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Chemistry: Chemical Reactions & Stoichiometry Flashcards

7 cards from real AP 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. Which reaction represents a single-replacement reaction?

    Answer: Zn + 2HCl -> ZnCl2 + H2

    Zinc displaces hydrogen from HCl, a classic single-replacement pattern.

  2. How many molecules are in 36.0 g of water (molar mass 18.0 g/mol)?

    Answer: 1.20 x 10^24

    36.0 g is 2.00 mol, equal to 1.20 x 10^24 molecules.

  3. For 2KClO3 -> 2KCl + 3O2, how many grams of O2 form from 245 g KClO3 (molar mass 122.5 g/mol)?

    Answer: 96.0 g

    245 g is 2.00 mol KClO3, producing 3.00 mol O2 = 96.0 g.

  4. Which pair of compounds will form a precipitate when mixed in solution?

    Answer: Pb(NO3)2 + KI

    Pb(NO3)2 and KI form insoluble PbI2, a yellow precipitate.

  5. What is the molarity of a solution containing 0.50 mol of solute in 250 mL of solution?

    Answer: 2.0 M

    Molarity = 0.50 mol / 0.250 L = 2.0 M.

  6. Which statement reflects the law of conservation of mass in a balanced equation?

    Answer: Atoms of each element are equal on both sides

    Balancing ensures the same number of each atom appears on both sides, conserving mass.

  7. How many moles of ions are released when 1 mol of Al2(SO4)3 fully dissolves?

    Answer: 5 mol

    It dissociates into 2 Al^3+ and 3 SO4^2-, totaling 5 mol of ions.