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General Chemistry Principles 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.

Read the first 7 General Chemistry Principles flashcards as text

  1. Which of the following has the highest lattice energy?

    Answer: MgO

    Lattice energy increases with higher ionic charges and smaller ionic radii; MgO (Mg²⁺ and O²⁻) has the highest charge product and small ions.

  2. At STP, what volume does 2 moles of an ideal gas occupy?

    Answer: 44.8 L

    One mole of ideal gas occupies 22.4 L at STP, so 2 moles occupy 2 × 22.4 = 44.8 L.

  3. Which of the following best describes an endothermic reaction?

    Answer: ΔH is positive

    An endothermic reaction absorbs heat from the surroundings, so the enthalpy change (ΔH) is positive.

  4. According to VSEPR theory, the molecular geometry of SF4 is:

    Answer: See-saw

    SF4 has 4 bonding pairs and 1 lone pair (5 electron groups), giving a see-saw molecular geometry.

  5. The half-life of a first-order reaction is 10 minutes. How much of a 100 g sample remains after 30 minutes?

    Answer: 12.5 g

    Three half-lives elapse in 30 min; 100 → 50 → 25 → 12.5 g, so 12.5 g remains.

  6. Which of the following is an example of a Lewis acid?

    Answer: BF3

    BF3 is an electron-pair acceptor (Lewis acid) because boron has an empty p orbital and an incomplete octet.

  7. Hess's Law states that the total enthalpy change for a reaction:

    Answer: Is independent of the pathway taken

    Hess's Law states that ΔH is a state function and is the same regardless of how many steps are used to go from reactants to products.