Heat is required to solid for melting and to liquid for evaporation so these are endothermic processes.
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The reaction of aqua regia is exothermic because it releases heat when the acids interact with metals, causing a very strong and aggressive reaction that can dissolve gold and platinum.
Exothermic because the heat of formation is -566. Exo- is negative and Endo- is positive.
a feather is a solid
The first 20 elements at room temperature are: Hydrogen - gas Helium - gas Lithium - solid Beryllium - solid Boron - solid Carbon - solid Nitrogen - gas Oxygen - gas Fluorine - gas Neon - gas Sodium - solid Magnesium - solid Aluminum - solid Silicon - solid Phosphorus - solid Sulfur - solid Chlorine - gas Argon - gas Potassium - solid Calcium - solid
A solid.