what are the properties of homogenous and heterogeneous mixture
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Explanation:
A MIXTURE is a combination of two or more substances that are not chemically united and do not exist in fixed proportions to each other. Most natural substances are mixtures.
In the graphic on the left there are four substances - water, alcohol, oil, and food color dye.
MIXTURES
PURE COMPOUNDS
A mixture can be physically separated into pure compounds or elements. A pure compound has a constant composition with fixed ratios of elements.
Just about everything that you can think of is probably a mixture. Even the purest of materials still contain other compounds as impurities. Although it is almost physically impossible to isolate absolutely pure substances, a substance is said to be pure if no impurities can be detected using the best available analytical techniques.
Mixtures may exhibit a changing set of physical properties.
For example, mixture of alcohol and water boils over a range of temperatures.
Physical properties such as boiling point or melting point of pure substances are invariant.
For example, pure water boils at 100 degrees C
HOMOGENEOUS MIXTURES
HETEROGENEOUS MIXTURES
The prefixes "homo"- indicate sameness The prefixes: "hetero"- indicate difference.
A homogeneous mixture has the same uniform appearance and composition throughout. Many homogeneous mixtures are commonly referred to as solutions.
A heterogeneous mixture consists of visibly different substances or phases. The three phases or states of matter are gas, liquid, and solid.
Graphic on the left of "Dancing Raisins" shows liquid, solid, and gas substances in a heterogeneous mixture.
Particle size distinguishes homogeneous solutions from other heterogeneous mixtures. Solutions have particles which are the size of atoms or molecules - too small to be seen.
A colloid is a homogeneous solution with intermediate particle size between a solution and a suspension. Colloid particles may be seen in a beam of light such as dust in air in a "shaft" of sunlight. Milk, fog, and jello are examples of colloids.
In contrast a suspension is a heterogeneous mixture of larger particles. These particles are visible and will settle out on standing. Examples of suspensions are: fine sand or silt in water or tomato juice.
Corn oil is homogeneous, White vinegar is homogeneous. A sugar solution is homogeneous since only a colorless liquid is observed. Air with no clouds is homogeneous. For example beach sand is heterogeneous since you can see different colored particles. Vinegar and oil salad dressing is heterogeneous since two liquid layers are present, as well as solids. Air with clouds is heterogeneous, as the clouds contain tiny droplets of liquid water.
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