NO 2 is a brown gas that can be used to form nitric acid.(i) NO2 is a free radical.Define free radical...................................................................................................................................... [1](ii) NO2 has a catalytic role in the oxidation of atmospheric sulfur dioxide.Write equations to show the catalytic role of NO 2 in this oxidation................................................................................................................................................................................................................................................................................. [2](iii) State one environmental consequence of the oxidation of atmospheric sulfur dioxide...........................................................................
Question
NO 2 is a brown gas that can be used to form nitric acid.(i) NO2 is a free radical.Define free radical...................................................................................................................................... 1 NO2 has a catalytic role in the oxidation of atmospheric sulfur dioxide.Write equations to show the catalytic role of NO 2 in this oxidation................................................................................................................................................................................................................................................................................. 2 State one environmental consequence of the oxidation of atmospheric sulfur dioxide...........................................................................
Solution
(i) A free radical is a molecule that has an unpaired electron in its outermost shell. This makes it highly reactive, as it seeks to pair up this electron through chemical reactions.
(ii) The catalytic role of NO2 in the oxidation of atmospheric sulfur dioxide can be represented by the following equations:
Step 1: NO2 + SO2 -> NO + SO3 Step 2: NO + O2 -> NO2
In the first step, NO2 reacts with SO2 to form NO and SO3. In the second step, NO reacts with O2 to regenerate NO2. This allows NO2 to act as a catalyst, as it is not consumed in the overall reaction.
(iii) One environmental consequence of the oxidation of atmospheric sulfur dioxide is the formation of acid rain. When sulfur dioxide is oxidized, it forms sulfur trioxide (SO3), which can combine with water in the atmosphere to form sulfuric acid (H2SO4). This acid can fall to the earth as acid rain, which can damage buildings, harm vegetation and aquatic life, and contribute to respiratory problems in humans and animals.
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