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When the nuetron to proton ratio in a raditoactive isotope is higher than that required for stability, it main gain greater stability by emitting
1. neutron radiation
2. positron radiation
3. beta radiation
Emission of the following particle(s) has (have) a very small effect on the mass of an atom.
1. beta particle
2. neutron
3. alpha particle
A nucleus with an excess of neutrons would be expected to undergo nuclear decay by the emission of a
A. deutron
B. neutron
C. neutrino
D. beta particle
E. gamma ray
The ionization energy of an atom compared to the binding energy of its nucleus is
A. much greater
B. slightly greater
C. the same
D. slightly smaller
E. much smaller
What is the pH of the solution after 39.2 mL of NaOH have been added to the acid? Ka=1.3x10^-5
Assume that the density of the mixed solutions is 1.00 g/mL, that the specific heat of the mixed solutions is 4.18 J/(g celcius), and that no heat is lost to the surroundings. The deltaHrxn for the neutralization of NaOH with H2SO4 is -114 kJ/mol ..
A cylinder of helium has a volume of 8.00 L. The pressure of the gas is 388 lb in-2 at 25C. What volume will the helium occupy at standard atmospheric pressure (14.7 lb in-2) assuming there is no temperature change?
Suppose that 0.92 of water condenses on a 85.0 block of iron that is initially at 22. If the heat released during condensation goes only to warming the iron block, what is the final temperature (in ) of the iron block? (Assume a constant enthalpy ..
Geologists can estimate the age of rocks by their uranium-238 content. The uranium is incorporated in the rock as it hardens and then decays with first-order kinetics and a half-life of 4.5 billion years
A 0.456 gram sample of an unknown mono protic acid (let's call it HZ) was dissolved in some water (you pick the amount). Then the acidic solution was titrated to the equivalence point with 32.5 mL of 0.174 M KOH.
What is the heat of reaction (kJ) per mole of acid? Assume the mixture has a specific heat capacity of 4.18 J/(g·K) and that the densities of the reactant solutions are both 1.00 g/mL.
A cubic meter of a gravel-and-sand aquifer has been contaminated with 20 L of tetrachloroethylene. If the amount of tetrachloroethylene dissolved in aquifer water is 20 percent of its aqueous solubility,
whose temperature is 95 C and which contains 130g of liquid. Assume the specific heat capacity of the coffee is the same as that of water. The heat of fusion of ice
How many grams of liquid methanol (CH3OH) are needed to heat 425 mL of water from 18 oC to 43 oC by combustion with oxygen.
Equal quantities of 0.010M solutions of an acid HA and a base B are mixed. The pH of the resulting solution is 9.4. A) If Ka for HA is 9.0×10?5, what is the value of the equilibrium constant for the reaction between HA and B
Calculate delta E for the combustion of a gas that releases 195.0 kJ of energy to its surroundings and does 54.5 kJ of work on its surroundings.
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