Identify the mixtures in Fig 4.28 and the states of matter combined to make them.

Here's how to solve the activity:

1. Decide what the mixtures in Fig 4.28 are.

• a) The mixture shown is smoke, typically from a fire.
• b) The items shown are disposable cups and plates. Given the context of "solid-gas mixtures," these are likely made of a porous solid material (such as foam plastic or paper) that contains trapped gas.

2. Decide what states of matter were combined to make them.

• a) Smoke: This mixture is formed by combining solid particles (like soot and ash) with gases (such as air and combustion gases).
• b) Porous solid material (cups/plates): This mixture is formed by combining a solid matrix (e.g., plastic or cellulose fibers) with gas (air) trapped within its structure.

Here are the answers:

1. a) The mixture is smoke. b) The mixture is a porous solid material (e.g., foam or paper).
2. a) The states of matter combined are solid and gas. b) The states of matter combined are solid and gas.