Describe the process that early periodic table organizers used to try and put elements into some sort of order

Aplane travels 1000 miles in 5 hours .what is the planes average speed?

Ways that industry and agriculture use physical properties to separate substances

Atank has a shape of a cone with a radius at the top of 2 m and a height of 5 m. the tank also has a 1 m spout at the top of the tank. the tank is filled with water up to a height of 2 m. find the work needed to pump all the water out the top of the spout. (use 9.8 m/s2 for g and the fact that the density of water is 1000 kg/m3.)