CHM 113 FINAL STUDY QUESTIONS &
ANSWERS CORRET 100%
How many hydrogen atoms are in 29 molecules of diborane, B₂H₆? - ANSWER174
Predict the chemical formula for the ionic compound formed by Cu²⁺ and P³⁻ -
ANSWERCu3P2
Balance the following chemical equation (if necessary): MnO2 (s) + HCl (aq) ->
MnCl2 (aq) + H2O (l) + Cl2 (g) - ANSWERMnO2 (s) + 4 HCl (aq) -> MnCl2 (aq) + 2
H2O (l) + Cl2 (g)
The following picture would be best described as - ANSWERA gaseous compound
Which of the following is a physical change? - ANSWERTearing a piece of paper
Determine the formula weight of SrCl₂. Provide an answer to two decimal places. -
ANSWER158.52 amu
Balance the following chemical equation (if necessary): H2SO4 (aq) + Pb(OH)4 (s) -
> Pb(SO4)2 (s) + H2O (l) - ANSWER2 H2SO4 (aq) + Pb(OH)4 (s) -> Pb(SO4)2 (s) +
4 H2O (l)
What is the mass number for an atom of zinc containing 30 protons and 36
neutrons? - ANSWER66
What is the mass percentage of Na in NaNO₃? Provide an answer to two decimal
places. - ANSWER27.04%
A chemist encounters an unknown metal. They drop the metal into a graduated
cylinder containing water, and find the volume change is 4.1 mL. If the metal weighs
5.1 g, what is the density of the metal in g/mL? - ANSWER1.2 g/mL
In the reaction between HNO₃ and Ba(OH)₂ (assume complete reaction of the
Ba(OH)₂), the spectator ions are
A) Ba²⁺ and NO₃⁻
B) H⁺ and NO₃⁻
C) H⁺ and OH⁻
D) Ba²⁺ and OH⁻ - ANSWERA) Ba²⁺ and NO₃⁻
An unknown element X has the following isotopes: ²⁵X (80.50% abundant, mass =
25.03 amu) and ²⁷X (19.50% abundant, mass = 26.98 amu). What is the average
atomic mass of X in amu? - ANSWER25.40 amu
Which of the following is an example of an empirical formula?
A) C2O2H2
, B) C4H8
C) C7H14Cl2
D) C6H9O3
E) C8H10 - ANSWERC) C7H14Cl2
The answer to the calculation below with the correct number of significant figures is
0.0180-0.0059/0.03168 - ANSWER0.382
Which element is classified as a halogen?
A) Cl
B) O
C) S
D) Ar - ANSWERA) Cl
Complete the balanced neutralization equation for the reaction below:
HNO3 (aq) + Ba(OH) 2 (aq) -> - ANSWER
A compound containing Na, C, and O is found to have 1.06 mol Na, 0.528 mol C,
and 1.59 mol O. What is the empirical formula of the compound?
A) NaCO
B) Na₂CO
C) Na₂CO₂
D) Na₂CO₃ - ANSWERD) Na₂CO₃
What is the wavelength (in nm) of blue light that has a frequency of 6.53 × 10¹⁴ s⁻¹?
(c = 3.00 × 10⁸ m/s) - ANSWER459 nm
What is the wavelength (in nm) of blue light that has a frequency of 6.53 × 10¹⁴ s⁻¹?
(c = 3.00 × 10⁸ m/s) - ANSWER4.94 × 10⁻¹⁹ J
What is the energy, in J, of light that must be absorbed by a hydrogen atom to
transition an electron from n = 3 to n = 5? Submit an answer to three signficant
figures. - ANSWER1.55 × 10⁻¹⁹ J
Write the chemical formula for sulfuric acid - ANSWERH2SO4
Convert 15.4 inches to meters. (2.54 cm = 1 inch) - ANSWER0.391 m
Which of the following temperatures is the coldest?
A) 100 K
B) 100 °C
C) 100 °F - ANSWERA) 100 K
Classify the type of reaction is represented by the following equation: BaCl₂(aq) +
Na₂SO₄(aq) → BaSO₄(s) + 2 NaCl(aq)
A) synthesis
B) decomposition
C) double displacement
ANSWERS CORRET 100%
How many hydrogen atoms are in 29 molecules of diborane, B₂H₆? - ANSWER174
Predict the chemical formula for the ionic compound formed by Cu²⁺ and P³⁻ -
ANSWERCu3P2
Balance the following chemical equation (if necessary): MnO2 (s) + HCl (aq) ->
MnCl2 (aq) + H2O (l) + Cl2 (g) - ANSWERMnO2 (s) + 4 HCl (aq) -> MnCl2 (aq) + 2
H2O (l) + Cl2 (g)
The following picture would be best described as - ANSWERA gaseous compound
Which of the following is a physical change? - ANSWERTearing a piece of paper
Determine the formula weight of SrCl₂. Provide an answer to two decimal places. -
ANSWER158.52 amu
Balance the following chemical equation (if necessary): H2SO4 (aq) + Pb(OH)4 (s) -
> Pb(SO4)2 (s) + H2O (l) - ANSWER2 H2SO4 (aq) + Pb(OH)4 (s) -> Pb(SO4)2 (s) +
4 H2O (l)
What is the mass number for an atom of zinc containing 30 protons and 36
neutrons? - ANSWER66
What is the mass percentage of Na in NaNO₃? Provide an answer to two decimal
places. - ANSWER27.04%
A chemist encounters an unknown metal. They drop the metal into a graduated
cylinder containing water, and find the volume change is 4.1 mL. If the metal weighs
5.1 g, what is the density of the metal in g/mL? - ANSWER1.2 g/mL
In the reaction between HNO₃ and Ba(OH)₂ (assume complete reaction of the
Ba(OH)₂), the spectator ions are
A) Ba²⁺ and NO₃⁻
B) H⁺ and NO₃⁻
C) H⁺ and OH⁻
D) Ba²⁺ and OH⁻ - ANSWERA) Ba²⁺ and NO₃⁻
An unknown element X has the following isotopes: ²⁵X (80.50% abundant, mass =
25.03 amu) and ²⁷X (19.50% abundant, mass = 26.98 amu). What is the average
atomic mass of X in amu? - ANSWER25.40 amu
Which of the following is an example of an empirical formula?
A) C2O2H2
, B) C4H8
C) C7H14Cl2
D) C6H9O3
E) C8H10 - ANSWERC) C7H14Cl2
The answer to the calculation below with the correct number of significant figures is
0.0180-0.0059/0.03168 - ANSWER0.382
Which element is classified as a halogen?
A) Cl
B) O
C) S
D) Ar - ANSWERA) Cl
Complete the balanced neutralization equation for the reaction below:
HNO3 (aq) + Ba(OH) 2 (aq) -> - ANSWER
A compound containing Na, C, and O is found to have 1.06 mol Na, 0.528 mol C,
and 1.59 mol O. What is the empirical formula of the compound?
A) NaCO
B) Na₂CO
C) Na₂CO₂
D) Na₂CO₃ - ANSWERD) Na₂CO₃
What is the wavelength (in nm) of blue light that has a frequency of 6.53 × 10¹⁴ s⁻¹?
(c = 3.00 × 10⁸ m/s) - ANSWER459 nm
What is the wavelength (in nm) of blue light that has a frequency of 6.53 × 10¹⁴ s⁻¹?
(c = 3.00 × 10⁸ m/s) - ANSWER4.94 × 10⁻¹⁹ J
What is the energy, in J, of light that must be absorbed by a hydrogen atom to
transition an electron from n = 3 to n = 5? Submit an answer to three signficant
figures. - ANSWER1.55 × 10⁻¹⁹ J
Write the chemical formula for sulfuric acid - ANSWERH2SO4
Convert 15.4 inches to meters. (2.54 cm = 1 inch) - ANSWER0.391 m
Which of the following temperatures is the coldest?
A) 100 K
B) 100 °C
C) 100 °F - ANSWERA) 100 K
Classify the type of reaction is represented by the following equation: BaCl₂(aq) +
Na₂SO₄(aq) → BaSO₄(s) + 2 NaCl(aq)
A) synthesis
B) decomposition
C) double displacement
