D.5-D.7

p. 131

1.
a. 2C(s) + O2(g) ---> 2CO(g)
b. BALANCED

2. 2CuO (s) + C(s)---> C(s) + CO2(g)

3. O2 + O3 ---> O2 + O3

4. N 2H3 (g) + O2 (g) ---> NO2  (g) + H2O (l)

5. BALANCED

6. C8H18 (l) + 2 O2(g) + 9H2) (g) + Ag(s)

p. 140

2.
a. NaHCO3 + HCl ---> NaCl + H2O +C02
b. C6H12O6 + 6 O2 ---> 6 CO2  6 H2O

4. Scientific Law is a statement based on repeated experimental observations that describe some aspect of the world. A scientific law always applies under the same conditions, and implies that there is a relationship involving elements.

6. This is because the law states that atoms are forever! This means that atoms are rearranged, not disposed or thrown away.