Help ASAP Describe the change in the length of the figures shadow as you move from Dec 21st to June 21st.

The difference between the atomic number of an element and the element’s atomic mass is the number of ions.

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.

What three natural resources are found in the great lakes region