equations writing ws 3
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Name: ___________________________ ( ) Class:_______Date: ________
Answer the following questions: 1. Which equation is balanced?
A Zn + O2 ZnO C Mg + Cl2 MgCl2
B CO2 + C CO D H2 + O2 H2O ( )
2. How should the following reaction be written as a balanced symbol equation ?
carbon + carbon dioxide carbon monoxide
A C + CO2 2CO C 2C + CO2 2COB C + CO2 C2O2 D 2C + CO 2CO2 ( )
3. Propane, C3H8, burns as shown.C3H8 + …..O2 3CO2 + 4H2OWhich number of oxygen molecules balances the equation above?A 4 B 5 C 7 D 10 ( )
4. What is the correct balanced chemical equation for the reaction between calcium and water?A Ca + H2O CaOH + H2 C Ca + 2H2O CaOH + H2
B C + CO2 C2O2 D Ca + 2H2O Ca(OH)2 + H2 ( )
5. The equation for the complete combustion of the hydrocarbon CxHy is shown.CxHy + 6O2 4CO2 + 4H2OWhat are the values of X and Y?
X YA 1 4B 2 2C 4 4D 4 8
( )6. Sulphur dioxide and oxygen react together to form sulphur trioxide.
xSO2 + yO2 zSO3
What values for x, y and z balance the equation?X Y Z
A 1 1 2B 1 2 2C 2 1 2D 2 2 1
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Prepared by Lin XJ 1
Secondary 3 NA Science (Chemistry)Chapter 7: Writing EquationsWorksheet 3
7. Write the (i) word equations and (ii) balanced chemical equations, including the state symbols, for the following reactions.
(a) Magnesium metal burning in oxygen to produce solid magnesium oxide.
Word equation: ______________________________________________________________
Chemical equation: __________________________________________________________
(b) Zinc metal reacting with sulphuric acid (H2SO4) to produce a solution of zinc sulphate and hydrogen.
Word equation: ______________________________________________________________
Chemical equation: __________________________________________________________
(c) Copper (II) carbonate reacts with hydrochloric acid to produce copper (II) chloride, carbon dioxide and water. Write a balanced chemical equation for this reaction.
Word equation: ______________________________________________________________
Chemical equation: __________________________________________________________
(d) Lead (II) nitrate breaks down into lead (II) oxide, nitrogen dioxide and oxygen.
Word equation: ______________________________________________________________
Chemical equation: __________________________________________________________
(e) Combustion of propane (C3H8) with oxygen to yield carbon dioxide and water only.
Word equation: ______________________________________________________________
Chemical equation: __________________________________________________________
8. Write a balanced equation, including state symbols, for the following reactions.(a) hydrogen gas + nitrogen gas ammonia gas
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(b) magnesium + sulphuric acid magnesium sulphate solution + hydrogen gas
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(c) zinc carbonate + nitric acid zinc nitrate + water + carbon dioxide
Prepared by Lin XJ 2
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Prepared by Lin XJ 3