You should know the location of safety equipment
in the laboratory and
1. use or test it once a month.
2. where it is produced.
3. use or test it once a week.
4. how to use it properly

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

The bond energy for the van der waals bond between two helium atoms is 7.9×10−4ev. assuming that the average kinetic energy of a helium atom is (3/2)kbt, at what temperature is the average kinetic energy equal to the bond energy between two helium atoms

Which of the following natural processes is most likely to support the formation of an underwater sinkhole? a pollution buildup from deposited minerals b limestone cave collapsing due to changes in sea level c erosion of large amounts of sand moved by ocean waves d oxidation of rock formed by chemical weathering