NEET Chemistry Post-Mortem Session

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Questions and Answers

What is the molecular mass of N2?

40 gm

50 gm

28 gm (correct)

32 gm

What is the value of R in the given reaction?

10 x 10^4

10 x 10^5

10 x 10^2

10 x 10^3 (correct)

What is the product of the reaction CO2 + 24 → 202?

CHy (correct)

CH4

H2O

What is the value of n in the given equation?

10 x 10^2 Signup and view all the answers

What is the formula mass of WHzo?

2 x 18 Signup and view all the answers

What is the amount of MNHz formed in the reaction?

2 x 1666 Signup and view all the answers

What is the molecular mass of Tryo?

16 gm Signup and view all the answers

What is the value of the score in the given scorchiomety?

2 x 3 Signup and view all the answers

What is the formula mass of CO2?

44 gm Signup and view all the answers

What is the amount of ecleti formed in the reaction?

5 Aus Signup and view all the answers

What does the symbol '>' represent in the content?

Chemical reaction Signup and view all the answers

What is the charge of the Bez molecule?

+2 Signup and view all the answers

What is the difference between 'nunfanid' and 'infaiede'?

nunfanid is a reactant, while infaiede is a product Signup and view all the answers

What is the significance of the numbers '17e' and '15e-' in the content?

They represent the number of electrons gained or lost during the reaction Signup and view all the answers

What is the chemical formula for the product formed when N2 reacts with O2?

NO2 Signup and view all the answers

What is the significance of the phrase 'does not exist' in the content?

It indicates that the reactant is unstable Signup and view all the answers

What is the value of the change in internal energy (Du) for a reversible process?

0 Signup and view all the answers

What is the formula used to calculate the work done (Win) in a reversible process?

Win = -P * DV Signup and view all the answers

What is the value of the work done (Win) in the given example?

-8 L atm Signup and view all the answers

What is the formula used to calculate the work done (w) in an irreversible process?

w = -2.303 * nRT * log(V2/V1) Signup and view all the answers

What is the value of the work done (w) in the given example, using the provided values?

-8.314 J Signup and view all the answers

What is the relationship between enthalpy change (DH) and internal energy change (Du)?

DH = Du + P * DV Signup and view all the answers

What is the value of the change in enthalpy (DH) in the given example, using the provided values?

42.814 kJ/mol Signup and view all the answers

What is the formula used to calculate the change in internal energy (Du) for a process at constant volume?

Du = qv Signup and view all the answers

What is the equation represented for Ka in the content?

Ka = 3.2 x 10^Y Signup and view all the answers

What does the equation x 10 represent in the content?

A multiplication factor Signup and view all the answers

What is the value of C represented in the equations?

0.02 Signup and view all the answers

What is the relationship of Cry and Water in the content?

Cry is added to Water Signup and view all the answers

What is the formula for calculating DTb based on Ty and ty0?

DTb = Ty - ty0 Signup and view all the answers

How is the term Pr interpreted in the content?

A variable for logarithmic function Signup and view all the answers

What does 3-2log2 equal in the provided equations?

3-0.5 Signup and view all the answers

What value is assigned to Aly in the context provided?

0.88 Signup and view all the answers

What multiplicative factor is used to convert Ty to DTb?

90 Signup and view all the answers

What is the numerical base used in the provided logarithmic expressions?

2 Signup and view all the answers

Which operation is primarily shown in the expression 10-7?

Exponentiation Signup and view all the answers

In the expression Ty = 354 11k - 0.88, what operation is primarily being carried out?

Subtraction Signup and view all the answers

What is the significance of the expression '2057X 163' in relation to C?

It signifies a mass calculation Signup and view all the answers

What components are involved in the equation that includes DTb?

Ty and MM Signup and view all the answers

Study Notes

Chemical Calculations and Formulas

Essential calculations are performed using moles and mass, e.g., 2 moles of H₂O = 36 g.
Application of stoichiometry is crucial in balancing reactions and determining reactant/product relationships.
Converting moles to grams involves multiplication by molar mass, which is vital in quantitative chemistry.

Gases and Molar Volumes

The molar volume of gases is vital in calculations, often approximating to 22.4 L for ideal gases under STP conditions.
Issues of partial pressures can be addressed using Dalton's Law, which states that the total pressure is the sum of individual pressures in a mixture.

Thermodynamics and Energy

The relationship between enthalpy change (ΔH) and temperature can be modeled, with calculations involving the gas constant R.
Key equation: ΔU = nC_vΔT, where ΔU is the change in internal energy, n is the number of moles, C_v is the molar heat capacity at constant volume, and ΔT is the temperature change.

Equilibrium and Reaction Quotients

Equilibrium constants (K) are determined for reactions; they indicate the extent of a reaction at equilibrium.
Le Chatelier’s Principle describes how a system at equilibrium responds to stress (changes in concentration, temperature, or pressure).

Acid-Base Chemistry

Acid dissociation constant (Ka) indicates the strength of an acid in solution; it is crucial for understanding pH levels.
The relationship between pH and hydrogen ion concentration is given by the formula pH = -log[H⁺].

Concentrations and Dilutions

Dilution calculations utilize the equation C₁V₁ = C₂V₂, where C is concentration and V is volume.
Understanding molarity (moles per liter) is essential when preparing solutions for reactions.

Ionic Strength and Activity

Ionic strength affects the behavior of ions in solution and must be calculated to correctly interpret reaction environments.
Activity coefficients adjust for non-ideal behavior in concentrated solutions.

Reaction Mechanisms and Rates

Reaction rates can be adjusted by changing concentration or temperature, highlighting the importance of activation energy.
Understanding the mechanism involves breaking down steps of reaction to identify rate-determining steps.

Electrochemistry

Standard electrode potentials indicate the tendency of a species to be reduced or oxidized.
The Nernst equation is used to calculate cell potential under non-standard conditions: E = E° - (RT/nF)lnQ.

Key Units and Constants

Familiarity with key constants such as the universal gas constant (R = 8.314 J/(mol·K)) and Avogadro's number (6.022 × 10²³) is critical.
Unit conversions (e.g., atm to kPa) must be practiced for precision in calculations.

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