Question
How does baking powder differ from baking soda?
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$\text{Ca}\ +\ \text{H}_2\text{O}\xrightarrow{\ \ \ \ \ \ \ \ \ \ \ }\text{CaOH}\ +\ \text{H}$
$\text{Fe}\ +\ 4\text{H}_2\text{O}\xrightarrow{\ \ \ \ \ \ \ \ \ \ }\text{Fe}_3\text{O}_4\ +\ \text{H}_2$