Quantum Numbers
Thermochemistry
electron configurations
Enthalpy
Random
100
Identify the n, l, ml, and ms values for Te.
n = 5, l = 1, ml = -1, 0, 1, ms = -1/2, +1/2
100
If heat is being released, what is the sign of q? Is this endothermic or exothermic?
negative (-), exothermic
100
What is the element with an electron configuration of [Ar]4s23d6
Fe
100
When is enthalpy equal to heat energy (q)?
At constant pressure
100
Why are there two possible ms values?
Paul exclusion principle: the electrons must spin opposite ways in the orbital
200
What are the n, l, and ml values for an element in the 5d sub shell?
n = 5, l = 2, ml = -2, -1, 0, 1, 2
200
If the total energy of a solution is 822 J, and the work done by the system is 322 J, what is the heat energy of the solution?
1154 J
200
What is the electron configuration of In?
[Kr]5s24d105p1
200
The combustion of methane has an enthalpy change of -890.4 kJ. If 7 moles of CH4 combust, what is the enthalpy change?
CH4 + O2 = CO2 + 2 H2O
triangleH = -890.4 kJ
-10,684.8
200
Which atom will be larger:
F or O
O - atomic size decreases from left to right
300
Draw out the electron orbital diagram for Br.
300
Determine the final temperature of a 376g sample of gold that has an initial temperature of 398K and loses 4.850 kJ of heat when placed in snow. The specific heat capacity of gold is 0.128 J/goK.
297K
300
What is the electron configuration of Pb?
[Xe]6s24f145d106p2
300
What mass of Cl2 is required to release 45.2 kJ of energy as heat during the reaction between carbon and chlorine gas?
C (s) + 2 Cl2 (g) = CCl4 (l)
H = -135.4 kJ/mol
47.3 g
300
What element is the fluoride ion isoelectronic with?
Ne
400
What elements could have these characteristics:
n = 4
l = 0
ml = 0
K or Ca
400
Calculate the heat energy in kJ required to raise the temperature of 277 grams of aluminum from 25.0°C to 100.0°C. The specific heat capacity of aluminum is 0.897 J/g°C.
18.68 kJ
400
What element has an electron configuration of 1s22s22p63s23p64s23d104p65s24d105p3?
Sb
400
How much heat will be absorbed when 13.7g N2 react with excess O2?
N2 + O2 = 2 NO
triangle H = 180 kJ
88.03 kJ
400
357 kJ of heat flows out of the system during a reaction, and the system does 122 kJ of work on the piston during the reaction.
Is the reaction endothermic or exothermic? Did the piston move in or out? How much energy does the reaction absorb or release?
Exothermic, piston moves out, -479 kJ
500
What are the correct numbers for Ge:
1.) n = 3, l = 0, ml = 0
2.) n = 4, l = 1, ml = -1, 0, 1
3.) n = 4, l = 3, ml = -3, -1, 0, 1, 2, 3
2.) n = 4, l = 1, ml = -1, 0, 1
500
A 500.0 g block of iron is heated, and it absorbs 10,000 J of heat energy. If the specific heat capacity of iron is 0.449 J/g°C, what is the final temperature of the iron block if its initial temperature is 25.0°C?
69.46 degrees C
500
What is the electron configuration of Ba?
[Xe]6s2
500
A volume of 50.0 mL of 0.400 M HBr at 24.35 C is added to 50.0 mL of 0.400 M NaOH also at 24.35 C. The final temperature is 27.06 C. Calculate the enthalpy change in kJ/mol for the reaction.
-56.7 kJ/mol
500
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