1. Which phase changes need energy to occur? 2. Which phase changes lose energy as they occur?

Which compound contains both ionic and covalent bonds? a) hbr b)cbr4 c)nabr d) naoh

In an investigation that uses the scientific method, which step immediately follows making a hypothesis? o summarizing the results o asking a question o making observations designing an experiment mark this and retum save and exit next submit

Ascientist measures the speed of sound in a monatomic gas to be 449 m/s at 20∘c. what is the molar mass of this gas?