Select all correct answers.

which of these processes are chemical reactions?

boiling an egg
crushing spices
vegetables rotting
chopping vegetables
dew forming

A. Bioling and egg

C. Vegetables rotting

Explanation:

For a chemical reaction, chemistry of the substrate is supposed to be changed that leads to the formation of prodcuts which are different from reactants. In the given examples, only two options satisfy this criteria which are boiling an egg and vegetable rotting.

Boiling an egg: In the boiling of an egg, the structure of protein changes due to heat, several chemical bonds (e.g. hydrogen bonds) break and new bonds form. The process is irreversible. This is why it can be considered as a chemical reaction.

Vegetable rotting: Vegetable rotting is a chemical process driven by microorganisms. It is also known as putrefaction. In this process, the compex organic compounds are broken down by microbes to release nutrients and energy for their growth and development. The speed of reaction depends on the turn over of the microbes. The lesser the turn over is, the faster would be the process of rotting.