Which of the following are solutions? Choose all that apply. (Note: do not pick heterogeneous systems that contain a homogeneous phase.)
- Cold coffee or cold tea.
-Cigarette smoke.
- Tap water.
- Milk.
- Fog.
- The air typically found in a room.
- Pure water.
solutions are transparent, homogenous, uniformly mixed.
I see only three listed that are solutions.
To determine which of the given substances are solutions, we need to understand what constitutes a solution and differentiate it from other substances.
A solution is a homogeneous mixture consisting of two or more substances. In a solution, the solute is uniformly dispersed within the solvent, resulting in a single phase with uniform properties throughout. On the other hand, heterogeneous systems may contain different phases that are visually distinguishable.
Now, let's analyze the options provided:
- Cold coffee or cold tea: These beverages typically contain dissolved solutes (such as sugar or coffee/tea compounds) in a liquid solvent (water). Since the solute is uniformly dispersed within the liquid, cold coffee or cold tea can be considered solutions.
- Cigarette smoke: Cigarette smoke is not a solution. It is a heterogeneous mixture of various gases, particles, and aerosols suspended in the air.
- Tap water: Tap water is commonly a solution. It contains dissolved substances (such as minerals and gases) in water as a solvent. However, it's worth mentioning that tap water can also contain suspended particles or colloids in some cases.
- Milk: Milk is a colloidal suspension, not a solution. It contains microscopic fat globules and protein particles dispersed in water.
- Fog: Fog is not a solution either. It is a type of cloud that forms near the ground when moisture condenses into tiny water droplets or ice crystals. These droplets or crystals are suspended in the air, making it a heterogeneous mixture.
- The air typically found in a room: The air in a room is a mixture of gases (such as nitrogen, oxygen, carbon dioxide, and trace amounts of other gases). It is not a solution but a homogeneous mixture of gases.
- Pure water: Pure water, devoid of any dissolved substances, is considered a solution as it only contains the solvent (water) itself.
So, the solutions among the given options are:
- Cold coffee or cold tea.
- Tap water.
- The air typically found in a room.
- Pure water.