Chemistry Clarity · chemistryclarity.com

SI Units and Unit Conversions: Flashcards

Revise the SI base units, metric prefixes and converting units with conversion factors.

10 cardsBeginner

10 cards

  1. Question
    What is the SI base unit of mass?
    Answer

    The kilogram, kg.

  2. Question
    Name the SI base units for length, time, temperature and amount of substance.
    Answer

    metre (m), second (s), kelvin (K), mole (mol)

  3. Question
    What does the prefix milli (m) mean?
    Answer

    10−310^{-3}: 1 mL = 0.001 L

  4. Question
    What does the prefix micro (μ) mean?
    Answer

    10−610^{-6}: 1 μg = 10−610^{-6} g

  5. Question
    What is a conversion factor?
    Answer

    A fraction equal to 1, made from an equality, e.g. 1000 m1 km\dfrac{1000\ \text{m}}{1\ \text{km}}.

  6. Question
    How many cm³ are in 1 mL?
    Answer

    1 cm³ (1 mL = 1 cm³)

  7. Question
    How many cm² are in 1 m²?
    Answer

    10410^{4} cm², because (100 cm)² = 10 000 cm²

  8. Question
    Convert 350 mL to L.
    Answer

    350 mL × (1 L / 1000 mL) = 0.350 L

  9. Question
    Convert 72 km/h to m/s.
    Answer

    72 km/h × (1000 m / 1 km) × (1 h / 3600 s) = 20 m/s

  10. Question
    How do you know a conversion factor is the right way up?
    Answer

    The unit you want to remove must cancel: it goes in the denominator of the factor.