Which of the following will result in a chemical change
a. drying wood in the shed
b. burning coal in a furnace
c. melting ice to obtain water
d. evaporating alcohol into vapor

A chemical change is the change in which a new substance is formed.

Explanation:

A physical change occurs with a change in its physical state for example melting of solid ice to liquid water or condensation of water vapour to liquid water

So, Burning Coal in a furnace will be the answer as   is the new substance is produced.

All other process like drying, melting of ice ,evaporation of alcohol are examples of physical change as there is no new substance formed in it. We see only a change in the physical state of the substance.

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.

idk what the question is about