Could you help me with 3 Chemistry problems?

Question

1. Identify the following as a suspension or a colloid.

marshmallow

B) suspension

C) colloid

2. Select all that apply.

Which of the following are characteristics of heterogeneous mixtures?

-distinguishable components

-evenly distributed components

-particles too small to be seen with a microscope

-components in varying proportions

-particles that may settle

3. Select all that apply.

Which of the following are homogeneous solutions?

-salt water

-air

-sand and water

-vinegar

-cement

Answer 1

1. Marshmallows consist of air bubbles suspended in a matrix of gelatin and sugar.  This is a foam, and foam is a type of colloid.  Gelatin gels are also colloids.

2. Distinguishable components and particles that may settle (but don't have to) are characteristics of heterogeneous mixtures.

Small particles and evenly distributed components are characteristics of homogeneous mixtures, while the proportions of the components do not affect this distinction.

3.

Salt water - yes, it is a solution, the components are mixed completely and are indistinguishable in the solution.

Air - yes, it is composed of several gases that are mixed together.

Sand and water - no, sand does not dissolve in water, and will form macroscopic separate particles.

Vinegar - yes, it is a solution of acetic acid in water, with a few other chemicals.

Cement - no, you can see sand particles and other substances that are not completely mixed together.