Nuclear Chemistry
Half-Life
Equilibrium
Gas Laws
Acid Base Chemistry
100
This particle is emitted as an electron.
What is a beta particle 0-1e?
100
The average time it takes for half the amount of a radioactive element to decay.
What is the half-life of a radioactive isotope?
100
Calculate Keq for the equation,
2NO2 (g) <--> N2O4 (g)
NO2= .500M
N2O4= .025M
Keq = .100
100
A student has a 2.0 liter flask of gas at 35oC and 198 atm. If the student cools the flask to 15oC, determine the new pressure in the flask in atm.
P1=198 atm
T1=35oC=308K
P2= ?
T2=15oC=288K
P1/T1=P2/T2
198atm/308K = P2/288K
P2=185atm
100
This is the pH range of an acid.
What is 0-7?
200
Type of decay & element formed from this reaction:
22688Ra → 42He + _____
What is alpha decay & 22286Rn
200
Thorium-234 has a half-life of 24 days. It started with 100 g, but after this amount of time, it now has 25 grams remaining.
What is 48 days?
200
Increasing the pressure on the following reaction will cause a shift in this direction.
2SO2(g) + O2(g) ⇄ 2SO3(g)
What is a shift to the RIGHT (towards products).
200
A sealed 2.5 liter flask contains a gas sample that exerts 140 kPa at 10oC. Determine the pressure exerted by the gas if the flask is heated to 60oC.
P1=140 kPa
T1=10oC=283K
P2= ?
T2=60oC=333K
P1/T1=P2/T2
140kPa/283K = P2/333K
P2=165 kPa
200
This is the formula for finding pH if given pOH
What is 14-pOH
300
The process in which two nuclei are forced together by high temperatures, resulting in the release of energy, neutrons and a heavier element atom.
What is fusion?
300
100 g of Plutonium-239 has a half-life of 24,110 years. This amount still remains after 96,400 years?
What is 6.25 grams?
300
Calculate Keq
C6H12O6(s) + 6O2(g) <--> 6H20(g) + 6CO2 (g)
O2=.0150M
H2O=.0250M
CO2=.0150M
Keq = 2.44 x 10-10
300
A student has 4.0 moles of gas. Determine the volume of the gas sample at 40oC and 2.5 atm.
PV=nRT
(2.5atm)(V)=(4mol)(0.0821 Latm/molK)(313K)
V=0.024L
300
This is the pH if the H+ is 0.0001 M.
What is 4.0?
400
The process in which a large nucleus is split by a neutron bombardment. The products include more neutrons, energy, and two smaller element atoms.
What is fission?
400
15.0 mg of Radium-266 has a half life of 1599 years. This amount remains after 6369 years.
What is 0.94 mg?
400
Removing products of a system at equilibrium will shift the reaction in this direction.
What is a shift to the RIGHT (towards products).
400
A student is synthesizing water from its elements according to the following equation:
2H2+O2 --> 2H2O
If the student begins with 6.0 liters of hydrogen gas at 1.73 atm and 200.K, how many grams of water vapor can be produced at the same temperature and pressure?
Given: 6L H2 NOT at STP
L H2 x (1mol/22.4L)x(2molH2O/2moleH2) x (18g/1mol) = g
400
This is the pH if the [OH-] is 2.3 x 10-7
What is 7.4?
500
This reaction will result in beta particles being emitted by K-21.
What is 2119 K -> 2120 Ca + 0-1 e
500
Thorium-227 has a half-life of 16 days, it takes this many days for three-fourths to decay.
What is 32 days?
500
2 NO2 (g) <--> N2O4 (g) + heat
How would the system respond (shift) if the volume was increased?
System would shift to left (side with more moles of gas) in response to decreased pressure. This would result in an increase in the amount of NO2.
500
A mixture of chemicals we are using for a chem lab, CO2, H2, N2, O2 has a total pressure of 29.82 atm. If CO2 is 5.65 atm, H2 is 8.45 atm, N2 is 11.03 atm, then what is the partial pressure of O2?
4.96 atm
500
This is the [H+] if pH is 3.400
What is 3.98 x 10-4 M?