Q9 of 152 Page 18

How will you indicate the following effects in a chemical equation?


(a) A solution made in water


 


(b) Exothermic reaction


 


(c) Endothermic reaction

(a) Solution made in water is denoted by aqueous symbol (aq).


(b) “+Heat” or “+Heat energy” or “+energy” on product side of chemical equation.


 


(c) “+Heat” or “+Heat energy” or “+energy” on reactants side of chemical equation.




More from this chapter

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7 What does the symbol (aq) represent in a chemical equation? 8 Why is photosynthesis considered an endothermic reaction? 10 Translate the following statements into chemical equations and then balance the equations :

(a) Hydrogen sulphide gas bums in air to give water and sulphur dioxide.


(b) Phosphorus bums in oxygen to give phosphorus pentoxide.


(c) Carbon disulphide bums in air to give carbon dioxide and sulphur dioxide.


(d) Aluminium metal replaces iron from ferric oxide, Fe203, giving aluminium oxide and iron.


(e) Bi:uiurn chloride reacts with zinc sulphate to give zinc chloride and barium sulphate.

 11 Write the balanced chemical equations for the following reactions:

(a) Calcium hydroxide + Carbon dioxide Calcium carbonate + Water


(b) Aluminium + Copper chloride Aluminium chloride + Copper