Unit 1 Section D Summary HW Problems Pt. 3

#7:
a. 3
b. 2
c. 1

#8:
a. 

b.

c.

#9:
a. 1, 3, 2, 3
b. 2, 25, 16, 18

#10:
a. Yes, the atoms are conserved.
b. The chemical equation is balanced, but he changed the subscripts from the original equation.
c. Na2SO4 + 2 KCl -> 2 NaCl + K2SO4

#11:
An alloy is a solid combination of atoms of tow or more metals.

#12:
I use brass because it's common in plumbing and light fixtures, and I use bronze because it's in coins.