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- Basic Math and Science Chemical Reactions and Stoichiometry Questions and Answers Flashcards

6 cards from real BMST 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. In a balanced chemical equation, what is conserved?

    Answer: Mass and the number of atoms of each element

    The law of conservation of mass requires that atoms are neither created nor destroyed in a chemical reaction.

  2. What is the molar mass of water (H₂O)?

    Answer: 18 g/mol

    H₂O = 2(1.008) + 16.00 = approximately 18 g/mol.

  3. What type of reaction is: 2H₂ + O₂ → 2H₂O?

    Answer: Synthesis (combination)

    Two or more reactants combine to form a single product, which defines a synthesis reaction.

  4. How many moles are in 44 grams of CO₂?

    Answer: 1 mole

    Molar mass of CO₂ = 12 + 2(16) = 44 g/mol. So 44g ÷ 44g/mol = 1 mole.

  5. What is a catalyst?

    Answer: A substance that speeds up a reaction without being consumed

    Catalysts lower the activation energy of a reaction, increasing its rate without being permanently changed.

  6. In the reaction Fe + CuSO₄ → FeSO₄ + Cu, what type of reaction is this?

    Answer: Single replacement

    Iron replaces copper in the compound because iron is more reactive than copper.