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  1. Dissociation, Ionic Equations, and Spectator Ions
    by Dr. Osama M. Khaled — published Nov 09, 2025 — last modified Nov 18, 2025 07:39 AM — filed under: Year 9
    One important aspect about ionic compounds that differs from molecular compounds has to do with dissolving in a liquid, such as water
    Located in Chemistry / Chemical Reactions
  2. Distributive Property
    by Dr. Osama M. Khaled — published May 28, 2023 — last modified Jul 12, 2024 10:06 PM — filed under: Year 8, Year 9
    Distributive property is often used to simplify algebraic expressions.
    Located in Mathematics / Algebra / Simplifying Algebraic Expressions
  3. Earth Satellites
    by Dr. Osama M. Khaled — published Mar 30, 2024 — last modified Jul 13, 2024 12:49 PM — filed under: Year 9
    Newton argued that if a cannon could be placed on a hill high enough to be outside the earth's atmosphere, and if the cannon could be made powerful enough, a ...
    Located in Physics / Gravity
  4. Elements and Compounds
    by Dr. Osama M. Khaled — published May 30, 2024 — last modified Jul 13, 2024 12:55 PM — filed under: Year 9
    All of the materials and substances that we experience are made up of elements
    Located in Physics / Atoms and Molecules
  5. Estimate Answers to percent problems involving 200%
    by Dr. Osama M. Khaled — published May 12, 2025 — last modified May 12, 2025 06:40 AM — filed under: Year 7, Year 8, Year 9
    Since 100% of a number is the number itself, it follows that 200% of a number would be twice the number.
    Located in Mathematics / … / Percent / Estimation with Percent
  6. Find powers of products
    by Dr. Osama M. Khaled — published Jan 18, 2024 — last modified Jul 12, 2024 10:20 PM — filed under: Year 9
    To raise a product to a power, raise each factor of the product to that power
    Located in Mathematics / Algebra / Multiplication Rules for Exponents
  7. Find the percent of increase or decrease
    by Dr. Osama M. Khaled — published Dec 24, 2024 — last modified May 12, 2025 06:16 AM — filed under: Year 7, Year 8, Year 9
    Percents can be used to describe how a quantity has changed
    Located in Mathematics / … / Percent / Applications of Percent
  8. Geometry Basics
    by Dr. Osama M. Khaled — published Oct 18, 2020 — last modified Jul 13, 2024 10:52 PM — filed under: Year 9
    Test your basic knowledge about geometry. We all need some refreshment every now and then. You think you remember everything about geometry. You may be ...
    Located in Mathematics / Geometry / Fundamentals
  9. Geometry Definitions
    by Dr. Osama M. Khaled — published May 22, 2022 — last modified Jul 13, 2024 10:46 PM — filed under: Year 9
    Some essential definitions in geometry
    Located in Mathematics / Geometry / Fundamentals
  10. Graphs for categorical variables
    by Dr. Osama M. Khaled — published Aug 11, 2022 — last modified Jul 13, 2024 10:12 PM — filed under: Year 9
    The values of a categorical variable are labels for the categories, such as “female” and “male"
    Located in Mathematics / Statistics / Data Distributions
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