Title EDX Topic 1 states .pdf ✅

Topic 1 1 States of Matter

Change of States: It’s when the matter change from state to another one Changing the physical state of a substance can be done by: Heating or Cooling. Changes of states are reversible physical changes. Look at the change of states that occurs when water is heated and cooled: Topic 1 4 Changes of State Changes of State By heating a solid, particles gain kinetic energy & vibrate more. When temperature reaches the melting point, particles use all heat energy to break the forces between them & turn to liquid. Melting Point: It's the temperature at which solid melts & turns into a liquid. Melting By heating a Liquid, particles gain kinetic energy, move faster & further apart. When temperature reaches the boiling point, particles use all heat energy to break the forces between them & turn to Gas. Boiling Point: It's the temperature at which Liquid boils & turns into a Gas Boiling
Topic 1 Slow Occurs at any temp. below the boiling point Only particles at the surface turn to a gas No bubbles present Rapid Occurs only at the boiling point Occurs throughout the liquid Bubbles present Evapouration Boiling 5 A volatile substance is a substance that evaporates easily. Note! Sublimation It's the change of state from solid to gas directly. e.g. sublimation of iodine or dry ice *The reverse (from gas to solid) of Sublimation is called deposition. Condensation By cooling a gas, particles loses kinetic energy, move slower & get closer each other. Forces of attraction then start to form between them and hold them together. Freezing Freezing Point: It's the temperature at which Liquid freezes & turns into a Solid. If a liquid is cooled down the particles will start moving slower and start forming attraction forces that will eventually hold them in a fixed position. A substance is A solid at any temperature below its melting point A gas at any temperature above its boiling point A liquid at any temperature between its boiling and melting point Note!