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GCSE Chemistry Notes: Answers to symbol equation questions

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FOR PRINTING OUT = Doc Brown's Chemistry KS4 science GCSE/IGCSE Practice Revision Questions

Chemical Equation Revision Practice

BALANCING SYMBOL EQUATION QUESTIONS - Part 2a Writing and Balancing Symbol Equation Questions

GCSE/IGCSE KS4 Science-Chemistry examination ('exam') practice questions for the symbol equations for the for the reactions of acids with metals, oxides, hydroxides and carbonates and hydrogencarbonates

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1a Word Equation Questions

1b Word Equation Question Answers

2b Symbol Equation Question Answers

Teach yourself to write equations!

GCSE/IGCSE Acids, Bases & Salts Notes

GCSE/IGCSE Multiple Choice BALANCING EQUATION QUIZ

GCSE/IGCSE KS4 Science-CHEMISTRY Revision Questions


Spelling note: sulphuric acid = sulfuric acid, sulphate = sulfate, aluminium = aluminum (US)


You must know four general word equations, all of which involve neutralisation (Foundation or Higher students) and higher students would be expected to write and interpret them as symbol equations too. (i) is also a redox reaction.

(i) metal + acid ==> a salt + hydrogen

(ii) basic oxide or hydroxide + acid ==> a salt + water

(iii) carbonate + acid ==> a salt + water + carbon dioxide

(iv) ammonia + acid ==> ammonium salt (note: no water formed, but ammonia (NH3) is an alkaline gas and soluble in water and neutralised by acids to form ammonium salts (NH4 ...)

The name of the salt depends on (i) the metal name, which becomes the first part of salt name, and (ii) the acid e.g. H2SO4 sulfuric acid makes a ... sulfate (...SO4), HCl hydrochloric acid makes a ... chloride (...Cl), HNO3 nitric acid makes a nitrate (...NO3) and CH3COOH ethanoic acid makes an ethanoate (...OOCCH3 or CH3COO..).

'SOME' FORMULA HELP: for MO, M = Mg, Ca, Cu, Zn ;  for MOH, M = Na, K ; for M(OH)2, M = Mg, Ca, Cu, Zn;

for MCO3, M = Cu, Zn, Ca, Mg ; for M2CO3 M = Na, K  ; and Al2O3, Al(OH)3, AlCl3, Al2(SO4)3, NH3, NH4

and for CH3COOM where M = Na, K and (CH3COO)2M where M = Mg, Ca, Cu, Zn.


SYMBOL EQUATION QUESTIONS (just write down Q number plus space answers and check)

(you might have to supply balancing numbers in the equations and try to get the state symbols correct too!)

1. Mg(s) +  __________________ ===> MgCl2(aq) + H2(g)

2. ZnO(s) + H2SO4(aq) ===>  __________________ + H2O(l)

3.  __________________ + 2HNO3(aq) ===> Ca(NO3)2(aq) + H2O(l)

4. CuCO3(s) + H2SO4(aq) ===>  __________________ + H2O(l) +  __________________

5.  __________________ + 2HCl(aq) ===> CaCl2(aq) + 2H2O(l)

6. Zn(s) +  __________________ ===> ZnSO4(aq) + H2(g)

7.  __________________ + HNO3(aq) ===> NH4NO3(aq)

8. CuO(s) + 2HCl(aq) ===>  __________________ + H2O(l)

9.  __________________ + 2HCl(aq) ===> MgCl2(aq) + H2O(l) +  __________________

10. Mg(OH)2(s) + H2SO4(aq) ===>  __________________ +  __________________

11. CuO(s) +  __________________ ===> Cu(NO3)2(aq) + H2O(l)

12. Zn(s) + 2HCl(aq) ===> ZnCl2(aq) + H2(g)

13.  __________________ + H2SO4(aq) ===> MgSO4(aq) + H2O(l)

14.  __________________ + H2SO4(aq) ===> MgSO4(aq) + H2O(l) + CO2(g)

15. Zn(OH)2(s) + 2HCl(aq) ===> ZnCl2(aq) +  __________________

16. Mg(s) + H2SO4(aq) ===>  __________________ +  __________________

17. ZnO(s) + 2HCl(aq) ===>  __________________ +  __________________

18. CuCO3(s) +  __________________ ===> CuCl2(aq) + H2O(l) +  __________________

19.  __________________ + H2SO4(aq) ===> CaSO4(aq) + 2H2O(l)

20. 2Al(s) +  __________________ ===> 2AlCl3(aq) +  __________________

21. CuO(s) +  __________________ ===> CuSO4(aq) + H2O(l)

22.  __________________ + H2SO4(aq) ===> ZnSO4(aq)+  __________________ + CO2(g) 

23. Mg(s) +  __________________ ===> Mg(NO3)2(aq) + H2(g)

24. __________________ +  __________________ ===> NaCl(aq) + H2O(l)

25.  _Al(s) +  __________________ ===> Al2(SO4)3(aq) +  3H2(g)

26. MgO(s) +  __________________ ===> MgCl2(aq) + H2O(l)

27. Na2CO3(aq) +  _HCl(aq) ===>  ______________ +  ____________ +  ______________

28.  __NaOH(aq) +  __________________ ===> Na2SO4(aq) +  __H2O(l)

29. Fe(s) +  __________________ ===> FeCl2(aq) +  __________________

30.  _______ + H2SO4(aq) ===> FeSO4(aq) + H2(g)

31. NH3(aq) + HNO3(aq) ===>  __________________

32. Na2CO3(aq) + H2SO4(aq) ===> Na2SO4(aq) +  __________________ +  __________________

33. Zn(OH)2(s) +  __HCl(aq) ===>  __________________ +  __H2O(l)

34. Mg(OH)2(s) + 2HCl(aq) ===> MgCl2(aq) +  __________________

35. ZnCO3(s) + 2HCl(aq) ===>  _______________+  _____________ +  __________

36. NaHCO3(s) + HCl(aq) ===>  ______________ +  _______________ +  _______________

37. NH3(aq) + HCl(aq) ===>  __________________

38.  __NH3(aq) +  __________________ ===> (NH4)2SO4(aq)

39.  _CH3COOH + Ca ===> (CH3COO)2Ca +  __

40. CaCO3 +  _ _______ ===> (CH3COO)2Ca +  ___ + CO2 

41. NaOH + CH3COOH ===>  ________ +  _____

42. Mg(OH)2 + 2CH3COOH ===>  _________ +  _  _____

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