Sodium chloride has a high melting point because of the strong electrostatic attraction between its positive and negative ions; this requires more heat energy to overcome. All ionic compounds have high melting points for this reason.
The difference in melting points for ionic compounds can be explained by the size of the ions themselves; smaller ions are able to get closer, and this increases the strength of the electrostatic charge between them. Another factor affecting the melting point of ionic compounds is the number of charges on the ion. For example, magnesium oxide has a charge of +2 and -2, which is stronger than sodium chloride's ionic charge of +1 and -1.Learn More
The additional molecules in milk keep its boiling point slightly higher than water, which boils at 100 degrees Celsius or 212 degrees Fahrenheit. The chemical composition of milk dictates the boiling point and so there is no standard boiling point.Full Answer >
Water heats slower than most other substances. It has a high specific heat capacity. This property helps the Earth's temperature remain constant, with water trapping the sun's heat during the day and releasing it slowly at night.Full Answer >
Burning, or rather combustion, leaves you with a different material than the one with which you started. A chemical change occurs if a new substance is created and most of the time cannot be reversed.Full Answer >
The normal phase of silicon is a solid at room temperature. It has a melting point of 1410 degrees Celsius. Silicon exists in two solid forms, one crystalline and the other amorphous. It is a nonmetal.Full Answer >