Question

Examine the models below.

Which model represents a pure substance?

A. Model 1, because it represents compounds.

B. Model 2, because it represents several elements.

C. Model 3, because it represents one type of compound.

D. Model 4, because it contains both elements and compounds.

Answer 1

Answer: C

Step-by-step explanation:

Model 3 represents one type of compound.

Pure substances are a specific type of matter (e.g., water, helium).

• Made of one component and does not vary throughout the sample.
• Can be an element or a compound.