Energy
Energy that is associated with the relative motions of electrons and nuclei in atoms and molecules is called...
Kinetic energy
Which of the following processes is endothermic?
-A) A hot cup of coffee (system) cools on a countertop
-B) The chemical reaction in a "hot pack" often used to treat sore muscles.
-C) The combustion of propane.
-D) The vaporization of rubbing alcohol.
D
Give the ground state electron configuration for Br-
(Use noble gasses!)
A) [Ar]4s^2 3d^10 4p^6
Give the electron configuration for the element with 16 protons
1s^2 2s^2 2p^6 3s^2 3p^4
or
[Ne] 3s^2 3p^4
Place the following types of electromagnetic radiation in order of increasing frequency.
visible light microwaves X-rays
microwaves < visible light < X-rays
Which of the following signs on q and w represent a system that is doing work on the surroundings, as well as gaining heat on the surroundings?
q= +, w+ -
Which reaction below represents the electron affinity of Li?
A) Li(g) + (e-)-->Li+ (g)
B) Li(g) +( e-)-->Li-(g)
C) Li(g)-->Li+(g)+ (e-)
D) Li+(g)-->Li(g) + (e-)
B
Each of the following sets of quantum numbers is supposed to specify an orbital. Which of the following sets of quantum numbers contains an error?
A) n = 4, l = 2, ml =0
B) n = 3, l = 0, ml =0
C) n = 1, l = 0, ml =0
D) n = 3, l =3 , ml = -2
How much energy is required to decompose 765 g of PCl3, according to the reaction below? The molar mass of
PCl3 is 137.32 g/mol and may be useful.
Use the information provided to determine H°rxn for the following reaction: H°f (kJ/mol) CH4(g) + 4 Cl2(g) CCl4(g) + 4 HCl(g) H°rxn= ?
CH4(g) -75
CCl4(g) -96
HCl(g) -92
-389 kJ
Place the following in order of increasing radius.
Ca2+ S2- Cl-
Ca2+ < Cl- < S2-
Which of the following transitions (in a hydrogen atom) represent emission of the longest wavelength photon?
A) n = 4 to n = 2
B) n = 3 to n = 1
C) n = 5 to n = 4
D) n = 3 to n = 4
C
Calculate the change in internal energy ( E) for a system that is giving off 25.0 kJ of heat and is changing from
12.00 L to 6.00 L in volume at 1.50 atm pressure. (Remember that 101.3 J = 1 L·atm)
- 24.1 kJ
Choose the reaction that represents H°f for Ca(NO3)2.
A) Ca(NO3)2(aq)--->Ca2+(aq) + 2 NO3-(aq)
B)Ca(s) + 2 N(g) + 6 O(g)--->Ca(NO3)2(s)
C) Ca(s) + N2(g) + 3O2(g)-->Ca(NO3)2(s)
D)Ca2+(aq) + 2 NO3-(aq)-->Ca(NO3)2(aq)
C
Give the set of four quantum numbers that represent the last electron added (using the Aufbau principle) to the Cl atom
(n, l, ml, ms)
n = 3, l =1 , ml = 0, ms = - 1
Calculate the frequency of the green light emitted by a hydrogen atom with a wavelength of 486.1 nm.
6.17 × 10^14 𝑠−1