Indiana Science Grade 7

Chapter 10: Substances, Mixtures, & Solubility

Substances, Mixtures, and Solubility

1.
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
2.
A solution having which of the following pH values is the most acidic?
A)7
B)5
C)14
D)1
3.
__________ compounds are formed from atoms covalently bonded.
A)Ionic
B)Molecular
C)Heterogeneous
D)Elemental
4.
__________ is the interaction that occurs between acids and bases in which the properties of each are canceled out by the other.
A)Indication
B)Balancing
C)Dissolution
D)Neutralization
5.
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)remains constant
D)decreases
6.
The process for separating air is called __________ .
A)fractionation
B)homogenization
C)emulsification
D)precipitation
7.
__________ are substances that can accept positively charged H+ ions.
A)Bases
B)Acids
C)Solutes
D)Hydroniums
8.
Which of the following is a compound?
A)air
B)blood
C)water
D)brass
9.
A solution in which water is the solvent is called a(n) __________ solution.
A)heterogeneous
B)saturated
C)nonpolar
D)aqueous
10.
Sterling silver contains 92.5 percent silver and 7.5 percent copper. Which substance is the solute?
A)platinum
B)copper
C)silver
D)Solids do not form solutions.
11.
A solution that contains all the solute it can hold at a given temperature is __________.
A)soluble
B)unsaturated
C)supersaturated
D)saturated
12.
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
13.
A solid solute that comes back out of solution is called a(n) _________ .
A)aqueous
B)solvent
C)suspension
D)precipitate
14.
A(n) __________ is made of two or more elements chemically combined in fixed ratios.
A)atom
B)mixture
C)compound
D)solution
15.
A mixture that appears to have the same composition, color, and density and is mixed at the molecular level is called a(n) __________.
A)solution
B)suspension
C)heterogeneous mixture
D)element
16.
__________ is the maximum amount of a solute that can be dissolved in a given amount of solvent at a given temperature.
A)Concentration
B)Supersaturation
C)Polarity
D)Solubility
17.
A(n) __________ is the substance being dissolved in a solution.
A)insolvent
B)solvent
C)substrate
D)solute
18.
Matter that has fixed composition is a __________.
A)mixture
B)substance
C)solid
D)solution
19.
__________ are substances that release positively charged hydrogen ions, H+.
A)Bases
B)Solutes
C)Acids
D)Solvents
20.
Which of the following is a solution?
A)chlorine
B)salt water
C)muddy water
D)milk
21.
Which of the following statements is true?
A)Nonpolar solvents are not useful because they do not form solutions with water.
B)Nonpolar solvents are useful for dissolving polar solutes.
C)Nonpolar solvents are useful for dissolving nonpolar solutes.
D)Polar solvents are useful for dissolving nonpolar solutes.
22.
Which of the following is formed when atoms of different elements exchange electrons?
A)nonpolar compounds
B)molecular compounds
C)polar solvents
D)ionic compounds
23.
A mixture in which the substances are not mixed evenly is called __________.
A)homogeneous
B)precipitated
C)a solution
D)heterogeneous
24.
__________ are combinations of substances that can be separated by physical processes.
A)Compounds
B)Elements
C)Mixtures
D)Atoms
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