Question

what type of matter is formed when two or more elements are chemically combined?
a heterogeneous mixture
b homogeneous mixture
c pure substance
d a solution

Explanation:

When two or more elements are chemically combined, a compound is formed, which is a type of pure - substance. Mixtures (heterogeneous and homogeneous) are physical combinations of substances, and a solution is a type of homogeneous mixture.

Answer:

C. pure substance