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  2. Chemical reaction - Wikipedia

    en.wikipedia.org/wiki/Chemical_reaction

    A chemical reaction is a process that leads to the chemical transformation of one set of chemical substances to another. [ 1] When chemical reactions occur, the atoms are rearranged and the reaction is accompanied by an energy change as new products are generated. Classically, chemical reactions encompass changes that only involve the positions ...

  3. Chemical equation - Wikipedia

    en.wikipedia.org/wiki/Chemical_equation

    A chemical equation is the symbolic representation of a chemical reaction in the form of symbols and chemical formulas.The reactant entities are given on the left-hand side and the product entities are on the right-hand side with a plus sign between the entities in both the reactants and the products, and an arrow that points towards the products to show the direction of the reaction. [1]

  4. Conjugate (acid-base theory) - Wikipedia

    en.wikipedia.org/wiki/Conjugate_(acid-base_theory)

    A conjugate acid, within the Brønsted–Lowry acid–base theory, is a chemical compound formed when an acid gives a proton ( H +) to a base —in other words, it is a base with a hydrogen ion added to it, as it loses a hydrogen ion in the reverse reaction. On the other hand, a conjugate base is what remains after an acid has donated a proton ...

  5. RELEASED SCIENCE ITEMS 8 - National Center for Education ...

    nces.ed.gov/timss/pdf/timss2011_g8_science.pdf

    The correct answer for multiple-choice items is simply a letter code. For example, in the item S032087 on page 3, the letter code C is the correct answer. The correct answers for write-in or open-ended items are explained in a scoring guide. For example, One function of the uterus (page 1), provides an example of a scoring guide, indicating

  6. ERIC - Education Resources Information Center

    files.eric.ed.gov/fulltext/ED300241.pdf

    ERIC - Education Resources Information Center

  7. postage) - ed

    files.eric.ed.gov/fulltext/ED130858.pdf

    6. Reactions. Given the name or formula of a hydrocarbon molecule and that of a halogen or hydrogen halide, identify the-product or products formed when a reaction occurs in eight out of ten given reactions. 7. Functional Groups. Given the name of a class of organic compounds and a list of seven general formulas, identify the formula

  8. Thermochemical equation - Wikipedia

    en.wikipedia.org/wiki/Thermochemical_equation

    A thermochemical equation is a balanced stoichiometric chemical equation that represents the energy changes from a system to its surroundings. One such equation involves the enthalpy change, which is denoted with ΔH. In variable form, a thermochemical equation would appear similar to the following: A + B → C. ΔH = (±) #.

  9. Chemistry - Wikipedia

    en.wikipedia.org/wiki/Chemistry

    Chemistry is the scientific study of the properties and behavior of matter. [1] It is a physical science within the natural sciences that studies the chemical elements that make up matter and compounds made of atoms, molecules and ions: their composition, structure, properties, behavior and the changes they undergo during reactions with other substances.

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