Final answer:
The statement is a) true; when NaHCO₃ is heated above 270°C, it decomposes to form Na₂CO₃, H₂O, and CO₂.
Step-by-step explanation:
When NaHCO₃ is heated above 270°C, it decomposes to form Na₂CO₃, H₂O, and CO₂. The given statement is true. The reaction can be written as:
2 NaHCO₃(s) → Na₂CO₃ (s) + CO₂(g) + H₂O(l)
This reaction shows that sodium carbonate, carbon dioxide, and water are produced from the single substance sodium hydrogen carbonate. This type of reaction is known as a decomposition reaction, which is a process where one compound breaks down into two or more substances.
A decomposition reaction is a type of chemical reaction in which a single compound breaks down into two or more simpler substances. These reactions are the opposite of combination reactions, where simpler substances combine to form a more complex compound.