Classification of Matter

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1. CSCA Chemistry December 2025 Past Paper
   Which of the following substances is a pure substance? ( )
   • A. Hydrochloric acid solution
   • B. A mixture of ice and water
   • C. Air
   • D. Saturated sodium chloride solution
   Lihat jawaban & pembahasan

   Jawaban: B

   Answer: B A pure substance contains only one substance. A mixture of ice and water has a solid and a liquid phase, but both are H₂O, so it is a pure substance. Hydrochloric acid, air and saturated salt solution all contain several components and are mixtures.
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2. CSCA Chemistry April 2026 Past Paper
   Which of the following changes is a chemical change? ( )
   • A. Complete combustion of carbon
   • B. Crushing paper
   • C. Freezing of water
   • D. Evaporation of alcohol
   Lihat jawaban & pembahasan

   Jawaban: A

   Answer: A Carbon undergoes complete combustion to form carbon dioxide - a new substance is produced, so it is a chemical change; the others are physical changes.
   Kerjakan CSCA Chemistry April 2026 Past Paper lengkap — berwaktu & dinilai
3. CSCA Chemistry March 2026 Past Paper
   Which everyday phenomenon involves a chemical change？
   • A．Refrigerator cooling
   • B．Rusting of an iron pot
   • C．Glass breaking
   • D．Evaporation of alcohol
   Lihat jawaban & pembahasan

   Jawaban: B

   Chemical change produces new substances. A/C/D are physical. B: Iron rusting = $\mathrm { Fe } + \mathrm { O } _ { 2 } + \mathrm { H } _ { 2 } \mathrm { O } \rightarrow \mathrm { Fe } _ { 2 } \mathrm { O } _ { 3 } \cdot \times \mathrm { H } _ { 2 } \mathrm { O }$. Answer: B．
   Kerjakan CSCA Chemistry March 2026 Past Paper lengkap — berwaktu & dinilai