New York Science Grade 7

Chapter 11: Substances, Mixtures, and Solubility

Substances, Mixtures, and Solubility

1
Which of the following is a compound?
A)brass
B)water
C)air
D)blood
2
As the temperature of a liquid solvent increases, the amount of solute that can dissolve in it __________.
A)decreases by one degree Celsius for every milliliter of solvent
B)increases
C)decreases
D)remains constant
3
Which of the following is a solution?
A)salt water
B)chlorine
C)milk
D)muddy water
4
A mixture in which the substances are not mixed evenly is called __________.
A)heterogeneous
B)a solution
C)precipitated
D)homogeneous
5
__________ are substances that can accept positively charged H+ ions.
A)Solutes
B)Bases
C)Acids
D)Hydroniums
6
A solid solute that comes back out of solution is called a(n) _________ .
A)solvent
B)suspension
C)aqueous
D)precipitate
7
A(n) __________ is the substance being dissolved in a solution.
A)solute
B)solvent
C)substrate
D)insolvent
8
A solution that contains all the solute it can hold at a given temperature is __________.
A)supersaturated
B)soluble
C)saturated
D)unsaturated
9
Matter that has fixed composition is a __________.
A)solid
B)solution
C)substance
D)mixture
10
Which of the following statements is true?
A)Nonpolar solvents are useful for dissolving polar solutes.
B)Nonpolar solvents are useful for dissolving nonpolar solutes.
C)Nonpolar solvents are not useful because they do not form solutions with water.
D)Polar solvents are useful for dissolving nonpolar solutes.
11
__________ compounds are formed from atoms covalently bonded.
A)Molecular
B)Elemental
C)Ionic
D)Heterogeneous
12
The process for separating air is called __________ .
A)homogenization
B)precipitation
C)fractionation
D)emulsification
13
__________ are substances that release positively charged hydrogen ions, H+.
A)Solutes
B)Bases
C)Acids
D)Solvents
14
A solution in which water is the solvent is called a(n) __________ solution.
A)saturated
B)aqueous
C)nonpolar
D)heterogeneous
15
Sterling silver contains 92.5 percent silver and 7.5 percent copper. Which substance is the solute?
A)platinum
B)silver
C)copper
D)Solids do not form solutions.
16
Stir 500 g of cesium chloride into 200 g of water at 20°C. If 127 g sink to the bottom of the container, what is the solubility of cesium chloride in water at 20°C?
A)127
B)373
C)286.5
D)186.5
17
__________ is the interaction that occurs between acids and bases in which the properties of each are canceled out by the other.
A)Neutralization
B)Indication
C)Dissolution
D)Balancing
18
Air contains 78 percent nitrogen, 21 percent oxygen, and one percent argon. Which gas is the solvent?
A)oxygen
B)argon
C)nitrogen
D)none of the above
19
__________ are combinations of substances that can be separated by physical processes.
A)Compounds
B)Elements
C)Atoms
D)Mixtures
20
A(n) __________ is made of two or more elements chemically combined in fixed ratios.
A)mixture
B)compound
C)atom
D)solution
21
A solution having which of the following pH values is the most acidic?
A)14
B)5
C)1
D)7
22
__________ is the maximum amount of a solute that can be dissolved in a given amount of solvent at a given temperature.
A)Supersaturation
B)Concentration
C)Solubility
D)Polarity
23
A mixture that appears to have the same composition, color, and density and is mixed at the molecular level is called a(n) __________.
A)suspension
B)element
C)solution
D)heterogeneous mixture
24
Which of the following is formed when atoms of different elements exchange electrons?
A)polar solvents
B)nonpolar compounds
C)molecular compounds
D)ionic compounds
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