Classify each of the following as a pure substance or a mixture:

a. a soft drink

b. propane$\left({\mathrm{C}}_3{\mathrm{H}}_8\right)$

c. a cheese sandwich

d. an iron ($Fe$) nail

e. salt substitutelocalid="1651731802252" $\left(KCI\right)$

(a) A pure substance or a mixture of soft drink

(a) A potable may be a mixture of water, sugar, color, flavor, soda, and artificial sweetener. This mixture is physically mixed but not chemically combined.
Therefore, a potable may be a mixture

(b) A pure substance or a mixture of Propane

(b) Propane $\left({\mathrm{C}}_3{\mathrm{H}}_8\right)$could be a gas.it's derived fromgas and petroleum. Itcan't be separated by any physical oractivity.
Therefore, propane $\left({\mathrm{C}}_3{\mathrm{H}}_8\right)$may be a pure substance.

(c) A pure substance or a mixture of cheese sandwich.

(c) A cheese sandwichis formed of bread and cheese.it should also include vegetables or meat and condiments. This mixture is physically mixed but not chemically combined.
Therefore, a cheese sandwichcould be a mixture.

(d) A pure substance or a mixture of Iron.

(d) Iron ($Fe$) is a part.it's composed ofjust one form of material. Itcan't be separated by any physical ornatural action.
Therefore, an iron ($Fe$) nailmay be a pure substance

(e) A pure substance or a mixture of Salt substitute

(e) Salt substitute$\left(KCI\right)$ means K-Dur$20$.it's a compound.it's a composed of atoms of two or more elements.they're chemically combinedwithin the same proportion. Therefore, salt substitute$\left(KCI\right)$ could be a pure substance.