Wednesday Night Homework

Wednesday Night Homework 

By Kelly Moran

Questions 7-12 on pg. 141

7.) a.) 3 

     b.) 2

     c.) 1

 8.) a.) 1 WO3 + 3 H2 = 1 W + 3  H20

      

      b.) 2 PbS + 3 O2= 2 PbO + 2SO2

      c.) 4 Fe + 3 O2 = 2 Fe2O3

9.) a.) 1, 3, 2 3

     b.) 2, 25, 16, 18

10.) a.) Left           Right   The atoms are conserved 

             Na= 2       Na=2

             S=1          Cl= 1

             K= 2        K= 2

             Cl= 1       S=1

             O= 4        O= 4

        

        b.) No he did not because he balanced the equation by changing subscripts which is bad because that changes the identity of the compound. You can only balance a chemical equation with coefficients.

        c.) 1, 2, 2, 1 are the coefficients in this chemical equation to make it balanced.  

11.) An alloy is a solid solution mixed together with two or more different metal elements.

12.) Brass and Steel are two examples.