Question

elements, compounds, and mixtures
heather brown
types of matter: elements, compounds, and mixtures
2h₂ + o₂ → 2h₂o
multiple - choice question
...new bonds...new substance...
biology has occurred.
chemistry has occurred.
astrology has occurred.
astronomy has occurred.
rewatch skip

Explanation:

The reaction \(2H_2 + O_2 \to 2H_2O\) involves the formation of new bonds (between hydrogen and oxygen atoms) to create a new substance (\(H_2O\)). This is characteristic of a chemical reaction, which falls under the domain of Chemistry. Biology deals with living organisms, astrology is a pseudoscience related to celestial bodies' influence on human affairs (not a scientific discipline in the context of this reaction), and astronomy focuses on celestial objects and phenomena.

Answer:

B. Chemistry has occurred.