Question

atoms combine to form different types of substances. some examples are shown below

which statement is supported by this diagram?

a c, and d are pure substances: b is a mixture

b c, and d are mixtures. a is a pure substance.

c and d are pure substances a and b are mixtures

c and d are mixtures, a and b are pure substances.

Explanation:

Step1: Recall the definitions

A pure substance has only one type of particle. A mixture has different types of particles.

Step2: Analyze each diagram

• Diagram A: All particles are the same (each particle has one black and two white spheres). So it is a pure substance (a compound).
• Diagram B: There are two different types of particles (one with a black sphere and one with a white sphere). So it is a mixture.
• Diagram C: All particles are atoms of the same element (black spheres). So it is a pure substance.
• Diagram D: All particles are molecules of the same element (two - black - sphere molecules). So it is a pure substance.

Answer:

A. C, and D are pure substances; B is a mixture