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General Chemistry Flashcards

7 cards from real OAT practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

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  1. The Henderson-Hasselbalch equation is used to calculate:

    Answer: pH of a buffer solution

    The Henderson-Hasselbalch equation (pH = pKa + log([A⁻]/[HA])) calculates the pH of buffer solutions.

  2. Which of the following represents an endothermic process?

    Answer: Dissolution of ammonium nitrate in water

    Dissolution of NH4NO3 in water absorbs heat (feels cold), making it an endothermic process.

  3. What is the molarity of a solution made by dissolving 4.0 g of NaOH (MW = 40 g/mol) in enough water to make 500 mL of solution?

    Answer: 0.2 M

    Moles of NaOH = 4.0/40 = 0.1 mol; Molarity = 0.1 mol / 0.5 L = 0.2 M.

  4. Which of the following is a Lewis acid?

    Answer: BF3

    BF3 is a Lewis acid because it is an electron pair acceptor (boron has an empty p orbital).

  5. In an electrochemical cell, oxidation occurs at the:

    Answer: Anode

    Oxidation (loss of electrons) always occurs at the anode in any electrochemical cell.

  6. Which gas law states that the pressure of a gas is directly proportional to its absolute temperature at constant volume?

    Answer: Gay-Lussac's Law

    Gay-Lussac's Law states P ∝ T (at constant volume and moles of gas).

  7. The rate law for a reaction is rate = k[A]²[B]. If [A] is doubled while [B] is held constant, the rate will:

    Answer: Quadruple

    Since the reaction is second order in A, doubling [A] increases the rate by 2² = 4 (quadruples).