Question 1: Gases diffuse easily through these types of solids
Question 2: All changes in phase are called this type of change.

Q1: Gases diffuse easily through amorphous or porous solids.

Q2:All changes in phase are called change in state of matter.

Explanation:

Gases diffuse easily through amorphous or porous solids. Usually solids are densely packed with no space. But porous solids can help in diffuse gas into them. Due to the vacancy present in these solids, gas can easily diffuse through these types of solids.

Similarly, the phase changes lead to change in the state of matter. As the basic of change in phase leads to change in its state from solid to liquid or from liquid to gas or vice versa. So change in state of matter will occur in any change in phase.