MATTER Mixture It is composed of two or more pure substances combined through physical means in varying proportions. Each pure substance in a mixture retains its property. The components of a mixture can be separated by physical means depending on the states of the pure substances in a mixture. It can be classified into two namely homogeneous and heterogeneous mixtures. Homogeneous Mixture It has uniform composition and properties. It has only one phase in which it is hard to determine the components of the mixture visually. Heterogeneous Mixture It has varying composition and properties. It may have two or more phases since the individual substance is visually distinct Solution, Suspension and Colloid Mixtures can also be classified based on particle size namely solution, suspension, and colloid. A solution is a homogeneous mixture while a suspension and a colloid are heterogeneous mixtures. 1. Solution It has two or more substances uniformly dispersed throughout the mixture. It forms a single phase It has the smallest particle size. Particles of a solution are invisible to the naked eye. 2. Suspension The components of a suspension separate over time due to the influence of gravity. It has the largest particle size compared to the other types of mixtures. The particles in a suspension are visible to the naked eye 3. Colloid The particles in a colloid only remain suspended in the medium when viewed using a microscope. It has an intermediate particle size compared to solutions and suspensions. The particles appear to be invisible to the naked eye. Tyndall Effect Colloidal particles exhibit Brownian movement and cause Tyndall effect. Brownian movement is the random movement of particles suspended in gas or liquid. This random motion of particles causes the scattering of light or Tyndall effect. Tyndall effect is usually demonstrated by passing a ray of light through a sample mixture. Tyndall effect could be used to identify the mixture as solution, colloid, or suspension.