Starting with 30 bacteria and doubling factor 2, the count after n hours is 30 x 2ⁿ. Thus, after 2 hours there are 120, after 4 hours 480 and after n hours 30 x 2ⁿ.
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If blood behaved like a true suspension, its larger particles would settle when left undisturbed. In blood, the dispersed phase consists of blood cells and the dispersion medium is plasma, remaining dispersed throughout.
Evaporation is preferred to obtain a solute when the solvent is not needed. Crystallization is preferred to obtain a pure solid. Distillation is preferred when recovering the solvent or separating miscible liquids.
Distillation is suitable because the liquids are miscible and their boiling points differ by 30 °C. The liquid A, having the lower boiling point, vaporises first and is then condensed separately.
Yes, cooking oil and water form separate layers because they are immiscible and oil is less dense. Oil forms the upper layer. A separating funnel can separate the two layers by draining water first.