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1. Which two compounds are electrolytes? dissolved in water?

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1. Which two compounds are electrolytes? dissolved in water?
1. Which two compounds are electrolytes?
A)
B)
C)
D)
2. Which compound is an electrolyte?
A)
C)
B)
D)
3. Which compounds can be classified as electrolytes?
A)
B)
C)
D)
alcohols
alkynes
organic acids
saturated hydrocarbons
4. According to one acid-base theory, a water molecule
acts as an acid when the molecule
A)
B)
C)
D)
donates an H + ion
accepts an H+ ion
donates an OH – ion
accepts an OH – ion
5. According to the Arrhenius theory, a base reacts with
an acid to produce
A)
B)
C)
D)
ammonia and methane
ammonia and a salt
water and methane
water and a salt
6. Given the equation:
HCl(g) + H2O( )
X(aq) + Cl–(aq)
Which ion is represented by X?
A) hydroxide
C) hypochlorite
B) hydronium
D) perchlorate
7. Hydrogen chloride, HCl, is classified as an Arrhenius
acid because it produces
A)
B)
C)
D)
H+ ions in aqueous solution
Cl – ions in aqueous solution
OH – ions in aqueous solution
NH 4+ ions in aqueous solution
8. Which ion is produced when an Arrhenius base is
dissolved in water?
A)
B)
C)
D)
H+ , as the only positive ion in solution
H3O+ , as the only positive ion in solution
OH –, as the only negative ion in solution
H–, as the only negative ion in solution
9. What are the relative ion concentrations in an acid
solution?
A)
B)
C)
D)
more H + ions than OH – ions
fewer H+ ions than OH – ions
an equal number of H + ions and OH– ions
H+ ions but no OH – ions
10. When the pH of a solution is changed from 4 to 3,
the hydronium ion concentration of the solution
A)
B)
C)
D)
decreases by a factor of 10
increases by a factor of 10
decreases by a factor of 100
increases by a factor of 100
11. When the hydronium ion concentration of a solution
is increased by a factor of 10, the pH value of the
solution
A)
B)
C)
D)
decreases 1 pH unit
decreases 10 pH units
increases 1 pH unit
increases 10 pH units
12. Which change in pH represents a hundredfold
increase in the concentration of hydronium ions in a
solution?
A) pH1 to pH 2
C) pH 2 to pH 1
B) pH 1 to pH 3
D) pH 3 to pH 1
13. What is the color of the indicator thymol blue in a
solution that has a pH of 11?
A) red
C) pink
B) blue
D) yellow
14. Based on the results of testing colorless solutions
with indicators, which solution is most acidic?
A)
B)
C)
D)
a solution in which bromthymol blue is blue
a solution in which bromcresol green is blue
a solution in which phenolphthalein is pink
a solution in which methyl orange is red
15. A solution with a pH of 11 is first tested with
phenolphthalein and then with litmus. What is the
color of each indicator in this solution?
A)
B)
C)
D)
20. Given the diagram representing a reaction:
Phenolphthalein is colorless and litmus is blue.
Phenolphthalein is colorless and litmus is red.
Phenolphthalein is pink and litmus is blue.
Phenolphthalein is pink and litmus is red.
16. The results of testing a colorless solution with three
indicators are shown in the table below.
According to one acid-base theory, the water acts as
A)
B)
C)
D)
a base because it accepts an H+
a base because it donates an H +
an acid because it accepts an H +
an acid because it donates an H+
21. Given the equation representing a reversible
reaction:
Which formula could represent the solution tested?
A) NaOH(aq)
C) C6H12O6(aq)
B) HCl(aq)
D) C12H22O11(aq)
17. An aqueous solution of which substance will turn
red litmus paper blue?
A) H2SO 4
C) C2H5OH
B) HCl
D) KOH
18. If an aqueous solution turns blue litmus red which
relationship exists between the hydronium ion and
hydroxide ion concentrations?
[H3O+ ]
[OH–]
A)
>
+
B) [H3O ] < [OH–]
C) [H3O+ ] = [OH–] = 10 –7
D) [H3O+ ] = [OH–] = 10 –14
19. A substance that dissolves in water and produces
hydronium ions as the only positive ions in the
solution is classified as
A) an alcohol
C) a base
B) an acid
D) a salt
NH 4+ (aq) + OH–(aq)
NH 3(g) + H 2O( )
According to one acid-base theory, the reactant that
donates an H + ion in the forward reaction is
A) NH 3(g)
C) NH 4+ (aq)
B) H2O( )
D) OH –(aq)
22. In the reaction:
NH2– + HOH
NH3 + OH–
The two acids are
A) HOH and NH2–
C) OH – and HOH
B) HOH and NH3
D) OH – and NH 3
23. Given the reaction:
HSO 4–(aq) + NH3(g)
NH 4+ (aq) + SO 42–(aq)
Which statement best describes the action of NH 3(g)
in the reaction?
A) It acts as a base, because it is a proton acceptor.
B) It acts as a base, because it is a proton donor.
C) It acts as an acid, because it is a proton
acceptor.
D) It acts as an acid, because it is a proton donor.
24. Which solution reacts with LiOH(aq) to produce a
salt and water?
A) KCl(aq)
C) NaOH(aq)
B) CaO(aq)
D) H2SO 4(aq)
25. What are the products of a reaction between
KOH(aq) and HCl(aq)?
A) H2 and KClO
C) KH and HClO
B) H2O and KCl
D) KOH and HCl
26. Which equation represents a neutralization reaction?
A)
B)
C)
D)
4Fe(s) + 3O 2(g) ® Fe 2O3(s)
2H2(g) + O 2(g) ® 2H2O( )
HNO3(aq) + KOH(aq) ® KNO3(aq) + H 2O( )
AgNO3(aq) + KCl(aq) ® KNO3(aq) + AgCl(s)
27. Which reaction occurs when hydrogen ions react
with hydroxide ions to form water?
A) substitution
C) ionization
B) saponification
D) neutralization
28. The formula for the calcium salt of sulfuric acid is
A) CaS
C) CaSO 4
B) Ca2S
D) Ca2SO 4
29. Which process uses a volume of solution of known
concentration to determine the concentration of
another solution?
A) distillation
C) transmutation
B) substitution
D) titration
30. If 5.0 milliliters of a 0.20 M HCl solution is required
to neutralize exactly 10. milliliters of NaOH, what is
the concentration of the base?
A) 0.10 M
C) 0.30 M
B) 0.20 M
D) 0.40 M
31. If 50. milliliters of a 1.0 M NaOH solution is needed
to exactly neutralize 10. milliliters of an HCl
solution, the molarity of the HCl solution is
A) 1.0 M
C) 5.0 M
B) 0.20 M
D) 10. M
32. How many milliliters of 1.0 M H2SO 4 are needed to
exactly neutralize 15 milliliters of 2.0 M Ba(OH) 2?
A) 7.5 ml
C) 15 ml
B) 10. ml
D) 30. ml
33. Base your answer to the following question on
the information below and on your knowledge of chemistry.
The pH of various aqueous solutions are shown in the table below.
State how many times greater the hydronium ion concentration in the HCl(aq) is than the hydronium
ion concentration in the HC2H3O2(aq).
34. Base your answer to the following question on the information below.
The health of fish depends on the amount of oxygen dissolved in the water. A dissolved oxygen
(DO) concentration between 6 parts per million and 8 parts per million is best for fish health. A
DO concentration greater than 1 part per million is necessary for fish survival.
Fish health is also affected by water temperature and concentrations of dissolved ammonia,
hydrogen sulfide, chloride compounds, and nitrate compounds. Most freshwater fish thrive in
water with a pH between 6.5 and 8.5.
A student’s fish tank contains fish, green plants, and 3800 grams of fish-tank water with 2.7 x
10-2 gram of dissolved oxygen. Phenolphthalein tests colorless and bromthymol blue tests blue in
samples of the fish-tank water.
When the fish-tank water has a pH of 8.0, the hydronium ion concentration is
1.0 10 –8 mole per liter. What is the hydronium ion concentration when the water has a pH of 7.0?
35. Base your answer to the following question on on the information below.
A laboratory worker filled a bottle with a hydrochloric acid solution. Another bottle was filled
with methanol, while a third bottle was filled with a sodium hydroxide solution. However, the
worker neglected to label each bottle. After a few days, the worker could not remember which
liquid was in each bottle.
The worker needed to identify the liquid in each bottle. The bottles were labeled A, B, and C.
Using materials found in the lab (indicators, conductivity apparatus, and pieces of Mg metal), the
worker tested samples of liquid from each bottle. The test results are shown in the table below.
Explain, in terms of pH, why the methyl orange indicator test results were the same for each of the
three liquids.
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