The part of the cell that has a jelly-like substance around the nucleus where most chemical reactions happen is called the cytoplasm.

Here's a breakdown:

* Cytoplasm: This is the gel-like substance that fills the cell and surrounds the nucleus. It's composed mostly of water, but it also contains dissolved nutrients, salts, and proteins.

* Nucleus: This is the control center of the cell, containing the cell's genetic material (DNA).

* Chemical Reactions: Many essential chemical reactions occur within the cytoplasm, including:

* Metabolic processes: Breaking down nutrients for energy and building new molecules.

* Protein synthesis: Creating proteins based on instructions from DNA.

* Cell signaling: Receiving and transmitting messages from other cells.

So, the cytoplasm is a busy and essential part of the cell, providing the environment where many vital chemical reactions take place.