1. lodine-123 is used to study thyroid gland function. This radioactive isotope breaks down in a first-order process with a half life of 13.1 hr. What is the rate constant for for the process?

Evaluate this exponential expression,8. (2 + 3)2 – 42

If we compare and contrast electromagnetic waves with sound waves, all but one statement is true. that is a) sound waves require a medium to travel while electromagnetic waves do not. b) electromagnetic waves can travel through the vacuum of space while sound waves cannot. c) electromagnetic waves must have a medium in which to travel, but sound waves can travel anywhere. eliminate d) sound waves must bounce off of matter in order to travel while electromagnetic waves do not require matter to be present.

Calculate the mass of carbon in 97.0 g of sucrose c12h22o11