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  2. General chemistry - Wikipedia

    en.wikipedia.org/wiki/General_chemistry

    General chemistry (sometimes referred to as "gen chem") is offered by colleges and universities as an introductory level chemistry course usually taken by students during their first year. [1] The course is usually run with a concurrent lab section that gives students an opportunity to experience a laboratory environment and carry out ...

  3. IB Group 4 subjects - Wikipedia

    en.wikipedia.org/wiki/IB_Group_4_subjects

    Structure 2.1 - The ionic model SL/HL Structure 2.2 - The covalent model SL/HL Structure 2.3 - The metallic model SL/HL Structure 2.4 - From models to materials SL/HL Structure 3. Classification of matter: Structure 3.1 - The periodic table: Classification of elements SL/HL Structure 3.2 - Functional groups: Classification of organic compounds ...

  4. Atoms in molecules - Wikipedia

    en.wikipedia.org/wiki/Atoms_in_molecules

    In quantum chemistry, the quantum theory of atoms in molecules (QTAIM), sometimes referred to as atoms in molecules (AIM), is a model of molecular and condensed matter electronic systems (such as crystals) in which the principal objects of molecular structure - atoms and bonds - are natural expressions of a system's observable electron density distribution function.

  5. Collision theory - Wikipedia

    en.wikipedia.org/wiki/Collision_theory

    General What links here ... Collision theory is a principle of chemistry used to predict the ... the number of density of B is 0.2×6.02×10 23 ÷10 −3 = 1.2×10 ...

  6. GCSE Science - Wikipedia

    en.wikipedia.org/wiki/GCSE_Science

    In August 2018, Ofqual announced that it had intervened to adjust the GCSE Science grade boundaries for students who had taken the "higher tier" paper in its new double award science exams and performed poorly, due to an excessive number of students in danger of receiving a grade of "U" or "unclassified".

  7. Nitro compound - Wikipedia

    en.wikipedia.org/wiki/Nitro_compound

    In the so-called Ter Meer reaction (1876) named after Edmund ter Meer, [14] the reactant is a 1,1-halonitroalkane: The reaction mechanism is proposed in which in the first slow step a proton is abstracted from nitroalkane 1 to a carbanion 2 followed by protonation to an aci-nitro 3 and finally nucleophilic displacement of chlorine based on an ...

  8. Substitution reaction - Wikipedia

    en.wikipedia.org/wiki/Substitution_reaction

    The two reactions are named according tho their rate law, with S N 1 having a first-order rate law, and S N 2 having a second-order. [2] S N 1 reaction mechanism occurring through two steps. The S N 1 mechanism has two steps. In the first step, the leaving group departs, forming a carbocation (C +). In the second step, the nucleophilic reagent ...

  9. Peter Atkins - Wikipedia

    en.wikipedia.org/wiki/Peter_Atkins

    Peter William Atkins FRSC (born 10 August 1940) is an English chemist and a Fellow of Lincoln College at the University of Oxford.He retired in 2007. He is a prolific writer of popular chemistry textbooks, including Physical Chemistry, Inorganic Chemistry, and Molecular Quantum Mechanics.