question 7

A group of learners prepare a 0,25 mol∙dm-3 solution of sodium carbonate by dissolvinga 14,2 g sample of hydrated sodium carbonate (Na2CO3∙xH2O) in 200 cm3 of water. 7.1 Explain the meaning of the term hydrated. (1) 7.2 Write down a BALANCED CHEMICAL EQUATION to show how sodium carbonate dissociates in water. (2) 7.3 Learners then … Read more

Experiments were done to investigate the effect of temperature on the speed of sound.One person beat a drum while another person, who was standing 50 m away from thesound source, recorded the time travelled by the sound. They performed the experiment at different temperatures at different times of the day.They recorded their findings in the … Read more