please show work so i can lean how to do it. Thank you :)

1. Do the properties of an element change when it combines with another element to form a compound? Explain.

5. In a chemical formula, what information do the subscripts convey?

9. What is the difference between a molecular element and an atomic element? List the elements that occur as diatomic molecules. 13. Identify the block in the periodic table of metals that tend to form more than one type of ion.

17. How are compounds containing a polyatomic ion named?

21. What is the basic form for the names of binary acids?

25. Two samples of sodium chloride are decomposed into their constituent elements. One sample produces 4.65 g of sodium and 7.16 g of chlorine, and the other sample produces 7.45 g of sodium and 11.5 g of chlorine. Are these results consistent consistent with the law of constant composition? Explain your answer.

29. Use the law of constant composition to complete the table summarizing the amounts of nitrogen and oxygen produced upon the decomposition of several samples of dinitrogen monoxide. Mass N2O Mass N

33. Write chemical formulas for compounds containing: (a) three iron atoms for every four oxygen atoms (b) one phosphorus atom for every three chlorine atoms (c) one phosphorus atom for every five chlorine atoms (d) two silver atoms for every oxygen atom .

37. Determine the number of each type of atom in each formula. (a) MgCl2 (b) NaNO3 (c) Ca(NO2)2 (d) Sr(OH)2