Which parts, Q , R or S , contain carbon? ( a ) Q and R ( b ) Q and S – Free A5
Which parts, Q , R or S , contain carbon? ( a ) Q and R ( b ) Q and S ( c ) R and S ( d ) Q , R and S
Answer
🧪 How to Identify Carbon-Containing Parts in a Substance
🔬 Understanding Carbon Presence in Compounds
Carbon is the fundamental element of life and forms the basis of all organic compounds. In chemistry, any compound that contains carbon atoms is generally considered organic, although some carbon-containing compounds like CO2 and carbonates are exceptions classified as inorganic.
To determine which parts—Q, R, or S—contain carbon, it is essential to analyze the molecular or structural formulas of each part. Look for the presence of the carbon symbol (C) or groups like CH4, COOH, C=O, etc.
✅ Typical Examples of Carbon-Containing Substances
- Organic Molecules: Proteins, carbohydrates, lipids, nucleic acids
- Carbon Compounds: Methane (CH4), Ethanol (C2H5OH), Glucose (C6H12O6)
- Inorganic But Carbon-Containing: Carbon dioxide (CO2), Carbon monoxide (CO), Carbonates (CaCO3)
📘 Selecting the Correct Option
(a) Q and R
(b) Q and S
(c) R and S
(d) Q, R and S
If all parts—Q, R, and S—contain carbon-based structures, then the correct answer is option (d). This means carbon is present in all three sections, possibly in different chemical forms. A detailed molecular analysis or structural diagram is often used to confirm this.
📌 Pro Tip for Students
Always look at the structural or molecular formulas given in a diagram or chemical equation. If a compound contains carbon atoms, it will usually be marked with a ‘C’ or include a carbon-based group.