Thermo Variables
Variable for the product of P and (delta)V
(delta)H
Energy associated with temperature of an object; a type of kinetic energy because it arises from motions of atoms or molecules within a substance.
Thermal energy
HClO4
perchloric acid
A 2+ ion has 48 electrons and 68 neutrons. What is its correct symbol?
118Sn2+
The periodic trend for atomic radius
decreases across a row and increases down a column
Variable for the action of a force through distance/heat at a constant volume
w
(delta)E is (positive or negative?) when energy flows into a system.
positive
HNO2
(T/F) The following set of quantum numbers can occur together to specify an electron in an orbital:
n=4, l=2, ml=-3, ms=+1/2
false
Write the correct electron configuration for Pb4+
[Xe]4f145d10
(delta)E of the system is equal to this variable
-(delta)E surroundings
Measure of heat exchanged under conditions of constant pressure.
(delta)H
HBr
Which wavelength on the electromagnetic spectrum has the shortest wavelength?
Calculate the % nitrogen by mass in ammonium carbonate.
29.16%
Variable for the internal energy of a system
E
positive (delta)H is (endothermic or exothermic?)
endothermic
CH3COOH
acetic acid
How many carbon atoms are in a 1.2-carat diamond? Diamonds are a form of pure carbon (1 carat = 0.20g)
1.2x1022 atoms
A sample of an organic compound is experimentally determined to contain 59.98% carbon, 8.055% hydrogen, and 31.96% oxygen by mass. The molar mass of the compound is about 500 g/mol. Find the molecular formula for the compound.
C25H40O10
Variable for heat, or energy transferred through heat
q
Everything with which a system can exchange energy.
Surroundings.
HI
hydroiodic acid
The naturally occurring isotopes of gallium are Ga-69 and Ga-71. The isotope Ga-69 has a mass of 68.9256 amu and a natural abundance of 60.11%. If the atomic mass of Ga is 69.72 amu, calculate the mass of Ga-71.
70.9171 amu
The general periodic trend for ionization energy.
Decreases down a column, increases across a row