Flashcards for NEET Chemistry - Some Basic Concepts of Chemistry

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Some Basic Concepts of Chemistry

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Some Basic Concepts of Chemistry

°F (degree Fahrenheit)

Fahrenheit scale is represented between 32° to 212°

°F = 9/5(°C) + 32

Mole

One mole is the amount of a substance that contains as many particles as there are atoms in12 g of ¹²C isotope,

i.e. ‘Avogadro constant’, or Avogadro number N_A = 6.022×10²³

Molar Mass

The mass of one mole of a substance in grams. The molar mass in grams is numerically equal to atomic/molecular/formula mass in u (unified mass).

Percentage Composition

Percentage of a particular element present in a compound.

Mass % of an element =

(Mass of that element in the compound/Molar mass of the compound) × 100

Mass Percent

Mass percent = (Mass of solute/Mass of solution) x 100

Molarity

Molarity (M) = No. of moles of solute/ Volume of solution in litres

Molality

Molality (m) = No. of moles of solute/ Mass of solvent in kg

Mole Fraction

Mole fraction of A = No. of moles of A/ No. of moles of solutions = n_A / (n_A + n_B)

Avogadro’s Law

Equal volumes of all gases at the same temperature and pressure should contain an equal number of molecules.

Mass and Weight

The mass of a substance is the amount of matter present in it.

Weight is the force exerted by gravity on an object.

Also Check:

• NEET Chemistry Syllabus
• NEET Chemistry Important Topics
• NEET Chemistry MCQs
• How to Score 160 Plus in NEET Chemistry