Which of these processes indicates that smelting copper is a chemical change? it involves melting copper to form liquid metal. it involves heating charcoal to high temperatures. it involves drawing copper into long wires. it involves breaking molecular bonds between copper compounds.

It involves breaking molecular bonds between copper compounds.

Explanation: A physical reaction is defined as the reaction in which a change in shape, size takes place. No new substance gets formed in these reactions.

Example: melting copper, heating to high temperatures, drawing into wires

A chemical reaction is defined as the reaction in which a change in chemical composition takes place. A new substance is formed in these reactions.

Smelting is the process where metal is extracted from its ore by heating and melting. Smelting uses heat and a chemical reducing agent to decompose the ore, thus involves changes in molecular bonds and thus is chemical change.

vanderwaal's forces of attraction are the electrostatic intermolecular forces that exist in a molecule due to the temporary or permanent dipoles that are developed in a molecule. in , the major intermolecular forces are dipole-dipole interactions as the molecule is polar (bent structure). so the vanderwaal's forces of interaction in between molecules are the permanent dipole-dipole interactions that develop due to the dipole that exists in between the polar h - s bond. the positively charged hydrogen atom is attracted towards the negative end of the dipole that is sulfur of the adjacent molecule. therefore, these forces of attraction are relatively stronger than that of london dispersion forces that exist in non polar molecules.

clouds form

solid ice forms on leaves.

water droplets form on grass.