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  1. Hess's Law: Combining Reactions
    by Dr. Osama M. Khaled — published Aug 07, 2026 — last modified Aug 07, 2026 11:19 AM — filed under: Year 11, Year 12
    Reverse, scale, and add thermochemical equations to find the ΔH of an overall reaction
    Located in Chemistry / Energy and Chemistry
  2. Formation Reactions
    by Dr. Osama M. Khaled — published Aug 07, 2026 — last modified Aug 07, 2026 11:25 AM — filed under: Year 11, Year 12
    Identify and write formation reactions and use formation enthalpies to find a reaction's ΔH
    Located in Chemistry / Energy and Chemistry
  3. Energy and Chemistry: Chapter Review
    by Dr. Osama M. Khaled — published Aug 07, 2026 — last modified Aug 07, 2026 11:31 AM — filed under: Year 11, Year 12
    A mixed review spanning work, specific heat, thermochemical equations, Hess's law, and the graphite-to-diamond conversion
    Located in Chemistry / Energy and Chemistry
  4. Loci and Their Equations
    by Dr. Osama M. Khaled — published Aug 24, 2026 — last modified Aug 28, 2026 09:44 PM — filed under: Year 12, Year 11
    Covers the concept of a locus, the three-step method for finding the equation of a locus, and several worked loci based on distance conditions.
    Located in Mathematics / Calculus / From Geometry to Coordinate Geometry
  5. Angle of Inclination and Slope of a Line
    by Dr. Osama M. Khaled — published Aug 24, 2026 — last modified Aug 28, 2026 09:44 PM — filed under: Year 10, Year 11
    Covers the definition of the angle of inclination, the slope of a nonvertical line, and the relation tan(theta) = slope.
    Located in Mathematics / Calculus / From Geometry to Coordinate Geometry
  6. Under Pressure: Units and Causes
    by Dr. Osama M. Khaled — published Jul 14, 2026 — last modified Jul 14, 2026 08:01 AM — filed under: Year 9, Year 11, Year 12
    Define pressure, calculate it from force and area, and convert among pascals, atmospheres, torr, and mmHg
    Located in Chemistry / Gases
  7. Intervals of Real Numbers
    by Dr. Osama M. Khaled — published Aug 19, 2026 — last modified Aug 21, 2026 11:22 AM — filed under: Year 11
    Covers open, closed, and half-open intervals, bounded versus unbounded intervals, and their use in describing domains.
    Located in Mathematics / Calculus / Discovery of Real Numbers: Through Traditional Algebra
  8. Absolute Value Inequalities and Neighborhoods
    by Dr. Osama M. Khaled — published Aug 19, 2026 — last modified Aug 21, 2026 11:21 AM — filed under: Year 11, Year 12
    Covers solving absolute value inequalities and the concept of a neighborhood or deleted neighborhood of a point.
    Located in Mathematics / Calculus / Discovery of Real Numbers: Through Traditional Algebra
  9. Chloroplasts and Photosynthesis Organelles
    by Dr. Osama M. Khaled — published Jun 15, 2026 — last modified Jun 15, 2026 06:24 PM — filed under: Year 8, Year 11
    This quiz covers chloroplast structure (stroma, grana, lamellae, outer membrane), the role of plastids, and how chloroplasts compare to mitochondria in ...
    Located in Biology / Cell Structure
  10. Vacuoles and Cell Sap
    by Dr. Osama M. Khaled — published Jun 15, 2026 — last modified Jun 15, 2026 09:26 PM — filed under: Year 8, Year 11, Year 12
    Focuses on plant vacuoles (tonoplast, cell sap, hyperosmotic conditions), contractile vacuoles in single-celled organisms, and the role of vacuoles in storing ...
    Located in Biology / Cell Structure
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