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A proton is approxomately (a) 200 times larger than electron (b) 2000 times larger than electron (c) 200 times smaller than electron (d) 2000 times smaller than electron (27) which are isotopes? An atom that has an atomic number of 34 and a mass isotope of an atom that has (a) an atomic number of 32 and a mass number of 76 (b) an atomic number of 34 and a mass number of 80 (c) 42 neutron and 34 protons (d) 42 protons and 34 neutrons
(A) What mass of Potassium hydrogen carbonate is needed? (B) What volume of 0.32 M HCl is needed to react completely with the amount of potassium hydrogen carbonate from 2(a)
Calculate the pKa of the second ionizable group of Z.
The enthalpies of formation of oxalic acid in the solid and aqueous phases are -826.8 and -818.8 kJ/mol, respectively. The heat capacity of water is 4.184 J/g*K. Ignore the heat capacity of oxalic acid.
a weather balloon with a 2-meter diameter at ambient temperature holds 525 grams of helium. what type of electronic
White phosphorus is a molecular solid made of molecules of P4. A 3.05 g sample of white phosphorus starts at 20oC. Calculate the amount of heat (in J) required to melt the sample.
Given that silicon and oxygen form a diatomic molecule of siO, write the orbital (electron) configuration for the molecule
Calculate the radiation dosage (in grays) for an 85-kg person that is exposed for 7.0 seconds to a 3.0 Ci source of beta radiation. Assume that 100% of the radiation is absorbed and each beta particle has an energy of 1.7× 10-13 J.
a student ran the following reaction in the laboratory at 310 k2 nog br2g 2 nobrgwhen she introduced 0.140 moles of
In a coffee-cup calorimeter, 1.50 g of NH4NO3 is mixed with 76.0 g of water at an initial temperature of 25.00°C. After dissolution of the salt, the final temperature of the calorimeter contents is 23.65°C.
explain why the swirling of a solution and its drying agent hastens the drying
microwave ovens use microwave radiation to heat food. the energy of the microwaves is absorbed by water molecules in
What kind of lipid forms when a glycerol combines with fatty acids through dehydration synthesis?
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