The activity of a radioactive sample is the number of nuclear disintegrations per second, which is equal to the first order rate constant times the number of radioactive nuclei present. the fundamental unit of radioactivity is the curie (Ci) where 1Ci corresponds to exactly 3.7x10^10 disintegrations per second. this decay rate is equivalent to that of 1g of radium-226. Calculate the rate constant and half life for the radium decay. starting with 2.6g of the radium sample, what is the activity after 450yr? The molar mass of Ra is 226.03 g/mol.

Jose and eric were given four samples in lab. the results of their analysis are shown in the table. based on the data they collected, which sample is most likely a metal?

Bridget is in science class. her teacher gives her two unknown substances and asks her to determine their relative ph. she places a piece of red litmus paper into both substances. the litmus paper turns purple when she places it into substance i. the litmus paper turns blue when she places it into substance ii. a. substance i is a neutral substance and substance ii is an acid. b. substance i is a neutral substance and substance ii is a base. c. substance i is an acid and substance ii is a base. d. substance i is a base and substance ii is a neutral substance.

Explain why a catalyst does not increase the amount of product that can form