Question

classify each of the following as a pure substance or a mixture: 1.a soft drink 2.a cheese sandwich salt substitute ( kcl ) 3.propane ( c3h8 ) 4.an iron ( fe ) nail

Answer 1

A soft drink and cheese sandwich are mixtures while salt substitute (KCl), propane (C3H8) and an iron (Fe) nail are pure substances. Mixtures contain various substances mixed together, and pure substances have a consistent composition of either an element or a compound.

Step-by-step explanation:

The substances and mixtures question you have asked involves the understanding of basic definitions in chemistry. In essence, a pure substance is a material that has a consistent composition and cannot be separated into its constituent substances, like elements or compounds. A mixture, on the other hand, is a combination of two or more pure substances that retain their individual properties and can be separated.

1. A soft drink is a mixture because it contains various substances like water, sugar, and flavorings mixed together.
2. A cheese sandwich is a mixture as it is composed of various components such as bread, cheese, and possibly other fillings.
3. Salt substitute (KCl) is a pure substance. It's a compound with a fixed composition.
4. Propane (C3H8) is also a pure substance; again, it is a compound with a consistent structure.
5. An iron (Fe) nail is an example of a pure substance as it is primarily composed of only iron, which is an element.

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