Classify these mixtures as colloids, suspensions, or true solutions.

fog, milk of magnesia, mayonnaise, blood, table salt in water, dust-free air

I got fog, milk of magnesia, mayonnaise for colloids.
Blood for suspensions.
Table salt in water and dust-free air for true solutions.

It said I got it incorrect. Someone help me with this problem?

Certainly! Let's go through each mixture and classify them correctly:

1. Fog: Fog consists of tiny water droplets suspended in the air. These droplets are larger than individual molecules but smaller than the particles in a suspension. Therefore, fog is a colloid.

2. Milk of magnesia: Milk of magnesia is a mixture of solid magnesium hydroxide particles dispersed in water. The solid particles do not dissolve but remain suspended in the liquid. This is also a colloid.

3. Mayonnaise: Mayonnaise is an emulsion of oil droplets dispersed in water, stabilized by the presence of an emulsifying agent. Emulsions like mayonnaise are colloids.

4. Blood: Blood contains various components such as red and white blood cells, platelets, and proteins suspended in a liquid called plasma. The particles in blood are much larger and can settle with time, making blood a suspension.

5. Table salt in water: When table salt (sodium chloride) dissolves in water, the salt particles dissociate into individual ions and become uniformly dispersed throughout the water. This forms a true solution.

6. Dust-free air: Air is a mixture of various gases, primarily nitrogen, oxygen, carbon dioxide, and trace amounts of other gases. As long as there are no visible dust particles present, air can be considered a true solution.

So, your classification is correct for the fog, milk of magnesia, and mayonnaise as colloids. However, blood is a suspension, not a colloid. And you are correct that table salt in water and dust-free air are classified as true solutions.

Based on your classification, you have correctly identified fog, milk of magnesia, and mayonnaise as colloids. These mixtures consist of small particles dispersed in a medium, giving them a cloudy or opaque appearance.

However, blood is not classified as a suspension. Blood is actually considered a colloidal mixture due to its composition of various cells and proteins dispersed in plasma.

Table salt dissolved in water is indeed a true solution. The salt particles mix uniformly with the water molecules on a molecular level, resulting in a clear and homogeneous solution.

Dust-free air, on the other hand, is not a true solution. It is actually a mixture of gases, mainly nitrogen, oxygen, carbon dioxide, and other trace gases. Despite being uniform, it is not considered a true solution because it does not involve the dissolution of one substance into another.

So, to summarize:

Colloids:
- Fog
- Milk of magnesia
- Mayonnaise
- Blood

True Solutions:
- Table salt in water

Other:
- Dust-free air (not a true solution)

Can someone help me?