Question

1. homogeneous mixtures are

a) evenly distributed b) not evenly distributed

1. heterogeneous mixtures are

a) evenly distributed b) not evenly distributed

1. an aqueous solution is a

a) homogeneous mixture b) heterogeneous mixture

1. which of the following two is a solution?

a) salt water c) chocolate chip cookie
b) granite rock d) sugar solution

1. when a teaspoon of sugar is added to water in a beaker, the sugar dissolves. the

resulting mixture is
a) a compound c) a heterogeneous mixture
b) a homogeneous mixture d) an emulsion

1. a solution is a

a) heterogeneous mixture c) both hetero. or homogeneous mixture
b) homogeneous mixture d) neither hetero. or homogeneous mixture

1. a solution

a) will separate on standing c) can be cloudy
b) may have color d) can be heterogeneous

1. when a mixture of sand and salt water is filtered, what substances will pass through

the filter paper?
a) salt and water c) sand and water
b) only salt d) only sand

1. distillation can be used to separate

a) gases with different densities c) solids suspended in a gas
b) two miscible liquids with different boiling points d) two solids

1. if a student pours a mixture of sand and salt water on to a filter paper in a funnel,

then what will be found remaining in the filter paper in the filter funnel (the residue)?
a) salt only c) salt and water
b) sand only d) salt and sand

Explanation:

1. Homogeneous mixtures have uniform composition, so they are evenly distributed.
2. Heterogeneous mixtures have non - uniform composition, so they are not evenly distributed.
3. An aqueous solution is a homogeneous mixture (e.g., salt dissolved in water forms a uniform mixture).
4. Salt water and sugar solution are solutions (homogeneous mixtures). Granite rock is a heterogeneous mixture (different minerals), chocolate chip cookie is also heterogeneous.
5. When sugar dissolves in water, it forms a homogeneous mixture (uniform composition throughout).
6. A solution is a homogeneous mixture (by definition).
7. A solution may have color (e.g., copper sulfate solution is blue). It will not separate on standing (it is stable), is not cloudy (homogeneous), and is not heterogeneous.
8. Salt water is a homogeneous mixture (salt dissolved in water). Sand is a solid that will be retained by the filter paper. So salt and water (the solution) pass through.
9. Distillation is used to separate two miscible liquids with different boiling points (e.g., ethanol and water).
10. Sand is a solid that will be retained (residue) on the filter paper. Salt water (the solution) will pass through.

Answer:

1. a) evenly distributed
2. b) NOT evenly distributed
3. a) homogeneous mixture
4. a) salt water, d) sugar solution
5. b) a homogeneous mixture
6. b) homogeneous mixture
7. b) may have color
8. a) salt and water
9. b) two miscible liquids with different boiling points
10. b) sand only