They do this so that when you drink it or use it the contaminates that used to be in it dont make you sick
Answer:
<u>Balanced equation:</u>
Explanation:
The chemical reaction between Lead(II) Nitrate and potassium carbonate is as follows.
<u>Ionic equation:</u>
Cancel the same ions on the both sides of the reaction.
The net ionic equation is as follows.
So half life is the time taken for a sample to decay to half its original mass, its a constant and applies to any original mass, it could be 5g or 1kg, it will take the same amount of time for the original mass to half. In this case the half life is 3 days.
After 3 days the sample will be at half its original mass, now 50g.
Now we can treat the 50g as if its a new sample. After another 3 days (6 days in total) there will be half of 50g left, = 25g.
Group 18 is the only group in periodic table in which all the elements are nonmetals. This group contains F, Cl, Br, I and At and also the other name of this group is halogen which means salt producer.
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