Question

question 5 (1 point) is this a chemical or a physical change? a iron nail is left in a puddle of water and begins to rust. a chemical change b physical change

Explanation:

A chemical change results in the formation of a new substance. Rusting of iron is a chemical reaction where iron (Fe) reacts with oxygen ($O_2$) and water ($H_2O$) to form iron - oxide (rust), a new substance. A physical change only alters the physical state or appearance without changing the chemical composition. Since rusting creates a new chemical compound, it is a chemical change.

Answer:

a. Chemical change