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A radioactive isotope may change a proton into a neutron in an attempt to become more stable. While doing so, a particle is emitted from the nucleus of that isotope. This conversion can occur via two different processes. Select the choices that show these conversions.
1. Alpha emission
2. Positron emission
3. Beta emission
4. Electron capture
5. Neutron emission
A gaseous mixture contains 420.0 Torr of H2(g), 391.3 Torr of N2(g), and 79.5 Torr of Ar(g). Calculate the mole fraction, X, of each of these gases.
If you prepare a 1.00 m solution of NH4ClO4 beginning with water at 25.5C, what is the final temperature of the solution in C?
A mixture of 6.0 mol of H2(g) and 3.0 mol of O2(g) is placed in a sealed evacuated container made of a perfect insulating material at 27 C. The mixture is ignited with a spark and it reacts to form liquid water. Find the temperature of the water.
If you wanted to prepare a 1.45 L buffer with a total phosphate concentration of 0.0500 M, how many grams of NaH2PO4 and Na2HPO4 would you mix together? How many grams of conjugate acid do you need? How many grams of conjugate base do you need?
A 2.50-g sample of a large biomolecule was dissolved in 37.0 g of carbon tetrachloride. The boiling point of this solution was determined to be 77.85°C.
iodized salt is a mix of NaCl and KI. if the content of 75 ppm what is the iodine content?
What is the frequency of ultraviolet light with wavelength 2.51 × 10-8 m? (c = 3.00 × 108 m/s)
nknown gas effuses in 11.0 min. An equal volume of H2 in the same apparatus under the same conditions effuses in 2.56 min. What is the molar mass of the unknown gas
how much acetone (CH3COCH3) would be needed to obtain 3.35 moles of acetone? the desnity of acetone is 0.851 g/mL.
Al(OH)3 + 3HCl ---> AlCl3 + 3H2O Determine the moles of acid neutralized if a tablet contains 0.200 mol Al(OH)3
The mass of a cube of iron is 392 g. Iron has a density of 7.87 g/cm3. What is the mass of a cube of lead that has the same dimensions?
can a liquid be identified by the same principl(e.g. mixing an unknown liquid with known liquid) and determining if the boiling point of the mixture is depessed if the two liquids are different?
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