Question

megan wants to design an atomic model to represent a mixture. the image shows four different models where each type of foam ball represents an atom.
which model best represents a mixture?
model 1 represents a mixture because all atoms are identical and are not joined together.
model 2 represents a mixture because the atoms of two different elements are joined together.
model 3 represents a mixture because the atoms of two different elements are not joined together.
model 4 represents a mixture because all atoms are identical and are joined together.

Explanation:

A mixture consists of two or more different substances (elements or compounds) that are not chemically bonded.

• Model 1: Contains only identical individual atoms, which is a pure element, not a mixture.
• Model 2: Contains only identical molecules made of two different atoms, which is a pure compound, not a mixture.
• Model 3: Contains individual atoms of two different elements that are not bonded together, fitting the definition of a mixture.
• Model 4: Contains only identical molecules of the same element, which is a pure element (diatomic), not a mixture.

Answer:

C. Model 3 represents a mixture because the atoms of two different elements are not joined together.