Which uses of iron are due to its chemical properties? Check all that apply.
producing colored sparks in fireworks changing from liquid to gas at 2,862°C
rusting in the presence of water and oxygen
changing from solid to liquid if heated to 1,538°C
conducting electricity and heat
The Correct Answer and Explanation is :
The correct answers for uses of iron due to its chemical properties are:
- Rusting in the presence of water and oxygen
- Changing from solid to liquid if heated to 1,538°C
Explanation:
Iron’s chemical properties are responsible for certain behaviors or reactions that make it useful in various applications. Let’s break down these chemical properties in detail:
- Rusting in the presence of water and oxygen:
Iron is prone to corrosion, a chemical reaction known as rusting, when exposed to water and oxygen. This process involves the oxidation of iron, where iron reacts with oxygen in the air and moisture in the environment to form iron oxide (Fe₂O₃), commonly known as rust. This property has both positive and negative implications. On the one hand, rusting can be detrimental, causing iron to deteriorate over time. However, rusting is also a key chemical process when iron is deliberately exposed to oxygen and water to form protective coatings, like the “patina” on iron structures or steel, which helps prevent further corrosion. - Changing from solid to liquid if heated to 1,538°C:
Iron has a melting point of 1,538°C, which is the temperature at which it undergoes a phase transition from a solid to a liquid. This is a physical change influenced by its atomic structure and the energy required to overcome the bonds holding iron atoms together. While this is a physical property, the ability to melt and re-solidify is central to its use in various applications such as casting and manufacturing steel.
The other options listed refer to physical properties or specific behaviors rather than chemical properties:
- Producing colored sparks in fireworks: This behavior is due to the physical properties of iron when it is heated to a high temperature in a fireworks display, but not due to any chemical reaction specific to iron.
- Changing from liquid to gas at 2,862°C: This refers to iron’s boiling point—another physical property, not a chemical one. It defines the temperature at which iron transitions from a liquid to a gas.
Lastly, conducting electricity and heat is a physical property of iron, not a chemical property. It is due to iron’s ability to allow the flow of electrons or heat through its atomic structure, but does not involve any chemical change.