Chemistry Flashcards
6 cards from real EIT practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 6 Chemistry flashcards as text
What is the standard enthalpy of formation of a pure element in its most stable form?
Answer: 0 kJ/mol
By thermodynamic convention, the standard enthalpy of formation of elements in their standard state is zero.
A reaction is spontaneous under constant temperature and pressure when:
Answer: ΔG < 0
A negative Gibbs free energy change (ΔG < 0) indicates the reaction proceeds spontaneously.
What is the equivalent weight of H₂SO₄ (MW = 98 g/mol)?
Answer: 49 g/eq
H₂SO₄ donates 2 protons per molecule, so equivalent weight = 98/2 = 49 g/eq.
The Clausius-Clapeyron equation relates which two variables for a phase transition?
Answer: Vapor pressure and temperature
The Clausius-Clapeyron equation describes how the vapor pressure of a substance changes with temperature along a phase boundary.
In electrochemistry, what does Faraday's constant (≈ 96,485 C/mol) represent?
Answer: Charge carried per mole of electrons
Faraday's constant is the total electric charge carried by one mole of electrons (≈ 96,485 C/mol).
Which colligative property describes the increase in boiling point when a nonvolatile solute is added to a solvent?
Answer: Boiling point elevation
Boiling point elevation occurs because solute particles lower the vapor pressure, requiring a higher temperature to boil.