Effectively, the salt molecules stop some of the water molecules from touching the part of the water that is becoming solid. At 32 degrees Fahrenheit, water molecules enter and leave the freezing state at an equal rate.
When salt is present, however, it upsets this process, as it prevents the molecules from coming together. It is like having a handful of weak magnets. They come together easily if nothing is in between them, but if other things are present, such as marbles, the magnets have a more difficult time attracting one another.
Water with salt in it has to be colder for it to solidify. Lowering the temperature of water makes the molecules move more slowly. In time, the molecules entering and leaving the solid part of the water equal out again, as everything is moving more slowly, and it is able to freeze.Learn More
Copper is a metallic solid in its conventional state. As a solid, the molecules of copper occupy a stable configuration known as a crystal lattice. If the temperature is above 1,984 degrees Fahrenheit, solid copper melts and becomes a liquid. Copper becomes a gas at temperatures above 4,643 degrees Fahrenheit.Full Answer >
Heat is involved in chemical change in two ways; chemical changes either result in heat being added to or removed from an object, and chemical changes require a certain amount of heat before they can take place. Both of these two mechanisms of chemical change involve the heat characteristics of the involved substance or substances and the environment in which the chemical change is taking place.Full Answer >
Fire is not a form of matter; it is a chemical reaction. Fire is not made of any actual materials, but instead it is the result of chemical reactions from heating certain materials while they are in contact with oxygen.Full Answer >
Evaporation is a cooling process. It occurs because some particles in a liquid acquire more than average kinetic energy. Thus, when these particles escape from the liquid's surface as vapor or gas, they leave a cooling effect due to energy loss.Full Answer >