Question

1. which container(s) represents an element?
2. which container(s) represents a mixture of two elements?
3. which container(s) represents a mixture?
4. which container(s) represents a compound?
5. which container(s) represents a mixture of two different compounds?
6. which container(s) represents a physical change?

Explanation:

• An element is a pure substance made of only one type of atom. Container C has only one - type of molecule (all the same circles), representing an element.
• A mixture of two elements consists of two different types of pure - substance atoms. Container A has two different types of atoms (circles and filled circles) not combined chemically.
• A mixture can be a combination of elements and/or compounds. Containers A, B, D, F are mixtures as they have different types of particles not chemically bonded.
• A compound is a pure substance made of two or more different types of atoms chemically bonded. Container D has molecules where different atoms are bonded together.
• A mixture of two different compounds has two types of chemically - bonded combinations. Container B has two different types of compounds.
• A physical change involves a change in the state or appearance of a substance without changing its chemical composition. None of the containers clearly show a physical change based on the particle models shown.

Answer:

1. C
2. A
3. A, B, D, F
4. D
5. B
6. None of the above shown