Question

1. what does the following diagram best represent? \bigcirc = mercury atom, container of mercury, magnified millions of times. options: a. phase change, b. substance, c. chemical reaction, d. mixture

Explanation:

The diagram shows mercury (a single type of atom, mercury atoms) in a container. A substance is matter with a uniform and definite composition (here, only mercury atoms). Option A: No phase change is shown (no change in state like solid - liquid - gas transition). Option C: No chemical reaction (no new substances formed, just mercury atoms). Option D: Not a mixture (mixtures have two or more substances, here only mercury). So the diagram represents a substance.

Answer:

B. substance