Ws 2: Writing Balanced Chemical Equations Step 1: Circle the reactants and underline the products in the problems below. Step 2: Write the unbalanced equations; show all states of matter. Step 3: Balance the equation



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WS 2: Writing Balanced Chemical Equations

Step 1: Circle the reactants and underline the products in the problems below.

Step 2: Write the unbalanced equations; show all states of matter.

Step 3: Balance the equation
1. Fluorine gas reacts with solid sodium chloride to form solid sodium fluoride and chlorine gas.

F2(g) + 2 NaCl(s)  2 NaF(s) + Cl2(g)


2. Nitrous oxide gas (systematic name: dinitrogen monoxide) and water vapor are produced by carefully heating solid ammonium nitrate.

NH4NO3(s)  N2O(g) + 2 H2O(g)

3. At high temperatures and in the presence of a catalyst, nobles gases can be made to form stable compounds. Such an example is xenon gas which combines with fluorine gas to produce solid xenon tetrafluoride.

Xe(g) + 2 F2(g)  XeF4(g)

4. Liquid phosphorus trichloride reacts with water to form phosphorous acid and hydrochloric acid in solution.

PCl3(l) + 3 H2O(l)  H3PO3(aq) + 3 HCl(aq)

5. Solid manganese(II) peroxide reacts with aqueous hydrochloric acid to form manganese(II) chloride, chlorine gas, and water.

MnO2(s) + 4 HCl(aq)  MnCl2(aq) + Cl2(g) + 2 H2O(l)

6. When aqueous solutions of potassium chromate and barium chloride are mixed, barium chromate settles out of solution as a solid leaving potassium chloride in solution.


K2CrO4(aq) + BaCl2(aq)  BaCrO4(s) + 2 KCl(aq)

7. When lead(II) sulfide is heated to high temperatures in pure oxygen gas, solid lead(II) oxide forms with the release of gaseous sulfur dioxide.

2 PbS(s) + 3 O2(g)  2 PbO(s) + 2 SO2(g)

8. Aqueous magnesium nitrate reacts in solution with aqueous potassium hydroxide to yield a magnesium hydroxide precipitate and dissolved potassium nitrate.

Mg(NO3)2(aq) + 2 KOH(aq)  Mg(OH)2(s) + 2 KNO3(aq)

9. Solid mercury(I) oxide when heated yields pure mercury metal and oxygen gas.

2 Hg2O(s)  4 Hg(l) + O2(g)

10. Carbon dioxide gas and water vapor are produced when ethane gas (C2H6) burns in the presence of atmospheric oxygen.


2 C2H6(g) + 7 O2(g)  4 CO2(g) + 6 H2O(g)


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