No, both rust forming on a metal gate and snails growing shells are examples of physical changes. Both involve a change in the physical state or appearance of the material, rather than a chemical transformation. Rust forming occurs when iron in the metal gate reacts with oxygen in the air, resulting in the formation of iron oxide. This is a physical change as the composition of the gate remains unchanged. Similarly, snails naturally grow shells as a protective covering, which is a physical change in their body structure.
But rust is a chemical change. I do not understand why.
Apologies for the confusion in my previous response. You are correct, the formation of rust on a metal gate is indeed a chemical change. Rust, also known as iron oxide, is formed through a chemical reaction between iron, oxygen in the air, and water or moisture. This process, called oxidation, causes a chemical transformation in the composition of the metal, leading to the formation of a new substance (iron oxide) with different properties than the original metal. Therefore, both rust forming on a metal gate and snails growing shells are examples of chemical changes.
