QUESTION 1
Which of the following properties is NOT a property of water?
strong surface tension
high capillary action with glass
ability to dissolve polar molecules
spontaneous dissociation into gases
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QUESTION 2
Every solution is composed of a solvent and at least one:
suspension
solute
solid
saturated substance
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QUESTION 3
Why does stirring increase the rate of solution formation for a solid solute in a liquid solvent?
Stirring brings solute particles closer together and provides them with additional energy.
Stirring mixes solute particles with solvent particles more thoroughly, providing more chances of interaction.
Stirring makes the entire solution warmer so that the temperature increases noticeably.
Stirring agitates the solute particles and increases the rate of precipitation.
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QUESTION 4
A solution in which equilibrium exists between dissolved and undissolved solute must be:
dilute
saturated
unsaturated
concentrated
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QUESTION 5
Imported Asset
At which temperature would a 40-gram KCl per 100 grams of water solution, be considered supersaturated?
30°
50°
70°
80°
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QUESTION 6
Using solubility rules, determine if the following compounds are soluble in water.
insoluble
Read Answer Items for Question 6
soluble
Read Answer Items for Question 6
Answer
A.
Ca(NO3)2
B.
Mg3(PO4)2
4 points Save Answer
QUESTION 7
Predict whether the following double-replacement reaction will produce a precipitate: MgCl2 + Li2CO3 Imported Asset MgCO3 + 2 LiCl.
No; all products are soluble
Yes; the MgCO3 will precipitate
Yes; the LiCl will precipitate
Yes; both the MgCO3 and the LiCl will precipitate
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QUESTION 8
Write the overall, ionic and net ionic equations for the following reaction.
Nitric acid (HNO3) and barium hydroxide (Ba(OH)2) (please respond with a few sentences explaining)
4 points Save Answer
QUESTION 9
A solution is prepared by mixing 0.767 kg of sulfuric acid (H2SO4) with 2.71 kg of water to make 3.00 L of solution. What is the percentage composition by mass of sulfuric acid in this solution?
22.0%
25.6%
27.1%
28.3%
3 points Save Answer
QUESTION 10
You have 100 milliliters of a 0.50 M MgBr2 solution and dilute it to a total volume of 200 milliliters. What is the molarity of the resulting solution? (please respond with a few sentences explaining)
4 points Save Answer
QUESTION 11
Which two factors determine the vapor pressure of a solution containing a non-volatile solute dissolved in a volatile solvent, at a given temperature?
the molar mass of the solute and the volume of the solution
the vapor pressure of the solute and the concentration of the solvent
the concentration of the solute and the molar mass of the solvent
the vapor pressure of the solvent and the concentration of the (non-volatile) solute particles
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QUESTION 12
Calculate the freezing point of a 2.6-molal aqueous sucrose solution. The freezing point depression constant for water is 1.86 degrees C/molal.
4.8 °C
1.4 °C
-1.4 °C
-4.8 °C
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QUESTION 13
Acids generally:
enhance the properties of bases
release hydrogen gas when mixed with metals
feel slippery
taste bitter
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QUESTION 14
Which material is most likely to be a base?
salt water
vinegar
coffee
orange juice
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QUESTION 15
Write an overall equation for the acid-base reaction that would be required to produce the following salt.
MgCl2 (please respond with a few sentences explaining)
4 points Save Answer
QUESTION 16
Rank the acid-base definitions from most specific (exclusive) to most general (inclusive):
Arrhenius, Brønsted-Lowry, Lewis
Arrhenius, Lewis, Brønsted-Lowry
Brønsted-Lowry, Lewis, Arrhenius
Lewis, Arrhenius, Brønsted-Lowry
1 points Save Answer
QUESTION 17
Acids:
are generally proton donors
produce H+ ions in solution
are electron pair acceptors
may include all of these characteristics
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QUESTION 18
Bases:
are generally proton acceptors
produce OH− ions in solution
are electron pair donors
may include all of these characteristics
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QUESTION 19
The formula HNO3 is named:
nitrous acid
nitric acid
hydrogen nitrogen trioxide
hydrogen nitrite
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QUESTION 20
Weak acids:
are always more soluble than strong acids
have a higher degree of dissociation than do strong acids
only ionize a fraction of their molecules
always produce weak conjugate bases
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QUESTION 21
Milk is only slightly acidic. The pH of milk is closest to:
2
4
6
8
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QUESTION 22
The pH of a solution measures the [H3O+] in the solution. If one solution has a pH of 4 and another solution has a pH of 3, how does the [H3O+] in the two solutions compare?
They are in a 1:1 ratio.
They are in a 1:10 ratio.
They are in a 1:100 ratio.
They are in a 1:1000 ratio.
3 points Save Answer
QUESTION 23
A solution has a [OH−] of 1 x 10−9. What is the pOH of this solution?
5
7
9
12
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QUESTION 24
When weak acids react with strong bases, the H+ from the weak acid is transferred to the:
metal of the strong base to form a metal hydride
OH− from the strong base to form water and a salt
salt that is produced
water molecule that is produced
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QUESTION 25
Write the overall, ionic and net ionic equations for the following reaction.Hydrochloric acid (HCl) and potassium hydroxide (KOH) (please respond with a few sentences explaining)
4 points Save Answer
QUESTION 26
How many milliliters of a 0.100 M NaOH solution are required to neutralize 25.0 milliliters of 0.150 M HCl?
25.0 ml
37.5 ml
125 ml
167 ml
3 points Save Answer
QUESTION 27
If a small amount of excess acid is added to a buffered solution, the pH of the solution should:
change sharply and then neutralize
remain very close to the original pH value
fluctuate rapidly between high and low values and then achieve a neutral balance
neutralize instantaneously
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QUESTION 28
Oxidation numbers can be used to identify the element that is being oxidized and the element that is being reduced in a redox equation.
TRUE
FALSE
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QUESTION 29
Although aluminum is a more active metal than iron, and therefore, oxidizes more quickly than iron, aluminum degrades much more slowly than iron. This is because:
There is more aluminum than iron available on the Earth.
Aluminum oxide coats the exposed aluminum surfaces preventing further corrosion.
The iron is more reactive with a greater number of environmental agents.
The iron oxide is much more soluble in water than the aluminum oxide.
3 points Save Answer
QUESTION 30
Although Group 7A ions may have different oxidation states depending on which other elements are in the compound, the most common oxidation number for Group 7A (Group 17) ions is:
1−
3+
5+
7+
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QUESTION 31
Identify the oxidizing agent in the following equation: Al (s) + 3 Ag+ (aq) Imported Asset Al+3 (aq) + 3 Ag (s).
Al (s)
Ag+ (aq)
Al+3 (aq)
Ag (s)
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QUESTION 32
Balance the following oxidation-reduction reaction and indicate which atoms have undergone oxidation and reduction.____FeCl3 + ____H2S Imported Asset ____FeCl2 + ____S + ____HCl (please respond with a few sentences explaining)
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QUESTION 33
In a similar way to oxidation-reduction reactions, half-reactions can be written for electrochemical reactions.
TRUE
FALSE
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QUESTION 34
Voltaic cells and electrolytic cells are similar because:
Both cells use a salt bridge to keep the electrons flowing within the cells.
Both cells have a positive anode.
Both cells have a negative cathode.
Both cells require the input of energy.
