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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. What mass of CO2 forms when 1.00 mol of glucose (C6H12O6) is fully combusted?

    Answer: 264 g

    Each glucose yields 6 CO2 (6 mol x 44.0 g = 264 g).

  2. Which is an example of a synthesis (combination) reaction?

    Answer: 2Mg + O2 -> 2MgO

    Two reactants combine to form a single product, MgO.

  3. A 50.0 g sample of CaCO3 (molar mass 100.1 g/mol) decomposes. How many moles of CO2 are released?

    Answer: 0.500 mol

    CaCO3 -> CaO + CO2 gives 0.500 mol CaCO3 producing 0.500 mol CO2.

  4. What is the concentration in molarity if 11.7 g of NaCl (58.44 g/mol) is dissolved to make 0.500 L of solution?

    Answer: 0.400 M

    11.7 g is 0.200 mol; 0.200 mol / 0.500 L = 0.400 M.

  5. In the reaction 2Na + 2H2O -> 2NaOH + H2, which species is oxidized?

    Answer: Sodium

    Sodium goes from 0 to +1, losing electrons, so it is oxidized.

  6. If 4.00 g of H2 reacts with excess O2, what is the maximum mass of water produced?

    Answer: 36.0 g

    4.00 g H2 is 2.00 mol; 2H2 + O2 -> 2H2O gives 2.00 mol water = 36.0 g.

  7. Which best describes the theoretical yield of a reaction?

    Answer: The maximum product predicted from stoichiometry

    Theoretical yield is the maximum product calculated assuming complete reaction of the limiting reactant.