As the temperature of a gaseous substance is decreased at constant pressure, it will undergo a series of physical changes. Which is the correct sequence of physical states that will be encountered?
a.Liquid, solid, gas
b.Gas, solid, liquid
c.Solid, liquid, gas
d.Gas, liquid, solid
Sometime when you don't know the answer you can think of an example you know and figure it from that.
Think about water.
As a solid it is ice, when heat is added it melts to become liquid water, and when more heat is added it vaporizes to become steam. So the logical progression is solid to liquid to gas. But this problem is the reverse of that since it starts with gas so the answer is ......
To determine the correct sequence of physical states encountered as the temperature of a gaseous substance is decreased at constant pressure, we need to understand the phase changes that occur due to changes in temperature.
When we decrease the temperature of a substance, energy is removed, causing the particles to slow down. At a certain point, the particles lose enough energy to form bonds and transition to a more ordered state.
The correct sequence of physical states that will be encountered as the temperature decreases at constant pressure is:
c. Solid, liquid, gas
Explanation:
1. Solid: As the temperature decreases, the gaseous substance will eventually reach its freezing point or melting point, at which it transitions to a solid state. In the solid phase, the particles are closely packed together, and there is a definite shape and volume.
2. Liquid: Further decreasing the temperature, the solid can undergo melting, resulting in a transition to a liquid state. The particles in the liquid phase have more freedom of movement compared to solids, as they can flow and take the shape of their container.
3. Gas: Finally, if the temperature is lowered even more, the substance can reach its boiling point or condensation point, causing it to transition into a gas state. In the gas phase, the particles are widely spread apart, and there is no definite shape or volume.
So, the correct sequence of physical states encountered as the temperature of a gaseous substance is decreased at constant pressure is solid, liquid, gas (option c).