Question

(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

Answer:

(a) (1) change in colour

(ii) change in temperature

determine chemical reaction

(b) burning of natural gas is displacement reaction

Answer 2

(a) The observations to establish whether or not the chemical reaction has occurred are as follows:

• Variation in colour
• Gaseous evolution
• Temperature fluctuation
• Precipitation formation
• pH Variation

(b) It is a combination reaction. Methane is the primary component of natural gas, a common fuel source.

When natural gas burns, a high-temperature blue flame is produced and complete combustion takes place. Methane is CH4 and when burnt in oxygen (air) it produces heat and CO2 and water.

The balanced reaction is

CH4 + 2O2 → CO2 + 2H2O.