HSC Chemistry Module 5 ACTUAL EXAM 2026 -
2027 \NEWEST UPDATE WITH COMPLETE
QUESTIONS AND CORRECT DETAILED ANSWERS
\VERIFIED 100% GRADEDC A+ (Auburn University)
Static Equilibrium:
- Forward + Reverse Reaction at the same rate
- Concentrations remain constant
- Reaction has reached completion
-→
- Reactions + Product do not interact
- Non-Reversible Reaction
Differences between Static
and Dynamic Equilibrium Dynamic Equilibrium
- Forward + reverse reactions at the same rate
- Concentration remains constant
- Reaction never reaches completion
-⇌
- Reactions + Products interact
- Reversible Reactions
You can notice dynamic
How to notice Dynamic equilibrium when the
Equilibrium in a graph concentrations of both reactants
and products stay constant but
dynamic.
For Example: C-Diamond and graphite. At room
What is an example of Static temperature, you are not going to see either reaction
Equilibrium
taking place, so this could be considered a static
equilibrium situation.
What was the aim for the: To observe the several chemical reactions and determine
reversible and irreversible whether they are reversible or not
reaction
, 1. Cobalt(II) Chloride Hydrated
and Dehydrated CoCl2 +
6H2O ⇌ CoCl2.6H2O
2. Iron(III) Nitrate and
Potassium Thiocyanate
Fe+3(aq) + SCN(aq) ⇌
FeSCN+2(aq)
- When you increase concentration of Fe in FeSCN it
Method for the: Reversible
suggest a forward reaction and the darker red shows
and Irreversible Reaction
this
- When you increase concentration of SCN, in FeSCN it
suggests a forward reaction as the solution gets
darker red showing that more reactant are being
used up in products
- Decrease in colour suggest decrease in colour
- The adding of Ag allows for precipitation to be
formed with SCN, therefore removing itself from
FeSCN solution, showing a reverse reaction hence the
murky white
3. Burning
Magnesium
2Mg + O2 →
2MgO
4. Burning Steel Wool
Fe(s) + 3O2(g) → 2Fe2O3(s)
Thermal decomposition of hydrated cobalt (II) chloride
Analyse the Reversibility of (CoCl2·6H2O) which has a pink color will produce the
the four the reactions: dehydrated form of cobalt (II) chloride which has a
Cobalt(II) Chloride Hydrated sky blue color (CoCl2). This reaction is reversible
and Dehydrated because if we add water to the dehydrated sky blue
colored cobalt(II) chloride, it would return to its
original pink color which is the hydrated cobalt(II)
chloride (CoCl2·6H2O).
When iron (III) nitrate [Fe(NO3)3] is mixed with
Analyse the Reversibility of
potassium thiocyanate [KSCN] in solution, an
the four the reactions: Iron
equilibrium mixture of Fe+3, SCN- , and the complex
(III) nitrate and potassium
ion FeSCN+2 is formed. This reaction is also an
thiocyanate
example of a reversible reaction in which addition of
, the ions involved would result in a color change of
the solution.
2027 \NEWEST UPDATE WITH COMPLETE
QUESTIONS AND CORRECT DETAILED ANSWERS
\VERIFIED 100% GRADEDC A+ (Auburn University)
Static Equilibrium:
- Forward + Reverse Reaction at the same rate
- Concentrations remain constant
- Reaction has reached completion
-→
- Reactions + Product do not interact
- Non-Reversible Reaction
Differences between Static
and Dynamic Equilibrium Dynamic Equilibrium
- Forward + reverse reactions at the same rate
- Concentration remains constant
- Reaction never reaches completion
-⇌
- Reactions + Products interact
- Reversible Reactions
You can notice dynamic
How to notice Dynamic equilibrium when the
Equilibrium in a graph concentrations of both reactants
and products stay constant but
dynamic.
For Example: C-Diamond and graphite. At room
What is an example of Static temperature, you are not going to see either reaction
Equilibrium
taking place, so this could be considered a static
equilibrium situation.
What was the aim for the: To observe the several chemical reactions and determine
reversible and irreversible whether they are reversible or not
reaction
, 1. Cobalt(II) Chloride Hydrated
and Dehydrated CoCl2 +
6H2O ⇌ CoCl2.6H2O
2. Iron(III) Nitrate and
Potassium Thiocyanate
Fe+3(aq) + SCN(aq) ⇌
FeSCN+2(aq)
- When you increase concentration of Fe in FeSCN it
Method for the: Reversible
suggest a forward reaction and the darker red shows
and Irreversible Reaction
this
- When you increase concentration of SCN, in FeSCN it
suggests a forward reaction as the solution gets
darker red showing that more reactant are being
used up in products
- Decrease in colour suggest decrease in colour
- The adding of Ag allows for precipitation to be
formed with SCN, therefore removing itself from
FeSCN solution, showing a reverse reaction hence the
murky white
3. Burning
Magnesium
2Mg + O2 →
2MgO
4. Burning Steel Wool
Fe(s) + 3O2(g) → 2Fe2O3(s)
Thermal decomposition of hydrated cobalt (II) chloride
Analyse the Reversibility of (CoCl2·6H2O) which has a pink color will produce the
the four the reactions: dehydrated form of cobalt (II) chloride which has a
Cobalt(II) Chloride Hydrated sky blue color (CoCl2). This reaction is reversible
and Dehydrated because if we add water to the dehydrated sky blue
colored cobalt(II) chloride, it would return to its
original pink color which is the hydrated cobalt(II)
chloride (CoCl2·6H2O).
When iron (III) nitrate [Fe(NO3)3] is mixed with
Analyse the Reversibility of
potassium thiocyanate [KSCN] in solution, an
the four the reactions: Iron
equilibrium mixture of Fe+3, SCN- , and the complex
(III) nitrate and potassium
ion FeSCN+2 is formed. This reaction is also an
thiocyanate
example of a reversible reaction in which addition of
, the ions involved would result in a color change of
the solution.
