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Chemical Reaction Practice Questions

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This solution is provided in approximately 821 words in an attached .doc file. It discusses how chemicals in water may bond together to form precipitates, as well as explains redox reactions.

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Please answer the following concerning these answers from my test.

Question 3a)

Please show step by step in a simple way how they got PBCOsub3 + NANOsub3.
Then why is Nosub3 not split up like Pb(charge 2+)?
Why is PBCOsub3 not split up?

ANSWER:

The chemical reaction is as such...

Pb(NO3)2 (aq) + Na2CO3 (aq) → PbCO3 (s) + 2 NaNO3 (aq)

This reaction can be thought of as mixing two containers with different chemicals dissolved in water
Container 1: has Pb(NO3) dissolved in water. That means there are Pb2+ ions and NO3- ions in the water.
The NO3- is not split apart because the N is covalently bonded (very strong chemical bond) to all 3 of the oxygens. This is called a molecular ion and typically molecular ions are stable in water and do not change.
Container 2: has Na2CO3 dissolved in water. There are Na+ ions and CO32- ions in the water.
The CO3- is not "split up" for the same reasons NO3- is not split up. (see above)

Another way to write the chemical reaction would be....

Pb2+ (aq) + 2 NO3- (aq) + 2 Na+ (aq) + CO32- ...

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