Question

When ice is exposed to air it melts to form water and when hydrogen is burnt in air it form water how these changes differ

Answer 1

Melting of ice

• When ice is exposed to air, it melts into water and the reaction occurring is as follows

$H_2O_{(s)}\rightarrow H_2O_{(l)}$

• From the above equation, it can be observed that the chemical composition of both the reactant as well as the product is the same, but their physical form is altered (Solid ⇄Liquid).
• Thus melting of ice is considered as physical change.

Burning of Hydrogen

• When hydrogen is burnt in the presence of air, it leads to the formation of water according to the following chemical equation

$2H_2+O_2\rightarrow 2H_2O$

• From the above equation, it can be observed that the number, as well as the atom involved in the reaction, are the same, but their arrangement is changed.
• Thus it is a chemical change.

Reason for difference

• Thus it is inferred that though melting of ice and burning of hydrogen yields the same product water, the former is a physical change whereas the latter is a chemical change.

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Answer 2

Answer:

Melting of ice

When ice is exposed to air, it melts into water and the reaction occurring is as follows

From the above equation, it can be observed that the chemical composition of both the reactant as well as the product is the same, but their physical form is altered (Solid ⇄Liquid).

Thus melting of ice is considered as physical change.

Burning of Hydrogen

When hydrogen is burnt in the presence of air, it leads to the formation of water according to the following chemical equation

From the above equation, it can be observed that the number, as well as the atom involved in the reaction, are the same, but their arrangement is changed.

Thus it is a chemical change.

Reason for difference

Thus it is inferred that though melting of ice and burning of hydrogen yields the same product water, the former is a physical change whereas the latter is a chemical change.