Question

A. Density = 7.874 g/mL B. Iron melts at 1808 K.
C. Iron rusts in moist air. D. Iron is soft when pure.

Answer 1

It looks like you've provided a list of properties and behaviors of iron. Each of these points can be categorized in terms of their nature and relevance. Here’s a brief evaluation of each:

A. **Density = 7.874 g/mL**: This is a physical property of iron. It indicates how much mass of iron is contained in a given volume.

B. **Iron melts at 1808 K**: This is a physical property related to the phase change of iron. It signifies the temperature at which iron transitions from a solid to a liquid state.

C. **Iron rusts in moist air**: This describes a chemical property of iron. Rusting is an oxidation reaction where iron reacts with oxygen and moisture in the environment, resulting in iron oxide (rust).

D. **Iron is soft when pure**: This is a physical property that indicates the malleability and ductility of pure iron. This softness can change when iron is alloyed with other metals, which might enhance its hardness.

If you have a specific question or would like to explore any of these points further, please let me know!