PHYSICAL SCIENCE A NOTES

 

TYPES OF MIXTURES

There are two categories of mixtures:

1.  HOMOGENEOUS
  • means "the same throughout"
  • one thing is dissolved in another
  • A homogeneous mixture is a mixture where only one thing can be seen (such as salt water).
  • They are also called SOLUTIONS.
Examples of homogeneous mixtures include air, Kool-Aid, bleach, vinegar, steel, brass, syrup, and salt water.

2.  HETEROGENEOUS
  • means "different throughout"
  • more than one thing can be seen in the mixture
  • Heterogeneous mixture are often lumpy or chunky
  • All living things (or things that were once living) are heterogeneous because cells are heterogeneous.

Examples of heterogeneous mixtures are vegetable soup, milk, pizza, Jello, and ethyl alcohol with a boiling stone in it.

 

SPECIAL MIXTURES

 

Mixtures can be homogeneous or heterogeneous.  There are three special types of mixtures:

 

Name Definition
Size of particles
Will it settle if left sitting out?
Does it scatter light?
Can it be filtered?
Examples
solutions
homogeneous mixtures where one chemical is dissolved in another microscopic NO
NO
NO
salt water, bleach, vinegar, Kool-Aid, most acids, air
colloids
heterogeneous mixtures where one chemical is dispersed in another small NO
YES!
NO
Jell-O, milk, mayonnaise, paint, fog, smoke, milk, clouds, whipped cream, Styrofoam, marshmallows, jelly, cheese, butter, mud, pudding, shaving cream, exhaust, opals
suspensions
heterogeneous mixtures where one chemical is temporarily mixed with (or "suspended" in) another medium to large YES!
YES!
YES!
vegetable soup, muddy water, a snowglobe, sulfur in water, oil and water, pulpy orange juice, Italian dressing, pepper in water