When sugar is dissolved in water, sugar is the ______, water is the ______ and sweet water is ______ respectively.

In the context of a solution where sugar is dissolved in water, the terms used to describe the components are as follows:

Sugar is the solute: A solute is a substance that is dissolved in a solvent to form a solution. In this case, sugar (sucrose) is the substance being dissolved.

Water is the solvent: A solvent is the substance that does the dissolving. Water is the most common solvent in nature and is often referred to as the "universal solvent" because it can dissolve many substances.

Sweet water is the solution: A solution is a homogeneous mixture formed when a solute is dissolved in a solvent. In this case, the resulting mixture of sugar and water is a sweet solution.

So the complete answer would be:

When sugar is dissolved in water, sugar is the solute, water is the solvent, and sweet water is the solution.