Q16 of 152 Page 18

Fill in the following blanks with suitable words:

(a) Chemical equations are balanced to satisfy the law of ........


(b) A solution made in water is known as an ............ solution and indicated by the symbol ..............

Chemical equation are balanced to Satisfy the law of conservation of mass.

(b) A solution made in water is known as an aqueous solution and indicated by the symbol (aq.).



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14 Write complete balanced equations for the following reactions:

(a) Calcium (solid) +Water (liquid) Calcium hydroxide (solution) +Hydrogen (gas)


(b) Sulphur dioxide (gas)+ Oxygen (gas)Sulphur trioxide (gas)

 15 Balance the following equations:

(i) Na + 02 Na20


(ii) H202H20 + 02


(iii) Mg(OH)2 +HCl MgCl2+ H20


(iv) Fe +02Fe203


(v) Al(OH)3Al203 + H20


(vi) NH3 + CuO Cu +N2+ H20


(vii) Al2(S04)3 + NaOH Al(OH)3 + Na2S04


(viii) HN03 +Ca(OH)2Ca(NO3)2 + H2O


(ix) NaOH+H2S04Na2SO4 +H2O


(x) BaCl2+H2S04 BaSO4+ HCl

 17 Give one example of a chemical reaction. 17 State two characteristics of the chemical reaction which takes place when dilute sulphuric acid is poured over zinc granules.