Question

section #4: mixtures & separating mixtures (s) - solid, (l) - liquid, (g) - gas, (aq) - aqueous solution

1. a homogeneous mixture is also known as a
2. what separation technique would most likely be used to separate sand and water?
3. what physical property is used in the process of distillation?

a. melting point b. boiling point c. heat of fusion d. heat of vaporization

1. a compound differs from a mixture in that a compound always has

a. a maximum of two components. c. a definite composition.
b. a heterogeneous composition. d. at least three components

1. which of the following is a homogeneous mixture?

a. na(s) b. h₂o(l) c. cl₂(g) d. nacl(aq)

1. which of the following substances is a mixture?

a. air b. water c. methane d. potassium

1. which of the following terms is a term that could refer to heterogeneous matter?

a. element b. mixture c. compound d. solution

1. which particle diagram below represents a mixture of element a and element b? element a - o element b - ●
2. salt is dissolved in water. this combination would best be described as a

a. homogeneous compound c. heterogeneous compound
b. homogeneous mixture d. heterogeneous mixture

1. stainless steel contains up to 90% iron, at least 10.5% chromium, around 1.2% carbon, and other trace elements such as silicon, manganese, and molybdenum. because these percentages can vary, steel is classified as a

a. element b. compound c. substance d. mixture

Explanation:

1. A homogeneous mixture is also called a solution as it has uniform composition throughout.
2. Filtration is used to separate an insoluble solid (sand) from a liquid (water) as sand particles are too large to pass through filter paper while water can.
3. Distillation uses the difference in boiling points of substances in a mixture to separate them.
4. A compound has a definite chemical composition, unlike a mixture which has variable composition.
5. An aqueous solution of sodium - chloride (NaCl(aq)) is a homogeneous mixture as the salt is uniformly dissolved in water.
6. Air is a mixture of different gases like nitrogen, oxygen, carbon - dioxide etc.
7. A mixture can be heterogeneous, having a non - uniform composition.
8. The particle diagram with different types of uncombined atoms (circles and dots) represents a mixture of elements A and B.
9. Salt dissolved in water is a homogeneous mixture as the salt is uniformly distributed in the water.
10. Stainless steel is a mixture because the percentages of its components can vary.

Answer:

1. solution
2. filtration
3. b. boiling point
4. c. a definite composition
5. d. NaCl(aq)
6. a. air
7. b. mixture
8. (Particle diagram with uncombined A and B atoms)
9. b. homogeneous mixture
10. d. mixture