Final answer:
Orange juice and blood are heterogeneous mixtures, paper is a heterogeneous mixture, and nitrogen is a pure substance (specifically an element). The correct classification for these substances is mixture, mixture, substance (element), and mixture respectively.
Step-by-step explanation:
Classifying Substances
To classify each substance as either a mixture or a pure substance and further into categories such as element, compound, homogeneous mixture, or heterogeneous mixture, consider the following:
- Orange juice is generally a heterogeneous mixture because it can contain pulp and other particles that are not uniformly distributed.
- Paper is a heterogeneous mixture as it can include a combination of cellulose, lignin, fillers, and other additives.
- Nitrogen, when pure, is an element since it is composed of only one type of atom.
- Blood is a heterogeneous mixture because it contains various types of cells, proteins, and other substances which are not uniformly distributed.
Considering this information, the correct classification would be: a) Mixture, b) Mixture, c) Substance (Element specifically), d) Mixture. Thus, the answer choice that correctly classifies each item is:
c) Mixture, Mixture, Substance, Mixture