Changing State Flashcards
Substances can change from one state to another!
Solid is heated - particles gain more energy
Particles vibrate more - weakens the forces that hold the solid together
At the melting point the particles have enough energy to break free from their positions. This is called melting and the solid turns into a liquid.
Liquid is heated the particles gain more energy
Particles move faster due to more energy - which weakens and breaks the bonds holding the liquid together
At the boiling point, particles have enough energy to break their bonds. This is boiling (or evaporating). The liquid becomes a gas
Gas cools - particles have no longer enough energy to overcome the forces of attraction between them.
Bonds form between the particles
At boiling point so many bonds have formed between the gas particles that the gas has become a liquid. This is call Condensing.
Liquid cools the particles have less energy so move around less
Not enough energy to overcome the attraction between the particles so more bonds form between them
At the melting point so many bonds have been formed between particles that they’re held in place. Liquid becomes a Solid, this is Freezing
