Select all that apply.
Which of the following statements are true?
A solid can diffuse into a liquid, but a solid cannot diffuse into another solid.
A solid can diffuse into both a liquid and another solid.
Aliquld can diffuse into another liquid.
Agas can diffuse into another gas.

1. A solid can diffuse into a liquid, but a solid cannot diffuse into another solid.

3. A liquid can diffuse into another liquid.

4. A gas can diffuse into another gas.

Explanation:

When an object is in liquid or gas form, they can easily move and spread. This is because the molecules are packed loosely. Since they can move freely, diffusion on and into gas/liquid can be easily achieved.  

Solid form can diffuse into liquid too. Seawater is mostly made of water and solid salt. But diffusing a solid into a solid is not possible since the molecule is tightly packed and barely moves. The diffusion might be happening, but at a really slow rate that we can assume it is not.

i am pretty sure it is c because when people are closer together, they cannot move as freely. picture being in a mostly full elevator, for instance. the people are right next to you, and you can barely move.

the box does not move because you need to use a force greater than 300 n. you are only using 50 n. it needs to at least be 301 n for the box to move because then it is an unbalanced force and it will move the way that the greater force is pushing it. if you use only 300 n it will be a balanced force and will not move because the force you are exerting on the   box is the same as its force.

hope this !

im sorry if i went too in depth, i am going to include a link to a video on khan academy that will explain this.   hope that you like the video and that it explains more in detail to you.

that is the link.