chemistry questions powerpoint
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2010-1A12
a. What is the name given to a compound containing a COOH
functional group?
b. Name the following compound: CH3COOH
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2010-1A12
a. What is the name given to a compound containing a COOH functional group?
b. Name the following compound: CH3COOH
Answer: a. Carboxylic Acidb. Acetic Acid or Ethanoic Acid
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2010-1A13
If a negatively charged rod is held near an uncharged metal ball, the metal ball
a. becomes negatively chargedb. becomes positively charged
c. becomes polard. is unaffected
e. affect cannot be determined
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2010-1A13
If a negatively charged rod is held near an uncharged metal ball, the metal ball
a. becomes negatively chargedb. becomes positively charged
c. becomes polard. is unaffected
e. affect cannot be determined
Answer: C
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2010-1A15
Which of the following mixtures would create a buffer?a. HCl and NaCl
b. HNO3 and NaNO3
c. H3PO4 and NaH2PO4
d. H2SO4 and CH3COOH
e. NH3 and NaOH
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2010-1A15Which of the following mixtures would create a buffer?
a. HCl and NaCl
b. HNO3 and NaNO3
c. H3PO4 and NaH2PO4
d. H2SO4 and CH3COOH
e. NH3 and NaOH
Answer: C
Gives a mixture of a weak acid (H3PO4) and its conjugate weak base (H2PO4
-).
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2010-1A16
How many electrons per minute traverse any cross-section of a wire which carries a current of 2 amperes?
The charge of an electron is 1.6 X 10-19 coulomb.
Answer: 7.5 x 1020 electrons/minute
i = q / t 2 amp = (2 coul/sec)(1 elect/1.6x10-19coul)(60 sec/min)
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2010-1A16
How many electrons per minute traverse any cross-section of a wire which carries a current of 2
amperes? The charge of an electron is 1.6 X 10-19 coulomb.
Answer: 7.5 x 1020 electrons/minutei = q / t
2 amp = (2 coul/sec)(1 elect/1.6x10-
19coul)(60 sec/min)
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2010-1A18
Which species is the reducing agent in the following balanced reaction?
Mn2+(aq) + S2O82-(aq) + 2H2O(l) MnO2(s)
+ 4H+(aq) + 2SO42-(aq)
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2010-1A18
Which species is the reducing agent in the following balanced reaction?Mn2+(aq) + S2O8
2-(aq) + 2H2O(l) MnO2(s) + 4H+(aq) + 2SO4
2-(aq)
Answer: Mn2+
Mn2+ gets oxidized to Mn4+ and in the process reduces S+7 to S+6
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2010-1C15
Which of the following compounds have the ability to form hydrogen bonds? (there may be more than one)
a. H2O
b. BF3
c. NH3
d. HF e. CH4
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2010-1C15
Which of the following compounds have the ability to form hydrogen bonds? (there may be more than one)
a. H2O
b. BF3
c. NH3
d. HF e. CH4
Answer: A, C, and D
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2010-1C18
Calculate the molar mass of the amino acid, glycine, which has the following structure:
H2N C
H
H
C
O
OH
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2010-1C18
Calculate the molar mass of the amino acid, glycine, which has the following structure:
Answer: 75 g/mol = 2 C + 5 H + 1 N + 2 O
= 2 (12 g/mol) + 5 (1 g/mol) + 1 (14 g/mol) + 2 (16 g/mol)
H2N C
H
H
C
O
OH
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2010-2A12
What is the common name for acetylsalicylic acid?
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2010-2A12
What is the common name for acetylsalicylic acid?
Answer: Aspirin
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2010-2A14
During the metabolic process, what is the name of the molecules that carry energy
from the citric acid cycle (Kreb’s cycle) pathway to the electron transport
system?
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2010-2A14
During the metabolic process, what is the name of the molecules that carry energy
from the citric acid cycle (Kreb’s cycle) pathway to the electron transport
system?
Answer: NADH or FADH or FADH2
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2010-2A15
What is the name of the polyatomic anion MnO4
- ?
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2010-2A15
What is the name of the polyatomic anion MnO4
- ?
Answer: Permanganate
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2010-2A18
What element has 10 protons?
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2010-2A18
What element has 10 protons?
Answer: Neon
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2010-2C12
What is the ground state electron configuration for Sr (Atomic Number = 38)?
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2010-2C12
What is the ground state electron configuration for Sr (Atomic Number = 38)?
Answer: 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2
or 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 5s2
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2010-2C15
Which element in the periodic table has the largest electronegativity?
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2010-2C15
Which element in the periodic table has the largest electronegativity?
Answer: Fluorine or F
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2010-2C17
The oxygen released during photosynthesis originates from what
compound?
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2010-2C17
The oxygen released during photosynthesis originates from what
compound?
Answer: Water (H2O)
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2010-2C18
What is the oxidation number of carbon in formaldehyde?
O
C
H H
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2010-2C18
What is the oxidation number of carbon in formaldehyde?
O
C
H H
Answer: ZeroEach hydrogen is +1, for a total of +2. Oxygen is -2.The carbon must have an oxidation number of zero to have a neutral compound.
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2010-3A13
What is the common name for elements in Group 2A (second column) in the
periodic table?
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2010-3A13
What is the common name for elements in Group 2A (second column) in the
periodic table?
Answer: Alkaline Earth Metals
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2010-3A14
Draw the Lewis structure for BF3. [Boron is in group 3A and fluorine is in
group 7A.]
F B
F
F F B
F
F
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2010-3A14
Draw the Lewis structure for BF3. [Boron is in group 3A and fluorine is in
group 7A.]
F B
F
F F B
F
F
Must have the 3 fluorines positioned around the boron (left, right, top, or bottom) with single bonds. Each fluorine should have 3 lone pairs (or 6 lone pair electrons).
NOT ACCEPTABLE!!!!
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2010-1B32
Calculate G for the combustion of propane in units of kJ.
C3H8(g) + 5O2(g) 3CO2(g) + 4H2O(g)
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2010-1B32
Calculate G for the combustion of propane in units of kJ.
C3H8(g) + 5O2(g) 3CO2(g) + 4H2O(g)
Answer: -2073.1 kJ
DG° = [3 mol (-394.4 kJ/mol) + 4 mol (-228.6 kJ/mol)] – [1 mol (-24.5 kJ/mol) + 5 mol (0
kJ/mol)]
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2010-1D32
A 0.2688 g sample of a triprotic weak acid (abbreviate H3A) is required to completely react
with 49.2 mL of a 0.08133 M KOH solution. Calculate the molar mass of the weak acid.
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2010-1D32
A 0.2688 g sample of a triprotic weak acid (abbreviate H3A) is required to completely react
with 49.2 mL of a 0.08133 M KOH solution. Calculate the molar mass of the weak acid.
Answer: 201.5 g/mol
H3A + 3 OH- 3 H2O + A3-
AH mol10 x 1.33
KOH mol 3
AH mol 1
KOH L
KOH mol 0.08133
KOH mL 1000
KOH LKOH mL 49.2 3-3
3 xxx
Molar Mass = 0.2688 g / 1.33 x 10-3 molMolar Mass = 201.5 g/mol
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2010-2B32
The concentration of a compound is 1.0 x 10-2 M. If the first order reaction rate constant (k) for the compound is 0.497 days-1, calculate
the concentration 2 days later, assuming first order kinetics.
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2010-2B32
The concentration of a compound is 1.0 x 10-2 M. If the first order reaction rate constant (k)
for the compound is 0.497 days-1, calculate the concentration 2 days later, assuming first order
kinetics.
Answer: 3.7 x 10-3 M
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2010-2D32
Calculate the molarity of concentrated HNO3 given the following:
molar mass = 63.01 g/mol, wt% = 70.4, and density = 1.41 g/mL.
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2010-2D32
Calculate the molarity of concentrated HNO3 given the following:
molar mass = 63.01 g/mol, wt% = 70.4, and density = 1.41 g/mL.
Answer: 15.8 mol/L
L / mol 8.15HNO g 63.01
HNO mol
nsol' L
nsol' mL 1000
nsol' mL
nsol' g 1.41
nsol' g 100
HNO g 70.4
3
33 xxx
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2010-3B32
25.0 g of C3H8 (g) is mixed with 25.0 g of O2 (g). If these compounds react
according to the balanced chemical equation given below, how many grams of
excess reactant remain after the reaction is complete?
[C3H8 = 44.1 g/mol; O2 = 32.0 g/mol; CO2 = 44.0 g/mol; H2O = 18.0 g/mol]
C3H8(g) + 5O2(g) 3CO2(g) + 4H2O(g)
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2010-3B32
25.0 g of C3H8 (g) is mixed with 25.0 g of O2 (g). If these compounds react
according to the balanced chemical equation given below, how many grams of
excess reactant remain after the reaction is complete? [C3H8 = 44.1 g/mol; O2 = 32.0 g/mol; CO2 = 44.0 g/mol; H2O = 18.0
g/mol]
C3H8(g) + 5O2(g) 3CO2(g) + 4H2O(g)
Answer: 18.11 g C3H8 remaining
25.0 g of C3H8 – 6.9 g of C3H8 = 18.1 g C3H8 remaining
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Citric acid (abbreviate as H3A for this problem) is a weak acid with the Ka and Kb values listed below. Calculate the equilibrium pH if 0.100 moles of sodium citrate (Na3A) are dissolved in 1.00 L
of water. Ka1 = 7.44 x 10-4
Ka2 = 1.73 x 10-5
Ka3 = 4.02 x 10-7
Kb1 = 2.49 x 10-8
Kb2 = 5.78 x 10-10
Kb3 = 1.34 x 10-11
Answer: 9.7
Kb1 Reaction: A3- + H2O HA2- + OH-
At Equilibrium: 100 – x x x(ignore x in the denominator)
X = [OH-] = 4.99 x 10-5 M
pOH = 4.3
pH = 14.0 – 4.3 = 9.7
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Citric acid (abbreviate as H3A for this problem) is a weak acid with the Ka and Kb values listed below. Calculate the equilibrium pH if 0.100 moles of sodium citrate (Na3A) are dissolved in 1.00 L of water.
Ka1 = 7.44 x 10-4
Ka2 = 1.73 x 10-5
Ka3 = 4.02 x 10-7
Kb1 = 2.49 x 10-8
Kb2 = 5.78 x 10-10
Kb3 = 1.34 x 10-11
Answer: 9.7
Kb1 Reaction: A3- + H2O HA2- + OH-
At Equilibrium: 100 – x x x(ignore x in the denominator)
X = [OH-] = 4.99 x 10-5 M
pOH = 4.3
pH = 14.0 – 4.3 = 9.7