The physical state(s) present when a substance is melting is (are)
O liquid + gas
• solid
• gas
O solid + liquid
O liquid
The physical state(s) present when a substance is melting is solid + liquid.
The physical states present when a substance is melting are:
1. Solid: The substance exists in a solid state before melting, where the particles are closely packed and have a fixed arrangement.
2. Liquid: As the substance is heated, it starts to melt and transitions into a liquid state. In this state, the particles are more loosely packed and are able to move around each other.
So, the correct answer is:
O solid + liquid