Chemistry Chegg Worksheet

ENGR 1540 Worksheet 6 Chapter 3

1. Balance these equations.

a. Al(s)+O2(g)→Al2O3(s)

b. N2(g)+H2(g)→NH3(g)

c. C6H6(l)+O2(g)→H2O(l)+CO2(g)

2. Balance the following equations.

a. CaC2(s)+H2O(l)→Ca(OH)2(s)+C2H2(g)

b. (NH4)2Cr2O7(s)→Cr2O3(s)+N2(g)+H2O(g)

c. CH3NH2(g)+O2(g)→CO2(g)+N2(g)+H2O(g)

3. An explosive whose chemical formula is C3H6N6O6 produces water, carbon dioxide, and nitrogen gas when detonated in oxygen. Write the chemical equation for the detonation reaction of this explosive.

4. A number of compounds are used in cement, and reactions among them occur when water is added. In one, CaO reacts with Al2O3 and water to form Ca3Al2(OH)12. Write a balanced chemical equation for this process.

5. Ethanol, C2H5OH, is found in gasoline blends used in many parts of North America. Write a balanced chemical equation for the combustion of C2H5OH to form CO2 and H2O.

6. Balance the following equations.

a. reaction to produce “superphosphate” fertilizer:

Ca3(PO4)2(s)+H2SO4(aq)→Ca(H2PO4)2(aq)+CaSO4(s)

b. reaction to produce diborane, B2H6:

NaBH4(s)+H2SO4(aq)→B2H6(g)+H2(g)+Na2SO4(aq)

c. reaction to produce tungsten metal from tungstem(VI) oxide:

WO3(s)+H2(g)→W(s)+H2O(l)

d. decomposition of ammonium dichromate:

(NH4)2Cr2O7(s)→N2(g)+H2O(l)+Cr2O3(s)

7. Write balanced chemical equations for the following reactions.

a. production of ammonia, NH3(g), by combining N2(g) and H2(g)

b. production of methanol, CH3OH(l), by combining H2(g) and CO(g)

c. production of sulfuric acid by combining sulfur, oxygen, and water

8. Diborane and related compounds were proposed as rocket fuels in the 1950s. A representative reaction for this class of molecules is that of B2H6 and O2 to form B2O3 and H2O. Write the balanced chemical equation for this process.

9. Silicon nitride, Si3N4, is used as a reinforcing fiber in construction materials. It can be synthesized from silicon tetrachloride and ammonia. The other product is ammonium chloride. Write the balanced chemical reaction for this process.

10. Classify the following compounds as electrolytes or nonelectrolytes:

a. potassium chloride, KCl

b. hydrogen peroxide, H2O2

c. methane, CH4

d. barium nitrate, Ba(NO3)2