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No doubt that the National Examination SMA / MA chemistry is quite a difficult lesson. This is possible because the chemical is considered as the science center. Chemistry is often referred to as the “central science” because it connects many other sciences, like physics, materials science, nanotechnology, biology, pharmacy, medicine, bioinformatics, and geology. This connection arises through the various sub-disciplines that utilize concepts from different disciplines. For example, physical chemistry involves the application of physics principles to the matter at the atomic and molecular level.

Associated with the interaction of chemical materials that can involve two substances or between matter and energy, especially in relation to the first law of thermodynamics. Traditional chemistry involves interactions between substances in chemical reactions, which alter one or more substances into one or more other substances. Sometimes the reaction is driven by enthalpy considerations, such as when two high berentalpi substances such as elemental hydrogen and oxygen react to form water, a substance with a lower enthalpy. Chemical reactions can be facilitated by a catalyst, which generally are other chemicals involved in the reaction medium but not consumed (such as sulfuric acid, which catalyze the electrolysis of water) or immaterial phenomena (such as electromagnetic radiation in the photochemical reaction). Traditional chemical analysis is also dealing with chemicals, both inside and outside of a reaction, such as in spectroscopy.

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Chemistry is the scientific study of interaction of chemical substances that are constituted of atoms or the subatomic particles: protons, electrons and neutrons. Atoms combine to produce molecules or crystals. Chemistry is often called “the central science” because it connects the other natural sciences such as astronomy, physics, material science, biology, and geology.

The genesis of chemistry can be traced to certain practices, known as alchemy, which had been practiced for several millennia in various parts of the world, particularly the Middle East.

The structure of objects we commonly use and the properties of the matter we commonly interact with, are a consequence of the properties of chemical substances and their interactions. For example, steel is harder than iron because its atoms are bound together in a more rigid crystalline lattice; wood burns or undergoes rapid oxidation because it can react spontaneously with oxygen in a chemical reaction above a certain temperature; sugar and salt dissolve in water because their molecular/ionic properties are such that dissolution is preferred under the ambient conditions.

The transformations that are studied in chemistry are a result of interaction either between different chemical substances or between matter and energy. Traditional chemistry involves study of interactions between substances in a chemistry laboratory using various forms of laboratory glassware.