Chem
問題一覧
1
What is the ideal gas law
PV = nRT
2
What happens to the volume of a gas when you double the number of moles of gas while keeping the temperature and pressure constant?
The volume doubles
3
Which of the following statements about pressure is FALSE?
A deep well dug in the ground must have the pump located at the bottom of well in order to have the water come to the surface.
4
Gas particles act independently of each other.
True
5
The conversion factor for pressure is 1 mm Hg = 1 atm.
False
6
If some argon gas at 400 mm Hg pressure is forced into a gas cylinder that already contained only neon gas at 400mm Hg pressure, the total pressure in the cylinder would now be 800 mm Hg.
True
7
What is the equivalent pressure of 0.905 atm in units of mm Hg?
688
8
The pressure will be twice the original value
9
9. A balloon filled with 0.500 L of air at sea level is submerged in the water to a depth that produces a pressure of 3.25 atm. What is the volume of the balloon at this depth?
0.154
10
A balloon originally had a volume of 0.439 L at 44°C and a pressure of 729 torr. To what temperature must the balloon be cooled to reduce its volume to 378 mL if the pressure remained constant?
0
11
11. A sample of helium gas initially at 37.0°C, 785 torr and 2.00 L was heated to 58.0°C while the volume expanded to 3.24 L. What is the final pressure in atm?
0.681
12
How many liters of O2 (g) are needed to react completely with 56.0 L of CH4 (g) at STP to produce
CO2 (g) and H20 (g)?
Given: CH4 (g) + 202 (g) → CO2 (g) + H20 (g)
112 L
13
What is the final pressure (expressed in atm) of a 3.05 L system initially at 724 mm Hg and 298 K, that is compressed to a final volume of 2.51 L at 273 K?
1.06
14
the number of moles of a gas initially contained in a 2.10 L vessel is doubled, what is the final volume of the gas in liters? (Assume the pressure and temperature remain constant.)
4.20
15
What is the final volume (L) of a 1.00 L system at 315 K and 1.10 atm if STP conditions are established?
0.953
16
Ammonia gas decomposes according to the equation:
2NH3(g) → N2(g) + 3H2(g)
If 15.0 L of nitrogen is formed at STP, how many liters of hydrogen will be produced (also measured at STP)?
45 L
17
18. A solution is a homogeneous mixture of two or more substances.18. A solution is a homogeneous mixture of two or more substances.
True
18
Vitamin C is a water-soluble vitamin, so it is likely that this vitamin is polar.
True
19
The solubility of gases in water increases with increasing pressure above the water.
True
20
Osmotic pressure is the pressure required to completely reverse the direction of solvent movement in Osmosis
True
21
Which of the following substances is NOT a solution?
homogenized milk
22
Hexane, a nopolar solvent, will dissolve which of the following substances?
oil
23
How many moles of KOH are contained in 750. mL of 5.00 M KOH solution?
3.75 mol
24
You need to prepare 2.00 L of 0.100 M NazCO solution. The best procedure is to weigh out:
21.2 g NaCO3 and add water until the final solution has a volume of 2.00 L.
25
Oftentimes solubility of a compound limits the concentration of the solution that can be prepared. Use the solubility data given with each compound shown below to determine which compound would allow the preparation of a 10.0 Molar solution.
NaNo3 ( sol 89/100)
26
A 0.15 M solution of BaCl contains:
0.15 M Ba2+ ions and 0.30 M CL-
27
Which solution below contains the highest total quantity of dissolved sodium ions?
75 mL of 3.0 M Na2SO4
28
How much water would you ADD to 175 mL of 6.00 M hydrochloric acid to prepare a 2.00 M solution of this acid?
350 mL
29
How many mL of 0.218 M sodium sulfate react with exactly 25.34 mL of 0.113 M BaCl given the reaction:
BaC(aq) + Na2SO4(aq) → BaSO4(s) + 2NaCl (aq)
13.1
30
What is the molality of a solution made by dissolving 14.7 g of C6H1206 into 150.0 ml of water?
Assume the density of water is 1.00 g/mL.
0.544
31
Solution A has a concentration of 0.10 M sugar and Solution B has a concentration of 0.20 M sugar. If the two solutions are separated by a semipermeable membrane, which of the following occurs during osmosis?
The morality of A increases
32
How many mL of 0.112 M Pb(NO3)2 are needed to completely react with 25.0 mL of 0.105 M KI?
Given: Pb(NO3)2(aq) + 2KI(aq) → Pb2(s) + 2KNO(ag)
11.7
33
Acids produce H+ ions in solution
true
34
The conjugate base to HSO4- is SO42-
True
35
The Arrhenius definition of an acid is:
Produces H+ in solution
36
The Bronsted Lowry definition of a base is
a proton acceptor
37
In which solution is the H3O+ less than 0.250 M
all of these
38
A 0.10 M solution of an electrolyte has a Ph of 4.5. The electrolyte is
a weak acid
39
Ammonia (NH3) jonizes in water to form a basic solution. What is the concentration of OH ions in a
0.75 M NH3 solution?
< 0.75
40
What is the concentration of the hydroxide ion given that the concentration of the hydronium ion is 1.5 x 10-5 M
6.7 x 10-10
41
The titration of 25.00 mL a 0.125 M HCIO4 solution required 21.37 mL of KOH to reach the endpoint.
What is the concentration of the KOH?
0.146
42
What is the concentration of H+ in solution given the [OH-] = 2.54 x 10-4
3.94 x 10-11
43
Which solution below would be considered the most acidic
2.9 x 10-4
44
What is the pH of a solution that has a [OH-] = 0.0033
11.52
45
Which solution below has the highest concentration of the hydronic ions in an acidic solution
pH 12.49
46
What is the concentration of the hydronic ions in an acidic solution
> 1.0 x 10-7
47
substances that can act both as an acid and as a base are called
amphoteric
48
A buffer solution is all of the following except
a solution that regulates pH because it is such a strong acid or base
49
which combination below will be a buffer solution
HC2H3O2 and NaC2H3O2
50
the following reaction:
CO3- (aq) + H2O (aq) → H2CO3 (ag) + OH- (aq)
HCO3- is an acid and H2CO3 is its conjugate base
問題一覧
1
What is the ideal gas law
PV = nRT
2
What happens to the volume of a gas when you double the number of moles of gas while keeping the temperature and pressure constant?
The volume doubles
3
Which of the following statements about pressure is FALSE?
A deep well dug in the ground must have the pump located at the bottom of well in order to have the water come to the surface.
4
Gas particles act independently of each other.
True
5
The conversion factor for pressure is 1 mm Hg = 1 atm.
False
6
If some argon gas at 400 mm Hg pressure is forced into a gas cylinder that already contained only neon gas at 400mm Hg pressure, the total pressure in the cylinder would now be 800 mm Hg.
True
7
What is the equivalent pressure of 0.905 atm in units of mm Hg?
688
8
The pressure will be twice the original value
9
9. A balloon filled with 0.500 L of air at sea level is submerged in the water to a depth that produces a pressure of 3.25 atm. What is the volume of the balloon at this depth?
0.154
10
A balloon originally had a volume of 0.439 L at 44°C and a pressure of 729 torr. To what temperature must the balloon be cooled to reduce its volume to 378 mL if the pressure remained constant?
0
11
11. A sample of helium gas initially at 37.0°C, 785 torr and 2.00 L was heated to 58.0°C while the volume expanded to 3.24 L. What is the final pressure in atm?
0.681
12
How many liters of O2 (g) are needed to react completely with 56.0 L of CH4 (g) at STP to produce
CO2 (g) and H20 (g)?
Given: CH4 (g) + 202 (g) → CO2 (g) + H20 (g)
112 L
13
What is the final pressure (expressed in atm) of a 3.05 L system initially at 724 mm Hg and 298 K, that is compressed to a final volume of 2.51 L at 273 K?
1.06
14
the number of moles of a gas initially contained in a 2.10 L vessel is doubled, what is the final volume of the gas in liters? (Assume the pressure and temperature remain constant.)
4.20
15
What is the final volume (L) of a 1.00 L system at 315 K and 1.10 atm if STP conditions are established?
0.953
16
Ammonia gas decomposes according to the equation:
2NH3(g) → N2(g) + 3H2(g)
If 15.0 L of nitrogen is formed at STP, how many liters of hydrogen will be produced (also measured at STP)?
45 L
17
18. A solution is a homogeneous mixture of two or more substances.18. A solution is a homogeneous mixture of two or more substances.
True
18
Vitamin C is a water-soluble vitamin, so it is likely that this vitamin is polar.
True
19
The solubility of gases in water increases with increasing pressure above the water.
True
20
Osmotic pressure is the pressure required to completely reverse the direction of solvent movement in Osmosis
True
21
Which of the following substances is NOT a solution?
homogenized milk
22
Hexane, a nopolar solvent, will dissolve which of the following substances?
oil
23
How many moles of KOH are contained in 750. mL of 5.00 M KOH solution?
3.75 mol
24
You need to prepare 2.00 L of 0.100 M NazCO solution. The best procedure is to weigh out:
21.2 g NaCO3 and add water until the final solution has a volume of 2.00 L.
25
Oftentimes solubility of a compound limits the concentration of the solution that can be prepared. Use the solubility data given with each compound shown below to determine which compound would allow the preparation of a 10.0 Molar solution.
NaNo3 ( sol 89/100)
26
A 0.15 M solution of BaCl contains:
0.15 M Ba2+ ions and 0.30 M CL-
27
Which solution below contains the highest total quantity of dissolved sodium ions?
75 mL of 3.0 M Na2SO4
28
How much water would you ADD to 175 mL of 6.00 M hydrochloric acid to prepare a 2.00 M solution of this acid?
350 mL
29
How many mL of 0.218 M sodium sulfate react with exactly 25.34 mL of 0.113 M BaCl given the reaction:
BaC(aq) + Na2SO4(aq) → BaSO4(s) + 2NaCl (aq)
13.1
30
What is the molality of a solution made by dissolving 14.7 g of C6H1206 into 150.0 ml of water?
Assume the density of water is 1.00 g/mL.
0.544
31
Solution A has a concentration of 0.10 M sugar and Solution B has a concentration of 0.20 M sugar. If the two solutions are separated by a semipermeable membrane, which of the following occurs during osmosis?
The morality of A increases
32
How many mL of 0.112 M Pb(NO3)2 are needed to completely react with 25.0 mL of 0.105 M KI?
Given: Pb(NO3)2(aq) + 2KI(aq) → Pb2(s) + 2KNO(ag)
11.7
33
Acids produce H+ ions in solution
true
34
The conjugate base to HSO4- is SO42-
True
35
The Arrhenius definition of an acid is:
Produces H+ in solution
36
The Bronsted Lowry definition of a base is
a proton acceptor
37
In which solution is the H3O+ less than 0.250 M
all of these
38
A 0.10 M solution of an electrolyte has a Ph of 4.5. The electrolyte is
a weak acid
39
Ammonia (NH3) jonizes in water to form a basic solution. What is the concentration of OH ions in a
0.75 M NH3 solution?
< 0.75
40
What is the concentration of the hydroxide ion given that the concentration of the hydronium ion is 1.5 x 10-5 M
6.7 x 10-10
41
The titration of 25.00 mL a 0.125 M HCIO4 solution required 21.37 mL of KOH to reach the endpoint.
What is the concentration of the KOH?
0.146
42
What is the concentration of H+ in solution given the [OH-] = 2.54 x 10-4
3.94 x 10-11
43
Which solution below would be considered the most acidic
2.9 x 10-4
44
What is the pH of a solution that has a [OH-] = 0.0033
11.52
45
Which solution below has the highest concentration of the hydronic ions in an acidic solution
pH 12.49
46
What is the concentration of the hydronic ions in an acidic solution
> 1.0 x 10-7
47
substances that can act both as an acid and as a base are called
amphoteric
48
A buffer solution is all of the following except
a solution that regulates pH because it is such a strong acid or base
49
which combination below will be a buffer solution
HC2H3O2 and NaC2H3O2
50
the following reaction:
CO3- (aq) + H2O (aq) → H2CO3 (ag) + OH- (aq)
HCO3- is an acid and H2CO3 is its conjugate base