Chemical changes and reactions

1. Chemical equations-

2. Balancing chemical equations part 1-

3. Balancing chemical equation part 2-

Questions-

Balance the following chemical equations:

a. CO2 + H2O — — -> C6H12O6 + O2.

b. SiCl4 + H2O — — → H4SiO4 + HCl.

c. Al + HCl — — → AlCl3 + H2.

d. Na2CO3 + HCl — — — -> NaCl + H2O + CO2.

e. C7H6O2 + O2 — — — -> CO2 + H2O.

f. Fe2(SO4)3 + KOH — — — → K2SO4 + Fe(OH)3

g. Ca3(PO4)2 + SiO2 — — — → P4O10 + CaSiO3

h. KClO3 — — → KClO4 + KCl.

4. Different types of chemical reactions-

Questions-

a. We need to balance a skeletal chemical equation, justify.

b. Name the type of chemical reaction represented by the following chemical equations.

i. CaO + H2O — — →Ca(OH)2

ii.3 BaCl2 + Al2(SO4)3 — — — -> 3BaSO4 + 2AlCl3

iii. 2FeSO4 — — → Fe2O3 + SO2 + SO3.

c. Write the chemical equation of the reaction in which the following changes have taken place with an example of each:

i. Change in color

ii. Change in temperature

iii. Formation of precipitate