Question

(35) Answer the following questions. (a) Write the main activities that help us to determine a chemical reaction (b) Which type of chemical reaction is burning of natural gas. Write its equations​

Answer 1

Explanation:

A) Following are the observations to determine whether the chemical reaction has taken place or not:

Change in colour.

Evolution of gas.

Change in temperature.

Formation of the precipitate.

Change in pH.

B)  By the burning of natural gas, heat is dissipated into the atmosphere. In a reaction, when heat energy is dissipated, instead of being absorbed, such reactions are termed as exothermic reactions. The burning of natural gas can be written in the eqn form as follows: CH4+2O2→CO2+2H2O