A drop of liquid bromine is placed in the bottom of a gas jar. Brown fumes of bromine vapour slowly spread through the covered gas jar.
Why does this happen?
A: Bromine vapour is less dense than air.
B: Bromine molecules and the molecules in air are always moving around.
C: Bromine molecules are smaller than the molecules in air.
D: Bromine molecules move faster than the molecules in air.

The climate of the continental united states is generally 1. tropical 2. temperate 3. arctic 4. highland

Essay-alternative energy sources research sources of energy that are being developed. write a report of 350-400 words discussing the information you learned concerning the development of various energy sources and the impact that you think they will have on your life. include sources cited at the end of your report using the mla format. follow the rubric guidelines. note that wikipedia is not an appropriate resource for a research paper. worth 99

The diagram shows the relationship between scientific disciplines.the names of some scientific disciplines have been removed from the boxes. which scientific discipline belongs in the blue box? a.physics b.biology c.chemistry d.metallurgy