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Stoichiometric Relationships

Each subtopic includes About section, revision page link, 10 preview questions, and practice CTAs.

Introduction to the particulate nature of matter and chemical change

Subtopic

Introduction to the particulate nature of matter and chemical change under Stoichiometric Relationships for Grade 12 IB.

About Topic & Revision

Preview questions (no answers)

  1. 1.

    What happens to the speed of particles in a liquid as it is cooled toward its freezing point?

    A.

    The speed increases

    B.

    The speed decreases

    C.

    The speed stays the same

    D.

    The particles stop moving entirely

  2. 2.

    When balancing the equation P4+O2→P4O10P_4 + O_2 \rightarrow P_4O_{10}, what coefficient is needed for O2O_2?

    A.

    2

    B.

    4

    C.

    5

    D.

    10

  3. 3.

    Which of the following is an example of a heterogeneous mixture?

    A.

    Vinegar

    B.

    Stainless steel

    C.

    Salad dressing (oil and vinegar)

    D.

    Sugar dissolved in water

Download the worksheet for Stoichiometric Relationships - Introduction to the particulate nature of matter and chemical change to practice offline. It includes additional chapter-level practice questions.

The mole concept

Subtopic

The mole concept under Stoichiometric Relationships for Grade 12 IB.

About Topic & Revision

Preview questions (no answers)

  1. 1.

    Which unit is used for relative atomic mass (ArA_r)?

    A.

    g mol−1g\text{ mol}^{-1}

    B.

    gg

    C.

    molmol

    D.

    None (it is dimensionless)

  2. 2.

    How many moles of phosphorus atoms are in 0.25 mol0.25\text{ mol} of P4P_4 molecules?

    A.

    0.25 mol0.25\text{ mol}

    B.

    0.50 mol0.50\text{ mol}

    C.

    1.00 mol1.00\text{ mol}

    D.

    4.00 mol4.00\text{ mol}

  3. 3.

    What is the empirical formula of ethane (C2H6C_2H_6)?

    A.

    CHCH

    B.

    CH2CH_2

    C.

    CH3CH_3

    D.

    C2H6C_2H_6

Download the worksheet for Stoichiometric Relationships - The mole concept to practice offline. It includes additional chapter-level practice questions.

Reacting masses and volumes

Subtopic

Reacting masses and volumes under Stoichiometric Relationships for Grade 12 IB.

About Topic & Revision

Preview questions (no answers)

  1. 1.

    What is the mass of 2.002.00 mol of HeHe atoms? (Relative atomic mass: He=4.00He = 4.00)

    A.

    2.00 g

    B.

    4.00 g

    C.

    8.00 g

    D.

    1.00 g

  2. 2.

    What is the number of moles in 0.320.32 g of CH4CH_{4}? (Molar mass of CH4=16.04CH_{4} = 16.04)

    A.

    0.02 mol

    B.

    0.20 mol

    C.

    0.05 mol

    D.

    0.50 mol

  3. 3.

    Which of the following describes the percentage yield?

    A.

    (Actual / Theoretical) x 100

    B.

    (Theoretical / Actual) x 100

    C.

    (Mass of Product / Mass of Reactant) x 100

    D.

    (Moles of Solute / Volume of Solvent) x 100

Download the worksheet for Stoichiometric Relationships - Reacting masses and volumes to practice offline. It includes additional chapter-level practice questions.