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The sodium isotope,^21,11 Na,with a half-life of 23s,undergoes decay by emitting a positron.write the complete nuclear reaction.
Iodine-131 has a half-life of 8.0 days. If a person ingests 2.5 mg of NaI labeled with iodine-131, how much of the radioactive isotope remains in the body after 30. days
understanding of chemistry basics.1. the relative concentrations of reactant and product found when a reaction reaches
What kinetic energy must the electrons have in order to resolve a protein molecule that is 5.10 nm in diameter? Take the mass of an electron to be 9.11× 10-31 kg.
Mixed 1.15g of Na2HPO4 (MW=142g/mol) and 2g NaH2PO4 (MW=138 g/mol) in 1L of water. What is the concentration of your buffer and what is the pH
Write a balance equation using the correct formulas and including conditions (s, l, g, or aq) for each of the following reactions: a) solid calcium carbonate decomposes to produce solid calcium oxide and carbon dioxide gas. b) Nitrogen oxide gas r..
What volume of 1 M NaOH would you need to add to 200 mL of 0.2 M acetic acid solution to achieve a pH of 7.0 (the pKa of acetic acid is 4.76)? A)0.23 mL B)6.952 mL C)173.8 mL D)39.77 mL
1. what characteristic properties distinguish the transition elements from the group ia and-iia metals?2. name these
A reaction with the activation energy Ea= 219.00 kJ/mol, has a rate constant k = 2.400 x 101 at 565.00 Kelvin. Determine the rate constant when the temperature is changed to 861.00 Kelvin. R = 8.314 J K-1mol-1
a 486 ml sample of water was cooled from 50.0acircdegc to 10.0acircdegc. assuming a specific heat of 4.184 jk g and a
An open end manometer constructed from a U-shaped tube was operated using an oil which has a density of 1.088 g ml-1. In a particular measurement, the level in the end connected to the gas manifold, on which the experiment was being conducted, mea..
Please show your work, and I will rate you! TWO PART QUESTION A)What is the rate constant of a first-order reaction that takes 277seconds for the reactant concentration to drop to half of its initial value
The Wittig reaction involves coupling between a phosphonium ylide and a carbonyl-containing molecule. If a chemist wants to use the Wittig reaction to synthesize 2-methyl-2-butene, which reactants should be used?
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