ELL Level 2 - Equilibrium Observations 1

PCl_{5 (g)}  ⇌ PCl_3(g) + Cl_2(g) Endothermic

(PCl_5(g) and PCl_3(g) are colourless ) (Cl_2(g) is green)

DECREASE PRESSURE

• No change

• green fades

• Darker green

• Can not tell from information given

N₂O_{4 (g)}  ⇌ 2NO_2(g) ∆H = + 57.2 kJ.mol^-1

(N₂O_{4 (g) is} colourless ) (NO_2(g) is brown)

INCREASE TEMPERATURE

• No change

• Lighter brown

• Darker brown

• Can not tell from information given

BiCl₃ + H₂O ⇌ BiOCl + 2HCl

(BiCl₃ is Colourless ) (BiOCl is milky)

Adding water

• No change

• More milky

• Less milky

• Can not tell from information given

PCl_{5 (g)}  ⇌ PCl_3(g) + Cl_2(g) Endothermic

(PCl_5(g) and PCl_3(g) are colourless ) (Cl_2(g) is green)

INCREASE TEMPERATURE

• No change

• green fades

• Darker green

• Can not tell from information given

H_{2 (g)} + I_{2 (g)} ⇌ 2HI _(g) Enthalpy is -ve

(H_2(g) and HI_(g) are colourless ) (I_2(g) is purple)

REMOVE hydrogen gas

• No change

• Purple fades

• Darker purple

• Can not tell from information given

BiCl₃ + H₂O ⇌ BiOCl + 2HCl

(BiCl₃ is Colourless ) (BiOCl is milky)

Adding HCl

• No change

• More milky

• Less milky

• Can not tell from information given

H_{2 (g)} + I_{2 (g)} ⇌ 2HI _(g) Enthalpy is -ve

(H_2(g) and HI_(g) are colourless ) (I_2(g) is purple)

ADD A CATALYST

• No change

• Purple fades

• Darker purple

• Can not tell from information given

BiCl_3(aq) + H₂O_(l) ⇌ BiOCl_(s) + 2HCl_(aq)

(BiCl₃ is Colourless ) (BiOCl is milky)

Change pressure

• No change

• More milky

• Less milky

• Can not tell from information given

N₂O_{4 (g)}  ⇌ 2NO_2(g) ∆H = + 57.2 kJ.mol^-1

(N₂O_{4 (g) is} colourless ) (NO_2(g) is brown)

INCREASE PRESSURE

• No change

• Lighter brown

• Darker brown

• Can not tell from information given

PCl_{5 (g)}  ⇌ PCl_3(g) + Cl_2(g) Endothermic

(PCl_5(g) and PCl_3(g) are colourless ) (Cl_2(g) is green)

DECREASE TEMPERATURE

• No change

• green fades

• Darker green

• Can not tell from information given