Page path
• CHEM101_MH_V4
• Topic 16: Nonmetallic Elements and Organic Chemistry
Started on Friday, April 15, 2022, 9:09
... [Show More] PM
State Finished
Completed on Friday, April 15, 2022, 9:31 PM
Time taken 22 mins 2 secs
Grade 110.40 out of 115.00 (96%)
Question 1
Correct
4.60 points out of 4.60
Flag question
Question text
What is ΔS° for the following reaction?
4Cr(s) + 3O2(g) → 2Cr2O3(s)
Substance Cr(s) O2(g) Cr2O3(s)
S°(J/K • mol) 23.77 205.138 80.65
Select one:
a. –549.19 J/K • mol
b. –148.26 J/K • mol
c. +148.26 J/K • mol
d. +66.22 J/K • mol
e. +871.80 J/K • mol
Question 2
Correct
4.60 points out of 4.60
Flag question
Question text
A spontaneous reaction
Select one:
a. is always exothermic.
b. may be exothermic or endothermic.
c. is always endothermic.
d. does not involve any heat exchange with surroundings.
Question 3
Correct
4.60 points out of 4.60
Flag question
Question text
Which is the thermodynamic condition for a spontaneous process at constant T and P?
Select one:
a. ΔS > 0
b. ΔS < 0
c. ΔG < 0
d. ΔG > 0
e. ΔG° = 0
Question 4
Correct
4.60 points out of 4.60
Flag question
Question text
Consider the following redox equation.
Mn(OH)2(s) + MnO4–(aq) → MnO42–(aq) (basic solution)
When the equation is balanced with the smallest whole number coefficients, what is the coefficient for OH–(aq) and on which side of the equation is OH–(aq) present?
Select one:
a. 4, reactant side
b. 4, product side
c. 6, reactant side
d. 6, product side
e. 8, reactant side
Question 5
Correct
4.60 points out of 4.60
Flag question
Question text
Which statement is correct?
Select one:
a. The cathode is the electrode where the oxidation takes place.
b. The cathode is the electrode where the reduction takes place.
c. Both oxidation and reduction make take place at the cathode, depending on the cell.
d. The cathode is always positive.
e. The anode is always negative.
Question 6
Correct
4.60 points out of 4.60
Flag question
Question text
Which one of the following statements relating to the glass electrode is correct?
Select one:
a. The glass electrode detects hydrogen gas.
b. The glass of a glass electrode serves to conduct electrons.
c. When pH is measured, only a single electrode, the glass electrode, need be used.
d. The potential of the glass electrode varies linearly with the pH of the solution.
e. None of these statements is correct.
Question 7
Correct
4.60 points out of 4.60
Flag question
Question text
Two cells are connected in series, so that the same current flows through two electrodes, where the following half-reactions occur:
Cu2+(aq) + 2e– → Cu(s) and Ag+(aq) + e– → Ag(s)
For every 1.00 g of copper produced in the first process, how many grams of silver will be produced in the second one?
Select one:
a. 0.294 g Ag
b. 0.588 g Ag
c. 0.850 g Ag
d. 1.70 g Ag
e. 3.40 g Ag
Question 8
Correct
4.60 points out of 4.60
Flag question
Question text
Iodine-131, t1/2 = 8.0 days, is used in the diagnosis and treatment of thyroid gland diseases. If a laboratory sample of iodine-131 initially emits 9.95 × 1018 β particles per day, how long will it take for the activity to drop to 6.22 × 1017 β particles per day?
Select one:
a. 2.0 days
b. 16 days
c. 32 days
d. 128 days
e. None of the answers is correct.
Question 9
Correct
4.60 points out of 4.60
Flag question
Question text
The dose unit of ionizing radiation is called the rad. The rad is defined in terms of
Select one:
a. the half-life of a radioisotope.
b. the energy deposited per gram of an object.
c. the biological damage produced.
d. the accumulation of fission products.
e. the number of ions per centimeter.
Question 10
Correct
4.60 points out of 4.60
Flag question
Question text
Alpha particles are identical to
Select one:
a. protons.
b. helium atoms.
c. hydrogen atoms.
d. helium nuclei.
e. electrons.
Question 11
Correct
4.60 points out of 4.60
Flag question
Question text
In the following reaction, identify X.
Select one:
a.
b.
c.
d.
e.
Question 12
Correct
4.60 points out of 4.60
Flag question
Question text
Which of the following ions could exist in only the high-spin state in an octahedral complex?
Select one:
a. Cr2+
b. Mn4+
c. Fe3+
d. Co3+
e. Ni2+
Question 13
Correct
4.60 points out of 4.60
Flag question
Question text
Iron(III) forms an octahedral complex with the ligand CN–. How many unpaired electrons are in the d orbitals of iron?
Select one:
a. 1
b. 3
c. 5
d. 7
e. 9
Question 14
Correct
4.60 points out of 4.60
Flag question
Question text
Which of these atoms is the most electronegative?
Select one:
a. Si
b. Cl
c. P
d. F
e. C
Question 15
Incorrect
0.00 points out of 4.60
Flag question
Question text
How many resonance structures does the sulfur dioxide molecule have?
Select one:
a. 0
b. 3
c. 1
d. 2
e. 4
Question 16
Correct
4.60 points out of 4.60
Flag question
Question text
Which of these pairs consists of isoelectronic species?
Select one:
a. Zn2+ and Cu2+
b. Cl– and S
c. Na+ and K+
d. Mn2+ and Ar
e. K+ and Cl–
Question 17
Correct
4.60 points out of 4.60
Flag question
Question text
What products are formed from the reaction of Cl2(g) with I–(aq)?
Select one:
a. ICl
b. ICl2
c. ICl3
d. I2 and Cl–
e. I and Cl2–
Question 18
Correct
4.60 points out of 4.60
Flag question
Question text
Which of the following is the strongest acid?
Select one:
a. HClO3
b. HBrO3
c. HIO3
d. HIO2
e. HClO
Question 19
Correct
4.60 points out of 4.60
Flag question
Question text
The nitrate anion is
Select one:
a. a strong acid.
b. a strong base.
c. amphoteric.
d. a strong reducing agent.
e. a strong oxidizing agent.
Question 20
Correct
4.60 points out of 4.60
Flag question
Question text
Which of the following is a metalloid?
Select one:
a. Al
b. Sn
c. As
d. Se
e. Bi
Question 21
Correct
4.60 points out of 4.60
Flag question
Question text
Which is NOT a hydride?
Select one:
a.
b.
c.
d.
e.
Question 22
Correct
4.60 points out of 4.60
Flag question
Question text
Which of these elements is the most abundant in the universe?
Select one:
a. Hydrogen
b. Nitrogen
c. Carbon
d. Oxygen
e. Sodium
Question 23
Correct
4.60 points out of 4.60
Flag question
Question text
What process involves the addition of a hydrogen molecule to compounds containing multiple bonds?
Select one:
a. Hydration
b. Alkanation
c. Hydrogenation
d. Esterification
e. Coagulation
Question 24
Correct
4.60 points out of 4.60
Flag question
Question text
Which one of these compounds will result from the addition of HCl to CH3−CH=CH2?
Select one:
a. CH3Cl + CH2=CH2
b. CH3−CHCl=CH2
c. CH3−CHCl–CH3
d. CH3−CH2−CH2Cl
e. None of these choices is correct.
Question 25
Correct
4.60 points out of 4.60
Flag question
Question text
Which one of these materials is a copolymer?
Select one:
a. Polystyrene-polybutadiene
b. Polyvinyl chloride
c. Polypropylene
d. Poly-cis-isoprene
e. Polyethylene [Show Less]