Question

classify each of the following particulate level illustrations as a representation of either a pure substance or a mixture. use the references to access important values if needed for this question.

Explanation:

Step1: Recall definitions

A pure - substance consists of only one type of particle, while a mixture consists of two or more different types of particles.

Step2: Analyze top image

There are two types of diatomic molecules (blue - blue and red - red), so it is a mixture.

Step3: Analyze middle image

There are two types of molecules (a simple blue - white molecule and a more complex blue - white molecule), so it is a mixture.

Step4: Analyze bottom image

There is only one type of atom (light - blue atoms), so it is a pure substance.

Answer:

Top image: Mixture
Middle image: Mixture
Bottom image: Pure substance