Chm 113 Final Exam Questions and answers latest
update
Which of the following is classified as a physical change?
(a) Samples of hydrogen and oxygen gas combine to form H2O upon heating
(b) A solid piece of dry ice sublimes into the gas phase, producing a dense fog
(c) The mercury in a thermometer expands when heated
(d) (b) and (c)
(e) All of the above - ANSWER -(d) (b) and (c)
Which of these elements is paired incorrectly with its chemical symbol?
(a) As = astatine
(b) Cu = copper
(c) Sn = tin
(d) Pb = lead
(e) W = tungsten - ANSWER -(a) As = astatine
Which of the following phase changes is the opposite of deposition?
(a) Melting
(b) Vaporization
(c) Condensation
(d) Sublimation
(e) Constipation - ANSWER -(d) Sublimation
Iron has a density of 7.9 g/cm3
. What is the mass of a cube of iron with the length of one side equal to
55.0 mm?
(a) 2.1 x 10⁴
g
(b) 4.3 x 10²
g
(c) 1.3 x 10³ g
(d) 1.4 g
(e) 2.3 x 10⁻²
,g - ANSWER -(c) 1.3 x 10³ g
**How many electrons are there in one ion of ²²⁶Ra²⁺?
(a) 86 e⁻
(b) 88 e⁻
(c) 226 e⁻
(d) 228 e⁻
(e) 140 e⁻ - ANSWER -(a) 86 e⁻
Which of the following scientists determined the mass and charge of an electron
by irradiating oil
droplets with X-Rays and observing their behavior?
(a) JJ Thomson
(b) Ernest Rutherford
(c) Marie Curie
(d) Robert Millikan
(e) Miley Cyrus - ANSWER -(d) Robert Millikan
What is the oxidation number of the phosphorous atom in the polyatomic ion,
phosphate (PO43-)?
(a) + 3
(b) - 3
(c) + 5
(d) + 1
(e) - 4 - ANSWER -(c) + 5
What is the chemical formula of perchloric acid?
(a) HCl
(b) CH₃COOH
(c) H₃PO₄
(d) HClO₄
(e) HClO₃ - ANSWER -(d) HClO₄
What is the name of the compound, NiBr2?
(a) Nickel (II) bromide
, (b) Nickel bromide
(c) Mononickel dibromide
(d) Nickel dibromide
(e) Nickel McBromide, the 2nd - ANSWER -(a) Nickel (II) bromide
What is the chemical formula of the compound, potassium permanganate?
(a) KMnO₂
(b) KMg
(c) KClO₄
(d) KMnO₄
(e) KMgO₂ - ANSWER -(d) KMnO₄
What is the likely chemical formula of the compound formed between silver and
nitrogen?
(a) AgN
(b) Ag₃N
(c) AgN₃
(d) Ag₂N₃
(e) Ag₃N₂ - ANSWER -(b) Ag₃N
16) Which of the following compounds exhibits polar covalent bonding?
(a) O₂
(b) CaBr₂
(c) PCl₅
(d) NaCl
(e) The Yeti that stole your Wheat Thins last night - ANSWER -(c) PCl₅
Which of the following statements about isotopes is false?
(a) All isotopes of the same element have the same number of protons
(b) Isotopes of the same element have different masses due to a different number
of neutrons
(c) Only one isotope of each element occurs naturally
(d) The atomic mass of an element on the periodic table is determined by
multiplying the mass of each
update
Which of the following is classified as a physical change?
(a) Samples of hydrogen and oxygen gas combine to form H2O upon heating
(b) A solid piece of dry ice sublimes into the gas phase, producing a dense fog
(c) The mercury in a thermometer expands when heated
(d) (b) and (c)
(e) All of the above - ANSWER -(d) (b) and (c)
Which of these elements is paired incorrectly with its chemical symbol?
(a) As = astatine
(b) Cu = copper
(c) Sn = tin
(d) Pb = lead
(e) W = tungsten - ANSWER -(a) As = astatine
Which of the following phase changes is the opposite of deposition?
(a) Melting
(b) Vaporization
(c) Condensation
(d) Sublimation
(e) Constipation - ANSWER -(d) Sublimation
Iron has a density of 7.9 g/cm3
. What is the mass of a cube of iron with the length of one side equal to
55.0 mm?
(a) 2.1 x 10⁴
g
(b) 4.3 x 10²
g
(c) 1.3 x 10³ g
(d) 1.4 g
(e) 2.3 x 10⁻²
,g - ANSWER -(c) 1.3 x 10³ g
**How many electrons are there in one ion of ²²⁶Ra²⁺?
(a) 86 e⁻
(b) 88 e⁻
(c) 226 e⁻
(d) 228 e⁻
(e) 140 e⁻ - ANSWER -(a) 86 e⁻
Which of the following scientists determined the mass and charge of an electron
by irradiating oil
droplets with X-Rays and observing their behavior?
(a) JJ Thomson
(b) Ernest Rutherford
(c) Marie Curie
(d) Robert Millikan
(e) Miley Cyrus - ANSWER -(d) Robert Millikan
What is the oxidation number of the phosphorous atom in the polyatomic ion,
phosphate (PO43-)?
(a) + 3
(b) - 3
(c) + 5
(d) + 1
(e) - 4 - ANSWER -(c) + 5
What is the chemical formula of perchloric acid?
(a) HCl
(b) CH₃COOH
(c) H₃PO₄
(d) HClO₄
(e) HClO₃ - ANSWER -(d) HClO₄
What is the name of the compound, NiBr2?
(a) Nickel (II) bromide
, (b) Nickel bromide
(c) Mononickel dibromide
(d) Nickel dibromide
(e) Nickel McBromide, the 2nd - ANSWER -(a) Nickel (II) bromide
What is the chemical formula of the compound, potassium permanganate?
(a) KMnO₂
(b) KMg
(c) KClO₄
(d) KMnO₄
(e) KMgO₂ - ANSWER -(d) KMnO₄
What is the likely chemical formula of the compound formed between silver and
nitrogen?
(a) AgN
(b) Ag₃N
(c) AgN₃
(d) Ag₂N₃
(e) Ag₃N₂ - ANSWER -(b) Ag₃N
16) Which of the following compounds exhibits polar covalent bonding?
(a) O₂
(b) CaBr₂
(c) PCl₅
(d) NaCl
(e) The Yeti that stole your Wheat Thins last night - ANSWER -(c) PCl₅
Which of the following statements about isotopes is false?
(a) All isotopes of the same element have the same number of protons
(b) Isotopes of the same element have different masses due to a different number
of neutrons
(c) Only one isotope of each element occurs naturally
(d) The atomic mass of an element on the periodic table is determined by
multiplying the mass of each
