Question

as the bright sun shines upon the water, the water slowly disappears . the same sunlight gives energy to the surrounding plants to convert water and carbon dioxide into sugar and oxygen gas which change is physical and which is chemical

Answer 1

The disappearance of water due to sunlight is a physical change, while the conversion of water and carbon dioxide into sugar and oxygen by plants, powered by sunlight, is a chemical change known as photosynthesis.

Step-by-step explanation:

When the sunlight shines upon water, causing it to disappear, this is a physical change known as evaporation; the water changes from a liquid to a gas without undergoing a change in its chemical composition.

In contrast, the same sunlight provides energy to the surrounding plants to convert water and carbon dioxide into sugar and oxygen gas, a chemical change known as photosynthesis. During photosynthesis, plants use the radiant energy from sunlight to drive a chemical reaction that produces glucose, a sugar that acts as food for the plant, and oxygen gas, a byproduct necessary for animal life.

This complex transformation is critical for life on Earth, as it involves capturing and storing chemical energy in glucose's stable covalent bonds, a form of energy that living organisms use to fuel their metabolism.

Answer 2

As the bright sun shines upon the water, the water slowly dissapears. This is an example of physical change because here the water is just transformed into water vapour. So only the state and the shape of the substance has changed. Its originality remains absolutely intact. In the second case where the same sunlight gives energy to the surrounding plants to convert water and carbon dioxide into sugar and oxygen gas, it is a chemical change. here new substances are formed and the identity of the original substances are lost.In chemical reactions, the mass of the product will always be the same as the mass of the reactants.