Steps 1-5 to lighting a Bunsen burner

1.first connect the Bunsen burner to a rubber tube which is fixed with the gas sources

2.close the air hole of a Bunsen burner

3.allow plenty of gases to enter the Bunsen burner

4.light the Bunsen burner at the top of the chimney

5.adjust the air hole by opening untill you get a non luminous flame adjust the gas tap to obtain enough gases

the leaf is an organ of a typical plant, and the main functions are to complete photosynthesis and allow the plant to exchange gas, just like how we have the respiratory system. leaves have the stomata, which collects maintains co2 and o2 levels. this is necessary for cell metabolism. the leaf also collects sunlight using chloroplasts. succinctly, leaves own a pivotal role in sustaining plant life.

answer: enthalpy

explanation:

for a exothermic reaction, the energy is released i.e. the energy of the products is lower than the energy of the reactants.

= enthaply

= energy of products

= energy of reactants

as , thus comes out to be negative. negative value of enthalpy shows that the reaction is exothermic.