Definitions

• mixture is a composition of two or more pure substances
• phase is a part of a mixture with distinguishible chemical and/or physical properties

Homogeneous mixtures

• homogeneous mixture is a mixture with only one phase
• homogeneous mixtures created via dissolving a solid or gaseous substance in liquid is called a solution
  • in equations, it is usually written as $\odot$ (pronounced “sol”)
  • solutions can technically be solid (e.g. steel - homogeneous mixture of carbon and steel), but they are usually refered to differently (e.g. alloys)

Heterogeneous mixtures

• heterogeneous mixture is a mixture with two or more phases
• the two phases of this type of mixture are clearly distinguishible by naked eye (e.g. oil in water)

Colloids

• colloid is a mixture with two or more phases which are not easily distinguishible by naked eye
• more complex machines ought to be used to determine whether a mixture is homogeneous or colloidal

Reactant and product mixtures

• reactant mixture is a mixture that undergoes a reaction
• product mixtrue is a mixture tha conatains the products of a reaction