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Hello, My name is Mahmoud I'm in grade 10 it is my first year in Igcse and i am doing Biology , English , Math and Chemistry i had just realized that there is a forum and i see that it is so help full. I am doing exams till 21 may wish me good luck jajaja :D

I have forgot and answered the exam with pencil but i then realized and wrote on the pencil with a pen is there any problem with that?? + I want to check the answer of the question in the first exercise : -Why the tubing was rinsed with water before carrying out the experiment?