CHM 113 FINAL EXAM QUESTIONS &
ANSWERS CORRECT 100%
Which of the following substances is classified as a homogeneous mixture?
(a) A sample of solid bronze
(b) Orange juice with pulp
(c) A carbonated soda
(d) Pure H2O
(e) A mixture that is only legally recognized in 12 states - ANSWER(a) A sample of
solid bronze
What is the SI unit of length?
(a) inch
(b) centimeter
(c) meter
(d) mile
(e) kilometer - ANSWER(c) meter
The wavelength of a red laser pointer is 632.8 nanometers (nm). What is this
wavelength in
micrometers (µm)?
(a) 6.328 x 10⁻¹
µm
(b) 6.328 x 10⁵
µm
(c) 6.328 x 10⁻⁵
µm
(d) 6.328 x 10⁶
µm
(e) 6.328 x 10⁴
µm - ANSWER(a) 6.328 x 10⁻¹
µm
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 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 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 ²² ⁶Ra² ⁺?
(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
ANSWERS CORRECT 100%
Which of the following substances is classified as a homogeneous mixture?
(a) A sample of solid bronze
(b) Orange juice with pulp
(c) A carbonated soda
(d) Pure H2O
(e) A mixture that is only legally recognized in 12 states - ANSWER(a) A sample of
solid bronze
What is the SI unit of length?
(a) inch
(b) centimeter
(c) meter
(d) mile
(e) kilometer - ANSWER(c) meter
The wavelength of a red laser pointer is 632.8 nanometers (nm). What is this
wavelength in
micrometers (µm)?
(a) 6.328 x 10⁻¹
µm
(b) 6.328 x 10⁵
µm
(c) 6.328 x 10⁻⁵
µm
(d) 6.328 x 10⁶
µm
(e) 6.328 x 10⁴
µm - ANSWER(a) 6.328 x 10⁻¹
µm
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 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 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 ²² ⁶Ra² ⁺?
(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
