What clouds are best associated with thunderstorms?

Bonds within one water molecule are examples of

The radioactive isotope of lead, pb-209, decays at a rate proportional to the amount present at time t and has a half-life of 3.3 hours. if 1 gram of this isotope is present initially, how long will it take for 80% of the lead to decay? (round your answer to two decimal places.)

While preforming an experiment involving a reaction between two chemicals the scientist observes that the reaction container has become warm the observation is an example of