CHM 1045 Ch. 5-7
What is the subshell, in which electrons are found to have quantum numbers, n = 2, l = 1?
2p
Consider a large number of hydrogen atoms with electrons randomly distributed in the n = 1, 2, and 3 orbits. How many different wavelengths of light are emitted by these atoms as the electrons fall into lower-energy orbitals?
3
If a shell contains a maximum of 18 electrons, what is the principal quantum number?
3
An LED emits a photon with an energy of 2.5 eV. What is the wavelength of the photon being emitted? (Planck's constant: h = 6.626 × 10-34 J⋅s and 1 eV = 1.602 × 10-19 J)
496 nm
What is the subshell, in which electrons are found to have quantum numbers, n = 4, l = 2?
4d
What is the heat capacity of 630 g Aluminum metal (specific heat 0.9 J / ( g ⋅ °C ) )? 700 J / °C 567 °C / J 700 °C / J 567 J / °C
567 J / °C
It takes 40,000 J of energy to raise the temperature of a pan (1.6 Kg) by 50 °C. What is the heat capacity of this pan?
800 J / °C
What is the enthalpy of combustion of propane, C3H8(g), for the formation of H2O(g) and CO2(g), from the following data? C(s) + O2(g) ⟶ CO2 (g) ΔHfo = -394 KJ/mol H2(g) + 1/2 O2(g) ⟶ H2O (g) ΔHfo = -242 KJ/mol 3C(s) + 4H2(g) ⟶ C3H8 (g) ΔHfo = -104 KJ/mol
-2046 KJ mol^-1
Which of the following is a covalent compound? SiC MgS Al2O3 CaO
SiC
Which of the following is an intensive property of a substance? Kinetic Energy Enthalpy Specific heat Potential Energy
Specific heat
Which of the following involves an exothermic process? Melting ice cubes Starting a gas oven Instant cold pack Mixing water and ammonium nitrate
Starting a gas oven
Which of the following has the longest wavelength? FM Radio Infrared light X-Rays UV light
FM Radio
Which of the following statements is correct? Most ionic and covalent compounds are good conductors of electricity. Both electron affinity and electronegativity could be measured experimentally. Most ionic and covalent compounds are electrically neutral. Most ionic and covalent compounds are soluble in water.
Most ionic and covalent compounds are electrically neutral.
Which of the following compound does not have resonance structures? N2O SO2 HCO3- NO2-
N2O
Which of the following contains a double bond? Cl2 NO- N2 C2H2
NO-
Which of the following has the largest atomic radius? O F Na Li
Na
Which of the following is not an isoelectronic species in reference to the other three? Ca2+ Cl- Ne P3-
Ne
Which of the following does not contain a triple bond? O2 CO CN- C2H2
O2
"What is ΔH298 for the process, 3Co (s) + 2O2 (g) →Co3O4 (s) from the following data? Co(s) + 1/2 O2(g) →CoO (s) ΔH298 = -237.9 KJ 3CoO (s) + 1/2 O2(g) →Co3O4 (g) ΔH298 = -177.5 KJ
-891.2 KJ
What is the formal charge of P in PO3^3-?
0
A piece of metal weighs at around 0.2 kg. When the metal piece is heated to have its temperature increase from 20 oC to 60 oC, it absorbs 2000 J of heat. What is the specific heat of this metal?
0.25 J/g oC
A piece of metal alloy with a specific heat of 0.5 J / ( g ⋅ oC ) is cooled down from 150 oC to 50 oC to release 5 KJ of heat. What is the mass of this piece of metal alloy?
100 g
Methanol, CH3OH, could decompose into carbon monoxide, CO, and hydrogen, H2. What is the approximate enthalpy change of this reaction? (Bond Energies: CO, 1080 KJ/mol; H-H, 436 KJ/mol; C-H, 415 KJ/mol; C-O, 350 KJ/mol; O-H, 464 KJ/mol)
107 KJ
What is the electron configuration of Cl?
1s^2 2s^2 2p^6 3s^2 3p^5
An FM radio station broadcasts at a frequency of 90 MHz (9.0 x 107 s-1). What is the wavelength of these radio waves in meters?
3.33 m
An FM radio station broadcasts at a frequency of 90 MHz. What is the wavelength of these radio waves in meters?
3.33 m
A LED emits light with a wavelength of 530 nm. What is the energy of the photon being emitted? (Planck's constant: h = 6.626 × 10-34 J s)
3.75 x 10^-19 J
A 50 g piece of metal alloy was heated to 100 o C and then dropped into a beaker containing 70 g of water at 25 oC. The specific heat capacities of this metal alloy and water are 0.418 and 4.18 J/(g⋅oC) respectively. These systems are isolated and maintained at the constant volume condition. What is the final temperature, when the water and the metal reach their thermal equilibrium?
30 oC
A piece of metal (100 g, specific heat of 0.42 J / ( g ⋅ oC) ) at 220 oC was dropped into a beaker containing 190 g of water (specific heat capacity of 4.2 J / ( g ⋅ oC ) ) at 20.0 oC. The system is isolated and maintained at the constant volume condition. What is the final temperature?
30°C
Which of the following has the highest first ionization energy? Si B C Al
C
Which of the following has the lowest electronegativity? F C O N
C
Which of the following compounds requires the most energy to convert one mole of the solid into separate ions? CaO K2O K2S CaS
CaO
Which of the following is an extensive property of a substance? Density Enthalpy Temperature Specific Heat Capacity
Enthalpy
Which of the following has the most negative electron affinity value? (greatest affinity to electrons) F Li C B
F
Which of the following about the bond strength comparison is NOT correct? C-Cl is stronger than C-Br H-S is stronger than H-Cl N=N is stronger than N-N N-F is stronger than N-P
H-S is stronger than H-Cl
Which of the following has the lowest energy? X-ray Microwave radiation Infrared light Blue light
Microwave radiation
Which of the following involves an endothermic process? Mixing ammonium nitrate with water Starting a gas oven Lighting a match Ice cubes freezing
Mixing ammonium nitrate with water
Which of the following is NOT one of the four quantum numbers? Magnetic quantum number Principle quantum number Orbital quantum number Angular momentum quantum number
Orbital quantum number
What is the electron configuration of Cl+ ?
[Ne]3s²3p⁴
What is the shape of a p orbital?
dumbbell