Question

Give one example each where the chemical equation is accompanied by
a) change in state B) change in colour C) evolution of gas
D) change of temperature E) formation of precipitate

Chemical equation not chemical reaction

Answer 1

Answer:

Change in colour - decomposition of silver chloride.

Evolution of gas - reaction of copper with sulfuric acid.

Change in temperature - heating of water molecules in 100 degree and so on.

Formation of precipitate reaction......

Changes of state - decomposition of ferrous sulphate .

Answer 2

Examples of Chemical Equation

Explanation:

a). Change in state:  When wax is burnt in the form of wax candle then Water and carbon dioxide are formed. Wax is a solid water is a liquid whereas carbon dioxide gas

b). Change in colour:  Reaction between lead nitrate solution and potassium iodide solution

Pb($NO_{3}$)2(aq) +2KI -------> $Pbl_{2}$(s) + $2KNO_{3}$ (aq)  In this reaction colour changes from colorless to yellow

c). Evolution of gas:  The chemical reaction between zinc and dilute sulphuric acid is characterized by the evolution of hydrogen gas.

d). Change in temperature change in temperature:  Action of dilute sulphuric acid on zinc  

Zn(s) + $H_{2}SO_{4}$ (aq) -->$ZNSO_{4}$ (aq) + $H_{2}$ (g) . In this reaction heat is evolved

e). Formation of precipitate:  Action of Barium Chloride on sodium sulphate.