Question

State what type of the reaction the following are:

i. Action of heat on calcium carbonate

ii. Treating AgNO3 with hydrochloric acid


b. Write the balanced chemical equation for the word equation ;

Iron + Water  Ferric oxide + Hydrogen

c. Burning of a candle may be considered as showing physical and

chemical change. Justify the statement.​

Answer 1

(I)CaCO3 -----∆--> CaO+ CO2, (ii) AgNO3+HCl------> AgCl+ HNO3,. (b). 2[Fe]+ 3[H2O] ------> Fe2O3 +3[H2] , (c). burning of candle showing both physical and chemical change because wax of candle melt and after some time we collect the wax but burning of thread in candle after burning it convert into ash so it's chemical as well as physical change