Question

Phosphorus burns in air producing phosphorus pentoxide is chemical change give reason

Answer 1

The phosphorous gets mixed with the oxygen present in the air, which causes the formation of phosphorous pentaoxide, which is a new chemical composition and a change in state of matter. Thus it is a chemical change. The chemical properties of reactant and product has changed. 

Answer 2

Answer: Yes, it is a chemical change.

Explanation:

A chemical change is defined as the change in which a new substance is formed and change in chemical composition takes place. these reaction are usually irreversible reactions.

Indicators that are used to identify a chemical change are:

• Formation of a precipitate
• Color change
• Formation of bubbles
• Formation of a gas
• Change in temperature
• Noticeable odor

When phosphorous burns in air, it produces dense white fumes of phosphorous pentoxide.

The equation for the above reaction follows:

$P_4(s)+5O_2(g)\rightarrow P_4O_{10}(s)$

Phosphorous pentoxide exists in a dimeric form. As, there is releases of gas and a specific color is seen. Therefore, it is a chemical change.