1. Coal dusts burn faster than a single lump of coal., 2. Hydrogen and Oxygen react smoothly at room temperature in the presence of finely divided platinum, 3. The rates of chemical reactions approximately double for each 10◦C rise in temperature., 4. Milk sours if left out for a day or two but will last two weeks in the refrigerator., 5. Wood burns explosively in pure O2, but slowly in air which is about 20% O2.

Rate of Chemical Reaction

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