The article deals with quantitatively oriented transversal diagnostics of pre-concepts of selected common concepts in physics and chemistry at primary schools and their genesis. The research was carried out in a sample of 60 pupils from the 5th class, 60 pupils from the 7th class and 60 pupils from the 9th class of selected primary schools in the Ústí nad Labem Region. The applied research methods were as follows: a questionnaire, didactic test, analysis of pupils´ tests and concept mapping. The objective was to monitor the affects of targeted school teaching of chemistry and physics on the creation of pre-concepts. The achieved results are discussed in terms of the possibility to integrate chemistry and physics teaching at primary schools.