Mnemonics: Some Basic Concepts Of Chemistry | Chemistry Class 11 - NEET PDF Download

Mole Concept

Mnemonic:
"Moles Count, Particles Mount—Avogadro’s Constant is the Amount!"
Explanation:

• Moles Count = A mole represents $6.022\times 10\mathrm{<sup\; style="font-size:\; 12px\; !important">23</sup>}6.022\; \backslash times\; 10^\{23\}$ entities (Avogadro's number).

• Particles Mount = Moles help relate the number of particles (atoms, molecules) to the macroscopic amount of substance.

• Avogadro’s Constant is the Amount = The number of particles in one mole is Avogadro's constant.

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Empirical and Molecular Formulas

Mnemonic:
"Empirical’s Simple, Molecular’s True—Find the Ratio for You!"
Explanation:

• Empirical’s Simple = The empirical formula represents the simplest whole-number ratio of atoms in a compound.

• Molecular’s True = The molecular formula represents the actual number of atoms of each element in a molecule.

Avogadro’s Hypothesis

Mnemonic: "Equal Volumes, Equal Moles—Under the Same Conditions, You Know!"
Explanation:

• Equal Volumes = Avogadro’s hypothesis states that equal volumes of gases, at the same temperature and pressure, contain the same number of molecules.

• Equal Moles = The number of moles of gas molecules is directly proportional to the volume of the gas at constant temperature and pressure.

Laws of Chemical Combination

Types: Law of Conservation of Mass, Law of Definite Proportions, Law of Multiple Proportions

Mnemonic: "Carmen Defends Mighty Peaks"

Breakdown:

• Carmen - Law of Conservation of Mass
• Defends - Law of Definite Proportions
• Mighty Peaks - Law of Multiple Proportions

Concept of Limiting Reagent

Mnemonic:
"Limiting’s the Key, Reaction’s Bound—Other Reactants Go Around!"
Explanation:

• Limiting’s the Key = The limiting reagent is the reactant that is completely consumed first and limits the amount of product formed.

• Reaction’s Bound = The amount of product is determined by the limiting reagent.