Food waste, like a feather or a bone, fall into food, causing contamination.
Physical
Chemical
Pest
Cross-conta

This is a characteristic of the elements in the periodic table that shows a pattern. it may increase or decrease across or down the table.

12. calculate the hydroxide ion concentration of a solution with ph = 3.25. show all calculations leading to an answer

)benzene and toluene form nearly ideal solutions. consider an equimolar solution of benzene and toluene. at 20 °c the vapour pressures of pure benzene and toluene are 9.9 kpa and 2.9 kpa, respectively. the solution is boiled by reducing the external pressure below the vapour pressure. calculate (i) the pressure when boiling begins, (ii) the composition of each component in the vapour, and (iii) the vapour pressure when only a few drops of liquid remain. assume that the rate of vaporization is low enough for the temperature to remain constant at 20 °c.