Understanding the Particle Model The particle model of matter explains the behavior and properties of substances by considering them as composed of tiny particl...
The particle model of matter explains the behavior and properties of substances by considering them as composed of tiny particles. This model provides a fundamental understanding of the three states of matter: solid, liquid, and gas.
Density is a measure of how much mass is contained in a given volume. It is calculated as density = mass / volume. Solids and liquids have a fixed density, while gases are compressible, so their density varies with pressure and temperature.
Regular Solids: Measure the dimensions and calculate the volume, then divide the mass by the volume.
Irregular Solids and Liquids: Use displacement methods, such as immersing the object in water and measuring the displaced volume.
Internal energy is the total kinetic and potential energy of particles in a substance. Heating a substance increases its internal energy, either by raising the temperature (increased particle motion) or causing a change of state (breaking intermolecular bonds).
Specific heat capacity (c) is the amount of energy required to raise the temperature of 1 kg of a substance by 1°C. Specific latent heat (L) is the energy required to cause a phase change (fusion or vaporization) for 1 kg of a substance, given by E = m × L.
For a fixed mass of gas, the pressure (P), volume (V), and absolute temperature (T) are related by the equation PV = nRT, where n is the amount of gas and R is the gas constant. This relationship can be explained by the particle model, where increased temperature or decreased volume leads to more frequent particle collisions and higher pressure.