What is used to determine the number of a type of atom in a compound based on the chemical name? the periodic table chemical symbols prefixes the IUPAC

Why is alchemy not considered to be a science ?

How does convection affect our atmosphere? our layers of earth? our oceans?

Many machines- including inclined planes such as ramps- increase the strength of the force put into the machine but decrease the distance over which the force is applied. true or false