The diagrams show the arrangement of particles in three different physical states of substance X.
O
O
O
state 3
state 1
state 2
Which statement about the physical states of substance X is correct?
А
Particles in state 1 vibrate about fixed positions.
B
State 1 changes to state 2 by diffusion.
State 2 changes directly to state 3 by condensation.
с
D
The substance in stage 3 has a fixed volume.
Answers
Answer:
Matter can exist in one of three main states: solid, liquid, or gas.
Solid matter is composed of tightly packed particles. A solid will retain its shape; the particles are not free to move around.
Liquid matter is made of more loosely packed particles. It will take the shape of its container. Particles can move about within a liquid, but they are packed densely enough that volume is maintained.
Gaseous matter is composed of particles packed so loosely that it has neither a defined shape nor a defined volume. A gas can be compressed.
Key Terms
liquid: A substance that flows and keeps no definite shape because its molecules are loosely packed and constantly moving. It takes the shape of its container but maintains constant volume.
gas: A substance that can only be contained if it is fully surrounded by a container (or held together by gravitational pull); a substance whose molecules have negligible intermolecular interactions and can move freely.
solid: A substance that retains its size and shape without a container; a substance whose molecules cannot move freely except to vibrate.
Explanation: