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In June 2015, the exam was changed to AP World History: Modern. [1] The new exam only includes material from 1250 C.E. onwards. Students first took the new course in the 2019–20 school year. The College Board announced the development of AP World History: Ancient, which focuses exclusively on earlier periods, including prehistory. [2]
The AP exam for European History is divided into two sections, comprising 55 multiple-choice questions (with four answer choices), three short-answer questions, and two essay responses (one thematic Long Essay Question (LEQ) and one Document Based Question (DBQ)). [3]
The documents contained in the document-based questions are rarely familiar texts (for example, the Emancipation Proclamation and Declaration of Independence are not likely to be on a U.S. history test), though the documents' authors may be major historical figures. The documents vary in length and format.
The following outline acts as an overview of and topical guide to chemistry: . Chemistry is the science of atomic matter (matter that is composed of chemical elements), especially its chemical reactions, but also including its properties, structure, composition, behavior, and changes as they relate to the chemical reactions.
4) and carbonate (CO 2− 3) ions in ammonium carbonate. Individual ions within an ionic compound usually have multiple nearest neighbours, so are not considered to be part of molecules, but instead part of a continuous three-dimensional network, usually in a crystalline structure.
CH 3 CH 3 → 2 CH 3 ⋅. Because C−C bond energy is so high (377 kJ/mol), [18] this reaction is not observed under laboratory conditions. More common examples of cracking reactions involve retro-Diels–Alder reactions. Illustrative is the thermal cracking of dicyclopentadiene to produce cyclopentadiene.
The first two questions are required, but students choose between the third and fourth questions. Students are given a total of 95 minutes (55 for the multiple-choice section and 40 for three short-answer questions) to complete Section I.
Nuclear chemistry is the sub-field of chemistry dealing with radioactivity, nuclear processes, and transformations in the nuclei of atoms, such as nuclear transmutation and nuclear properties. It is the chemistry of radioactive elements such as the actinides , radium and radon together with the chemistry associated with equipment (such as ...