5. Self-Check Assessment

SC1. For each word equation, write the chemical formula, balance the reaction, and determine what kind of reaction it is. Then, hit each tap to compare your answer with the given solution. 

2NaOH + H2CO3--> Na2CO3 + H2O -double replacement or acid-base neutralization
    
8ZnS + 4O2--> 8ZnO + S8 -single replacement

SC2. Try to answer the following two questions. Then, hit the dropdown sign to check your answer.

                                                                                                                

n and M are given. m=? m = nxM m= 0.2molx18.015g/mol=3.603g
. Molar mass of Fe=55.85 g/mol. Molar mass of Cl=35.45 g/mol. M of FeCl2= 55.85 +2x35.45=126.75g/mol. Then, n= m/M = 5.3g/126.75 g/mol=0.042 mol