Question

1. what is the term for the lumps that form when an acid is added to milk?

colloid
suspension
precipitate
gas

Explanation:

When an acid is added to milk, the pH changes. Milk contains casein proteins. In acidic conditions, these proteins denature and clump together. A precipitate is an insoluble solid that forms from a liquid solution. Colloids have particles that do not settle out easily (like milk itself before acid addition). A suspension has larger particles that can settle but the lumps here are due to chemical - protein interaction (precipitation). Gas is a state of matter and not relevant here.

Answer:

precipitate