Persistent behavior problems canaffect educational attainment, proper social development,employment, and the likelihood of criminality.The causes of childrenâs mental health problems arevaried and complex and include genetic makeup, childpoverty, maternal depression, and poor or abusivecare.
Paper chromatography is a technique for separating and identifying mixtures that are (or can be) coloured. It has been largely replaced by thin layer chromatography, but is still a powerful teaching tool. Double-way paper chromatography, also called 'two-dimensional chromatography', uses two solvents and rotates the paper 90Â° in between.
as described in the main chapter of this section in paper chromatography there is what is known as the stationary phase which is the absorbent chromatography paper and the mobile phase which is a liquid solvent or mixture of solvents used to carry the sample solutes under analysis along the paperue the fact that the solvent front is always larger from the distance travelled by the solute rf values are always between 0 one extreme where solute remains fixed at its origin and 1 the other extreme where the solute is so soluble that it moves as far as the solvent