Chemistry Around Us

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1. Which formula represents a molecule containing two hydrogen atoms and one oxygen atom?

   • CO₂
   • H₂O₂
   • H₂O
   • O₂

2. Which gas do humans exhale in a higher proportion than they inhale because cells produce it during respiration?

   • Carbon dioxide
   • Nitrogen
   • Helium
   • Hydrogen

3. Table salt is chiefly which compound?

   • Calcium carbonate
   • Potassium nitrate
   • Sodium bicarbonate
   • Sodium chloride

4. Which gas is required for the ordinary combustion of a candle?

   • Carbon dioxide
   • Oxygen
   • Neon
   • Nitrogen

5. Complete combustion of methane in sufficient oxygen produces carbon dioxide and what other substance?

   • Ammonia
   • Hydrogen
   • Water
   • Chlorine

6. A solution of ammonia in water generally has which acid–base character?

   • Basic
   • Strongly acidic
   • Neutral in every concentration
   • Unable to affect pH

7. Marble and limestone react with dilute acid because they contain which negatively charged ion?

   • Chloride
   • Sulfate
   • Nitrate
   • Carbonate

8. When hydrogen chloride dissolves in water, the resulting aqueous solution is commonly called what?

   • Nitric acid
   • Hydrochloric acid
   • Sulfuric acid
   • Acetic acid

9. Glucose and fructose both have the molecular formula C₆H₁₂O₆ but different structures. What is this relationship called?

   • Isomerism
   • Radioactivity
   • Neutralization
   • Polymerization

10. Why does baking soda help cake batter rise when it reacts with an acidic ingredient?

    • It freezes water in the batter
    • It converts flour into oxygen
    • It releases carbon dioxide bubbles
    • It removes all moisture