Melting
What is melting?
Melting is the process where a solid is heated and transformed into a liquid.
What is freezing?
Freezing is the process where a liquid is cooled and transformed into a solid.
What is evaporation?
Evaporation is the process by which a liquid is heated and transformed into a gas.
What is condensation?
Condensation is the process by which a gas is cooled and transformed into a liquid.
What is sublimation and deposition?
Sublimation is the phase change in which a solid turns directly into a gas without first becoming a liquid. Deposition is the phase change in which a gas transforms directly into a solid without passing through the liquid state.
What happens to particles during melting?
During melting, particles gain energy and begin to break free from their fixed positions, allowing them to move past one another.
Describe the process of freezing.
During freezing, particles lose energy and arrange themselves into a fixed structure.
Differentiate evaporation and boiling.
Evaporation occurs only at the surface of the liquid and can happen at any temperature below boiling, while boiling occurs throughout the entire liquid at its boiling point.
What happens to gas particles during condensation?
During condensation, gas particles lose energy and intermolecular attractions pull them closer together.
How do particles behave during sublimation?
During sublimation, particles gain enough energy to skip the liquid phase and move freely as gas.
Give 3 examples of melting.
An example of melting is the melting of an ice cube a wax candle, butter in a pan
What happens to particles during freezing?
Freezing releases heat as particles settle into a rigid structure.
Describe particle movement during evaporation and boiling.
During evaporation & boiling, fast-moving surface particles escape into the air, resulting in rapid, random movement.
Give examples of deposition
An example of condensation is the formation of dew drops or clouds.
What happens to gas particles during deposition?
During deposition, gas particles rapidly lose energy and form solid bonds.
What is the energy flow during melting? What type of reaction
The energy flow during melting is the absorption of heat. Exothermic Reaction.
Give examples of freezing
Ice Cube, Lava, Clay
Why can evaporation occur below the boiling point?
Evaporation can occur below the boiling point because surface particles can gain enough energy to escape into the gas phase.
What is the energy flow during condensation?
The energy flow during condensation is the release of heat as attractions reform between particles. (Exothermic reaction)
Why does sublimation cause a large increase in volume?
Sublimation causes a large increase in volume because solid particles gain enough energy to disperse widely as gas.
How does melting affect the shape of a solid?
Melting changes the shape of a solid from a definite shape to an indefinite one, as it takes the shape of its container.
Why does freezing release heat?
Freezing releases heat because the particles lose energy as they lock into a fixed arrangement.
What are the conditions needed to meet for boiling to occur?
Equal Liquid vapor pressure and external pressure
Why does condensation decrease volume?
Condensation decreases volume because the gas particles come closer together, occupying less space.
Why does deposition release heat?
Deposition releases heat because energy is expelled as bonds form between particles.