Adding Heat Flashcards
Explain the process of melting.
Heat adds energy to the particles in a solid, making them vibrate faster. If you add enough heat, then the particles at the edges of the solid will be vibrating so violently that their bonds to neighbouring particles will loosen and they will break free from their fixed positions, allowing them to move more freely and melt away as a liquid.
Why do solids melt from the edges?
Solids melt from the edges because the edges are the first to receive heat from the outside.
Explain the process of evaporation.
Adding energy to a liquid causes the particles within it to move with increased speed and loosens bonds between the particles even more. If sufficient energy is added, the particles at the surface of the liquid move so fast that they can break away from the other particles in the liquid and escape into the atmosphere as gas particles.
Why does evaporation occur at all temperatures?
Evaporation occurs at all temperatures because there will always be some particles moving fast enough to break free from the liquid.
What is sublimation?
When a substance changes from a solid to a gas directly without first going through a liquid stage.
What are two substances that sublime and deposit?
Iodine and dry ice (solid carbon dioxide)
What happens to substances when heat is added?
Given enough heat, solids will melt into liquids and liquids will evaporate into gas.
