How many of the following are true concerning balanced chemical equations? i. the number of molecules is conserved. ii. the coefficients for the reactants tell you how much of each reactant you are given. iii. atoms are neither created nor destroyed. iv. the coefficients indicate the mass ratios of the substances used. v. the sum of the coefficients on the reactant side equals the sum of the coefficients on the product side.

a chemical reaction happens

explanation:

intermolecular forces are the forces between molecules or particles.

there are two kinds of van der waals forces: weak london dispersion forces and stronger dipole-dipole forces.

in molecule of water there are dipole-dipole forces between negatively charged oxygen from one molecule of water and positively charger hydrogen of another molecule of water.

hydrogen bond is an electrostatic attraction between two polar groups that occurs when a hydrogen atom (h), covalently bound to a highly electronegative atom such as flourine (f), oxygen (o) and nitrogen (n) atoms.