homogeneous mixture and heterogeneous mixture definitions
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Answer:
Heterogeneous Mixtures
A heterogeneous mixture is a mixture in which the composition is not uniform throughout the mixture. Vegetable soup is a heterogeneous mixture. Any given spoonful of soup will contain varying amounts of the different vegetables and other components of the soup.
A phase is any part of a sample that has a uniform composition and properties. By definition, a pure substance or a homogeneous mixture consists of a single phase. A heterogeneous mixture consists of two or more phases. When oil and water are combined, they do not mix evenly, but instead form two separate layers. Each of the layers is called a phase.
Oil and water form a heterogeneous mixture
Figure 2.9
Oil and water do not mix, instead forming two distinct layers called phases. The oil phase is less dense than the water phase and so the oil floats on top of the water.
In the vegetable soup example, one phase would be the liquid soup itself. This phase has vitamins, minerals, and other components dissolved in the water. This phase would be homogeneous. The carrots, peas, corn, or other vegetables represent other phases of the soup. The various vegetables are not mixed evenly mixed in the soup, but are spread around at random.
There are a large number of heterogeneous mixtures around us. Soil is composed of a variety of substances and is often of different composition depending on the sample taken. One shovel may come up with dirt and grass while the next shovel could contain an earthworm.
Smog is another example of a heterogeneous mixture. This murky collection of pollutants can be a mixture of water and contaminants from burning gasoline or plastics mixed with nitric oxide derivatives and ozone. You can see that the smog distribution in the air illustrate below is not evenly spread out, but varies from one part of the atmosphere to another.
Smog is a heterogeneous mixture
Figure 2.10
Smog in New York City.
SUMMARY
A heterogeneous mixture is a mixture in which the composition is not uniform throughout the mixture.
A phase is a separate layer in a heterogeneous mixture.
Answer:
homogeneous mixture :those mixtures in which the substances are completely mixed together and are indistinguishable from another are called homogeneous mixture
heterogeneous mixture :those mixture in which the substances remain separate and one substance is seperated throughout the other substances as small particles droplets or bubbles are called heterogeneous mixture