Which of following changes that affect the composition of our atmosphere involve physical changes and which involve chemical reactions?
1. Oxygen gas changes to ozone during thunderstorms.
2. Freezing rain develops when a warm air mass overrides a cold air mass.
3. Carbon dioxide is produced by the combustion of gasoline in an automobile engine.
4. Fog forms from water vapor when the temperature drops below the dew point.
5. When coal, oil, and natural gas are decomposed in landfills they produce methane gas.
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The data below were determined for the reaction shown below. s2o82– + 3i – (aq) → 2so42– + i3– expt. # [s2o82–] (m) [i –] (m) initial rate 1 0.038 0.060 1.4 × 10 – 5 m/s 2 0.076 0.060 2.8 × 10 – 5 m/s 3 0.076 0.030 1.4 × 10 – 5 m/s the rate law for this reaction must be:
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Which of following changes that affect the composition of our atmosphere involve physical changes an...
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