A substance containing only one type of atom or one type of molecule is a
pure substance. Most of the matter around us, however, consists of
mixtures of pure substances. Air, wood, rocks and dirt are examples of
such mixtures. Mixtures can be classified as Homogeneous and
Heterogeneous.
Homogeneous Mixtures
Homogeneous Mixtures are uniformly mixed on an atomic or molecular level.
These types of mixtures are also called solutions. Below are a few examples
of homogeneous mixtures.
They are mixtures in which the parts do not appear separate and would be
difficult to take apart.
Air is a homogeneous mixture (gaseous solution) of
N2, O2, H2O, and CO2
gases. In contrast, a container of each gas by itself would be a pure
substance. Only when they are mixed on a molecular level are they a
homogeneous mixture (or gaseous solution).
Brass is a homogeneous mixture (solid solution) of copper and zinc. Again
each metal by itself is a pure substance. Only when they are mixed are
they a homogeneous mixture (or solid solution).
Heterogeneous Mixtures
Heterogeneous mixtures are not uniformly mixed on an atomic or molecular
level. The constituents appear separate and would be easy to take apart
using some physical property or properties of the parts of the mixture.
For example,
Salt and pepper, chocolate chip cookies, or a Twix™ candy bar, ...
are all examples of heterogeneous mixtures, where substances are not mixed
on a molecular level.
Soda is a heterogeneous mixture (liquid solution) of
few other substances.
H2O, C6H12O6, and a
Homogeneous
salty water (where the salt is completely dissolved)
brewed tea or coffee
soapy water
a dilute solution of hydrochloric acid
hard alcohol
wine
1. Blood
2. Sugar solution when sugar is completely dissolved.
3. Mixture of alcohol & water
4. A glass of orange juice
5.salty water (where the salt is completely dissolved)
6.brewed tea or coffee
7.soapy water
8.a dilute solution of hydrochloric acid
9.hard alcohol
10.wine
heterogeneous
sandy water
carbonated beverage or beer (the CO2 gas is mixed with the liquid)
orange juice with pulp in it
water with ice cubes in it
chicken noodle soup
1. Oil & water.
2. Soil sample
3.sandy water
4.carbonated beverage or beer (the CO2 gas is mixed with the liquid)
5.orange juice with pulp in it
water with ice cubes in it
6.chicken noodle soup