Iodine-131 decays with a half-life of 8.02 d. in a sample initially containing 5.00 mg of 131i, what mass remains after 6.01 d

0.09 moles of sodium sulfate in 12 ml of solution

An atom's configuration based on its number of electrons ends at 3p4. another atom has seven more electrons. starting at 3p, what is the remaining configuration? 3p63d34s2 3p43d54s2 3p64s23d3 3p44s23d

Which statement is true about a catalyst? a: a catalyst decreases the rate of the reaction. b. a catalyst is consumed during a chemical reaction. c. a catalyst lowers the activation energy of a reaction. d. a catalyst increases the reactant concentration during a reaction.