Mixture




 

In compounds, without chemical bonding or other chemical change, so that each ingredient substance retains its own chemical properties and makeup. [1]

While there are no chemical changes in a mixture, physical properties of a mixture, such as its separated by any mechanical means. Mixtures are either homogeneous or heterogeneous.

Homogeneous Mixtures

Main article: Homogeneity (physics)

Homogeneous mixtures are mixtures that have definite, consistent composition and properties. Particles are uniformly spread. For example, any amount of a given mixture has the same composition and properties. Examples are alloys (but not all). A homogeneous mixture is a uniform mixture consisting of only one phase. Examples are gasoline and margarine.

Solutions

A solution is a homogeneous mixture of two or more substances (the Solubility is a compound property.

Colloidal Dispersions

Main article: Colloid

Colloids are another type of homogeneous mixture in which the particles of one or more components have at least one dimension in the range of 1 to 1000nm, larger than those in a solution but smaller than those in a suspension. [2] In general, a colloid or colloidal dispersion is a substance with components of one or two phases. A colloid will not settle if left to sit. Jelly, milk, blood and glue are examples of colloid dispersions.

Heterogeneous Mixtures

Main article: Heterogeneous

Heterogeneous mixtures are mixtures with inconsistent, non-uniform composition. The parts of a heterogeneous composition can be mechanically separated from each other. Examples include salad, trail mix and granite.

Suspensions

Main article: Suspension (chemistry)

A heterogeneous mixture in which the particles, of at least one component is larger than 1μm (1000nm) in at least one dimension, larger than colloidal particles. [2] Unlike colloids, suspensions will eventually settle. An example of a suspension would be sand in water. Particles of suspensions exhibit the Tyndall effect, that is, they are big enough to disperse light, like colloids.

See also

References

  1. ^ Atkins' Physical Chemistry, 7th Ed. by Julio De Paula, P.W. Atkins ISBN 0198792859
  2. ^ a b c Chemistry: Matter and Its Changes, 4th Ed. by Brady, Senese, ISBN 0471215171
 
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