Do all things have melting points or boiling points?

Question

Need Help I Chem

Answer 1

Just about anything that undergoes a phase change has a melting point and a boiling point. This is a physical property of the molecule/compound, etc. If it undergoes a chemical change, then no melting/boiling point can be observed.

For gases, given low pressure/low enough temperature, they too can change phases to liquid and eventually solids.

The phase diagram will have all the information about melting/boiling point plotting pressure against temperature.

Answer 2

Well it hasn't melted yet but it has reached boiling point. So since it is boiling it would be in a gas form. If the temperature was -183C or more then it would be melted thus a liquid.

Answer 3

All the elements do!!!
Helium (He) is a solid at 1K and a liquid at 3K . it turns to a gas at 4K.

Many compounds decompose when heated. The classic example is the heating of Calcium Carbonate - it does not melt but whilst a solid it decomposes to Calcium Oxide and releases carbon dioxide. It is known as THERMAL DECOMPOSITION.

Don't forget Carbon Dioxide SUBLIMES it changes direct from solid to a gas. However, if the environment , particularly with respect to temperature and pressure, around CO2 is altered a liquid can be obtained.

So not everything has an acutal melting/boiling point.

Answer 4

No, not at all. Many substances, particularly organic chemicals, decompose when they are heated, and never get to their melting or boiling point.

Think of a piece of wood, for example. Does it melt when heated, or does it decompose?

Answer 5

i believe it might be solids and liquids that have a melting/boiling because a gas is past boiling try wikipedia to be sure

Answer 6

ya. except gases dont because they cant be melted or boiled into anything