Question

section 2.2 mixtures

1. how might one separate a mixture of water and salt?
2. what is a homogeneous mixture?
3. which of the following mixtures are homogeneous? which are heterogeneous?

a. gasoline
b. chunky peanut butter
c. oil and vinegar salad dressing
d. orange soda

Explanation:

Question 1

To separate a mixture of water and salt, we can use evaporation. Salt (sodium chloride) has a much higher boiling point than water. By heating the mixture, the water will evaporate (turn into vapor) and leave the salt behind. Alternatively, we can use distillation, where the water vapor is collected and condensed back into liquid water, separating it from the salt.

A homogeneous mixture is a type of mixture in which the composition is uniform throughout the mixture. This means that the different components are evenly distributed at a molecular or microscopic level, and we cannot visually distinguish the individual components. Examples include saltwater, air, and sugar dissolved in water. The mixture has the same properties and appearance in any part of it that we sample.

Gasoline is a mixture of various hydrocarbons and additives. The components are evenly mixed at a molecular level, and we cannot see distinct parts. So it is homogeneous.

Answer:

One can separate a mixture of water and salt by evaporation (heating the mixture to vaporize the water, leaving salt behind) or distillation (collecting and condensing the water vapor to separate it from the salt).

Question 2