The building block of all matter is a) water b) oxygen c) an atom d) an element

What produces wave a)sound b) heats c)transfer of energy d)vibrations

How can a give a full method for the experiment of separating sand from water by filtration? 1-materials 2-steps 3-conclusion also for water and salt separated by the evaporation or distillation process

Estimate the molar mass of the gas that effuses at 1.6 times the effusion rate of carbon dioxide.