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Atomic Theory

by admin — published Sep 11, 2022 — last modified Jul 13, 2024 10:06 PM — filed under: Year 9

State the modern atomic theory and learn how atoms are constructed.

Located in Chemistry / Atoms, Molecules, and Ions

Names and Symbols of Common Elements

by Dr. Osama M. Khaled — published Sep 18, 2022 — last modified Jul 13, 2024 10:06 PM — filed under: Year 9

Test your knowledge and memory identifying symbols of comment elements

Located in Chemistry / Atoms, Molecules, and Ions

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

Calculate commissions and commission rates

by Dr. Osama M. Khaled — published Dec 13, 2024 — last modified May 12, 2025 06:14 AM — filed under: Year 7, Year 8, Year 9

Instead of working for a salary or getting paid at an hourly rate,many salespeople are paid on commission.They earn a certain percent of the total dollar ...

Located in Mathematics / … / Percent / Applications of Percent

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

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

History of Algebra

by Dr. Osama M. Khaled — published Jun 04, 2022 — last modified Jul 23, 2025 03:32 AM — filed under: Year 9

Algebra is one of the major branches of mathematics which was established by Muslim Arabs.

Located in Mathematics / Algebra / Basics

Simplify products

by Dr. Osama M. Khaled — published May 25, 2023 — last modified Jul 12, 2024 10:24 PM — filed under: Year 9

The commutative and associative properties of multiplication can be used to simplify certain products

Located in Mathematics / Algebra / Simplifying Algebraic Expressions

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

Identify bases and exponents

by Dr. Osama M. Khaled — published Dec 16, 2023 — last modified Jul 12, 2024 10:19 PM — filed under: Year 9

An exponent indicates repeated multiplication as a shortcut method of how many times the base is used as a factor.

Located in Mathematics / Algebra / Multiplication Rules for Exponents

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