Particle Model of Matter

• Density(kg/m³) = mass(kg)/volume(m³)
• Internal energy is the energy stored by the particles making up a system
• A change of state requires energy
• Bond making is exothermic, meaning it releases energy
• Bond breaking is endothermic, meaning it requires energy
• Energy needed to change the state of a substance is called latent heat
• Specific Latent Heat is the energy needed for 1kg of mass to change state
• Specific latent heat for changing between solid and liquid is called specific latent heat of fusion
• Specific latent heat for changing between a liquid and a gas is called specific latent heat of vaporisation.
• Specific Latent Heat Formula: Energy= Mass(kg) x specific latent heat (j/kg)