Chemistry Practice Test (Page 2 of 3) in pdf

20. _____ Which of the following can conduct an

23. Explain how the pH results in this table enable a

electric current?

student to correctly conclude that bottle 3 contains

(a) Mg(OH)2(s)

(b) H2O(s)

the drain cleaner. [1]

(d) NH4Cl(s)

Base your answers to questions 21 and 22 on the

information below.

Using burettes, a student titrated a sodium hydroxide

solution of unknown concentration with a standard

24. Explain, in terms of the pH values, why thymol

solution of 0.10 M hydrochloric acid. The data are

blue is not a suitable indicator to distinguish between

recorded in the table below.

the contents of bottle 1 and bottle 2. [1]

Titration Data

Solution

HCl (aq)

NaOH (aq)

Initial Burette

15.50

5.00

Reading (mL)

Final Burette

25.00

8.80

Reading (mL)

21. Determine both the total volume of HCl(aq) and

the total volume of NaOH(aq) used in the titration.

Base your answers to questions 25 and 26 on the

[1]

passage below.

Acid rain lowers the pH in ponds and lakes and over

time can cause the death of some aquatic life. Acid

rain is caused in large part by the burning of fossil

fuels in power plants and by gasoline-powered

vehicles. The acids commonly associated with acid

rain are sulfurous acid, sulfuric acid, and nitric acid.

In general, fish can tolerate a pH range between 5 and

9. However, even small changes in pH can

22. Calculate the molarity of the sodium hydroxide

significantly affect the solubility and toxicity of

solution. Show all work. [1]

common pollutants. Increased concentrations of these

pollutants can adversely affect the behavior and

normal life processes of fish and cause deformity,

lower egg production, and less egg hatching.

25. Acid rain caused the pH of a body of water to

decrease. Explain this pH decrease in terms of the

change in concentration of hydronium ions. [1]

Base your answers to questions 23 and 24 on the

information below.

Three bottles of liquids labeled 1, 2, and 3 were

found in a storeroom. One of the liquids is known to

be drain cleaner. Drain cleaners commonly contain

KOH or NaOH. The pH of each liquid at 25°C was

determined with a pH meter. The table below shows

the test results.

pH Test Results

26. Write the chemical formula of a negative

Bottle

pH of liquid

polyatomic ion present in an aqueous nitric acid

3.8

solution. [1]

7.0

12.8

Chemistry Practice Test Page 2

Related Articles

Related forms

Related Categories