Answer:
what do you need help with i cant see it
Explanation:
The average kinetic energy and thermal energy decreases, and the temperature decreases as well.
The molecular formula shows the exact number of molecules. Therefor, the empirical formula is the simplest formula of the molecular formula
Answer:
CO32−
Explanation:
We have to consider the valencies of the polyatomic ions involved. Recall that it is only a polyatomic ion with a valency of -2 that can form a compound which requires two sodium ions.
When we look closely at the options, we will realize that among all the options, only CO32− has a valency of -2, hence it must be the required answer. In order to be double sure, we put down the ionic reaction equation as follows;
2Na^+(aq) + CO3^2-(aq) ---------> Na2CO3(aq)
The answer is d.
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