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Worksheet 20 . Topic 5

Set C: Conservation in equations Objective: To test your ability to determine if equation is
balanced or not.

Write “balanced” next to those equations that are correctly balanced (demonstrate conservation of mass).
Write “not balanced” next to those equations that do no demonstrate conservation of mass.

12. 2Cu + O2 ---------------- > 2 CuO

13. Cu + AgNO3 ------------ > Cu(NO3)2 + 2Ag

14. P4 + Cl2 ----------------- > 4PCl3
Need help? Study Book pg 113 Set 25 - 26
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15. 2Ag + H2S --------------- > Ag2S + H2

16. 8Al + 3Fe3O4 --------------- > 4Al2O3 + 9Fe

17. 4Fe(s) + 3O2 (g) ------------ > Fe2O3(s)

18. C3H8 + 3O2 ------------- > 3CO2 + 4H2O

Set D: Balancing equation Objective: To test your ability to balance equations
Balance each equation below using the smallest whole number coefficients. Indicate the sum of all
coefficients in the box after you had balanced each equation.
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19. Cu2S ---------------------------- > Cu + S

20. Hg + O2 --------------- > HgO

21. FeCl2 + Na2CO3 ----------- > FeCO3 + NaCl

22. AgNO3 + MgCl2 ----------- > Mg(NO3)2 + AgCl Need help? Study Book pg 115 - 117 Set 29 - 31

23. C3H6 + O2 ------------ > CO2 + H2O

24. C8H16 + O2 --------------- > CO2 + H2O

25. C2H4O2 + PCl3 --------------- > C2H3OCl + H3PO3
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