Aradioactive isotope of potassium (k) has a half-life of 20 minutes. if a 36 gram sample of this isotope is allowed to decay for 80 minutes, how many grams of the radioactive isotope will remain?

clouds form

solid ice forms on leaves.

water droplets form on grass.

dynamic equilibrium is the answer.

substituting a hydrogen atom with a halogen in a hydrocarbon:

- the single bond remains single. a is wrong.

- the bond with hydrogen is as strong as with a halogen. c is wrong

- a hydrocarbon is saturated if there is no double bond. we do not know that so d is wrong.

- carbon will always have four valence electrons. e is wrong.

by elimination, the correct answer is b. the boiling point of the new compound increases.

answerto predict;