Unit Test Review #1
A solution contains 90 mL of methanol, 18 mL of propanol, and 2 mL of diethyl ether. Which is the solvent in this solution? A. methanol B. propanol C. diethyl ether D. water
A.
Which is an example of a nonaqueous solution? A. gasoline B. fog C. mayonnaise D. fruit juice
A.
Which statement describes a chemical property of water? A. It reacts with sodium metal. B. It has a melting point of 0°C. C. It has a density of about 1 g/mL. D. It is clear and colorless.
A.
Which statement describes heterogeneous mixtures? A. They are made up of two or more pure substances that are not chemically bonded together. B. They appear uniform, like a pure substance. C. They have fixed ratios between their components. D. They are made up of two or more pure substances that can be separated only by chemical processes.
A.
Which factor influences both solubility and the rate of dissolution? A. pressure B. temperature C. particle size D. nature of solvent
B.
Which of these is an example of a physical change? A. sugar, when heated, producing carbon dioxide and water B. solid ice, when heated, turning into liquid water C. sodium, when exposed to chlorine, forming sodium chloride D. aluminum, when heated in air, forming aluminum oxide
B.
Which statement accurately describes part of the dissolving process of a polar solute in water? A. Solute molecules repel water molecules. B. Water molecules surround solute molecules. C. Water molecules are strongly attracted to nonpolar substances. D. Solute molecules remain concentrated in one part of the solvent.
B.
When a strip of magnesium metal is touched to a flame, a bright light and a whitish substance are produced. Why is the burning of magnesium considered a chemical change? A. because the metal reaches a high temperature B. because the metal begins to melt C. because a new substance is formed D. because the metal is malleable
C.
Which of the following observations would indicate that a material is a pure substance? A. It does not dissolve in water. B. It changes color after heating. C. It cannot be physically broken down into different types of atoms. D. It can be physically broken down into different types of molecules.
C.
Which statement describes an extensive property of matter? A. It changes with the color of a substance. B. It changes when a new substance is formed. C. It changes with the amount of sample that is present. D. It changes with the composition of a substance.
C.
A can of soda contains many ingredients, including vanilla, caffeine, sugar, and water. Which ingredient is the solvent? A. caffeine B. sugar C. vanilla D. water
D.
A piece of sodium metal can be described as A. a pure substance and a compound. B. an impure substance that is reactive. C. an impure substance that is unreactive. D. a pure substance and an element.
D.
The graph below shows how solubility changes with temperature. http://media.edgenuity.com/evresources/3210-06-07/mc023-1.jpg How many grams of NaCl will be needed to form 600 mL of a saturated solution at 100°C? A. 15 g B. 24 g C.40 g D. 240 g
D.
Which of these factors will cause a solid solute to dissolve faster? A. increasing the air temperature B. increasing the amount of solute C. increasing the amount of solvent D. increasing the surface area of solute
D.
Which physical method can separate a mixture of steel ball bearings and marbles? A. boiling B. evaporation C. filtration D. sorting
D.