Focus On Physical Science: California Grade 8

Chapter 9: Acids and Bases in Solution

Standards Review

1.
Elements and compounds are _______. 7.c
A)homogeneous mixtures
B)mixtures
C)solutions
D)substances
2.
Which best describes a homogeneous mixture? 7.c
A)Its composition can vary from place to place in the mixture.
B)The substances are bonded together on the atomic level.
C)The substances are evenly mixed on the atomic level.
D)It contains only one substance.
3.
A _______ is a combination of two or more substances that can be separated by physical means. 7.c
A)compound
B)mixture
C)element
D)substance
4.
All acidic solutions contain _______. 5.e
A)hydronium ions
B)hydroxide ions
C)metallic ions
D)salts
5.
Hydronium ions are produced by the ________. 5.e
A)combination of a water molecule and a hydroxide ion
B)combination of a water molecule and a hydrogen ion
C)neutralization of an acid and a base
D)formation of salts
6.
When a base dissolves in water, _______. 5.e
A)neutralization occurs
B)hydronium ions are produced
C)hydroxide ions are produced
D)a salt is formed
7.
What is the pH of a solution? 5.e
A)a measure of the concentration of water molecules in the solution
B)a measure of the concentration of hydroxide ions in the solution
C)a measure of the concentration of salts in the solution
D)a measure of the concentration of hydronium ions in the solution
8.
What is true about an acidic solution? 5.e
A)The concentration of hydroxide ions is always equal to the concentration of hydronium ions.
B)The concentration of hydroxide ions is greater than the concentration of hydronium ions.
C)The concentration of hydronium ions is greater than the concentration of hydroxide ions.
D)Hydronium ions are converted into hydroxide ions.
9.
Which best describes a solution with a pH of 6.4? 5.e
A)strongly acidic
B)slightly acidic
C)slightly basic
D)strongly basic
10.
Basic solutions have a pH _______. 5.e
A)greater than 7
B)less than 7
C)equal to 14
D)equal to 0
11.
The most accurate way to measure the pH of a solution is to use _______. 5.e
A)red litmus paper
B)an indicator compound
C)a pH meter
D)blue litmus paper
12.
Neutral solutions have a pH of ________ 5.e
A)12
B)2
C)9
D)7
13.
Which is a chemical reaction between an acid and a base in which a salt and water are formed? 5.e
A)salination
B)acidification
C)hydration
D)neutralization
14.
Which of the following acts as a base by accepting a hydrogen ion from water? 5.e
A)sodium hydroxide
B)magnesium hydroxide
C)ammonia
D)vinegar
15.
Solutions that conduct an electric current are called _______. 5.e
A)neutral
B)electrolytes
C)homogeneous
D)alloys
Grade 8
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