Answer:
The true statement is: "There is more energy in steam at 100°C than water at 100ºC."
This is because steam at 100°C has more thermal energy than water at 100ºC because it has undergone a phase change from liquid to gas, which requires additional energy.
The other statements are not true:
To condense steam, the temperature must increase, not decrease. Condensation is the process by which a gas (steam) changes phase to a liquid, and this requires the removal of energy, usually through cooling.
To melt ice, the temperature must increase. Melting is the process by which a solid (ice) changes phase to a liquid, and this requires the addition of energy, usually through heating.
Iron can exist in all three states of matter (solid, liquid, and gas) depending on the temperature and pressure. However, at room temperature and standard atmospheric pressure, iron is a solid.
Step-by-step explanation: