Final answer:
The correct answer are options A,B and C. Air and carbon dioxide in water are both solutions as they are homogeneous mixtures where the composition is uniform throughout. A brass buckle is a homogeneous solid solution. A blueberry muffin is a heterogeneous mixture since it contains visibly distinct components.
Step-by-step explanation:
When discussing which mixtures are solutions, it's important to understand that solutions are a type of homogeneous mixture where one substance is fully dissolved in another and the mixture is uniform throughout. So, let's examine the provided examples:
- Air: Air is a solution, as it is a homogeneous mix of nitrogen, oxygen, carbon dioxide, and other gases.
- Carbon dioxide and water mixture: This can be considered a solution too, as carbon dioxide can dissolve in water, forming a homogeneous mixture, much like salt dissolves in water.
- Brass buckle: Brass is a solid solution (alloy) of copper and zinc, which is also known as a homogeneous mixture.
- Blueberry muffin: A blueberry muffin is a heterogeneous mixture because it has distinct parts, like blueberries and dough, which you can see individually.
Based on the examples provided, air and carbon dioxide dissolved in water are examples of solutions. A brass buckle, while a homogeneous mixture, is a solid solution and thus a bit different from the typical liquid solution we often think about. Lastly, a blueberry muffin is not a solution.