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Course information comes from the public UCLA General Catalog. Requisites are read from UCLA’s published wording and can be incomplete or out of date — check the official catalog listing and your department adviser before you enroll.

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CHEM 20BHChemical Energetics and Change (Honors)

Chemistry and Biochemistry · 4 units · Undergraduate lower division (0-99)

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Honors course parallel to course 20B.

Letter grading.

When it runs

  • Winter 2026
  • Winter 2027

Scheduled, not typical — from UCLA’s Schedule of Classes, which publishes Fall 2025 through Spring 2027 and nothing before it.

Requisites

Official UCLA wording

Enforced requisites: course 20A and Mathematics 31A with grades of B+ or better or 20AH with grade of B or better. Enforced corequisite: Mathematics 31B.

BruinTree reads · Prerequisite

needs reviewconfidence 0.90 · from text
one of
  • all of
    • CHEM 20A
    • MATH 31Agrade B+ or better
  • MATH 20AHgrade B or better
  • · "MATH 20AH" is not in this catalog version

BruinTree reads · Corequisite

confidence 1.00 · from text
MATH 31B

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About CHEM 20BH. We read UCLA’s requisite wording by machine, and it gets things wrong.

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Requires

Everything that has to come before this course, not just the courses named in the requisite above.

CHEM 20BH

  • CHEM 20AChemical Structure
    • MATH 31ADifferential and Integral Calculusanother path to it
  • MATH 31ADifferential and Integral Calculus
    • MATH 1Precalculus
  • MATH 31BIntegration and Infinite Series
    • MATH 31ADifferential and Integral Calculusanother path to it

3 direct requisites. The whole upstream is here — 6 courses over 2 levels. Every course here opens its own tree.

Unlocks

What this course is a requisite for, and what those courses lead to in turn.

CHEM 20BH

  • CHEM 14CLGeneral and Organic Chemistry Laboratory II
    • CHEM 192AUndergraduate Practicum in Chemistry and Biochemistry
    • CHEM 192BUndergraduate Practicum in Chemistry and Biochemistry
  • CHEM 30ALGeneral Chemistry Laboratory II2 more beyond
    • CHEM 30BLOrganic Chemistry Laboratory I
      • CHEM 30CLOrganic Chemistry Laboratory II6 more beyond
      • CHEM 103Environmental Chemistryanother path to it
      • EE BIOL 170Animal Environmental Physiology
    • CHEM 114Physical Chemistry Laboratory
    • EE BIOL 148Biology of Marine Plants
    • CHEM 114HPhysical Chemistry Laboratory (Honors)
    • CHEM 153LBiochemical Methods I
      • CHEM 103Environmental Chemistryanother path to it
      • CHEM C150Research Integrity and Methods in Cellular Biology, Molecular Biology, and Biochemistry Research
      • MCD BIO M170Biochemistry and Molecular Biology of Photosynthetic Apparatus
      • CHEM 154Biochemical Methods II
      • CHEM CM170Biochemistry and Molecular Biology of Photosynthetic Apparatus
      • CHEM C270Biochemistry and Molecular Biology of Photosynthetic Apparatus
    • ENV HLT 401Environmental Measurements
      • ENV HLT 461Water Quality and Health
    • CHEM C185Materials Chemistry Laboratory
    • CHEM 192AUndergraduate Practicum in Chemistry and Biochemistryanother path to it
  • CHEM 110APhysical Chemistry: Chemical Thermodynamics17 more beyond
    • CHEM 103Environmental Chemistry
    • CHEM 110BTopics in Physical Chemistry4 more beyond
      • CHEM 114Physical Chemistry Laboratoryanother path to it
      • CHEM 114HPhysical Chemistry Laboratory (Honors)another path to it
      • CHEM C115AAdvanced Quantum Chemistry with Laboratory I1 more beyond
      • CHEM 118Colloidal Dynamics Laboratoryanother path to it
      • CHEM 121Special Topics in Physical Chemistry
      • CHEM C143AStructure and Mechanism in Organic Chemistry1 more beyond
      • CHEM C175Inorganic Reaction Mechanisms
      • CHEM C215AAdvanced Quantum Chemistry with Laboratory I1 more beyond
    • MAT SCI 131Diffusion and Diffusion-Controlled Reactions
      • MAT SCI 131LDiffusion and Diffusion-Controlled Reactions Laboratory
      • MAT SCI 132Structure and Properties of Metallic Alloys2 more beyond
      • MAT SCI 201Principles of Materials Science II
      • MAT SCI 222Growth and Processing of Electronic Materials
      • MAT SCI 223Materials Science of Thin Films
      • MAT SCI 226Si-CMOS Technology: Selected Topics in Materials Science
    • CHEM 114Physical Chemistry Laboratoryanother path to it
    • CHEM 114HPhysical Chemistry Laboratory (Honors)another path to it
    • PHYSICS 144Polymer Physics
    • CHEM 118Colloidal Dynamics Laboratory
    • CHEM C123AAdvanced Thermodynamics and Statistical Mechanics with Laboratory I
      • CHEM C123BAdvanced Thermodynamics and Statistical Mechanics with Laboratory II
  • CHEM 151Machine Learning for Chemistry

4 courses list this as a requisite. Showing 47 courses over 3 levels; the branches marked with a count carry on past it. Every course here opens its own tree.