how to make chemical equations more informative? explain with example. (5marks)
Answers
Answer:
(a) The various ways in which a chemical equation can be made more informative are :
(i) By indicating the physical states of the reactants and products. Example: Gaseous state is indicated by the symbol (g).
Zn (s) + H2SO4 (aq) ZnSO4 (aq) + H2 (g)
(ii) By indicating the heat changes taking place in the reaction. For xxample: An exothermic reaction is indicated by writing "+Heat" or "+Heat energy" or "+Energy" on the products side of an equation.
C (s) + O2 (g) CO2 (g) + Heat
(iii) By indicating the "conditions" under which the reaction takes place.
Example: Delta stands for heat which is written over the arrow of the equation.
(b) Ca(OH)2 (aq) + CO2 (g) CaCO3 (s) + H2O (l)
Explanation:
(a) The various ways in which a chemical equation can be made more informative are :
(i) By indicating the physical states of the reactants and products. Example: Gaseous state is indicated by the symbol (g).
Zn (s) + H2SO4 (aq) ZnSO4 (aq) + H2 (g)
(ii) By indicating the heat changes taking place in the reaction. For xxample: An exothermic reaction is indicated by writing "+Heat" or "+Heat energy" or "+Energy" on the products side of an equation.
C (s) + O2 (g) CO2 (g) + Heat
(iii) By indicating the "conditions" under which the reaction takes place.
Example: Delta stands for heat which is written over the arrow of the equation.