Answer:
Endothermic. Endothermic phase changes take in heat from the surrounding environment; they include melting, sublimation and boiling. ... For example, the forces that hold iron atoms together are strong, so it takes high temperatures to melt iron.
Explanation:
Answer:
Dalton's theory are based on the two laws that are: Law of conservation of mass and law of constant composition. This theory basically described their properties of atoms.
This theory state that all the atoms are made up of matter which are invisible and in the elements all the atoms are identical in mass and properties.
H2SO4 (1) H20 (g) + SO3 (g)
