Please help me answer the questions on heat energy calculations on heating and cooling curves!

An exothermic reaction is conducted in an insulated calorimeter filled with water. the calorimeter is then sealed so that there is no heat exchanged between the contents of the container and the surrounding air. which of the following statements is true about the reaction?

What are scientists who study fossils called? ( a ) astronomers. ( b ) biologists. ( c ) geologists. ( d ) paleontologists.

An atom of which element reacts with an atom of hydrogen to form a bond with the greatest degree of polarity ?