Verified answer

Answer:

Mark as brainlest please

Explanation:

Question 1:

A reversible change is a type of physical change in which the original substance can be recovered by reversing the conditions that caused the change. This means that the change is not permanent and can be reversed without affecting the chemical properties of the substance. Examples of reversible changes include melting, boiling, and dissolving.

Question 2:

Liquids and gases flow because their particles are not tightly packed and can move past each other freely. In contrast, the particles in a solid are tightly packed and arranged in a specific pattern, which makes it difficult for them to move past each other. As a result, solids maintain their shape and do not flow. However, under certain conditions, such as heating or applying pressure, solids can melt or deform, allowing their particles to move past each other and exhibit flow-like behavior.

Answer:

affected with or expressive of grief or unhappiness : downcast. b(1) : causing or associated with grief or unhappiness : depressing.