An asteroid floating through space was recently landed on by a NASA drone. The drone took a sample of the rock layers and found 1/32 of the original Rubidium-87 in the rock layer. The half-life of Rubidium-87 is 48.8 Billion year. How old is the rock?

Two liquids are poured into a beaker. after a few seconds, the beaker becomes warm. which of the following best describes this reaction? a. an exothermic reaction b. a decomposition reaction c. an endothermic reaction d. a single-displacement reaction