Why a bowl of raisin bran cereal not be pure substance?

A bowl of raisin bran cereal is not a pure substance because it is a mixture. Here's why:

* Multiple Components: It contains several distinct ingredients:

* Bran flakes (made from wheat)

* Raisins (dried grapes)

* Sugar

* Sometimes, additional ingredients like nuts, seeds, or flavorings.

* Variable Composition: The proportions of these components can vary between different brands or even different boxes of the same brand.

* Separable Components: The ingredients in raisin bran can be physically separated. For example, you could pick out the raisins or try to separate the bran flakes from the sugar.

Pure substances consist of only one type of atom or molecule. Examples include water (H2O), gold (Au), or table salt (NaCl). Mixtures, like raisin bran, are combinations of two or more substances that are not chemically bonded.