12. Suppose something contained 37% parent material and 63% daughter material. How many half-lives have passed?
I

Hbr dissociates to form h+ and br-ca(oh)2 dissociates to form ca2+ and 2oh-the h+ and oh- react to form waterassuming the reactants are dissolved in water, the net reaction is h+ + oh- —> h2oif you’re asked to show all components of the reaction, the complete reaction is 2hbr + ca(oh)2 —> cabr2 + 2h2o

Depends on the speed of the car.

It must be measured in k.hope my answer is to you : )