Chemical Formulae and Structural Representation

How the real exam tests it

Questions from real CSCA papers that test this concept. Work each one out before you open the answer.

1. CSCA Chemistry April 2026 Past Paper
   The name of $\mathrm{AgNO_{3}}$ is ( ).
   • A. Silver nitrite
   • B. Silver nitrate
   • C. Copper nitrate
   • D. Silver nitrogenate
   Show answer & solution

   Answer: B

   Answer: B $\mathrm{AgNO_{3}}$ is silver nitrate.
   Take the full CSCA Chemistry April 2026 Past Paper — timed & graded
2. CSCA Chemistry March 2026 Past Paper
   Which substance name and formula pair is correct？
   • A．Caustic soda－ $\mathrm { Na } _ { 2 } \mathrm { CO } _ { 3 }$
   • B．Quicklime－ $\mathrm { Ca } ( \mathrm { OH } ) _ { 2 }$
   • C．Soda ash－ $\mathrm { NaHCO } _ { 3 }$
   • D．Blue vitriol－ $\mathrm { CuSO } _ { 4 } \cdot 5 \mathrm { H } _ { 2 } \mathrm { O }$
   Show answer & solution

   Answer: D

   A: Caustic soda $= \mathrm { NaOH }$ (not $\mathrm { Na } _ { 2 } \mathrm { CO } _ { 3 }$ ). B: Quicklime $= \mathrm { CaO } \left( \right.$ not $\left. \mathrm { Ca } ( \mathrm { OH } ) _ { 2 } \right)$. C: Soda ash $= \mathrm { Na } _ { 2 } \mathrm { CO } _ { 3 }$ (not $\mathrm { NaHCO } _ { 3 }$ ). D: Blue vitriol $= \mathrm { CuSO } _ { 4 } \cdot 5 \mathrm { H } _ { 2 } \mathrm { O } \checkmark$. Answer: D.
   Take the full CSCA Chemistry March 2026 Past Paper — timed & graded