The 2 categories are 'pure substances' or 'mixtures'
matter, elements, andmixture
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Two categories used to classify properties of matter are physical properties and chemical properties. Physical properties can be observed or measured without changing the composition of the substance, while chemical properties describe how a substance changes into a new substance through a chemical reaction.
Two categories that fall under a substance are elements and compounds. Elements are made up of only one type of atom, while compounds are made up of two or more different types of atoms chemically bonded together.
I don't know what are the 2 MAJOR categories but, here's some categories: Comedy, tradegy, poems, romance, historic, masque, roman, problem, tragicomedy. Hope this answer helps you. :)
The equation you will need is: Mol of substance 1 * volume of substance 1 = Mol of substance 2 * volume of substance 2
A substance can be categorized into several categories. If a substance cannot be separated through physical means (e.g., distillation, magnetism) it is a pure substance. If a substance can be separated through physical means, it is a mixture. If a mixture is uniform throughout, it is a homogenous mixture, like saltwater. If it is not (i.e., there are different parts to it, like a can of soda), it is a heterogeneous mixture. If a pure substance can be separated through chemical means, it is a compound, like glucose, which is made of carbon, oxygen, and hydrogen. If a substance cannot be separated by chemical means, it is an element, like oxygen, which is made of just oxygen. A substance can be in multiple categories.
Vertebrates and invertebrates.
Cryptogams and Fanerogams
there are three categories of control structure 1 sequential 2 selective 3 repetitive
The categories of dialectics are 1.motion materialism 2.unity of opposites 3.contradictions(negation of the negation)
It is not possible to answer as there are many more than 2 categories.