for the same
1Tearing a piece of paper into 100 pieces
2 Burning a piece of paper
3Hammering a nail into a piece of wood.
4Letting the nail rust
5Inflating a balloon
6Cutting an apple in half
7Iron and sulphur are heated and form a non-magnetic shiny grey substance
8Dry Ice (solid carbon dioxide -CO2) is sublimed at room temperature
9 Vinegar reacts when mixed with baking soda
10Water boils at 100 degrees Celsius
Answers
Tearing of a paper is a physical change because when the paper is torn only the appearance of the paper is changed and no new substance is formed. Since this is a physical change this change can also be reversed. Burning of paper is a chemical change when paper is burnt the chemical composition of the paper is changed at the molecular level. Subsequently the paper is turned into ash this chemical change is am irreversible change. Hence compared burning of paper is a chemical change and tearing of paper is physical change.
Combustion changes the chemical properties of the paper. A lot of what you have left over is carbon dioxide or water—two things that are fairly unambiguously not paper. You can’t make any physical changes to get the paper back.
Therefore, burning paper is a chemical change.
2 Answers for 5 points....................