can some body Expalin what they meant here one by one ?

Question

reactions that run to completion :


product gas ( nn reversible reaction)
product is unioized like water ( non reversible reaction
percipitation is fromed ( non reversbile reaction )

Answer 1

I'm not exactly sure what you're asking here as the descriptions are relatively self explanatory, but I'll try and help

All reactions described are non-reversible. So for the following reaction
A + B ------> C + D
A + B are what you start with (the Reactants) and
C + D are what you finish with (the Products).
A non-reversible reaction is one where once you react A + B to get C + D, you can't go backwards and get A + B back.

1: the product of the reaction is a gas (as opposed to a liquid or a solid). An example would be the electrolysis of water where 2H2O (liquid) -----> 2H2 (gas) + O2 (gas) You can't get the gases back and turn them into water again.

2: Product is ionised. Ionisation is where you break a molecule up, typically by dissolving it in water. Once its dissolved, you can't "undissolve" it! For example adding concentrated pure HCl to water, this acid dissociates into
HCl (liquid) ------> H+(aqueous) + Cl- (aqueous)

3: Precipitate is formed. A precipitate is a non soluble solid formed as the result of the chemical reaction. A precipitate is a solid that literally "falls" out of the solution and accumulates on the bottom of the reactuion vessel.

An example is Zinc sulphate reacting with silver nitrate (two liquids) to form zinc nitrate (a liquid) and Silver sulphate (an insoluble solid (precipitate)).

Hope this what you were after.

Answer 2

Reactions run to completion because one of the products is removed from the reaction.

NaHCO3 + HCl ===> Na+ + Cl- + H2O + CO2(gas, bubbles out of solution, and so is unavailable for reverse reaction)

NaOH + HCl ===> Na+ + Cl- + H2O(water is only slightly ionized, so ions are unavailable for a reverse reaction)

AgNO3 + NaCl ===> Na+ + NO3- + AgCL(solid, so Ag+ and Cl- are unavailable for reverse reaction)