A menudo se recomienda que deje que el motor de su automóvil funcione al ralentí para calentarse antes de conducir, especialmente en los fríos días de invierno. Si bien el beneficio del ralentí prolongado es dudoso, es cierto que un motor caliente es más eficiente en el consumo de combustible que uno frío. Explique la razón de esto. Respuesta

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.

the atomic mass is the bottom number on the element.

-steel jelly

i just learnt this recently but i need to look through my notes again