In chemical terms, the sugar added to tea to make it sweet is a disaccharide called sucrose.

Here's a breakdown:

* Disaccharide: This means it's made up of two simpler sugar units (monosaccharides) linked together.

* Sucrose: This is the specific type of disaccharide found in table sugar. It's composed of one glucose molecule and one fructose molecule joined together.

When you add sugar to tea, the sucrose dissolves in the hot water, making the tea taste sweet. The sweetness comes from the interaction of the sugar molecules with your taste buds.