Appropriate Units in Calculations (AQA A-Level Biology): Quizzes

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Appropriate Units in Calculations
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What is the correct SI abbreviation for the unit of time?

s

Which SI base unit is used for mass?

kilogram (kg)

What is the preferred unit for concentration of substances in solutions?

mol dm⁻³

What factor does the prefix 'micro' (μ) represent?

10−610^{-6}

What factor does the prefix 'nano' (n) represent?

10−910^{-9}

When converting from larger to smaller units, what operation do you perform?

Multiply by 1000 for each step

How many micrometres (μm) are in 1 metre?

1,000,000 μm

What conversion factor is used when converting square units?

× or ÷ 1,000,000

What conversion factor is used when converting cubic units?

× or ÷ 1,000,000,000

What is 0.0000078 expressed in standard form?

7.8×10−67.8 \times 10^{-6}

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