If your child was born on Christmas, you may hear complaints about fewer birthday presents than other kids and more holiday hoo-ha to contend with. (Both most definitely first-world problems.). As it turns out, Christmas birthdays are not only unfortunate -- they're also almost uniquely uncommon. In fact, December 25 is the least common birthday out of all the days of the year save the one that doesn't even occur annually -- February 29.
In a decomposition reaction a compound is broken into smaller chemical species. AB â A + B. The electrolysis of water into oxygen and hydrogen gas is an example of a decomposition reaction : 2 H 2 O â 2 H 2 + O 2. Another example is the decomposition of potassium chloride into potassium and chlorine gas.
The chemical equation, KClO 3 â KCl + O 2, is an example of which type of reaction? A. decomposition B. single-replacement C. double-replacement D. combustion _____ 8. Which of the following are decomposition reactions? 1. CH 4 (g) + O 2 (g) â CO 2 (g) + H 2 O (l) 2. CaO (s) + CO 2 (g) â CaCO 3 (s) 3. Mg (s) + O 2 (g) â MgO (s) 4. PbCO 3 (s) â PbO (s) + CO 2 (g) A. 2 and 3 B. 2, 3, and 4 C. 4 only D. All are decomposition reactions.