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Endothermic and Exothermic Changes| Energy Changes| Introduction [Online Video]

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Basics Energy cannot be created or destroyed. However, it can be changed from one form…

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  • Chemistry Resources Online

How to convert units of mass and volume| Unit conversion [Online Video]

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Syllabus Objectives At O levels, students must be able to perform calculations involving the number…

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  • Chemistry Resources Online

How to calculate number of particles| Avogadro’s constant| Mole & Chemical Calculation [Online Video]

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Question Which substance contains the greatest number of atoms in 1 g?iodine (I2); iron (Fe)…

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  • Chemical Bonding

How to draw dot and cross diagram of Covalent Molecules| Step-by-step Explanation [Online Video]

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At O levels, students must be able to describe, using dot-and-cross diagrams, the formation of…

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  • Chemistry Resources Online

How to Solve Chemical Calculation involving Acid and Alkali| Step-by-Step Explanation| 2018/P1/Q11 [Online Video]

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Question Sodium hydroxide reacts with sulfuric acid. The equation for the reaction is shown.2NaOH +…

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  • Balancing Equations

Balancing of Chemical Equations – 2012/P1/Q12 [Online Video]

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When heated, two moles of X give one mole of oxygen and two moles of…

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  • Chemistry Resources Online

How to determine Empirical Formula of Compound| Mole & Chemical Calculation| 2015/P1/Q15 & 2008/P1/13 [Online Video]

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The formula of an oxide of element Y is Y2O3. 8.0 g of Y2O3 contains…

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  • Atomic Structure

What is the number of proton electron and neutron in an atom| Atomic Structure| 2016/P1/Q4 [Online Video]

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The table in the question shows details of the particles present in an atom of…

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  • Acid and Base

How does Salt solubility affect reaction- Acids, Bases, Salts – 2014/P1/Q29 [Online Video]

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Question Acid rain contains sulfuric acid and can cause lakes to become acidic. Acidic lakes…

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  • Chemical Bonding

How to determine structure of covalent molecule| Chemical Bonding| 2012/P1/Q9 [Online Video]

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Question Which row shows the correct structures of the covalent molecules C2H2; hydrazine, N2H4; nitrogen,…

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Top Posts & Pages

  • Qualitative Analysis - Identification of Cations using aqueous Sodium Hydroxide
    Qualitative Analysis - Identification of Cations using aqueous Sodium Hydroxide
  • Chemical Properties of Alkalis
    Chemical Properties of Alkalis
  • Qualitative Analysis - Identification of Anions
    Qualitative Analysis - Identification of Anions
  • Qualitative Analysis - Identifying cations [Online Video]
    Qualitative Analysis - Identifying cations [Online Video]
  • Flue Gas Desulfurisation
    Flue Gas Desulfurisation
  • Bases and Alkalis
    Bases and Alkalis
  • Chemical Properties of Acids
    Chemical Properties of Acids
  • How to calculate number of particles| Avogadro’s constant| Mole & Chemical Calculation [Online Video]
    How to calculate number of particles| Avogadro’s constant| Mole & Chemical Calculation [Online Video]
  • Qualitative Analysis – Identification of Cations using aqueous Ammonia [Online Video]
    Qualitative Analysis – Identification of Cations using aqueous Ammonia [Online Video]
  • Common Laboratory Apparatus and their functions
    Common Laboratory Apparatus and their functions

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