Aspirin contains other ingredients not related to its function, such as corn starch and cellulose. because of this, aspirin is classified not as a pure substance but as a (what would be in the blank? )

As a mixture or more precisely a homogenous mixture.

homogeneous mixture

Explanation:

Matter can be classified as : Pure substance and mixtures

The mixture is a matter which contains more than one component which can be separated by physical methods The mixture is of two types

a) homogeneous mixtures: where the components are not physically distinct

b) heterogeneous mixtures: where the components are physically distinct.

Pure substances: these are the substances which are pure. They can be element or compound

Elements are the purest form of a substance

Compounds are formed by chemical combination of elements.

So aspirin which contains starch ( a compound) and cellulose (a compound) is a mixture. The mixture is homogeneous mixture.