Which event always involves a chemical change? boiling
melting
conducting
burning
I will make first awser brainlist.

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 is the standard unit of measure for acceleration?

Drug abuse will not lead to physical and psychological dependence. true or false ?