The first one is color change
Second is the precipitate present
Explanation:
(a) According to Le Chatelier's principle, any disturbance caused in an equilibrium reaction will shift the eqilibrium in a direction that will oppose the change.
For example, 
So, in this reaction when we any of the reactants then it means there is less stress on reactant side. Hence, the reaction will move in the backward direction.
Whereas when we remove 
then there will be decrease in concentration of products as the concentration of carbon dioxide has decreased. Hence, the reaction will shift on the product side, that is, reaction will shift in the forward direction.
Thus, we can conclude that out of the given options removing as it is formed would force the reaction to favor the produc to favor the products.
(b) As the reaction equation is as follows.
Since, it is an exothermic reaction, that means when temperature is increasing then more amount of energy will release on the product side.
Hence, the reaction will shift on the reactant side, that is on the left hand side equilibrium will shift.
Answer:
Zn(s) -> Zn2+(aq) + 2e
Explanation:
Zinc atoms = no charge
Zinc ions = +ve charge
The process of half equation for zinc is called oxidation .
(oxidation means loss of electrons)
Answer:
The mole fraction of codeine is 5.4%
Explanation:
Mole fraction = Mole of solute / Total moles (Mole solute + Mole solvent)
Solute (Codeine)
Molar mass 299.36 g/m
Mass / Molar mass = Mole → 46.85 g /299.36 g/m = 0.156 moles
Solvent (Ethanol)
Molar mass 46.07 g/m
125.5 g / 46.07 g/m = 2.724 moles
Mole fraction (Codeine) 0.156 / (0.156 + 2.724) → 0.054
