In the beta decay reaction: , determine the times required for the number of original atoms to be reduced by 25, 50 and 75%, given the half-life of Pb214 is 26.8 minutes. In the beta decal reaction,  is the neutrino that results from the reaction.

What is the ph of a solution with a 1.50 × 10−9 m hydroxide ion concentration?

Abullet found at a crime scene may be used as evidence in a trial if the percentage of metals match to the composition of metals in a bullet from the suspect's ammunition. a forensic scientist's analysis of the bullet shows that it contains 11.9 g of lead, 0.5 g of tin, and 0.8 b of antimony. what is the percentage of lead metal in the bullet? express your answers to the one's place.

Which of the following statements about acidic water is true? a. acid has no effect on the h,o molecules. b. the solution contains a larger number of oh ions than h,o ions. c. the solution contains a larger number of h,o ions than qh ions. d. the solution contains an equal number of h,o ions and oh ions. none of the above e.