9) Which ingredients form a solution when combined? \( \begin{array}{llll}\text { a) Ice and water } & \text { b) Sand and water } & \text { c) Oil and water } & \text { d) Lime juice and water }\end{array} \)

To determine which ingredients form a solution when combined, we need to understand what a solution is. A solution is a homogeneous mixture where one substance (the solute) is dissolved in another (the solvent). Let's analyze each option: a) **Ice and water**: When ice is added to water, it melts and becomes part of the water, forming a homogeneous mixture. Thus, this combination can be considered a solution. b) **Sand and water**: When sand is added to water, it does not dissolve; instead, it settles at the bottom or remains suspended. This combination does not form a solution. c) **Oil and water**: Oil and water do not mix; they separate into two distinct layers. Therefore, this combination does not form a solution. d) **Lime juice and water**: Lime juice is acidic and dissolves in water, creating a homogeneous mixture. This combination forms a solution. Based on this analysis, the combinations that form a solution are: - a) Ice and water - d) Lime juice and water Thus, the correct answers are **a) Ice and water** and **d) Lime juice and water**.