Question

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Answer 1

12. 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.

13. When one substance dissolves into another, a solution is formed. ... The solute is the substance that is being dissolved, while the solvent is the dissolving medium. Solutions can be formed with many different types and forms of solutes and solvents.

14. Nitrogen oxides and Sulfur dioxides from fossil fuel burning make their way to the atmosphere where they combine with oxygen to form nitric acids and sulfuric acids. These acids are dissolved in evaporated water from the land surface which results in acid rain formation. When the rain falls it distribute the pollutants into the soil, plants and also pose health risk to human beings.

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