Question
Rajah 12 menunjukkan eksperimen yang dilakukan untuk mengembangkan belon.
Diagram 12 shows an experiment conducted to expand a balloon.
Antara berikut, gas manakah yang terhasil dan menyebabkan belon mengembang?
Which of the following gas is produced and caused the balloon to expand?
A \mathrm{H}_{2}
B \mathrm{O}_{2}
C \mathrm{NO}_{2}
D \mathrm{CO}_{2}
Answer
Hi Farhaini,
Sodium hydrogen carbonate is NaHCO_3 (a weak base), vinegar is an organic acid, specifically CH_3COOH (ethanoic acid)
We construct a chemical equation, when a base reacts with an acid, a neutralization reaction occurs:
NaHCO_3 + CH_3COOH → CH_3COONa + H_2O + CO_2
So the gas produced is CO_2. Hope this helps! 
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Thank you very much ! 
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