Focus On Physical Science: California Grade 8

Lesson 1: Solutions

Standards Check

1.
When salt dissolves in water, it has changed __________. 7.c
A)form
B)shape
C)state
D)density
2.
Which of the following contains polar bonds? 7.c
A)water molecules
B)sodium fluoride
C)nitrogen molecules
D)magnesium chloride
3.
A(n) __________ is a bond in which electrons are shared unequally. 7.c
A)polar bond
B)nonpolar
C)ionic
D)intermediate
4.
Which of the following is a solution? 7.c
A)salt water
B)milk
C)muddy water
D)chlorine
5.
A mixture that appears to have the same composition, color, and density and is mixed at the molecular level is called a(n) __________. 7.c
A)solution
B)element
C)suspension
D)heterogeneous mixture
6.
A(n) __________ is made of two or more elements chemically combined in fixed ratios. 7.c
A)compound
B)atom
C)solution
D)mixture
7.
__________ are combinations of substances that can be separated by physical processes. 7.c
A)Mixtures
B)Elements
C)Compounds
D)Atoms
8.
A mixture in which the substances are not mixed evenly is called __________. 7.c
A)heterogeneous
B)homogeneous
C)precipitated
D)a solution
9.
A(n) __________ is the substance being dissolved in a solution. 7.c
A)solute
B)solvent
C)insolvent
D)substrate
10.
Air contains 78 percent nitrogen, 21 percent oxygen, and one percent argon. Which gas is the solvent? 7.c
A)nitrogen
B)oxygen
C)argon
D)none of the above
11.
Sterling silver contains 92.5 percent silver and 7.5 percent copper. Which substance is the solute? 7.c
A)copper
B)silver
C)platinum
D)Solids do not form solutions.
12.
A solution in which water is the solvent is called a(n) __________ solution. 7.c
A)aqueous
B)nonpolar
C)heterogeneous
D)saturated
13.
Which of the following is formed when atoms of different elements exchange electrons? 7.c
A)ionic compounds
B)polar solvents
C)nonpolar compounds
D)molecular compounds
14.
A solution that contains all the solute it can hold at a given temperature is __________. 7.c
A)saturated
B)unsaturated
C)supersaturated
D)soluble
15.
__________ is the maximum amount of a solute that can be dissolved in a given amount of solvent at a given temperature. 7.c
A)Solubility
B)Supersaturation
C)Concentration
D)Polarity
16.
As the temperature of a liquid solvent increases, the amount of solute that can dissolve in it __________. 7.c
A)increases
B)decreases
C)remains constant
D)decreases by one degree Celsius for every milliliter of solvent
Grade 8
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