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The student did another experiment using 20 cm3 of sodium hydroxide solution with a concentration of 0.18 mol/dm3 . Relative formula mass (Mr) of NaOH = 40 Calculate the mass of sodium hydroxide in 20 cm3 of this solution.

Answer= 0.144g Working out: mol= conc x volume (in dm^3)mass = mol x RFFSo,mol = 0.18 x (20/1000) = 0.0036mol Mass= 0.036 x 40 = 0.144g
CI
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State the functions of five organelles in animal cells

Nucleus- controls the activity of the cellMitochondria- site of aerobic respirationCytoplasm- site of biochemical reactions, including anaerobic respiration Cell membrane- Allows transport of materials into ...
CI
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How are red blood cells adapted to carrying oxygen

Biconcave discs- to increase surface area for oxygen carriage Haemoglobin- increases affinity for oxygen uptake at the lungs. However, at the respiring tissues, the increased CO2 concentration allow release ...
CI
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Define osmosis

Osmosis is the movement of water across a semi-permeable membrane
CI
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What sort of questions do they ask in Oxbridge interviews?

Beyond the 'typical medical school interview questions' that are still fair game, oxbridge interviews are infamous for employing an array of unconventional questions that can be intimidating for the unprepar...
MG
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