During the cold winter months the surface of a lake becomes hard ice this is due to which change of state

How much energy moves onto the next level, in an energy pyramid

The covalent compound acetylene, which is the fuel of the oxyacetylene torch used by welders, has the molecular formula c2h2. the covalent compound benzene, a commercial solvent, has the molecular formula c6h6 each of these covalent compounds contains carbon and hydrogen atoms in a one-to-one ratio. would it be correct to write the chemical formulas of each as ch? explain.

Compare and contrast the bohr model and the electron cloud models of the atom.