changes in matter

• A physical change is a change in which no new substances are formed .
• Freezing - the opposite of melting; when a liquid becomes a solid at its freezing point.
• Melting - the process whereby a solid turns into a liquid at its melting point.
• Examples of physical changes include melting, freezing, boiling, evaporating, condensing, dissolving, filtering, crystallising, changing state.
• Freezing - the reverse of melting; when a liquid becomes a solid at its freezing point.
• Examples of physical changes include melting, freezing, boiling, evaporating, condensing, dissolving, filtering, crystallising, changing state, separating into components.
• Melting - the process whereby a solid turns to liquid at its melting point.
• There may be temporary change in color, temporary and state of the substances but no new substances are formed in the physical change.
• A chemical change is a change in which one or more new substances are formed.
• When a solid substance is heated, the particles of the solid vibrate more strongly.Finally, these particles are able to overcome the forces that hold the particles in their fixed position. The solid then turns into a liquid. This is called melting.
• The temperature at which a solid changes to a liquid state at one atmospheric pressure is called melting of that solid.
• Boiling is the rapid vaporisation of a liquid,which occurs when a liquid is heated to its boiling point.
• The temperature at which the vapour pressure of the liquid is equal to the atmospheric pressure of the surrounding is called the boiling point.
• Vaporisation is the process that occurs when a chemical or element is converted from a liquid to a vapour.
• Evaporation is the process of a substance in a liquid state changing to a gaseous state due to an increase in temperature and/or pressure.
• Freezing is the process in which a liquid becomes sufficiently cold to change into a solid.
• Freezing point is the temperature at which a liquid becomes a solid.
• Condensation is the change from a gaseous state to its liquid state.
• Melting is the process by which a solid turns into a liquid as it absorbs heat energy.
• Sublimation is the change of solid state directly into gaseous state without melting.
• Deposition is the direct solidification of a vapour by cooling; the reverse of sublimation.