The element krypton (symbol: Kr) has several radioactive isotopes. Here listed are several of these Isotopes along with their half lives: Kr-73, 27s;
Kr-74, 11.5 min; Kr-76, 14.8 h; Kr-81, 210,000 y. Which of the isotopes is
most stable and which of the isotopes is most radioactive? Explain your
answer.

The reaction q+r2=r2q is found to be first order in r2 and

The covalent compound acetylene, which is the fuel of the oxyacetylene torch used by welders, has the molecular formula c2h2. the covalent compound benzene, a commercial solvent, has the molecular formula c6h6 each of these covalent compounds contains carbon and hydrogen atoms in a one-to-one ratio. would it be correct to write the chemical formulas of each as ch? explain.

A650 ml sodium bromine solution has a bromide ion concentration of 0.245 m. what is the mass (g) of sodium bromide in solution? a) 103.b)0.00155.c)16400.d) 16.4.e) 0.159