Question

some solid change directly into gas on heating without passing through a liquid phase.Give the reason why???

Answer 1

HEY MATE ⭐⭐⭐
HERE'S THE ANSWER ✌
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NAPTHALENE BALLS are the best example.

Naphthalene balls with the supply of energy directly gets converted from solid to gaseous state without going through the liquid phase. This process is known as the sublimation.

REASON:-

It's all a game of Temperature and Pressure. With lower pressures, liquid water changes to a gas at temperatures lower than 100 degrees Celsius.
If the pressure is dropped low enough, water reaches what's known as a triple point, the pressure and temperature at which a substance can exist in solid, liquid, and gaseous forms.

Below the triple point, solid water sublimates, changing directly into a gas with a temperature increase, and never passing through the liquid phase.

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Answer 2

hiii mate
hope this helps you

Sublimation occurs at temperatures below a substance's 'triple point'. The triple point is an instant in which all three phases of matter exist in equilibrium. Triple points are represented on phase diagrams. In sublimation the solid substance is heated to a point at which it turns to gas without becoming a liquid first.

Sublimation is used to purify substances in chemical processes. Usually the practice begins by placing a solid in a vessel and then heating it within a vacuum. The pressure and heat volatilize the solid, converting the compound into a gas. The impurities remain a solid in the vessel.

Sublimation is applied to the functions of dyeing and freezing. In dyes, the ink is vaporized by a heater and then cooled on the paper or fabric. As a result the color transfer is highly-defined and more easily controlled, making more intricate dying possible.

In freezers a combination of sub-zero temperatures and dry, arid air prevent frost from forming on the inside. This is managed by an internal thermostat and fan. Iodine crystals and carbon dioxide are common examples of sublimation as they sublimate at room temperature.