A potato cylinder's mass changes from 2.50 g to 2.30 g. Calculate the percentage change.
Salam Academy Original Practice · Proposed mark scheme
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12 questions
1.0 mol dm⁻³ glucose is diluted ×10 four times. What is the final concentration (×10⁻⁴ mol dm⁻³)?
Salam Academy Original Practice · Proposed mark scheme
What volume (cm³) of 2.0 mol dm⁻³ sucrose is needed to make 50 cm³ of 0.40 mol dm⁻³?
Salam Academy Original Practice · Proposed mark scheme
In the osmosis practical, the water potential of the tissue equals that of the solution where
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A calibration curve is used in colorimetry to
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A correct biological drawing should
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A large standard deviation indicates
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An inoculating loop is flamed before use to
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Enzyme experiments use a buffer to
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Calculate the mean of 4.2, 4.6, 4.4 and 4.8.
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Petri dishes of bacteria are incubated at 25 °C in schools to
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Two means have overlapping standard deviation bars. This suggests
Salam Academy Original Practice · Proposed mark scheme