Let me carefully examine the six diagrams (A–F) to determine which one(s) represent a
compound, based on the instruction: *"A compound is not a mixture."*
First, recall what a compound is:
- A compound is a substance made of
two or more different types of atoms chemically bonded together in a fixed ratio.
- In particle diagrams, this means we see
identical molecules, each made of
different kinds of atoms joined together (e.g., one black and one white atom always paired).
- A
mixture would show either:
- Different types of particles (e.g., some single atoms, some molecules), or
- More than one kind of molecule (e.g., some AB molecules and some CD molecules), or
- Unbonded atoms of different elements mixed together.
Now let’s analyze each diagram:
Diagram A: Contains only two types of *separate* atoms — black circles and white circles — all unconnected. This is a
mixture of two elements, not a compound.
Diagram B: Shows only one type of molecule: each consists of
one white circle and one black circle bonded together. All particles are identical.
✔ This fits the definition of a
compound.
Diagram C: Shows molecules, but each molecule has
one white circle + one dotted circle — all identical. So this is also a compound (different atoms, same arrangement).
✔
Wait — hold on. The question likely expects *one* correct answer, so I need to double-check if the problem asks for “which one is a compound?” or maybe “which ones are compounds?” But since it says “answer the questions overleaf” and only shows diagrams, and typical KS3 worksheets ask to pick *the* compound, I should verify if any diagram shows *only* one type of compound molecule.
Let me zoom in on C and B to confirm.
Parent Tip: Review the logic above to help your child master the concept of atomic compounds worksheet.
