Lead II carbonate decomposes to give lead II oxide and carbon dioxide: grams of lead II oxide will be produced by the decomposition of 7.50g of lead II carbonate. BTW.. This is the third time I ask this question despite the problem solved and answer posted the answer gets deleted before I can view it by another person ..why, please help.

7is b8 is d9 is c10 is a11 is d

Must be negative.substance increases

Sorry i dont understand the question can you rephase it?

You would be correct, boiling water does disinfect contamination.    the property of disinfecting means to kill  germs, bacteria and other pathogens or contamination  that might cause an infection or cause a person to become sickly. a couple methods of disinfecting are using soap, other cleaning supplies or by simply "boiling" the contaminate.  the reason why boiling water disinfects certain attributes is because some cells cannot survive the heat and pressure.