How would you use IR to distinguish between liquid bromine (Br2) and gaseous hydrogen bromide (HBr)? Explain.

How does chemistry affect our world? a. chemicals makes our world more polluted. b. chemicals keeps us healthy. c. chemicals can or hurt our world. d. chemicals make our world safe to live in.

Your friend offers to show you an intrusive igneous rock. which of the following would you expect to see?

Which part of earth’s surface receives the most direct rays from the sun? a) equator b) ocean c) poles d) mountains