Baking powder is a mixture of sodium bicarbonate (baking soda) and a mild edible acid, usually tartaric acid. When moistened and heated, they react to release CO₂, causing dough to rise. Baking soda alone requires an external acidic ingredient. The acid ensures complete reaction and avoids a bitter taste.
Explanation:
Zinc is more reactive than iron (above in the reactivity series), so it can displace iron: Zn + FeSO₄ → ZnSO₄ + Fe. Silver, copper, and mercury are less reactive than iron and cannot displace it. The reactivity series predicts displacement: a more reactive metal displaces a less reactive one.
Explanation:
Ethane (C₂H₆) is an alkane with single bonds, thus saturated. Ethene (C₂H₄) is an alkene (double bond), propyne (C₃H₄) is an alkyne (triple bond), benzene (C₆H₆) has delocalized π electrons—all unsaturated. Saturated compounds contain only C-C single bonds and maximum possible hydrogen. They undergo substitution reactions.
Explanation:
Hydrogen has a very high calorific value of about 141.9 kJ/g (higher heating value) or ~150 kJ/g approximate. This makes it an excellent fuel, though storage is challenging. Methane ~55 kJ/g, petrol ~47 kJ/g. Hydrogen fuel cells use it efficiently.
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