How can a boiling point be lower than its freezing point?
It can't (unless the substance sublimes instead of having a solid state, in which case they are in effect the same).
It depends what chemical or compound you are comparing the boiling point to. Ethanol has an atmospheric pressure boiling point of 78.1 °C (172.6 °F). This is slightly lower than the boiling point of water at the same pressure, much lower than the boiling point of iron, much higher than the boiling point of bromine.
Dissolving a material in water elevates the boiling point. Kool-aid in water has a higher boiling point than water alone. The freezing point of the Kool-aid solution, however, will be lower than the freezing point of water. This chemical principle is why a 50/50 solution of antifreeze and water is used as a coolant in cars -- not only does it prevent the coolant from freezing (and cracking the engine block), it also prevents the…
Sure, if the temperature of the gas is lower than the evaporation point of the substance, the gas turns into liquid. If the temperature then reaches the freezing point, the liquid will turn into a solid. The effect can be also reversed. If the melting point is reached, the solid will turn to a liquid, then if the boiling point is reached, the liquid will turn into gas. You must be able to lower the…
The freezing point of table salt water is lower than the freezing point of pure water. This is because table salt (and other non-volatile solutes) cause freezing point depression. However, the exact freezing point of the solution depends on the concentration of salt. A higher concentration causes more freezing point depression than a lower concentration.
This is a colligative property. Adding a solute will increase the boiling point and decrease the freezing point. The reason has to due with intermolecular forces, and interruption thereof. When water molecules have solute in between them, the temperature has to be lower than normal in order for them to freeze.
Salt water has a different freezing point than regular water. Celsius was modeled after the freezing and boiling points of water and Fahrenheit was modeled after the freezing and boiling points of salt water. They are very different measuring scales which means that a solute(salt) can change the freezing and boiling points of a solvent(water).