Answer:
Explanation:
kenetic is made for thermal things
Scenes the chair wheels are up the person is rolling backwards and if the wheels were down then the person would go forwards
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You would know a decomposition reaction occurred if the reactants separated. For example from AB → A+B.
Now if you look at your options only 1 works out for that equation. Letter A.
From the compound K2CO3 it split up to K2O +CO2
It cannot be letter B because synthesis/combination occurred. The same goes for letter C. Letter D, single displacement occurred.
Again, the answer is A.